Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (229.405 of this chapter) is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [X]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes [ ] No [X]

State the aggregate market value of the voting and non-voting partnership interests held by non-affiliates computed by reference to the price at which the partnership interests were last sold, or the average bid and asked price of such partnership interests as of the last business day of the registrant’s most recently completed second fiscal quarter.  No market exists for the limited partnership interests of the Registrant, and, therefore, no aggregate market value can be determined.

DOCUMENTS INCORPORATED BY REFERENCE

FORWARD-LOOKING STATEMENTS

PART I

Item 1.     Business

National Property Investors 6 (the "Partnership" or "Registrant") is a California limited partnership formed on October 15, 1982.  The Partnership is engaged in the business of operating and holding real estate properties for investment. NPI Equity Investments, Inc., a Florida corporation, became the Partnership's managing general partner (the "Managing General Partner" or "NPI Equity") on June 21, 1991. The Managing General Partner is a subsidiary of Apartment Investment and Management Company ("Aimco"), a publicly traded real estate investment trust. The Partnership Agreement provides that the Partnership is to terminate on December 31, 2022, unless terminated prior to such date.

The Partnership, through its public offering of limited partnership units, sold 109,600 units aggregating $54,800,000.  The general partner contributed capital in the amount of $1,000 for a 1% interest in the Partnership. Since its initial offering, the Partnership has not received, nor are limited partners required to make, additional capital contributions. The Partnership currently owns and operates one apartment complex located in Maryland.

The Partnership has no full time employees.  Management and administrative services are provided by the Managing General Partner and by agents retained by the Managing General Partner. An affiliate of the Managing General Partner provided such property management services for the years ended December 31, 2013 and 2012.

A further description of the Partnership's business is included in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" included in this Form 10-K.

Item 1A.    Risk Factors

Not applicable.

Item 2.     Property

The following table sets forth the Partnership's investment in property:

Schedule of Property

Set forth below for the Partnership's investment property is the gross carrying value, accumulated depreciation, depreciable life, method of depreciation and Federal tax basis.

See "Note A – Organization and Summary of Significant Accounting Policies" to the financial statements included in "Item 8. Financial Statements and Supplementary Data" for a description of the Partnership's depreciation and capitalization policies.

Schedule of Property Indebtedness

The following table sets forth certain information relating to the loans encumbering the Partnership's property.

(1)   See “Note B - Mortgage Notes Payable” to the financial statements included in "Item 8. Financial Statements and Supplementary Data" for information with respect to the Partnership's ability to prepay the loans and other specific details about the loans.

Schedule of Rental Rates and Occupancy

Average annual rental rates and occupancy for 2013 and 2012 for the property were as follows:

The real estate industry is highly competitive. The Partnership’s property is subject to competition from other residential apartment complexes in the area. The Managing General Partner believes that the property is adequately insured. The property is an apartment complex which leases units for terms of one year or less.  No tenant leases 10% or more of the available rental space. The property is in good physical condition, subject to normal depreciation and deterioration as is typical for an asset of this type and age.

Schedule of Real Estate Taxes and Rate

Real estate taxes and rate in 2013 for the property were as follows:

(1)   Property’s tax year is not on a calendar year basis.

Capital Improvements

During the year ended December 31, 2013, the Partnership completed approximately $672,000 of capital improvements at Colony at Kenilworth Apartments, consisting primarily of building improvements, retaining wall and parking lot improvements, air conditioning, plumbing and electrical upgrades and appliance and floor covering replacements.  These improvements were funded from operating cash flow. The Partnership regularly evaluates the capital improvement needs of the property. While the Partnership has no material commitments for property improvements and replacements, certain routine capital expenditures are anticipated during 2014. Such capital expenditures will depend on the physical condition of the property as well as anticipated cash flow generated by the property.

Capital expenditures will be incurred only if cash is available from operations, Partnership reserves or advances from AIMCO Properties, L.P., although AIMCO Properties, L.P. does not have an obligation to fund such advances.  To the extent that capital improvements are completed, the Partnership's distributable cash flow, if any, may be adversely affected at least in the short term.

None.

Item 4.     Mine Safety Disclosures

Not applicable.

PART II

Item 5.     Market for the Registrant’s Common Equity, Related Security Holder Matters and Issuer Purchases of Equity Securities

The Partnership, a publicly-held limited partnership, offered and sold 109,600 Limited Partnership Units (the “Units”) aggregating $54,800,000. As of December 31, 2013, the Partnership had 109,496 Units outstanding held by 1,882 limited partners of record. Affiliates of the Managing General Partner owned 76,622 Units or 69.98% at December 31, 2013. No public trading market has developed for the Units, and it is not anticipated that such a market will develop in the future.

There were no distributions made by the Partnership during the years ended December 31, 2013 and 2012. Future cash distributions will depend on the levels of cash generated from operations and the timing of the debt maturities, property sale and/or refinancings. The Partnership's cash available for distribution is reviewed on a monthly basis. In light of the significant amounts accrued and payable to affiliates of the Managing General Partner at December 31, 2013, there can be no assurance that the Partnership will generate sufficient funds from operations, after planned capital expenditures and repayment of amounts due to affiliates, to permit any distributions to its partners in 2014 or subsequent periods. See “Item 2. Property – Capital Improvements” for information relating to anticipated capital expenditures at the property.

