Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies	3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies	Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Ally Financial Inc. (together with its consolidated subsidiaries unless the context otherwise requires, Ally, the Company, we, us, or our) is a financial-services company with the nation’s largest all-digital bank and an industry-leading automotive financing and insurance business, driven by a mission to “Do It Right” and be a relentless ally for all stakeholders. The Company serves customers with deposits and securities brokerage and investment advisory services as well as automotive financing and insurance offerings. The Company also includes a seasoned corporate finance business that offers capital for equity sponsors and middle-market companies. Ally is a Delaware corporation and is registered as a BHC under the BHC Act and an FHC under the GLB Act. Our accounting and reporting policies conform to U.S. GAAP. Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. Certain reclassifications may have been made to the prior periods’ financial statements and notes to conform to the current period’s presentation, which did not have a material impact on our Condensed Consolidated Financial Statements. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure, including those of contingent assets and liabilities at the date of the financial statements. It also includes estimates related to the income and expenses during the reporting period and the related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. Our most significant estimates pertain to the allowance for loan losses, the valuations of automotive operating lease assets and residuals, the fair value of financial instruments, and the determination of the provision for income taxes. The Condensed Consolidated Financial Statements at March 31, 2026, and for the three months ended March 31, 2026, and 2025, are unaudited but reflect all adjustments that are, in management’s opinion, necessary for the fair presentation of the results for the interim periods presented. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements (and the related Notes) included in our Annual Report on Form 10-K for the year ended December 31, 2025, as filed on February 25, 2026, with the SEC. Significant Accounting Policies Income Taxes In calculating the provision for interim income taxes, in accordance with ASC 740, Income Taxes, we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Consolidated Financial Statements in our 2025 Annual Report on Form 10-K, which describes our annual significant income tax accounting policy and related methodology. Refer to Note 1 to the Consolidated Financial Statements in our 2025 Annual Report on Form 10-K regarding additional significant accounting policies. Recently Issued Accounting Standards Expense Disaggregation Disclosures (ASU 2024-03) In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income (Subtopic 220-40): Expense Disaggregation Disclosures. The purpose of this ASU is to provide additional disclosure that will allow investors to better understand an entity’s performance, better assess an entity’s prospects for future cash flows, and more easily compare an entity’s performance over time and in relation to other similar entities. This ASU will require that an entity disclose, on an interim and annual basis, a disaggregation in the notes to the financial statements of certain income statement line items if the line item includes any of the five required expense categories, which are defined as (1) purchases of inventory, (2) employee compensation, (3) depreciation (including amortization of a finance ROU asset and leasehold improvements), (4) intangible asset amortization, and (5) depletion expense. For the “employee compensation” category, banking entities may continue to present compensation expense on the face of the income statement in accordance with Regulation S-X Rule 210.9-04. The disclosure should include a qualitative description of other expenses included within the income statement line item that are otherwise not disaggregated. This ASU will also require entities to disclose their total selling expenses for each reporting period. Selling expenses are not defined within the ASU, which will require entities to determine and disclose how they define selling expenses on an annual basis. The amendments are effective on January 1, 2027, for annual reporting, and for interim reporting thereafter, with early adoption permitted. The amendments must be applied using either a prospective or retrospective approach. We do not expect the impact of these amendments to be material. Targeted Improvements to the Accounting for Internal-Use Software (ASU 2025-06) In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The purpose of this ASU is to improve the accounting for internal-use software costs by aligning the accounting with modern software development processes. This ASU removes all references to sequential software development project stages from U.S. GAAP, but does not change the types of costs that are eligible to be capitalized. Under the updated guidance, entities will be required to begin capitalizing software project costs when (1) management has authorized and committed to funding the software project and (2) it is probable that the project will be completed, and the software will be used to perform the function intended (called the “probable-to-complete” threshold). When evaluating whether the probable-to-complete threshold is met, entities must consider whether there is significant development uncertainty associated with the software, including determining whether the software project contains technological innovations or novel, unique, or unproven functions or features. Entities should also consider if there are significant performance requirements (e.g., functions or features) of the software project that have not yet been identified or continue to be substantially revised. The amendments do not define what is considered “significant” and instead will require management judgment. The amendments are effective January 1, 2028, with early adoption permitted. The amendments can be applied using a prospective approach, a retrospective approach, or a modified approach that bases the adoption of the amendments on the completion status of the software project as of the adoption date. We are currently evaluating the impact of these amendments. Purchased Loans (ASU 2025-08) In November 2025, the FASB issued ASU 2025-08, Financial Instruments—Credit Losses (Topic 326): Purchased Loans. This ASU expands the gross-up approach applied to PCD financial assets to loans that are purchased and considered seasoned, excluding credit card loans, debt securities, and trade receivables accounted for under the revenue recognition guidance. Under the expanded gross-up approach, the amortized cost basis for a seasoned loan receivable will be the purchase price plus the initial measurement of the allowance for loan losses, on the acquisition date. Any remaining discount embedded in the purchase price will be amortized into interest income over the term of the loan. The purchased seasoned loan designation would be evaluated on a loan-by-loan basis. The resulting accounting will reflect no day-one provision expense on qualifying seasoned loans and a lower yield over time than what is currently presented under the non-PCD model. Loans acquired in a business combination would be considered seasoned. For a loan acquired through an asset transfer or by consolidating a VIE, the acquisition must be at least 90 days after loan origination and the acquirer must not have been involved in originating the loan for the loan to be considered seasoned. The amendments are effective January 1, 2027, with early adoption permitted and must be adopted on a prospective basis. We are currently evaluating the impact of these amendments.

