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United States

Securities and Exchange Commission

Washington, D.C. 20549

FORM 10-K

Annual Report Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

AmSouth Bancorporation

(Exact Name of registrant as specified in its charter)

Registrant’s telephone number, including area code (205) 320-7151

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:    None

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.            Yes x            No ¨

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 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. ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act). Yes x            No ¨

The aggregate market value of the common equity held by nonaffiliates of the registrant as of June 30, 2004 (the last business day of AmSouth Bancorporation’s most recently completed second fiscal quarter) was $8,731,260,531 (Note 1)

As of February 22, 2005, AmSouth Bancorporation had 353,133,277 shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the following documents are incorporated by reference herein:

Annual Report to Shareholders for the year ended December 31, 2004: Part I, Part II

Proxy Statement for Annual Meeting to be held April 21, 2005: Part III

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Note 1:    In calculating the market value of the common equity held by nonaffiliates of AmSouth as disclosed on the cover page of this Form 10-K, AmSouth has treated as common equity held by affiliates only voting stock owned as of June 30, 2004 by its directors and principal executive officers and voting stock held by AmSouth’s employee benefit plans; AmSouth has not treated for purposes of this response stock held by any of AmSouth’s subsidiaries as pledgee or in a fiduciary capacity as stock held by affiliates of AmSouth. AmSouth had no nonvoting common equity outstanding at June 30, 2004. AmSouth’s response to this item is not intended to be an admission that any person is an affiliate of AmSouth for any purpose other than this response.

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AMSOUTH BANCORPORATION

Form 10-K

INDEX

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PART I

General

AmSouth Bancorporation (AmSouth or the Company) is a financial holding company and bank holding company, which was organized in 1970 as a Delaware corporation and began doing business in 1972. AmSouth offers a broad range of bank and bank-related services through its principal subsidiary, AmSouth Bank (the Bank), and its other subsidiaries. At December 31, 2004, AmSouth had total consolidated assets of approximately $50 billion.

The Bank is an Alabama banking corporation and a wholly owned subsidiary of AmSouth. As of December 31, 2004, the Bank had total consolidated assets of approximately $49.7 billion and total consolidated deposits of approximately $34.8 billion. As of December 31, 2004, the assets of the Bank constituted virtually all of the assets of AmSouth.

AmSouth has three reportable segments: Consumer Banking, Commercial Banking and Wealth Management. Consumer Banking delivers a full range of financial services to individuals and small businesses, including loan products such as residential mortgages, equity lending, credit cards, and loans for automobile and other personal financing needs, and various products designed to meet the credit needs of small businesses. Consumer Banking also offers various deposit products to meet customers’ savings and transaction needs. Commercial Banking meets the requirements of corporate and middle market customers with a comprehensive array of credit, treasury management, international and capital markets services. Included among these are several specialty services such as real estate finance, asset based lending and commercial leasing. Wealth Management is comprised of trust, institutional, retirement, private client services and broker-dealer services. This area includes traditional trust services as well as a substantial selection of investment management services.

These services are offered to businesses and individuals through the Bank’s approximately 685 offices located in Alabama, Florida, Tennessee, Mississippi, Louisiana and Georgia. In addition to these offices, the Bank operates a network of more than 1,250 automated teller machines that are linked with shared automated tellers in all 50 states. Further segment information is included in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Note 20 of the Notes to Consolidated Financial Statements, both of which are incorporated herein by reference pursuant to Items 7 and 8 of this Form 10-K.

As of December 31, 2004, AmSouth and its subsidiaries had approximately 12,000 full-time equivalent employees.

Competition

AmSouth’s subsidiaries compete aggressively with banks located in Alabama, Florida, Tennessee, Mississippi, Louisiana and Georgia, as well as large banks in major financial centers, and with other financial institutions, such as savings and loan associations, credit unions, consumer finance companies, brokerage firms, insurance companies, investment companies, mortgage companies, and financial service operations of major retailers, including automotive retailers. Competition is based on a number of factors, including prices, interest rates, services, and availability of products. At December 31, 2004, AmSouth was the 18th largest bank holding company headquartered in the United States based on total assets.

Business Combinations

AmSouth continually evaluates business combination opportunities and sometimes conducts due diligence activities in connection with them. As a result, business combination discussions and, in some cases, negotiations take place, and transactions involving cash, debt or equity securities can be expected. Any future business combination or series of business combinations that AmSouth might undertake may be material, in terms of assets acquired or liabilities assumed, to AmSouth’s financial condition. Business combinations in the banking industry have historically involved the payment of a premium over book and market values. This practice may result in dilution of book value and net income per share for the acquirers.

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Supervision and Regulation

The following discussion addresses the regulatory framework applicable to financial holding companies, bank holding companies and their subsidiaries, and provides certain specific information relevant to AmSouth. Regulation of financial institutions such as AmSouth and its subsidiaries is intended primarily for the protection of depositors, the deposit insurance funds of the Federal Deposit Insurance Corporation (the FDIC) and the banking system as a whole, and generally is not intended for the protection of stockholders or other investors.