In addition to its indirect ownership of the Managing General Partner interest in the Partnership, Aimco and its affiliates owned 76,622 Units in the Partnership representing 69.98% of the outstanding Units at December 31, 2013. A number of these Units were acquired pursuant to tender offers made by Aimco or its affiliates. It is possible that Aimco or its affiliates will acquire additional Units in exchange for cash or a combination of cash and units in AIMCO Properties, L.P., the operating partnership of Aimco, either through private purchases or tender offers. Pursuant to the Partnership Agreement, Unit holders holding a majority of the Units are entitled to take action with respect to a variety of matters that include, but are not limited to, voting on certain amendments to the Partnership Agreement and voting to remove the Managing General Partner. As a result of its ownership of 69.98% of the outstanding Units, Aimco and its affiliates are in a position to influence all such voting decisions with respect to the Partnership. However, with respect to the 46,289 Units acquired on January 19, 1996, AIMCO IPLP, L.P. ("IPLP"), an affiliate of the Managing General Partner and of Aimco, agreed to vote such Units: (i) against any increase in compensation payable to the Managing General Partner or to its affiliates; and (ii) on all other matters submitted by it or its affiliates, in proportion to the vote cast by third party unitholders.  Except for the foregoing, no other limitations are imposed on IPLP's, Aimco's or any other affiliates' right to vote each Unit held. Although the Managing General Partner owes fiduciary duties to the limited partners of the Partnership, the Managing General Partner also owes fiduciary duties to Aimco as its sole stockholder. As a result, the duties of the Managing General Partner, as Managing General Partner, to the Partnership and its limited partners may come into conflict with the duties of the Managing General Partner to Aimco as its sole stockholder.

Item 6.     Selected Financial Data

Not applicable.

Item 7.     Management's Discussion and Analysis of Financial Condition and Results of Operations

This item should be read in conjunction with the financial statements and other items contained elsewhere in this report.

The Partnership’s financial results depend upon a number of factors including the ability to attract and maintain residents at the investment property, interest rates on mortgage loans, costs incurred to operate the investment property, general economic conditions and weather. As part of the ongoing business plan of the Partnership, the Managing General Partner monitors the rental market environment of its investment property to assess the feasibility of increasing rents, maintaining or increasing occupancy levels and protecting the Partnership from increases in expenses.  As part of this plan, the Managing General Partner attempts to protect the Partnership from the burden of inflation-related increases in expenses by increasing rents and maintaining a high overall occupancy level. However, the Managing General Partner may use rental concessions and rental rate reductions to offset softening market conditions; accordingly, there is no guarantee that the Managing General Partner will be able to sustain such a plan. Further, a number of factors that are outside the control of the Partnership such as the local economic climate and weather can adversely or positively affect the Partnership’s financial results.

Results of Operations

The Partnership’s net loss for the years ended December 31, 2013 and 2012 was approximately $1,423,000 and $1,648,000, respectively. The decrease in net loss is due to an increase in total revenues and a decrease in total expenses.

Total revenues increased primarily due to an increase in rental income. Other income remained relatively constant for the comparable periods. Rental income increased due to an increase in the average rental rate and a decrease in bad debt expense, partially offset by a slight decrease in occupancy.

Total expenses decreased due to decreases in operating and depreciation expenses, partially offset by increases in interest and property tax expenses.  General and administrative expenses remained relatively constant for the comparable periods. Operating expenses decreased due to decreases in contract services and turnover costs, partially offset by increases in eviction costs and maintenance expenses associated with numerous water leaks at the Partnership’s investment property. Depreciation expense decreased due to assets becoming fully depreciated during 2013. Interest expense increased due to an increase in interest on advances from an affiliate of the Managing General Partner as a result of a higher average outstanding advance balance, partially offset by a decrease in mortgage interest as a result of scheduled payments made on the mortgages encumbering the Partnership’s investment property, which reduced the carrying value of the mortgages.  Property tax expense increased due to an increase in the property tax rate and an increase in personal property taxes.

Included in general and administrative expenses for the years ended December 31, 2013 and 2012 are management reimbursements to the Managing General Partner as allowed under the Partnership Agreement, costs associated with the quarterly and annual communications with investors and regulatory agencies and the annual audit required by the Partnership Agreement.

Liquidity and Capital Resources

At December 31, 2013, the Partnership had cash and cash equivalents of approximately $261,000, compared to approximately $789,000 at December 31, 2012.  Cash and cash equivalents decreased approximately $528,000 due to approximately $1,128,000 of cash used in investing activities, partially offset by approximately $459,000 and $141,000 of cash provided by operating and financing activities, respectively.  Cash used in investing activities consisted of property improvements and replacements.  Cash provided by financing activities consisted of advances received from AIMCO Properties, L.P., partially offset by principal payments made on the mortgages encumbering the Partnership’s investment property.

The Partnership may receive advances of funds from AIMCO Properties, L.P., an affiliate of the Managing General Partner and the holder of a majority of the beneficial interest of the Partnership. During the year ended December 31, 2013, AIMCO Properties, L.P. advanced the Partnership approximately $525,000 to fund real estate taxes at the Partnership’s investment property. During the year ended December 31, 2012, AIMCO Properties, L.P. advanced the Partnership approximately $1,328,000 to fund operations at the Partnership and real estate taxes, capital improvements and operations at the Partnership’s investment property. The advances bear interest at the prime rate plus 2% (5.25% at December 31, 2013) per annum. Interest expense was approximately $534,000 and $444,000 for the years ended December 31, 2013 and 2012, respectively. At December 31, 2013 and 2012, the total advances and accrued interest owed to AIMCO Properties, L.P. was approximately $10,775,000 and $9,716,000, respectively, and is included in due to affiliates. The Partnership may receive additional advances of funds from AIMCO Properties, L.P. although AIMCO Properties, L.P. is not obligated to provide such advances.  For more information on AIMCO Properties, L.P., including copies of its audited balance sheet, please see its reports filed with the Securities and Exchange Commission.

