UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the fiscal year ended December 31, 2014

or

For transition period from                      to                     

Commission File Number of Issuing Entity: 000-20787-07

AMERICAN EXPRESS CREDIT ACCOUNT MASTER TRUST

(Issuing Entity in respect of the Certificates)

(Exact name of Depositors as specified in their respective charters)

(Exact name of Sponsors as specified in their respective charters)

(212) 815-6258

(Telephone Number, including area code

of the Issuing Entity,

c/o The Bank of New York Mellon)

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

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

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    YES  ¨    NO  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    YES  ¨    NO  x

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 whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§229.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    YES  ¨    NO  ¨

[Rule 405 of Regulation S-T is not applicable.]

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.  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. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    YES  ¨    NO  x

Registrant has no voting or non-voting common equity outstanding held by non-affiliates.

DOCUMENTS INCORPORATED BY REFERENCE: NONE

PART I

The following Items have been omitted in accordance with General Instruction J to Form 10-K:

Not Applicable.

Not Applicable.

Substitute Information provided in accordance with General Instruction J to Form 10-K:

Item 1112(b) of Regulation AB: Significant obligors of pool assets (Financial information).

The pool assets held by the American Express Credit Account Master Trust (the “Trust”) do not include any significant obligors.

Item 1114(b)(2) of Regulation AB: Credit enhancement and other support, except for certain derivatives instruments (Financial information).

Based on the standards set forth in Item 1114(b) of Regulation AB, no information is required in response to this Item.

Item 1115(b) of Regulation AB: Certain derivatives instruments (Financial information).

Based on the standards set forth in Item 1115(b) of Regulation AB, no information is required in response to this Item.

Item 1117 of Regulation AB: Legal proceedings.

During the last several years as regulatory interest in credit card network pricing to merchants or terms of merchant rules and contracts has increased, American Express Company and its subsidiaries (“American Express”) have responded to many inquiries from banking and competition authorities throughout the world.

In 2010, the DOJ, along with Attorneys General from Arizona, Connecticut, Hawaii (Hawaii has since withdrawn its claim), Idaho, Illinois, Iowa, Maryland, Michigan, Missouri, Montana, Nebraska, New Hampshire, Ohio, Rhode Island, Tennessee, Texas, Utah and Vermont filed a complaint in the U.S. District Court for the Eastern District of New York against American Express, MasterCard International Incorporated and Visa, Inc., alleging a violation of Section 1 of the Sherman Antitrust Act. The complaint alleges that the defendants’ policies prohibiting merchants from steering a customer to use another network’s card, another type of card or another method of payment (“anti-steering” and “non-discrimination” rules and contractual provisions) violate the antitrust laws. The complaint seeks a judgment permanently enjoining the defendants from enforcing their anti-steering and non-discrimination rules and contractual provisions. The complaint does not seek monetary damages.

The DOJ matter was coordinated pre-trial with individual and putative class actions pending in the Eastern District of New York against American Express brought by merchants alleging that the “anti-steering” provisions in its merchant acceptance agreements with the plaintiffs violate federal antitrust laws. As alleged by the plaintiffs, these provisions prevent merchants from steering consumers or offering consumers incentives to use alternative forms of payment when consumers wish to use an American Express-branded card. Plaintiffs seek damages and injunctive relief. Arbitration proceedings raising similar claims also have been filed.

In July 2004, American Express was named as a defendant in a putative class action captioned The Marcus Corporation v. American Express Company, et al., in which the plaintiffs allege an unlawful antitrust tying arrangement between certain of American Express’ charge cards and credit cards in violation of various state and federal laws. The plaintiffs in these actions seek injunctive relief and an unspecified amount of damages.

In December 2013, American Express announced a proposed settlement of the Marcus case and the putative class actions challenging American Express’ “anti-steering” or non-discrimination provisions. The settlement, which provides for certain injunctive relief for the proposed classes, received preliminary approval in the United States District Court for the Eastern District of New York. The final approval hearing was held on September 17, 2014 and American Express is awaiting decision.