The following is a summary of certain statutes and regulations that apply to the operation of banking institutions. Changes in the applicable laws, and in their application by regulatory and law enforcement agencies, cannot necessarily be predicted, but may have a material effect on the business and results of banking organizations, including AmSouth.

The current regulatory environment for financial institutions includes substantial enforcement activity by the federal banking agencies, the Justice Department, the Securities and Exchange Commission and other state and federal law enforcement agencies, reflecting an increase in activity over prior years. This environment entails significant potential increases in compliance requirements and associated costs. A number of banking institutions have recently been subject to enforcement actions as well as settlements involving, among other things, cease and desist orders, written agreements, deferred prosecutions and payments of monetary penalties.

General

As a financial holding company and bank holding company, AmSouth is subject to regulation and supervision by the Federal Reserve Board under the Bank Holding Company Act of 1956, as amended (the BHCA). A financial holding company may own insured depository institutions and engage through its non-bank affiliates in a broader range of financial activities than previously permissible for a bank holding company. These activities include underwriting securities, insurance underwriting, merchant banking and insurance company investments, in addition to any activity that the Federal Reserve Board determines by rule or order to be financial in nature or incidental to such financial activity. The Federal Reserve is responsible for “umbrella” supervision and examination of financial holding companies. Other federal and state regulators regulate, supervise and examine the “functionally regulated subsidiaries” such as insurance companies and broker-dealers.

The Bank is a state bank, chartered under the laws of Alabama, and is a member of the Federal Reserve System. It is generally subject to regulation and supervision by both the Federal Reserve Board and the Office of the Superintendent of Banking of the State of Alabama (the Superintendent). The Bank is also an insured depository institution and, therefore, subject to regulation by the FDIC. In addition, the Bank is subject to various requirements and restrictions under federal and state law, including requirements to maintain reserves against deposits, restrictions on the types and amounts of loans that may be granted and the interest that may be charged thereon, and limitations on the types of investments that may be made and on the types of services that may be offered. Various consumer laws and regulations also affect the operations of the Bank. In addition to the impact of regulation, commercial banks are affected significantly by the actions of the Federal Reserve Board as it attempts to control the money supply and credit availability in order to influence the economy.

The Bank’s subsidiaries are also subject to regulation, supervision and examination by other federal and state and self-regulatory agencies. For example, AmSouth Investment Services, Inc., a registered broker-dealer, is subject to the supervision of the Securities and Exchange Commission (SEC), the National Association of Securities Dealers (NASD), and state securities and insurance agencies. AmSouth Asset Management, Inc. and AmSouth Investment Management Company LLC, both investment advisers, are subject to regulation by the SEC in addition to state securities agencies.

In October 2004, AmSouth entered into a deferred prosecution agreement with the U.S. Attorney for the Southern District of Mississippi relating to deficiencies in the Bank’s reporting of suspicious activities under the Bank Secrecy Act. At the same time, AmSouth entered into a cease and desist order with the Federal Reserve and the Alabama Department of Banking, as well as an order with the Financial Crimes Enforcement Network, relating to AmSouth’s deficiencies in compliance with the Bank Secrecy Act. Provided that AmSouth complies with the obligations under the deferred prosecution agreement for a period of twelve months, the U.S. Attorney

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has agreed not to take further action against the Company in connection with this matter. The Federal Reserve has also indicated it will restrict the Company’s expansion activities, including the branch expansion program, until such time as it believes that AmSouth is in substantial compliance with the requirements of the cease and desist order. Pursuant to these agreements, AmSouth has taken additional actions to ensure compliance with the Bank Secrecy Act. Among other things, these actions include independent third party reviews of all of the Company’s activities related to compliance with the Bank Secrecy Act, enhanced training of personnel, submission of a revised compliance program, and the adoption of new policies and procedures.

Payment of Dividends

AmSouth is a legal entity separate and distinct from its banking and other subsidiaries. The principal source of cash flow for AmSouth, including funds used to pay dividends on AmSouth’s capital stock and interest and principal on any debt of AmSouth, is dividends from the Bank. There are statutory and regulatory limitations on the payment of dividends by the Bank to AmSouth as well as by AmSouth to its shareholders. The payment of dividends by AmSouth and the Bank also may be affected by other factors, such as the requirement to maintain capital at or above regulatory guidelines. See “Capital Adequacy and Related Matters” below.

Under Alabama law, a bank may not pay a dividend in excess of 90 percent of its net earnings until the bank’s surplus is equal to at least 20 percent of capital. The Bank is also required by Alabama law to obtain approval of the Superintendent prior to the payment of dividends if the total of all dividends declared by the Bank in any calendar year will exceed the total of (a) the Bank’s net earnings (as defined by statute) for that year, plus (b) its retained net earnings for the preceding two years, less any required transfers to surplus. Also, no dividends may be paid from the Bank’s surplus without the prior written approval of the Superintendent.