The sufficiency of existing liquid assets to meet future liquidity and capital expenditure requirements is directly related to the level of capital expenditures required at the investment property to adequately maintain the physical asset and other operating needs of the Partnership and to comply with Federal, state, and local legal and regulatory requirements. The Managing General Partner monitors developments in the area of legal and regulatory compliance. The Partnership regularly evaluates the capital improvement needs of the property. While the Partnership has no material commitments for property improvements and replacements, certain routine capital expenditures are anticipated during 2014. Such capital expenditures will depend on the physical condition of the property as well as anticipated cash flow generated by the property. Capital expenditures will be incurred only if cash is available from operations, Partnership reserves or advances from AIMCO Properties, L.P., although AIMCO Properties, L.P. does not have an obligation to fund such advances. To the extent that capital improvements are completed, the Partnership's distributable cash flow, if any, may be adversely affected at least in the short term.

The Partnership’s assets are thought to be generally sufficient for any near-term needs (exclusive of capital improvements and repayment of advances from affiliates). If cash flows are insufficient for the Partnership to meet its current obligations, the Partnership may request additional advances of funds from AIMCO Properties, L.P., although AIMCO Properties, L.P. is not obligated to provide such advances. The mortgage indebtedness encumbering Colony at Kenilworth Apartments of approximately $23,048,000 matures in July 2019 and July 2021, at which time balloon payments of approximately $10,415,000 and $9,451,000, respectively, will be due.  The Managing General Partner will attempt to refinance such indebtedness and/or sell the property prior to such maturity dates.  If the property cannot be refinanced or sold for a sufficient amount, the Partnership will risk losing such property through foreclosure.

There were no distributions made by the Partnership during the years ended December 31, 2013 and 2012. Future cash distributions will depend on the levels of cash generated from operations and the timing of the debt maturities, property sale and/or refinancings. The Partnership's cash available for distribution is reviewed on a monthly basis. In light of the significant amounts accrued and payable to affiliates of the Managing General Partner at December 31, 2013, there can be no assurance that the Partnership will generate sufficient funds from operations, after planned capital expenditures and repayment of amounts due to affiliates, to permit any distributions to its partners in 2014 or subsequent periods.

Critical Accounting Policies and Estimates

A summary of the Partnership’s significant accounting policies is included in "Note A – Organization and Summary of Significant Accounting Policies" which is included in the financial statements in "Item 8. Financial Statements and Supplementary Data". The Managing General Partner believes that the consistent application of these policies enables the Partnership to provide readers of the financial statements with useful and reliable information about the Partnership’s operating results and financial condition.  The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires the Partnership to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities at the date of the financial statements as well as reported amounts of revenues and expenses during the reporting period.  Actual results could differ from these estimates. Judgments and assessments of uncertainties are required in applying the Partnership’s accounting policies in many areas. The Partnership believes that of its significant accounting policies, the following may involve a higher degree of judgment and complexity.

Impairment of Long-Lived Asset

Investment property is recorded at cost, less accumulated depreciation, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of the property may not be recoverable, the Partnership will make an assessment of its recoverability by comparing the carrying amount to the Partnership’s estimate of the undiscounted future cash flows, excluding interest charges, of the property. If the carrying amount exceeds the estimated aggregate undiscounted future cash flows, the Partnership would recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the property.

Real property investment is subject to varying degrees of risk.  Several factors may adversely affect the economic performance and value of the Partnership’s investment property.  These factors include, but are not limited to, general economic climate; competition from other apartment communities and other housing options; local conditions, such as loss of jobs or an increase in the supply of apartments that might adversely affect apartment occupancy or rental rates; changes in governmental regulations and the related cost of compliance; increases in operating costs (including real estate taxes) due to inflation and other factors, which may not be offset by increased rents; changes in tax laws and housing laws, including the enactment of rent control laws or other laws regulating multi-family housing; and changes in interest rates and the availability of financing.  Any adverse changes in these and other factors could cause an impairment of the Partnership’s asset.

Revenue Recognition

Item 7A.    Quantitative and Qualitative Disclosures About Market Risk

Not applicable.

Item 8.     Financial Statements and Supplementary Data

NATIONAL PROPERTY INVESTORS 6

LIST OF FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm

      Balance Sheets - December 31, 2013 and 2012

Statements of Operations - Years ended December 31, 2013 and 2012

Statements of Changes in Partners' Deficit - Years ended December 31, 2013 and 2012

Statements of Cash Flows - Years ended December 31, 2013 and 2012

Notes to Financial Statements

Report of Independent Registered Public Accounting Firm

The Partners

National Property Investors 6

We have audited the accompanying balance sheet of National Property Investors 6 as of December 31, 2013, and the related statements of operations, changes in partners' deficit, and cash flows for the year ended December 31, 2013. These financial statements are the responsibility of the Partnership's management. Our responsibility is to express an opinion on these financial statements based on our audit.

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of National Property Investors 6 at December 31, 2013, and the results of its operations and its cash flows for the year ended December 31, 2013, in conformity with U.S. generally accepted accounting principles.