A non-jury trial in the DOJ matter concluded on August 18, 2014. Closing arguments were held on October 9, 2014 following submission of post-trial proposed findings and briefs. On February 19, 2015, the trial court found that the challenged provisions were anticompetitive and will now determine the scope of the remedy when it enters judgment in the case. American Express intends to vigorously pursue an appeal of the decision and judgment. A trial date for the individual merchant actions has not been set. Defendants’ motion for summary judgment in the individual merchant actions is pending.

In July 2004, a purported class action complaint, Ross, et al. v. American Express Company, American Express Travel Related Services and American Express Centurion Bank, was filed in the United States District Court for the Southern District of New York alleging that American Express conspired with Visa, MasterCard and Diners Club in the setting of foreign currency conversion rates and in the inclusion of arbitration clauses in certain of their cardholder agreements. The suit seeks injunctive relief and unspecified damages. The class is defined as “all Visa, MasterCard and Diners Club general-purpose cardholders who used cards issued by any of the MDL Defendant Banks.” American Express Card Members are not part of the class. The settlement of the claims asserted on behalf of the damage class concerning foreign currency conversion rates was approved in 2012. On April 10, 2014, following a trial of the claims asserted by the injunction class concerning cardholder arbitration clauses, the Court dismissed plaintiffs’ claims and granted judgment in favor of American Express. Plaintiffs have appealed.

In October 2009, a putative class action, captioned Lopez, et al. v. American Express Bank, FSB and American Express Centurion Bank, was filed in the United States District Court for the Central District of California. The amended complaint sought to certify a class of California American Express Card Members whose interest rates were changed from fixed to variable in or around August 2009 or otherwise increased. On August 20, 2014, plaintiffs filed an amended nationwide complaint and an unopposed motion for preliminary approval of a settlement of the claims alleged in that complaint. The settlement provides for certain relief to class members, attorneys’ fees and costs of up to $6 million. On September 22, 2014, the motion for preliminary approval was denied without prejudice to renew. The parties are responding to the Court’s questions regarding the class notice and claims processes and the request for preliminary approval will be renewed.

PART II

The following Items have been omitted in accordance with General Instruction J to Form 10-K:

Item 9B. Other Information.

Not Applicable.

PART III

The following Items have been omitted in accordance with General Instruction J to Form 10-K:

Substitute Information provided in accordance with General Instruction J to Form 10-K:

Item 1119 of Regulation AB: Affiliations and Certain Relationships and Related Transactions.

Information required by Item 1119 of Regulation AB has been omitted from this report on Form 10-K in reliance on the Instruction to Item 1119.

Item 1122 of Regulation AB: Compliance with Applicable Servicing Criteria.

Each of American Express Travel Related Services Company, Inc. (“TRS”) (for itself and on behalf of its wholly owned subsidiaries Amex Card Services Company (“ACSC”), American Express Centurion Bank and American Express Bank, FSB), TransCentra, Inc. (formerly known as Regulus Group LLC) (“TransCentra”) (for itself and its wholly owned subsidiaries), and The Bank of New York Mellon (each, a “Servicing Participant”) has been identified by the registrant as a party participating in the servicing function with respect to the pool assets held by the American Express Credit Account Master Trust for the period covered by this Form 10-K. Each of the Servicing Participants has completed a report on an assessment of compliance with the servicing criteria applicable to such Servicing Participant (each, a “Report on Assessment”) as of and for the year ended December 31, 2014, which Reports on Assessment are attached as exhibits to this Form 10-K. In addition, each of the Servicing Participants has provided an attestation report (each, an “Attestation Report”) by a registered independent public accounting firm regarding its related Report on Assessment. Each Attestation Report is attached as an exhibit to this Form 10-K.

