Items A, B and C
Whether the corporation is in a controlled group under sections 59(k)(1)(D) and 52, is an FPMG member, and has already determined it is an applicable corporation.
4626
Alternative Minimum Tax—Corporations
- Agency
- IRS
- Revision
- 2025
- Fillable fields
- 813
- Pages
- 8
- Official source
- IRS form page
- Checked
- October 21, 2026
2025 Form 4626: Alternative Minimum Tax for Corporations
Form 4626, Alternative Minimum Tax for Corporations, is a corporate form. The instructions say it is used to determine whether a corporation is an applicable corporation under section 59(k) and to calculate the corporate alternative minimum tax (CAMT) under section 55 for applicable corporations. This page covers the 2025 form, which the corporation attaches to its income tax return.
The form starts with three yes or no items, then Part I tests applicable corporation status from adjusted financial statement income (AFSI) over the three preceding tax years. Part II figures the tax, starting from net income on the applicable financial statement (AFS) and multiplying AFSI by 15%. Parts III to VI hold the supporting schedules for certain taxes, the CAMT foreign tax credit, group members and controlled foreign corporations (CFCs).
The What's New section of the instructions lists a new Item C and a new optional interim simplified method for checking applicable corporation status. You can fill out Form 4626 free in your browser on this page and download it without an account.
What's on Form 4626
Part I: Applicable Corporation Determination
AFS net income and adjustments for the first, second and third preceding years, the 3-year average annual AFSI, the $1 billion question on line 8 and the FPMG $100 million test on lines 10 to 16.
Part II: Corporate Alternative Minimum Tax
Current-year AFSI, the financial statement net operating loss, 15% of AFSI, the CAMT foreign tax credit, tentative minimum tax, regular tax, base erosion minimum tax and the alternative minimum tax on line 13.
Part III: certain taxes
Foreign and federal current and deferred income tax provisions and taxes in equity method investment income, totaled on line 7 and carried to Part II, line 2g.
Part IV: CAMT foreign tax credit
Section I figures the credit, Section II lists allowable CFC CAMT foreign income taxes by CFC, and Section III reconciles the carryover for CFCs.
Parts V and VI: members and CFCs
Part V lists controlled group and FPMG members with EINs and financial statement income. Part VI lists each CFC's pro-rata share of adjusted net income or loss.
How to fill out Form 4626
- 1
Items A to C
Answer the three questions. A Yes on Item A or Item B means Part V is completed. A Yes on Item C means Part I is skipped and the corporation continues to Part II.
- 2
Part I, lines 1 to 7
Enter AFS net income or loss and adjustments in columns (a), (b) and (c) for the 3-tax-year period before the current year, then divide line 6 by the number of tax years to get the average on line 7.
- 3
Part I, lines 8 to 16
The instructions say that if line 7 is $1 billion or less, check No, stop and attach the form to the return. FPMG members continue to the $100 million test, which ends on line 16.
- 4
Supporting parts
Complete Part III for line 2g, Part VI for line 2e, and Part IV if the corporation elects the section 901 foreign tax credit for regular tax. Their totals carry into Part II.
- 5
Part II, lines 1 to 13
Figure AFSI, multiply line 6 by 15% (0.15), subtract the CAMT foreign tax credit, then subtract regular tax and base erosion minimum tax. Line 13 goes on Form 1120, Schedule J, line 3, or the matching line of the return.
- 6
Statement of rules applied
The instructions say corporations include with Form 4626 a statement describing the approach taken and the guidance relied upon, such as the sections of the proposed regulations applied.
Why fill Form 4626 on indox
You get the real form, filled in a browser tab, with nothing standing between you and the finished PDF.
- Fill the form right in your browser, no software to install
- Free to fill and free to download, with no account
- The official blank straight from the IRS, not a copy someone retyped
- Works on a phone, tablet or computer
When to file, simplified tests and related forms
When and where
The instructions say to attach Form 4626 to the corporation's income tax return (or exempt organization business income tax return, if applicable) and file by the due date, including extensions, for that return.
Interim simplified method
Under Notice 2025-27, the instructions say a corporation with average annual AFSI under $800 million for the three preceding tax years that was not an applicable corporation in a prior year generally is not one and is not required to file Form 4626.
Safe harbor worksheet
The instructions include an Interim Simplified Method (Safe Harbor) Calculation Worksheet. They say not to complete it if the corporation already determined it is an applicable corporation.
Part V detail
The instructions say incomplete or nonspecific responses, including phrases such as "available upon request", are not sufficient responses in Part V.
Credit for prior year minimum tax
The instructions point to Form 8827, Credit for Prior Year Minimum Tax, Corporations, for a credit against regular tax and base erosion minimum tax for alternative minimum tax from prior years.
Recent developments
The About page lists updates to the 2025 instructions with additional interim guidance (20-FEB-2026) and a new simplified method for determining CAMT status (17-SEPT-2025).
Related forms
8827
Credit for Prior-Year Minimum Tax—Corporations
16 fields, 1 page
4626 Sch. A
Pro-Rata Share of Adjusted Net Income or Loss of CFCs Described in Section 56A(c)(3)
283 fields, 1 page
1120
U.S. Corporation Income Tax Return
481 fields, 6 pages
1118
Foreign Tax Credit—Corporations
1,263 fields, 12 pages
3800
General Business Credit
1,921 fields, 9 pages
1120-PC
U.S. Property and Casualty Insurance Company Income Tax Return
565 fields, 9 pages
Who files Form 4626?
Corporations complete the form, and it goes to the IRS attached to the corporation's own return. The instructions say a corporation files it, unless a filing exclusion applies, to determine whether it is an applicable corporation and, if so, to calculate CAMT.
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Questions about Form 4626
What is Form 4626 used for?
The instructions say it is used to determine whether a corporation is an applicable corporation under section 59(k) and to calculate the corporate alternative minimum tax under section 55 for applicable corporations.
Which corporations do not file Form 4626?
The instructions list S corporations, regulated investment companies, real estate investment trusts, tax-exempt entities with no unrelated business taxable income, and corporations not applicable under a simplified method they choose to apply.
What is the AFSI test?
The instructions say a corporation meets the general AFSI test when its average annual AFSI for the prior 3-tax-year period exceeds $1 billion. An FPMG member also faces a $100 million test.
What rate does Part II use?
Line 7 of Part II multiplies AFSI by 15% (0.15). The CAMT foreign tax credit is then subtracted to get the tentative minimum tax.
Where does the tax from line 13 go?
The form says to enter it on Form 1120, Schedule J, line 3, or the appropriate line of the corporation's income tax return.
Is Form 4626 filed separately?
No. The form says to attach it to the tax return, filed by that return's due date including extensions.
What is Item C?
Item C is new for 2025. It asks whether the corporation already determined it is an applicable corporation in current or prior years. If Yes, Part I is skipped.