/s/Carter & Company, CPA, LLC

Destin, Florida

March 31, 2014

Report of Independent Registered Public Accounting Firm

The Partners

National Property Investors 6

We have audited the accompanying balance sheet of National Property Investors 6 as of December 31, 2012, and the related statements of operations, changes in partners' deficit, and cash flows for the year ended December 31, 2012. These financial statements are the responsibility of the Partnership's management. Our responsibility is to express an opinion on these financial statements based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Partnership’s internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Partnership’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management and evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of National Property Investors 6 at December 31, 2012, and the results of its operations and its cash flows for the year ended December 31, 2012, in conformity with U.S. generally accepted accounting principles.

/s/ERNST & YOUNG LLP

Greenville, South Carolina

March 13, 2013

                                  See Accompanying Notes to Financial Statements

                        See Accompanying Notes to Financial Statements

Note A - Organization and Summary of Significant Accounting Policies

Organization

National Property Investors 6 (the "Partnership" or "Registrant") is a California limited partnership formed on October 15, 1982.  The Partnership is engaged in the business of operating and holding one apartment property located in Towson, Maryland for investment. NPI Equity Investments, Inc., a Florida corporation, became the Partnership's managing general partner (the "Managing General Partner" or "NPI Equity") on June 21, 1991. The Managing General Partner is a subsidiary of Apartment Investment and Management Company ("Aimco"), a publicly traded real estate investment trust. The partnership agreement provides that the Partnership is to terminate on December 31, 2022.

Subsequent Events

The Partnership’s management evaluated subsequent events through the time this Annual Report on Form 10-K was filed.

Reclassifications

Certain reclassifications have been made to the 2012 balances to conform to the 2013 presentation.  On the statements of cash flows, the bad debt expense for the year ended December 31, 2012 was reclassified to the change in receivables and deposits to conform with the presentation for the year ended December 31, 2013.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Abandoned Units

During the years ended December 31, 2013 and 2012, the number of limited partnership units (the “Units”) decreased by 28 and 36 Units, respectively, due to limited partners abandoning their Units.  In abandoning his or her Units, a limited partner relinquishes all right, title and interest in the Partnership as of the date of the abandonment.

Net Loss Per Limited Partnership Unit

At December 31, 2013 and 2012, the Partnership had outstanding 109,496 and 109,524 Units, respectively.  Net loss per Limited Partnership Unit is computed by dividing net loss allocated to the limited partners by the number of Units outstanding at the beginning of the fiscal year. The number of Units used was 109,524 and 109,560 Units for the years ended December 31, 2013 and 2012, respectively.

Allocation of Income, Loss and Distributions

Fair Value of Financial Statements

Financial Accounting Standards Board Accounting Standards Codification Topic 825, “Financial Instruments”, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate fair value. Fair value is defined as the amount at which the instruments could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale. The Partnership is required to classify these fair value measurements into one of three categories, based on the nature of the inputs used in the fair value measurement.  Level 1 of the hierarchy includes fair value measurements based on unadjusted quoted prices in active markets for identical assets or liabilities the Partnership can access at the measurement date. Level 2 includes fair value measurements based on inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.  Level 3 includes fair value measurements based on unobservable inputs.  The classification of fair value measurements is subjective and generally accepted accounting principles requires the Partnership to disclose more detailed information regarding those fair value measurements classified within the lower levels of the hierarchy.  The Partnership believes that the carrying amount of its financial instruments (except for mortgage notes payable) approximates their fair value due to the short-term maturity of these instruments. The Partnership estimates the fair value of its mortgage notes payable by discounting future cash flows using a discount rate commensurate with that currently believed to be available to the Partnership for similar term, mortgage notes payable. The Partnership has classified this fair value measurement within Level 2 of the fair value hierarchy. At December 31, 2013, the fair value of the Partnership's mortgage notes payable at the Partnership's incremental borrowing rate was approximately $25,107,000.

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand and cash in banks. At certain times, the amount of cash deposited at a bank may exceed the limit on insured deposits. Cash balances included approximately $261,000 and $789,000 at December 31, 2013 and 2012, respectively, that are maintained by an affiliated management company on behalf of affiliated entities in cash concentration accounts.

Tenant Security Deposits

The Partnership requires security deposits from lessees for the duration of the lease and such deposits are included in receivables and deposits. The security deposits are refunded when the tenant vacates, provided the tenant has not damaged the space and is current on rental payments.

Depreciation

Depreciation is provided by the straight-line method over the estimated lives of the apartment property and related personal property. For Federal income tax purposes, the modified accelerated cost recovery method is used for depreciation of (1) real property over 27 1/2 years and (2) personal property additions over 5 years.

Deferred Costs

Leasing commissions and other direct costs incurred in connection with successful leasing efforts are deferred and amortized over the terms of the related leases.  Amortization of these costs is included in operating expenses.

Leases

The Partnership generally leases apartment units for twelve-month terms or less.  The Partnership will offer rental concessions during particularly slow months or in response to heavy competition from other similar complexes in the area. Rental income attributable to leases, net of any concessions, is recognized on a straight-line basis over the term of the lease.  The Partnership evaluates all accounts receivable from residents and establishes an allowance, after the application of security deposits, for accounts greater than 30 days past due on current residents and all receivables due from former residents.