In addition, as a member of the Federal Reserve System, the Bank is required by federal law to obtain regulatory approval for the payment of dividends if the total of all dividends declared by the Board of Directors of the Bank in any year could exceed the total of (a) the Bank’s net income (as reportable in its Reports of Condition and Income) for that year, plus (b) the Bank’s retained net income (as defined and interpreted by regulation) for the preceding two years, less any net losses incurred in the current or prior two years and any required transfers to surplus or a fund for the retirement of preferred stock.

Furthermore, if, in the opinion of the applicable federal bank regulatory authority, a bank is engaged in or is about to engage in an unsafe or unsound practice (which, depending on the financial condition of the bank, could include the payment of dividends), such authority may require, after notice and a hearing, that such bank cease and desist from such practice. The Federal Reserve Board has indicated that paying dividends that deplete a bank’s capital base to an inadequate level would be an unsafe and unsound banking practice. In addition, the Federal Deposit Insurance Act (the FDI Act) imposes restrictions on the payments of dividends by the Bank, as described under “Capital Adequacy and Related Matters—Prompt Corrective Action” below. Moreover, the Federal Reserve Board has issued a policy statement that provides that bank holding companies and state member banks should generally pay dividends only out of current operating earnings.

Under dividend restrictions imposed under federal and Alabama law, including those described above, the Bank, without obtaining government approvals, could declare aggregate dividends in 2005 of an amount equal to $209 million plus its net income for 2005.

Capital Adequacy and Related Matters

Capital Guidelines

AmSouth is subject to risk-based capital guidelines adopted by the Federal Reserve Board. The minimum guideline for the ratio of total regulatory capital (Total Capital) to risk-weighted assets (including certain off-balance-sheet items, such as commitments to extend credit and standby letters of credit) is 8 percent. At least half of the Total Capital must be composed principally of common equity less goodwill and certain other intangible assets (Tier 1 Capital). The remainder may consist of subordinated debt and a limited amount of loan loss reserves. At December 31, 2004, AmSouth’s consolidated Tier 1 Capital and Total Capital ratios were 8.05 percent and 10.93 percent, respectively.

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In addition, the Federal Reserve Board has established minimum leverage ratio guidelines for bank holding companies. The guidelines provide for a minimum ratio of Tier 1 Capital to average assets, less goodwill and certain other intangible assets (the Leverage Ratio), of 3 percent for bank holding companies that meet certain specific criteria, including having the highest regulatory rating. All other bank holding companies generally are required to maintain a Leverage Ratio of at least 4 percent. AmSouth’s Leverage Ratio at December 31, 2004 was 6.73 percent. The guidelines also provide that bank holding companies experiencing internal growth or making acquisitions will be expected to maintain strong capital positions substantially above the minimum supervisory levels without significant reliance on intangible assets. Furthermore, the Federal Reserve Board has indicated that it will consider a “Tangible Tier 1 Capital Leverage Ratio” (deducting all intangibles) and other indicators of capital strength in evaluating proposals for expansion or new activities.

The Bank is also subject to risk-based and leverage capital requirements, similar to those described above. The Bank complied with applicable minimum capital requirements as of December 31, 2004. Neither AmSouth nor the Bank has been advised by any federal banking agency of any specific minimum Leverage Ratio requirement applicable to it.

Changes to the risk-based capital regime are frequently proposed or implemented. The minimum risk-based capital requirements adopted by the federal banking agencies follow the Capital Accord of the Basel Committee on Banking Supervision. The Basel Committee, which is comprised of bank supervisors and central banks from the major industrialized countries, issued its Capital Accord in 1988 to achieve convergence in the capital regulations applicable to internationally active banking organizations. The Basel Committee issued a proposed replacement for the Capital Accord in January 2001, and, subsequently, it issued a number of working papers supplementing various aspects of that replacement (the “New Accord”). Based on these documents, the New Accord would adopt a three-pillar framework for addressing capital adequacy. These pillars would include minimum capital requirements, more emphasis on supervisory assessment of capital adequacy and greater reliance on market discipline. Under the New Accord, minimum capital requirements would be more differentiated based upon perceived distinctions in creditworthiness. Such requirements would be based either on ratings assigned by rating agencies or, in the case of a banking organization that met certain supervisory standards, on the organization’s internal credit ratings. The minimum capital requirements in the New Accord would also include a separate capital requirement for operational risk. In June 2004, the Basel Committee published new international guidelines for calculating regulatory capital. The U.S. banking regulators have published draft guidance of their interpretation of the new Basel guidelines. Certain of the largest U.S. banks will be required to calculate regulatory capital under the New Accord, in parallel with the existing capital rules beginning in 2007, and, in 2008, must calculate regulatory capital solely under the New Accord. AmSouth is not among this group of banks, and it is uncertain when AmSouth will become subject to the New Accord.

