We have audited the accompanying statements of net assets available for benefits of the Regions Financial Corporation Supplemental 401(k) Plan as of December 31, 2004 and 2003, and the related statements of changes in net assets available for benefits for each of the three years in the period ended December 31, 2004. These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with 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 Plan's internal control over financial reporting. Our audits 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 Plan's internal control over financial reporting. Accordingly, we express no such opinion. An audit 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 audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2004 and 2003, and the changes in its net assets available for benefits for each of the three years in the period ended December 31, 2004, in conformity with U.S. generally accepted accounting principle.

Birmingham, Alabama
June 23, 2005

Table of Contents

Table of Contents

Table of Contents

December 31, 2004

The financial statements of Regions Financial Corporation Supplemental 401(k) Plan (the Plan) have been prepared on the accrual basis of accounting.

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

The following description of the Plan provides only general information. Participants should refer to the Plan Description for a more complete description of the Plan's provisions.

The Plan which commenced on January 1, 2001, is a non-qualified deferred compensation plan and was established by Regions Financial Corporation (Plan Sponsor or the Company) for the purpose of providing supplemental deferred compensation opportunities for a select group of its highly compensated or management employees. The Plan at all times shall be entirely unfunded and no provision shall at any time be made with respect to segregating any assets of the Company for payment of any benefits. Funds invested to provide benefit under the Plan are protected through a Rabbi Trust and shall continue for all purposes to be part of the general assets of the Company. No participant, beneficiary or any other person shall have any interest in any particular assets of the Company by reason of the right to receive a benefit under the Plan and to the extent the participant, beneficiary or any other person acquires a right to receive benefits under the Plan, such right shall be no greater than the right of any unsecured creditor of the Company. The Company does not guarantee that any funds in a trust or assets of the Company will be sufficient to pay any benefits of the Plan.

Table of Contents

Employees participate in the Plan by making an irrevocable election at the beginning of each plan year. The election shall be effective for succeeding plan years until the election is revoked by the participant.

Benefits under the Plan are based on amounts credited to each participant's account. The credits to a participant's account is the aggregate amount of salary deferrals and profit sharing bonus deferrals which would have been deferred under the Company's qualified 401(k) Plan but for limitations imposed by the Internal Revenue Code, plus credited matching contributions and credited earnings thereon.

The matching contribution shall be credited to Regions Financial Corporation common stock until the date at which the Participant is eligible for diversification under the Company's qualified 401(k) Plan.

All benefits are vested at all times except for amounts credited as matching contributions which vest upon completion of 3 years of service as defined in the Plan. Forfeited matching contributions will be the property of the Company and will remain as general assets of the Company.

On termination of service, a participant may receive a lump-sum amount equal to the vested value of his or her account, or upon death, disability or retirement, elect to receive annual installments over a 10-year period. Plan provisions exist for accelerated vesting and distribution rights due to a change of control as per the terms of the plan document.

Table of Contents

Although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time. Upon termination of the Plan, the deferred compensation credited to the accounts of the participants shall be distributed to the participants and their beneficiaries at such time or times and in such manner as determined by the Company.

A Receivable from Plan Sponsor is included in plan assets for the fair value of assets held by the Company in a Rabbi Trust (the Trust) by Regions Morgan Keegan (RMK) Trust (the trustee), an affiliate of the Company, which has been established to provide benefits under the Plan. The assets of the Trust consist of cash, interest and dividends receivable, mutual fund investments, and stock of the Plan Sponsor. Participants can direct how their contributions are invested within the Trust. However, the specific investments described below are not assets of the Plan itself, but rather of the Trust. The following information on assets held by the Trust is presented for informational purposes.

The mutual fund securities held by the Trust are stated at aggregate fair value. Securities, which are traded on a national securities exchange, are valued at the last reported sales price on the last business day of the year. Investments traded in the over-the-counter market are valued at the average of last reported bid and ask prices and listed securities for which no sale was reported on that date are valued at last reported sales price. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date.

Table of Contents

Assets held by the Trust include the following:

Table of Contents

The increase in fair value of receivable from Plan Sponsor includes dividend and interest income of $287,419, $127,508 and $55,628 for 2004, 2003 and 2002, respectively, and appreciation (depreciation) of investments held by the Trust as outlined in the table below. The investments held by the Trust (including investments purchased, sold and held during the year) appreciated/depreciated in fair value as determined by quoted market prices as follows:

Table of Contents

1. Less than 5%

Information about the Regions Financial Stock Fund net assets held by the Trust is as follows:

Table of Contents

Significant components of changes in net assets for both the participant-directed and nonparticipant-directed components of the Regions Financial Stock Fund are presented below.

The Plan is a non-qualified plan that does not qualify for all special tax treatment afforded to deferred compensation plans that meet qualification requirements contained in section 401(a) of the Internal Revenue Code. The Plan has been structured as a top hat plan and assets equal to the fair value of the Receivable from Plan Sponsor are held in a Rabbi Trust.

During the year ended December 31, 2004, substantially all investment transactions held in the Rabbi Trust were with investment funds managed by Regions Morgan Keegan Trust and are therefore related party transactions.

All expenses incurred in the administration of the Plan including trustee fees, legal and accounting fees, are paid directly by Regions Financial Corporation and affiliates (the Company).

A Receivable from Plan Sponsor is included in Plan assets as of December 31, 2004, in the amount of $26,045,436, which represents the value of benefits due to the participants in the Plan.

Table of Contents

The Plan invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participants' account balances and the amounts reported in the statements of net assets available for benefits.

Table of Contents

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused the annual report to be signed by the undersigned thereunto duly authorized.

Date: June 28, 2005

Table of Contents