Investment Property

Investment property consists of one apartment complex and is stated at cost, less accumulated depreciation, unless the carrying amount of the asset is not recoverable. The Partnership capitalizes costs incurred in connection with capital additions activities, including redevelopment and construction projects, other tangible property improvements and replacements of existing property components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with capital additions activities at the property level. The Partnership capitalizes interest, property taxes and insurance during periods in which redevelopment and construction projects are in progress. The Partnership did not capitalize any costs related to interest, property taxes or insurance during the years ended December 31, 2013 and 2012. Capitalized costs are depreciated over the estimated useful life of the asset. The Partnership charges to expense as incurred costs including ordinary repairs, maintenance and resident turnover costs.

If events or circumstances indicate that the carrying amount of the property may not be recoverable, the Partnership will make an assessment of its recoverability by comparing the carrying amount to the Partnership’s estimate of the undiscounted future cash flows, excluding interest charges, of the property.   If the carrying amount exceeds the estimated aggregate undiscounted future cash flows, the Partnership would recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the property. No adjustments for impairment of value were necessary for the years ending December 31, 2013 and 2012.

Segment Reporting

ASC Topic 280-10, “Segment Reporting”, established standards for the way that public business enterprises report information about operating segments in annual financial statements and requires that those enterprises report selected information about operating segments in interim financial reports. ASC Topic 280-10 also established standards for related disclosures about products and services, geographic areas, and major customers. As defined in ASC Topic 280-10, the Partnership has only one reportable segment.

Advertising Costs

Note B - Mortgage Notes Payable

The principal terms of mortgage notes payable are as follows:

The mortgage notes payable are fixed rate mortgages that are nonrecourse and are secured by pledge of the Partnership's investment property and by a pledge of revenue from the investment property. The mortgage notes payable include prepayment penalties if repaid prior to maturity. Further, the property may not be sold subject to existing indebtedness.

Scheduled principal payments of the mortgage notes payable subsequent to December 31, 2013 are as follows (in thousands):

Note C - Income Taxes

The Partnership is classified as a partnership for Federal income tax purposes. Accordingly, no provision for income taxes is made in the financial statements of the Partnership. Taxable income or loss of the Partnership is reported in the income tax returns of its partners.

The following is a reconciliation of reported net loss and Federal taxable (loss) income (in thousands, except per unit data):

For 2013 and 2012, allocations under the Internal Revenue Code section 704(b) resulted in the limited partners being allocated a non-pro rata amount of taxable loss or income.

The following is a reconciliation between the Partnership's reported amounts and Federal tax basis of net liabilities (in thousands):

Note D - Transactions with Affiliated Parties

The Partnership has no employees and depends on the Managing General Partner and its affiliates for the management and administration of all Partnership activities. The Partnership Agreement provides for certain payments to affiliates for services and as reimbursement of certain expenses incurred by affiliates on behalf of the Partnership. 

Affiliates of the Managing General Partner receive 5% of gross receipts from the Partnership's property as compensation for providing property management services. The Partnership paid to such affiliates approximately $247,000 and $238,000 for the years ended December 31, 2013 and 2012, respectively, which are included in operating expenses.

Affiliates of the Managing General Partner charged the Partnership for reimbursement of accountable administrative expenses amounting to approximately $139,000 and $174,000 for the years ended December 31, 2013 and 2012, respectively, which is included in general and administrative expenses and investment property.  The portion of these reimbursements included in investment property for the years ended December 31, 2013 and 2012 are construction management services provided by an affiliate of the Managing General Partner of approximately $103,000 and $126,000, respectively.  At December 31, 2013 and 2012, approximately $163,000 and $332,000, respectively, of reimbursements were due to the Managing General Partner and are included in due to affiliates.

For services relating to the administration of the Partnership and operation of the Partnership's property, the Managing General Partner is entitled to receive payment for non-accountable expenses up to a maximum of $150,000 per year, based upon the number of Partnership units sold, subject to certain limitations. No such reimbursements were made during the years ended December 31, 2013 or 2012.

As compensation for services rendered in managing the Partnership, the Managing General Partner is entitled to receive Partnership management fees in conjunction with distributions of cash from operations, subject to certain limitations. No such Partnership management fees were earned or paid during the years ended December 31, 2013 or 2012.

Upon the sale of the Partnership’s property, NPI Equity will be entitled to an Incentive Compensation Fee equal to 3% of the difference between the sales price of the property and the appraised value for such property at February 1, 1992. Payment of the Incentive Compensation Fee is subordinated to the receipt by the limited partners, of: (a) distributions from capital transaction proceeds of an amount equal to their appraised investment in the Partnership at February 1, 1992, and (b) distributions from all sources (capital transactions as well as cash flow) of an amount equal to six percent (6%) per annum cumulative, non-compounded, on their appraised investment in the Partnership at February 1, 1992. Prior to 2012, these preferences were met.

The Partnership insures its property up to certain limits through coverage provided by Aimco which is generally self-insured for a portion of losses and liabilities related to workers’ compensation, property casualty, general liability, and vehicle liability.  The Partnership insures its property above the Aimco limits through insurance policies obtained by Aimco from insurers unaffiliated with the Managing General Partner. During the years ended December 31, 2013 and 2012, the Partnership was charged by Aimco and its affiliates approximately $60,000 and $66,000, respectively, for insurance coverage and fees associated with policy claims administration.