Bank regulators have the authority generally to raise capital requirements applicable to banking organizations beyond their current levels. However, the management of AmSouth is unable to predict whether and when higher capital requirements would be imposed, and, if so, at what levels and on what schedule.

Prompt Corrective Action

The FDI Act requires the federal banking regulators to take prompt corrective action in respect of FDIC-insured depository institutions that do not meet minimum capital requirements. The FDI Act establishes five capital tiers: “well capitalized,” “adequately capitalized,” “undercapitalized,” “significantly undercapitalized,” and “critically undercapitalized.” Under applicable regulations, a state member bank is defined as well capitalized if it maintains a Leverage Ratio of at least 5 percent, a risk-adjusted Tier 1 Capital Ratio of at least 6 percent, a Total Capital Ratio of at least 10 percent and is not subject to any order or written directive to maintain any specific capital level. A state member bank is defined as adequately capitalized if it maintains a Leverage Ratio of at least 4 percent, a risk-adjusted Tier 1 Capital Ratio of at least 4 percent, and a Total Capital Ratio of at least 8 percent. A bank may be deemed to be in a capitalization category that is lower than is indicated by its actual capital position if it is operating in an unsafe or unsound manner or receives an unsatisfactory examination rating. AmSouth believes that at December 31, 2004, the Bank had capital ratios sufficient to qualify as “well capitalized”. The FDI Act authorizes, and in some cases automatically imposes, serious restrictions on a bank’s business as it declines in capital-based tier.

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The capital-based prompt corrective action provisions of the FDI Act and the implementing regulations apply to FDIC-insured depository institutions such as the Bank and are not directly applicable to holding companies, like AmSouth, that control such institutions. However, the Federal Reserve Board has indicated that it will take appropriate action at the holding company level based on an assessment of the effectiveness of supervisory actions imposed upon subsidiary depository institutions pursuant to such provisions and regulations. Although the capital categories defined under the prompt corrective action regulations are not directly applicable to AmSouth under existing laws and regulations, if AmSouth were placed in a capital category it would qualify as well-capitalized as of December 31, 2004.

Brokered Deposits and Pass-Through Insurance

The FDIC has adopted regulations under the FDI Act governing the receipt of brokered deposits. Under the regulations, an FDIC-insured depository institution cannot accept, roll over or renew brokered deposits unless (a) it is well-capitalized or (b) it is adequately capitalized and receives a waiver from the FDIC. A depository institution that cannot receive brokered deposits also cannot offer “pass-through” insurance on certain employee benefit accounts. Whether or not it has obtained such a waiver, an adequately capitalized depository institution may not pay an interest rate on any deposits in excess of 75 basis points over certain prevailing market rates specified by regulation. There are no such restrictions on a depository institution that is well capitalized. Because the Bank was well-capitalized as of December 31, 2004, AmSouth believes the brokered deposits regulation will have no material effect on the funding or liquidity of the Bank.

Holding Company Structure

There are various legal restrictions on the extent to which AmSouth and its nonbank subsidiaries may borrow or otherwise obtain funding from the Bank. The Bank (and its subsidiaries) may only engage in borrowing and other “covered transactions” with nonbank and nonsavings bank affiliates to the following extent: (a) in the case of any single such affiliate, the aggregate amount of covered transactions of the Bank and its subsidiaries may not exceed 10 percent of the capital stock and surplus of the Bank; and (b) in the case of all affiliates, the aggregate amount of covered transactions of the Bank and its subsidiaries may not exceed 20 percent of the capital stock and surplus of the Bank. Covered transactions also are subject to certain collateralization requirements. “Covered transactions” are defined by statute to include a loan or extension of credit, as well as a purchase of securities issued by an affiliate, a purchase of assets (unless otherwise exempted by the Federal Reserve Board) from the affiliate, the acceptance of securities issued by the affiliate as collateral for a loan, and the issuance of a guarantee, acceptance, or letter of credit on behalf of an affiliate. Regulation W, which comprehensively implemented statutory restrictions on transactions between a bank and its affiliates, became effective on April 1, 2003. This Regulation combines the Federal Reserve Board’s interpretations and exemptions relating to Sections 23A and 23B of the Federal Reserve Act with interpretations of these statutory sections that were affected by the Gramm-Leach-Bliley Act. For example, Regulation W addresses the definition of “financial subsidiaries” for the purposes of affiliate transactions and the valuation of a bank’s investment in a financial subsidiary affiliate. The adoption and subsequent effectiveness of Regulation W did not have a material impact on AmSouth’s operations.

Under Federal Reserve Board policy, AmSouth is expected to act as a source of financial strength for, and to commit resources to support, the Bank. This support may be required at times when, absent such Federal Reserve Board policy, AmSouth may not be inclined to provide it. In addition, any capital loans by a bank holding company to a subsidiary bank are subordinate in right of payment to deposits and to certain other indebtedness of such subsidiary bank. In the event of a bank holding company’s bankruptcy, any commitment by the bank holding company to a federal bank regulatory agency to maintain the capital of a subsidiary bank will be assumed by the bankruptcy trustee and entitled to a priority of payment.