Ally Financial Inc. (together with its consolidated subsidiaries unless the context otherwise requires, Ally, the Company, we, us, or our) is a financial-services company with the nation’s largest all-digital bank and an industry-leading automotive financing and insurance business, driven by a mission to “Do It Right” and be a relentless ally for all stakeholders. The Company serves customers with deposits and securities brokerage and investment advisory services as well as automotive financing and insurance offerings. The Company also includes a seasoned corporate finance business that offers capital for equity sponsors and middle-market companies. Ally is a Delaware corporation and is registered as a BHC under the BHC Act and an FHC under the GLB Act.

Our accounting and reporting policies conform to U.S. GAAP. Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. Certain reclassifications may have been made to the prior periods’ financial statements and notes to conform to the current period’s presentation, which did not have a material impact on our Condensed Consolidated Financial Statements. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure, including those of contingent assets and liabilities at the date of the financial statements. It also includes estimates related to the income and expenses during the reporting period and the related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. Our most significant estimates pertain to the allowance for loan losses, the valuations of automotive operating lease assets and residuals, the fair value of financial instruments, and the determination of the provision for income taxes.

The Condensed Consolidated Financial Statements at March 31, 2026, and for the three months ended March 31, 2026, and 2025, are unaudited but reflect all adjustments that are, in management’s opinion, necessary for the fair presentation of the results for the interim periods presented. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements (and the related Notes) included in our Annual Report on Form 10-K for the year ended December 31, 2025, as filed on February 25, 2026, with the SEC.

In calculating the provision for interim income taxes, in accordance with ASC 740, Income Taxes, we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Consolidated Financial Statements in our 2025 Annual Report on Form 10-K, which describes our annual significant income tax accounting policy and related methodology.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income (Subtopic 220-40): Expense Disaggregation Disclosures. The purpose of this ASU is to provide additional disclosure that will allow investors to better understand an entity’s performance, better assess an entity’s prospects for future cash flows, and more easily compare an entity’s performance over time and in relation to other similar entities. This ASU will require that an entity disclose, on an interim and annual basis, a disaggregation in the notes to the financial statements of certain income statement line items if the line item includes any of the five required expense categories, which are defined as (1) purchases of inventory, (2) employee compensation, (3) depreciation (including amortization of a finance ROU asset and leasehold improvements), (4) intangible asset amortization, and (5) depletion expense. For the “employee compensation” category, banking entities may continue to present compensation expense on the face of the income statement in accordance with Regulation S-X Rule 210.9-04. The disclosure should include a qualitative description of other expenses included within the income statement line item that are otherwise not disaggregated. This ASU will also require entities to disclose their total selling expenses for each reporting period. Selling expenses are not defined within the ASU, which will require entities to determine and disclose how they define selling expenses on an annual basis. The amendments are effective on January 1, 2027, for annual reporting, and for interim reporting thereafter, with early adoption permitted. The amendments must be applied using either a prospective or retrospective approach. We do not expect the impact of these amendments to be material.

In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The purpose of this ASU is to improve the accounting for internal-use software costs by aligning the accounting with modern software development processes. This ASU removes all references to sequential software development project stages from U.S. GAAP, but does not change the types of costs that are eligible to be capitalized. Under the updated guidance, entities will be required to begin capitalizing software project costs when (1) management has authorized and committed to funding the software project and (2) it is probable that the project will be completed, and the software will be used to perform the function intended (called the “probable-to-complete” threshold). When evaluating whether the probable-to-complete threshold is met, entities must consider whether there is significant development uncertainty associated with the software, including determining whether the software project contains technological innovations or novel, unique, or unproven functions or features. Entities should also consider if there are significant performance requirements (e.g., functions or features) of the software project that have not yet been identified or continue to be substantially revised. The amendments do not define what is considered “significant” and instead will require management judgment. The amendments are effective January 1, 2028, with early adoption permitted. The amendments can be applied using a prospective approach, a retrospective approach, or a modified approach that bases the adoption of the amendments on the completion status of the software project as of the adoption date. We are currently evaluating the impact of these amendments.

In November 2025, the FASB issued ASU 2025-08, Financial Instruments—Credit Losses (Topic 326): Purchased Loans. This ASU expands the gross-up approach applied to PCD financial assets to loans that are purchased and considered seasoned, excluding credit card loans, debt securities, and trade receivables accounted for under the revenue recognition guidance. Under the expanded gross-up approach, the amortized cost basis for a seasoned loan receivable will be the purchase price plus the initial measurement of the allowance for loan losses, on the acquisition date. Any remaining discount embedded in the purchase price will be amortized into interest income over the term of the loan. The purchased seasoned loan designation would be evaluated on a loan-by-loan basis. The resulting accounting will reflect no day-one provision expense on qualifying seasoned loans and a lower yield over time than what is currently presented under the non-PCD model. Loans acquired in a business combination would be considered seasoned. For a loan acquired through an asset transfer or by consolidating a VIE, the acquisition must be at least 90 days after loan origination and the acquirer must not have been involved in originating the loan for the loan to be considered seasoned. The amendments are effective January 1, 2027, with early adoption permitted and must be adopted on a prospective basis. We are currently evaluating the impact of these amendments.