 Note E – Investment Property and Accumulated Depreciation

Reconciliation of “Investment Property and Accumulated Depreciation” (in thousands):

The aggregate cost of the investment property for Federal income tax purposes at December 31, 2013 and 2012 is approximately $37,252,000 and $36,513,000, respectively. The accumulated depreciation taken for Federal income tax purposes at December 31, 2013 and 2012 is approximately $28,691,000 and $27,480,000, respectively.

Note F - Contingencies

The Partnership is unaware of any pending or outstanding litigation matters involving it or its investment property that are not of a routine nature arising in the ordinary course of business.

Various Federal, state and local laws subject property owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials present on a property, including lead-based paint, asbestos, polychlorinated biphenyls, petroleum-based fuels, and other miscellaneous materials. Such laws often impose liability without regard to whether the owner or operator knew of, or was responsible for, the release or presence of such materials. The presence of, or the failure to manage or remedy properly, these materials may adversely affect occupancy at affected apartment communities and the ability to sell or finance affected properties. In addition to the costs associated with investigation and remediation actions brought by government agencies, and potential fines or penalties imposed by such agencies in connection therewith, the improper management of these materials on a property could result in claims by private plaintiffs for personal injury, disease, disability or other infirmities. Various laws also impose liability for the cost of removal, remediation or disposal of these materials through a licensed disposal or treatment facility. Anyone who arranges for the disposal or treatment of these materials is potentially liable under such laws for the proper operation of the disposal facility. These laws often impose liability whether or not the person arranging for the disposal ever owned or operated the disposal facility. In connection with the ownership, operation and management of its property, the Partnership could potentially be responsible for environmental liabilities or costs associated with its property. 

Item 9.     Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

Effective January 9, 2014, the Registrant dismissed its prior independent registered public accounting firm, Ernst & Young LLP and retained as its new independent registered public accounting firm, Carter & Company, CPA, LLC.  The reports of Ernst & Young LLP on the financial statements of the Registrant as of and for the years ended December 31, 2012 and 2011 did not contain any adverse opinion or disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope or accounting principles.  The decision to change independent accountants was approved by the board of directors of the Managing General Partner of the Partnership.  During the two fiscal years ended 2012 and through January 9, 2014, there were no disagreements with Ernst & Young LLP on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure which disagreements if not resolved to the satisfaction of Ernst & Young LLP, would have caused it to make reference to the subject matter of the disagreements in connection with its reports on the Partnership’s financial statements for the fiscal years ended December 31, 2012 and 2011.

Effective January 9, 2014, the Registrant engaged Carter & Company, CPA, LLC as its independent registered public accounting firm.  During the Partnership’s two fiscal years ended December 31, 2012 and the subsequent interim period through January 9, 2014, the Registrant did not consult with Carter and Company, CPA, LLC with respect to the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Partnership’s financial statements, or any other matters or reportable events as set forth in Items 304(a)(2) of Regulation S-K.

Item 9A.    Controls and Procedures

The Partnership’s management assessed the effectiveness of the Partnership’s internal control over financial reporting as of December 31, 2013.  In making this assessment, the Partnership’s management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework.

Based on their assessment, the Partnership’s management concluded that, as of December 31, 2013, the Partnership’s internal control over financial reporting is effective.

This annual report does not include an attestation report of the Partnership’s registered public accounting firm regarding internal control over financial reporting.  Management’s report was not subject to attestation by the Partnership’s registered public accounting firm pursuant to rules of the Securities and Exchange Commission that permit the Partnership to provide only management’s report in this annual report.

John Bezzant was appointed as a Director of the Managing General Partner effective December 16, 2009.  Mr. Bezzant was appointed Executive Vice President of the Managing General Partner and Aimco in January 2011 and prior to that time was a Senior Vice President of the Managing General Partner and Aimco since joining Aimco in June 2006.  Prior to joining Aimco, Mr. Bezzant spent over 20 years with Prologis, Inc. and Catellus Development Corporation in a variety of executive positions, including those with responsibility for transactions, fund management, asset management, leasing and operations.  Mr. Bezzant brings particular expertise to the Board in the areas of real estate finance, property operations, sales and development.

Ernest M. Freedman was appointed Executive Vice President and Chief Financial Officer of the Managing General Partner and Aimco in November 2009.   Mr. Freedman joined Aimco in 2007 as Senior Vice President of Financial Planning and Analysis and served as Senior Vice President of Finance from February 2009 to November 2009, responsible for financial planning, tax, accounting and related areas.  Prior to joining Aimco, from 2004 to 2007, Mr. Freedman served as chief financial officer of HEI Hotels and Resorts.

Lisa R. Cohn was appointed Executive Vice President, General Counsel and Secretary of the Managing General Partner and Aimco in December 2007.  From January 2004 to December 2007, Ms. Cohn served as Senior Vice President and Assistant General Counsel of Aimco.  Ms. Cohn joined Aimco in July 2002 as Vice President and Assistant General Counsel.  Prior to joining Aimco, Ms. Cohn was in private practice with the law firm of Hogan and Hartson LLP.

Paul Beldin joined Aimco in May 2008 and has served as Senior Vice President and Chief Accounting Officer of Aimco and the Managing General Partner since that time.  Prior to joining Aimco, Mr. Beldin served as controller and then as chief financial officer of America First Apartment Investors, Inc., a publicly traded multifamily real estate investment trust, from May 2005 to September 2007 when the company was acquired by Sentinel Real Estate Corporation.  Prior to joining America First Apartment Investors, Inc., Mr. Beldin was a senior manager at Deloitte and Touche LLP, where he was employed from August 1996 to May 2005, including two years as an audit manager in SEC services at Deloitte’s national office.