The FDI Act provides that, in the event of the “liquidation or other resolution” of an insured depository institution, the claims of depositors of such institution (including claims by the FDIC as subrogee of insured depositors) and certain claims for administrative expenses of the FDIC as receiver would be afforded a priority over other general unsecured claims against the institution, including any claims of the bank’s holding company as a creditor. If an insured depository institution fails, insured and uninsured depositors, along with the FDIC, will be placed ahead of unsecured, nondeposit creditors, including a parent holding company such as AmSouth, in its capacity as creditor, in order of priority of payment.

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Liability for Affiliate Insured Depository Institutions

Under the FDI Act, an insured depository institution, such as the Bank, can be held liable for any loss incurred by, or reasonably expected to be incurred by, the FDIC in connection with (a) the default of a commonly controlled FDIC-insured depository institution or (b) any assistance provided by the FDIC to any commonly controlled FDIC-insured depository institution “in danger of default.” “Default” is defined generally as the appointment of a conservator or receiver, and “in danger of default” is defined generally as the existence of certain conditions indicating that a default is likely to occur in the absence of regulatory assistance. The Bank is currently the only depository institution subsidiary of AmSouth. It is possible, however, that AmSouth will have other depository institution subsidiaries in the future.

The USA Patriot Act

In 2001, the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA Patriot Act) was signed into law. The USA Patriot Act broadened the application of anti-money laundering regulations to apply to additional types of financial institutions, such as broker-dealers, and strengthened the ability of the U.S. Government to detect and prosecute international money laundering and the financing of terrorism. The principal provisions of Title III of the USA Patriot Act require that regulated financial institutions, including state member banks: (i) establish an anti-money laundering program that includes training and audit components; (ii) comply with regulations regarding the verification of the identity of any person seeking to open an account; (iii) take additional required precautions with non-U.S. owned accounts; and (iv) perform certain verification and certification of money laundering risk for their foreign correspondent banking relationships. The USA Patriot Act also expanded the conditions under which funds in a U.S. interbank account may be subject to forfeiture and increased the penalties for violation of anti-money laundering regulations. Failure of a financial institution to comply with the USA Patriot Act’s requirements could have serious legal and reputational consequences for the institution. AmSouth has adopted policies, procedures and controls to address compliance with the requirements of the USA Patriot Act under the existing regulations and will continue to revise and update its policies, procedures and controls to reflect changes required by the USA Patriot Act and implementing regulations. See “Supervision and Regulation” above for a discussion of regulatory actions taken with respect to AmSouth’s compliance with the Bank Secrecy Act and ongoing compliance efforts.

Available Information

AmSouth maintains an Internet website at www.amsouth.com. AmSouth makes available free of charge through its website its annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to these reports, on the same day that AmSouth files these reports with the SEC. AmSouth’s (i) Corporate Governance Guidelines, (ii) Code of Conduct, (iii) Code of Ethics for Senior Financial Officers, and (iv) Charters of its Corporate Governance, Audit and Human Resources Committees are also available on the website. From AmSouth’s home page at www.amsouth.com, go to “Resource Centers” and click on “Investor Relations” to access these reports and other documents. AmSouth’s Corporate Governance Guidelines, Code of Conduct, Code of Ethics for Senior Financial Officers and Corporate Governance, Audit and Human Resources Committee Charters are also available in print upon written request addressed to Investor Relations, AmSouth Bancorporation, P.O. Box 11007, Birmingham, Alabama 35288.

The executive offices of AmSouth are located in the AmSouth Center in downtown Birmingham, Alabama, which is owned by the Bank. The Bank and its subsidiaries occupy various offices throughout Alabama, Florida, Tennessee, Mississippi, Louisiana and Georgia. These properties are owned, leased or subject to a ground lease. Leased properties principally constitute land and buildings under long-term leases in which the Bank and other non-bank subsidiaries maintain offices.

Additional information relating to properties is set forth in Note 6 of the Notes to Consolidated Financial Statements, which are incorporated herein by reference pursuant to Item 8 of this Form 10-K.

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In the ordinary course of business, AmSouth and its subsidiaries are from time to time named as defendants in or parties to pending and threatened legal actions and proceedings. Among the actions which are pending against AmSouth are actions brought on behalf of various classes of claimants. These actions and claims, including class actions, are similar to others that have been brought in recent years against financial institutions and relate to AmSouth’s lending, collections, loan servicing, depository, investment, trust and other activities. These actions and claims allege violations of consumer protection, securities, banking and other laws, both state and federal. Some of these claims and actions seek substantial compensatory and punitive damage awards and injunctive relief. Additionally, AmSouth, and certain of its subsidiaries which are regulated by one or more federal and state regulatory authorities, are the subject of regularly scheduled and special examinations, reviews and investigations conducted by such regulatory authorities and by law enforcement agencies. AmSouth may occasionally have disagreements with regulatory authorities and law enforcement agencies resulting from these investigations, examinations and reviews. As noted above, enforcement and compliance-related activity by government agencies has increased. Money laundering and anti-terrorism compliance is among the areas receiving a high level of focus in the present environment.