Vendors

A Servicing Participant may engage one or more vendors, who are not considered servicers for purposes of Regulation AB, to perform specific and limited, or scripted activities that address all or a portion of one or more servicing criteria applicable to such Servicing Participant. In general in these cases, the Servicing Participant has instituted policies and procedures to monitor whether such vendors’ activities comply in all material respects with such servicing criteria, and may elect to take responsibility for assessing compliance with the servicing criteria applicable to such vendors’ activities in such Servicing Participant’s Report on Assessment.

Where the Servicing Participant has not instituted such policies and procedures, or where the Servicing Participant does not otherwise elect to take responsibility for assessing its vendors’ activities, the vendor is itself treated as a Servicing Participant and is required to provide its own Report on Assessment and related Attestation Report.

Exceptions

No Report on Assessment or related Attestation Report has identified any material instance of noncompliance with the servicing criteria identified in such Report on Assessment as applicable to the related Servicing Participant. In addition, no Report on Assessment or related Attestation Report has identified any material deficiency in such Servicing Participant’s policies and procedures to monitor vendor compliance.

Platform Level Reports

Regulations of the Securities and Exchange Commission (the “SEC”) require that each Servicing Participant complete a Report on Assessment at a “platform” level, meaning that the transactions covered by the Report on Assessment should include all asset-backed securities transactions involving such Servicing Participant that are backed by the same asset type. During 2014, TRS’ proprietary facilities conducted paper payment remittance processing services and performed billing dispute services. TransCentra also performed paper payment remittance processing services at three locations in the United States. As a remittance processor, TransCentra is responsible for, among other services, transmitting payment information to TRS, which TRS in turn uses to update its account obligor records. In its Report on Assessment attached as Exhibit 33.2 to this Form 10-K, TransCentra defines its platform to include (i) remittance processing services it provides to customers who are issuers or servicers of asset-backed securities transactions and (ii) who have requested confirmation of TransCentra’s compliance in connection with loan and/or receivables portfolios that include pool assets for asset backed securities transactions. In addition, eFunds Corporation (“eFunds”), a wholly owned subsidiary of Fidelity National Information Services, Inc., also performs billing dispute services at its Gurgaon and Mumbai, India sites. Within guidelines prescribed by TRS, eFunds is responsible for all aspects of billing disputes, from front end capture of information to the resolution of disputes between cardmembers and merchants. The Bank of New York Mellon is Trustee of the Trust. In its Report on Assessment attached as Exhibit 33.3 to this Form 10-K, The Bank of New York Mellon defines its platform to include publicly issued (i.e., transaction-level reporting initially required under the Securities Exchange Act of 1934, as amended) asset-backed securities issued on or after January 1, 2006 (and like-kind transactions issued prior to January 1, 2006), that are subject to Regulation AB for which The Bank of New York Mellon provides trustee, securities administration, paying agent or custodial services, as defined and to the extent applicable in the transaction agreements, other than residential mortgage-backed securities and other mortgage-related asset-backed securities.

None of TRS or the Trust is an affiliate of TransCentra or The Bank of New York Mellon.

Item 1123 of Regulation AB: Servicer Compliance Statement.

Each of TRS, ACSC, American Express Centurion Bank, American Express Bank, FSB and TransCentra has been identified by the registrant as a servicer or subservicer with respect to the pool assets held by the Trust for the period covered by this Form 10-K. With the exception of ACSC, each of them has provided a Statement of Compliance for the period covered by this Form 10-K (a “Compliance Statement”), in each case signed by an authorized officer thereof. Each Compliance Statement is attached as an exhibit to this Form 10-K. Effective January 1, 2015, ACSC merged into TRS. Therefore, the Compliance Statement provided by TRS and the review and certification described therein encompass the servicing procedures performed by ACSC during the period covered by this Form 10-K.

PART IV

Item 15. Exhibits and Financial Statement Schedules.

SIGNATURES

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

Dated: March 27, 2015

EXHIBIT INDEX

The following exhibits are filed as part of this Annual Report or, where indicated, were heretofore filed and are hereby incorporated by reference (* indicates exhibits electronically filed herewith).