Stephen B. Waters was appointed Senior Director of Partnership Accounting of Aimco and the Managing General Partner in June 2009.  Mr. Waters has responsibility for partnership accounting with Aimco and serves as the equivalent of the principal financial officer of the Partnership.  Mr. Waters joined Aimco as a Director of Real Estate Accounting in September 1999 and was appointed Vice President of the Managing General Partner and Aimco in April 2004.  Prior to joining Aimco, Mr. Waters was a senior manager at Ernst & Young LLP.

The Registrant is not aware of the involvement in any legal proceedings with respect to the directors and executive officers listed in this Item 10.

One or more of the above persons are also directors and/or officers of a general partner (or general partner of a general partner) of limited partnerships which either have a class of securities registered pursuant to Section 12(g) of the Securities Exchange Act of 1934, or are subject to the reporting requirements of Section 15(d) of such Act. Further, one or more of the above persons are also officers of Apartment Investment and Management Company and the general partner of AIMCO Properties, L.P., entities that have a class of securities registered pursuant to Section 12(g) of the Securities Exchange Act of 1934, or are subject to the reporting requirements of Section 15 (d) of such Act.

The board of directors of the Managing General Partner does not have a separate audit committee. As such, the board of directors of the Managing General Partner fulfills the functions of an audit committee. The board of directors has determined that Steven D. Cordes meets the requirement of an "audit committee financial expert".

The directors and officers of the Managing General Partner with authority over the Partnership are all employees of subsidiaries of Aimco. Aimco has adopted a code of ethics that applies to such directors and officers that is posted on Aimco's website (www.Aimco.com). Aimco's website is not incorporated by reference to this filing.

Item 11.    Executive Compensation

No directors or officers of the Managing General Partner received any remuneration from the Partnership during the year ended December 31, 2013.

Item 12.    Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Except as noted below, as of December 31, 2013, no person or entity was known to own of record or beneficially more than five percent of the limited partnership units (the “Units”) of the Partnership.

AIMCO IPLP, L.P. is indirectly ultimately owned by Aimco. Its business address is 80 International Drive, Greenville, SC 29615.

AIMCO Properties, L.P. is indirectly ultimately controlled by Aimco. Its business address is 4582 S. Ulster St. Parkway, Suite 1100, Denver, Colorado 80237.

No director or officer of the Managing General Partner owns any Units.

Item 13.    Certain Relationships and Related Transactions, and Director Independence

The Partnership has no employees and depends on the Managing General Partner and its affiliates for the management and administration of all Partnership activities. The Partnership Agreement provides for certain payments to affiliates for services and as reimbursement of certain expenses incurred by affiliates on behalf of the Partnership.

Affiliates of the Managing General Partner receive 5% of gross receipts from the Partnership's property as compensation for providing property management services. The Partnership paid to such affiliates approximately $247,000 and $238,000 for the years ended December 31, 2013 and 2012, respectively, which are included in operating expense.

For services relating to the administration of the Partnership and operation of the Partnership's property, the Managing General Partner is entitled to receive payment for non-accountable expenses up to a maximum of $150,000 per year based upon the number of Partnership units sold, subject to certain limitations. No such reimbursements were made during the years ended December 31, 2013 or 2012.

As compensation for services rendered in managing the Partnership, the Managing General Partner is entitled to receive Partnership management fees in conjunction with distributions of cash from operations, subject to certain limitations. No such Partnership management fees were earned or paid during the years ended December 31, 2013 or 2012.

The Partnership may receive advances of funds from AIMCO Properties, L.P., an affiliate of the Managing General Partner and the holder of a majority of the beneficial interest of the Partnership. During the year ended December 31, 2013, AIMCO Properties, L.P. advanced the Partnership approximately $525,000 to fund real estate taxes at the Partnership’s investment property.  During the year ended December 31, 2012, AIMCO Properties, L.P. advanced the Partnership approximately $1,328,000 to fund operations at the Partnership and real estate taxes, capital improvements and operations at the Partnership’s investment property. The advances bear interest at the prime rate plus 2% (5.25% at December 31, 2013) per annum. Interest expense was approximately $534,000 and $444,000 for the years ended December 31, 2013 and 2012, respectively. At December 31, 2013 and 2012, the total advances and accrued interest owed to AIMCO Properties, L.P. was approximately $10,775,000 and $9,716,000, respectively, and is included in due to affiliates. The Partnership may receive additional advances of funds from AIMCO Properties, L.P. although AIMCO Properties, L.P. is not obligated to provide such advances.  For more information on AIMCO Properties, L.P., including copies of its audited balance sheet, please see its reports filed with the Securities and Exchange Commission.

Upon the sale of the Partnership’s property, NPI Equity will be entitled to an Incentive Compensation Fee equal to 3% of the difference between the sales price of the property and the appraised value for such property at February 1, 1992. Payment of the Incentive Compensation Fee is subordinated to the receipt by the limited partners, of: (a) distributions from capital transaction proceeds of an amount equal to their appraised investment in the Partnership at February 1, 1992, and (b) distributions from all sources (capital transactions as well as cash flow) of an amount equal to six percent (6%) per annum cumulative, non-compounded, on their appraised investment in the Partnership at February 1, 1992. Prior to 2012, these preferences were met.