In October 2004, AmSouth entered into a deferred prosecution agreement with the U.S. Attorney for the Southern District of Mississippi relating to deficiencies in the Bank’s reporting of suspicious activities under the Bank Secrecy Act. At the same time, AmSouth entered into a cease and desist order with the Federal Reserve and the Alabama Department of Banking, as well as an order with the Financial Crimes Enforcement Network, relating to AmSouth’s deficiencies in compliance with the Bank Secrecy Act. Provided that AmSouth complies with the obligations under the deferred prosecution agreement for a period of twelve months, the U.S. Attorney has agreed not to take further action against the Company in connection with this matter. The Federal Reserve has also indicated it will restrict the Company’s expansion activities, including the branch expansion program, until such time as it believes that AmSouth is in substantial compliance with the requirements of the cease and desist order. Pursuant to these agreements, AmSouth has taken additional actions to ensure compliance with the Bank Secrecy Act. Among other things, these actions include independent third party reviews of all of the Company’s activities related to compliance with the Bank Secrecy Act, enhanced training of personnel, submission of a revised compliance program, and the adoption of new policies and procedures.

It may take a number of years to fully and finally resolve the legal proceedings, including actions, claims and disagreements with regulators and law enforcement agencies, currently pending due to their complexity and for other reasons. Further, in view of the inherent difficulty of predicting the outcome of such proceedings, AmSouth cannot state what the eventual outcome of these proceedings will be. Nonetheless, based on current knowledge and the advice of legal counsel, AmSouth’s management is of the opinion that the ultimate resolution of these legal proceedings, including the matters described above, will not have a material adverse effect on the consolidated financial condition, operations or liquidity of AmSouth.

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There were no matters brought to a vote of security holders during the fourth quarter of 2004.

Executive Officers of the Registrant

The executive officers of AmSouth, their ages, the positions held by them with AmSouth and certain of its subsidiaries, and their principal occupations for the last five years are as follows:

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PART II

AmSouth’s common stock, par value $1.00 per share, is listed for trading on the New York Stock Exchange under the symbol ASO. Quarterly high and low sales prices of, and cash dividends declared on, AmSouth common stock are set forth in Table 22 of Management’s Discussion and Analysis, which is incorporated herein by reference pursuant to Item 7 of this Form 10-K. As of February 22, 2005, there were 26,484 holders of record of AmSouth’s common stock (including participants in the Direct Stock Purchase and Dividend Reinvestment Plan).

Restrictions on the ability of the Bank to transfer funds to AmSouth at December 31, 2004, are set forth in Note 16 of the Notes to Consolidated Financial Statements, which are incorporated herein by reference pursuant to Item 8 of this Form 10-K. A discussion of certain limitations on the ability of the Bank to pay dividends to AmSouth and the ability of AmSouth to pay dividends on its common stock is set forth in Part I under the headings “Supervision and Regulation—Payment of Dividends” and “Supervision and Regulation—Capital Adequacy and Related Matters.”

Issuer Purchases of Equity Securities

Note: On April 17, 2003, AmSouth announced that its Board of Directors approved a plan to repurchase up to 25 million shares of the Company’s outstanding stock. There is no expiration date for this plan. No repurchase plans expired during the three months ended December 31, 2004. All of the shares purchased during the three months ended December 31, 2004, were related to employee compensation plans.

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The following table sets forth selected financial data for the last five years.

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The section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of AmSouth’s 2004 Annual Report to Shareholders is hereby incorporated herein by reference.

The information required by this item is included under the caption “Risk Management” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, which is hereby incorporated herein by reference pursuant to Item 7, above.

The Consolidated Financial Statements of AmSouth and Subsidiaries, the accompanying Notes to Consolidated Financial Statements and the Report of Independent Registered Public Accounting Firm contained in AmSouth’s 2004 Annual Report to Shareholders are hereby incorporated herein by reference.

None.

An evaluation was performed as of December 31, 2004 under the supervision and with the participation of AmSouth’s management, including the Chief Executive Officer (CEO) and Chief Financial Officer (CFO), of the effectiveness of the design and operation of AmSouth’s disclosure controls and procedures. Based on that evaluation, AmSouth’s management, including the CEO and CFO, concluded that AmSouth’s disclosure controls and procedures were effective as of December 31, 2004.

There were no changes in AmSouth’s internal controls over financial reporting during the quarter ended December 31, 2004 that have materially affected, or are reasonably likely to materially affect, AmSouth’s internal controls over financial reporting.

Management’s Report, Management’s Report on Internal Control Over Financial Reporting and the Report of Independent Registered Public Accounting Firm on Internal Control Over Financial Reporting contained in AmSouth’s 2004 Annual Report to Shareholders are hereby incorporated herein by reference.

Not Applicable.

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PART III

Biographical and business experience information about the directors and director nominees of AmSouth included in AmSouth’s Proxy Statement for the Annual Meeting of Shareholders to be held on April 21, 2005 (the Proxy Statement) under the caption “Election of Directors” and the information incorporated by reference pursuant to Item 13 below are hereby incorporated herein by reference. Information on AmSouth’s executive officers is included in Part I of this report.

Information regarding AmSouth’s Audit Committee included under the captions “Audit Committee” and “Audit Committee Financial Experts” of the Proxy Statement is hereby incorporated herein by reference.

Information regarding late filings under Section 16(a) of the Securities Exchange Act of 1934 included in the Proxy Statement under the caption “Section 16(a) Beneficial Ownership Reporting Compliance” is hereby incorporated herein by reference.

AmSouth’s Code of Ethics for Senior Financial Officers is available at www.amsouth.com, as discussed in “Available Information” on page 6 herein. AmSouth intends to disclose any amendments or waivers with respect to its Code of Ethics for Senior Financial Officers on its website at www.amsouth.com.

Information regarding compensation of directors and executive officers included under the caption “Executive Compensation” of the Proxy Statement is hereby incorporated herein by reference. However, the information provided in the Proxy Statement under the headings “Human Resources Committee Report on Executive Compensation” and “Performance Graph” shall not be deemed to be “soliciting material” or to be “filed” with the Securities and Exchange Commission, subject to Regulation 14A or 14C, other than as provided in Item 402 of Regulation S-K, or subject to liabilities of Section 18 of the Securities Exchange Act of 1934.

The information set forth under the caption “Voting Securities and Principal Holders Thereof” in the Proxy Statement is hereby incorporated herein by reference.

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EQUITY COMPENSATION PLAN INFORMATION

AS OF DECEMBER 31, 2004

Material features of equity compensation plans adopted or assumed without the approval of AmSouth shareholders are described below:

First American Corporation 1993 Non-Employee Director Stock Option Plan; Heritage Federal Bancshares 1994 Stock Option Plan for Non-Employee Directors

AmSouth assumed the First American Corporation 1993 Non-Employee Director Stock Option Plan, and the Heritage Federal Bancshares 1994 Stock Option Plan for Non-Employee Directors (the “FAC Director Plans”), in connection with AmSouth’s merger with First American Corporation in October 1999. Only directors of First American or Heritage Federal (a First American predecessor) who were not employees were eligible to receive awards under the FAC Director Plans. At the time the outstanding options under the FAC Director Plans were granted, the options were exercisable for common shares of First American Corporation or Heritage Federal Bancshares, as the case may be. All outstanding options were granted prior to AmSouth’s merger with First American, and awards are no longer granted under the FAC Director Plans. Under the FAC Director Plans, the exercise price of options may not be less than the fair market value of the stock into which the option is exercisable at the time of grant. Previously granted but unexercised options are subject to adjustment for any future stock dividends, splits, business combinations, or other changes in capitalization as described in the FAC Director Plans.

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First American Corporation Broad-Based Employee Stock Option Plan; Pioneer Bancshares, Inc. 1994 Long-Term Incentive Plan; Heritage Federal Bancshares, Inc. 1992 Stock Option Plan; Deposit Guaranty Corporation Long Term Incentive Plans

AmSouth assumed the plans described in the caption above (the “Predecessor Employee Plans”) in connection with AmSouth’s merger with First American Corporation in October 1999. Generally, only employees of the pertinent predecessor corporations were eligible to receive awards under the Predecessor Employee Plans, although under some plans non-employee directors could be granted non-qualified stock options. At the time the outstanding options under the Predecessor Employee Plans were granted, the options were exercisable for common shares of the pertinent predecessor corporation. Following AmSouth’s merger with First American, these options became exercisable for shares of AmSouth’s common stock. The number of shares these options are exercisable for and the exercise prices were adjusted in accordance with the terms of the merger between AmSouth and First American. All of these outstanding options were granted prior to AmSouth’s merger with First American, and awards are no longer granted under the Predecessor Employee Plans. Under the Predecessor Employee Plans, the exercise price of options generally may not be less than the fair market value of the underlying stock at the time of grant, although some plans permitted non-qualified options to be granted at exercise prices below market value. Options granted under the Predecessor Employee Plans were in some instances made subject to vesting over time. Previously granted but unexercised options are subject to adjustment for any future stock dividends, splits, combinations, or other changes in capitalization as described in the Predecessor Employee Plans. The Predecessor Employee Plans require that, in the event of a merger or other corporate reorganization affecting AmSouth, the holder of an option will be entitled to exercise such option, or, in some instances, to receive cash in the amount of the spread between the exercise price and fair market value.