The Partnership insures its property up to certain limits through coverage provided by Aimco which is generally self-insured for a portion of losses and liabilities related to workers’ compensation, property casualty, general liability and vehicle liability. The Partnership insures its property above the Aimco limits through insurance policies obtained by Aimco from insurers unaffiliated with the Managing General Partner. During the years ended December 31, 2013 and 2012, the Partnership was charged by Aimco and its affiliates approximately $60,000 and $66,000, respectively, for insurance coverage and fees associated with policy claims administration.

Neither of the Managing General Partner's directors is independent under the independence standards established for New York Stock Exchange listed companies as both directors are employed by the parent of the Managing General Partner.

Item 14.    Principal Accounting Fees and Services

Ernst & Young LLP was previously the independent registered public accounting firm for the Partnership.  On January 9, 2014, that firm was dismissed and Carter & Company, CPA, LLC was engaged as independent auditors for the year ended December 31, 2013.  The Managing General Partner has reappointed Carter & Company, CPA, LLC as independent auditors to audit the financial statements of the Partnership for 2014.  The aggregate fees billed for services rendered for 2013 and 2012 are described below.

Audit Fees.  Fees for audit services totaled approximately $50,000 and $43,000 for 2013 and 2012, respectively.  Fees for audit services also include fees for the reviews of the Partnership’s Quarterly Reports on Form 10-Q.

Tax Fees.  Fees for tax services totaled approximately $6,000 for both 2013 and 2012.

PART IV

Item 15.  Exhibits, Financial Statement Schedules

(a)   The following financial statements of the Registrant are included in Item 8:

Balance Sheets at December 31, 2013 and 2012.

Statements of Operations for the years ended December 31, 2013 and 2012.

Statements of Cash Flows for the years ended December 31, 2013 and 2012.

Notes to Financial Statements.

Schedules are omitted for the reason that they are inapplicable or equivalent information has been included elsewhere herein.

(b)   Exhibits:

      See Exhibit index.

The agreements included as exhibits to this Form 10-K contain representations and warranties by each of the parties to the applicable agreement. These representations and warranties have been made solely for the benefit of the other parties to the applicable agreement and:

• should not in all instances be treated as categorical statements of fact, but rather as a way of allocating the risk to one of the parties if those statements prove to be inaccurate;

• have been qualified by disclosures that were made to the other party in connection with the negotiation of the applicable agreement, which disclosures are not necessarily reflected in the agreement;

• may apply standards of materiality in a way that is different from what may be viewed as material to an investor; and

• were made only as of the date of the applicable agreement or such other date or dates as may be specified in the agreement and are subject to more recent developments.

Accordingly, these representations and warranties may not describe the actual state of affairs as of the date they were made or at any other time. The Partnership acknowledges that, notwithstanding the inclusion of the foregoing cautionary statements, it is responsible for considering whether additional specific disclosures of material information regarding material contractual provisions are required to make the statements in this Form 10-K not misleading. Additional information about the Partnership may be found elsewhere in this Form 10-K and the Partnership’s other public filings, which are available without charge through the SEC’s website at http://www.sec.gov.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

NATIONAL PROPERTY INVESTORS 6

EXHIBIT INDEX

Exhibit          Description of Exhibit

2.1             NPI, Inc. Stock Purchase Agreement dated as of August 17, 1995, incorporated by reference to Exhibit 2 to the Partnership's Current Report on Form 8-K dated August 17, 1995.

 2.2             Partnership Units Purchase Agreement dated as of August 17, 1995, incorporated by reference to Exhibit 2.1 to Form 8-K filed by Insignia Financial Group, Inc. with the Securities and Exchange Commission on September 1, 1995.

 2.3             Management Purchase Agreement dated as of August 17, 1995, incorporated by reference to Exhibit 2.2 to Form 8-K filed by Insignia Financial Group, Inc. with the Securities and Exchange Commission on September 1, 1995.

 3.4 (a)         Agreement of Limited Partnership, incorporated by reference to Exhibit A to the Prospectus of the Partnership dated January 12, 1983, included in the Partnership's Registration Statement on Form S-11 (Reg. No. 2-80141).

     (b)         Amendments to Agreement of Limited Partnership, incorporated by reference to the Definitive Proxy Statement of the Partnership dated April 3, 1991.

     (c)         Amendments to the Partnership Agreement, incorporated by reference to the Statement Furnished in Connection with the Solicitation of the Registrant dated August 28, 1992.

10.36            Multifamily Note dated August 31, 2007 between National Property Investors 6, a California limited partnership, and Capmark Bank, a Utah industrial bank. (Incorporated by reference to the Partnership’s Current Report on Form 8-K dated August 31, 2007.)

10.37            Amended and Restated Multifamily Note dated August 31, 2007 between National Property Investors 6, a California limited partnership, and Federal Home Loan Mortgage Corporation. (Incorporated by reference to the Partnership’s Current Report on Form 8-K dated August 31, 2007.)

16.1             Letter dated January 14, 2014 from Ernst & Young LLP. (Incorporated by reference to the Partnership’s Current Report on Form 8-K dated January 9, 2014.)

31.1             Certification of equivalent of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2            Certification of equivalent of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1             Certification of equivalent of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101              XBRL (Extensible Business Reporting Language). The following materials from National Property Investors 6’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013, formatted in XBRL: (i) balance sheets, (ii) statements of operations, (iii) statements of changes in partners’ deficit, (iv) statements of cash flows, and (v) notes to financial statements (1).

(1)              As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.