AmSouth Bancorporation Deferred Compensation Plan

AmSouth has adopted the AmSouth Bancorporation Deferred Compensation Plan, which was amended and restated as of January 1, 2005. Members of management and highly compensated employees are eligible to participate. Under the Deferred Compensation Plan, a participant may elect to defer a portion (from 25% to 100%) of his or her annual bonus into Deferred Stock or other investments. The deferral election must specify a payment date, which may not be sooner than the third anniversary of the first day of the plan year to which the deferral relates. The cash amount of the bonus being deferred is exchanged for an equivalent number of “deemed” shares of AmSouth common stock based on the fair market value of such stock, or an equivalent number of “deemed’ shares of the investments available in the Thrift Plan. That number of shares of AmSouth common stock will be distributed to the participant on the selected payment date. The participant may elect to have such shares distributed in a lump sum or in installments, but must make such election in advance of the deferral. All amounts so deferred are fully vested and are not subject to forfeiture. In the event of stock splits, recapitalizations, reorganizations, or other similar transactions affecting AmSouth’s common stock, the Human Resources Committee can make such adjustments as it determines to be equitable. Effective January 1, 2005, the deferrals are deemed invested in accordance with the participant’s investment elections under the Thrift Plan. Amounts deferred after January 1, 2005 will be distributed in cash.

Amended and Restated Deferred Compensation Plan for Directors of AmSouth Bancorporation

AmSouth has adopted the Amended and Restated Deferred Compensation Plan for Directors of AmSouth Bancorporation. Directors of AmSouth are eligible to participate. Under this plan, a participant may elect to defer a portion of his or her retainer and meeting fees into Deferred Stock. Upon each such deferral, the cash amount of the payment being deferred is converted into an equivalent number of “deemed” shares of AmSouth common stock based on the fair market value of such stock. The director must elect whether to receive payment upon retirement or upon reaching a certain age, and whether to be paid in a lump sum or in specified annual installments. All amounts so deferred are fully vested and are not subject to forfeiture. In the event of stock splits, recapitalizations, reorganizations, or other similar transactions affecting AmSouth’s common stock, the Human Resources Committee can make such adjustments as it determines to be equitable.

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AmSouth Bancorporation Amended and Restated 1991 Employee Stock Incentive Plan (formerly First American Corporation Amended and Restated 1991 Employee Stock Incentive Plan)

AmSouth assumed the plan described in the caption above (the “1991 Plan”) in connection with AmSouth’s merger with First American Corporation in October 1999. The 1991 Plan permitted grants to officers and other key employees. Any outstanding options that were granted under the 1991 Plan before the merger of AmSouth and First American became exercisable into shares of AmSouth’s common stock under the terms of that merger. AmSouth made a grant of stock options under the 1991 Plan in 2000 and 2001, which are reflected in the table above in column (a). No additional grants may be made under the 1991 Plan, which terminated in 2001. Shareholders of First American approved the 1991 Plan, but pre-merger AmSouth shareholders did not approve this plan.

The information set forth in the Proxy Statement under the caption “Certain Relationships, Related Transactions and Legal Proceedings” is hereby incorporated herein by reference.

The information set forth in the Proxy Statement under the caption “Independent Registered Public Accounting Firm” is hereby incorporated herein by reference.

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PART IV

(a)    Financial Statements and Financial Statement Schedules

Financial Statements

The following report of independent registered public accounting firm and consolidated financial statements of AmSouth and its subsidiaries included in AmSouth’s 2004 Annual Report to Shareholders are incorporated herein by reference pursuant to Item 8.

Report of Ernst & Young, LLP, Independent Registered Public Accounting Firm

Consolidated Balance Sheets-December 31, 2004 and 2003

Consolidated Statements of Earnings-Years ended December 31, 2004, 2003 and 2002

Consolidated Statements of Shareholders’ Equity-Years ended December 31, 2004, 2003 and 2002

Consolidated Statements of Cash Flows-Years ended December 31, 2004, 2003 and 2002

Notes to Consolidated Financial Statements

Financial Statement Schedules

All schedules to the consolidated financial statements required by Article 9 of Regulation S-X and all other schedules to the financial statements of AmSouth required by Article 5 of Regulation S-X are not required under the related instructions or are inapplicable and, therefore, have been omitted, or the required information is contained in the Consolidated Financial Statements or the notes thereto, which are incorporated herein by reference pursuant to Item 8, Financial Statements and Supplementary Data.

(b)    Exhibits

The exhibits listed in the Exhibit Index at page 20 of this Form 10-K are filed herewith or are incorporated herein by reference.

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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.

Date: March 15, 2005

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.

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EXHIBIT INDEX

The following is a list of exhibits including items incorporated by reference. Compensatory plans and arrangements are identified by an asterisk.

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NOTES TO EXHIBITS

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