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Form 4626: Alternative Minimum Tax—Corporations
IRS Form 4626 is used to determine if a corporation is an applicable corporation under section 59(k) and to calculate CAMT under section 55 for corporations. A key calculation involves checking if the tentative minimum tax exceeds the sum of regular income tax plus the base erosion minimum tax.
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IRS Form 4626 - Alternative Minimum Tax—Corporations
IRS Form 4626 is used to determine if a corporation is an applicable corporation under section 59(k) and to calculate CAMT under section 55 for corporations. A key calculation involves checking if the tentative minimum tax exceeds the sum of regular income tax plus the base erosion minimum tax.
Risk Radar
Scan points- 1If applicable, ensure you check 'Yes' for Item C before skipping Part I; otherwise, you may skip necessary determination steps.
- 2Failing to check 'Yes' for Item C when already determined applicable, causing Part I omission.
- 3Not reporting required information in columns (a), (b), or (c) of Part I for the 3-tax-year period.
- 4Omitting the attachment of Form 4626 to the corporation’s current income tax return.
- 5Failing to complete Part V when the corporation is a member of an FPMG (Foreign-Parented Multinational Group).
Plain English
This form tells the IRS whether a corporation is subject to the Alternative Minimum Tax (AMT). If it is, Form 4626 calculates how much extra tax that company owes. This helps ensure corporations pay at least a minimum amount of federal income tax.
Submission Date
- Filing date: 2026-02-02 14:10:50
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use this form when a corporation needs to determine if it is an applicable corporation under section 59(k) and calculate CAMT under section 55.
- Do not use this form when a filing exclusion applies, as the corporation would be exempt from filing Form 4626.
- Check Form 8827 instead when taking a credit against regular tax or base erosion minimum tax for prior year alternative minimum tax.
Form selector
Use this form or another form?
Filing consolidated return
CAMT is calculated on a consolidated basis for an affiliated group filing under section 1501.
✓ Confirm the consolidation method used.
Tax-exempt entity (Section 511)
Adjustments are required so that only items from the corporation’s unrelated trade or business activities are included in AFSI.
✓ Ensure all unrelated debt-financed income is accounted for.
Controlled Group Member
If the corporation is a member of a controlled group, it must complete Part V listing details for each member.
✓ Verify that all members are listed and their financial statements match.
Deadline or filing window
The filing trigger is generally the corporation’s current tax year. The form must be attached to the corporation’s income tax return for that current tax year. No specific extension dates are provided in the official source excerpts.
Checklist
What you need before filling it out
Purpose
Determine applicable status under section 59(k) and calculate CAMT under section 55 · General Instructions
Filing Requirement
A corporation must file unless a filing exclusion applies · Who Must File (p.1)
Controlled Group Status
Check 'Yes' or 'No' in Item A and complete Part V if 'Yes' · Form p.1 / Item A
Covered Benefit Plan Adjustment
Enter adjustments for covered benefit plan income/deductions (Sections 56A(c)(11)(A)(i)–(iii)) · Instructions p.11
Tax-Exempt Entity AFSI Rule
Adjustments must only include unrelated trade or business activities subject to section 512(b) modifications · Line 2m (p.11)
Foreign Tax Treatment
Proposed Regulations section 1.56A-8(d)(1) describes when a foreign tax is taken into account · Instructions p.1
Before you submit
- 1Confirm the corporation's name and EIN are correctly entered on Form 4626.
- 2Verify whether Item A indicates if the filing corporation is a member of a controlled group.
- 3If Item A is 'Yes,' confirm that Part V has been completed listing all members, their names, EINs, and financial statement income/loss.
- 4Review Line 11 adjustments to ensure they correctly increase or decrease AFSI based on covered benefit plan provisions (Sections 56A(c)(11)(A)(i)–(iii)).
- 5For tax-exempt entities, confirm that Line 2m adjustments restrict AFSI calculation only to unrelated trade or business activities.
- 6If applicable, check the treatment of foreign taxes according to Proposed Regulations section 1.56A-8(d)(1).
- 7Ensure the form is attached to the corporation’s income tax return (or exempt organization business income tax return) and filed by the due date.
How to file this form
- 1Complete Item A on Form 4626, indicating whether the corporation is a member of a controlled group.
- 2If applicable, complete Part V to list all members of the controlled group treated as a single employer.
- 3Enter required adjustments on Line 11 for covered benefit plan income and deductions, following the relevant sections of the Internal Revenue Code.
- 4Complete Line 2m if the corporation is tax-exempt, ensuring AFSI only reflects unrelated trade or business activities subject to section 512(b) modifications.
- 5Attach Form 4626 to the corporation’s income tax return (or exempt organization business income tax return).
- 6File the completed Form 4626 by the due date of that income tax return, keeping a copy for records.
Known limitations
- 1A corporation does not need to complete Part II of Form 4626 if it does not meet the definition of an applicable corporation in Part I or has not been classified as one in a prior year.
- 2If an affiliated group files a consolidated return under section 1501, CAMT is calculated on a consolidated basis for that group.
- 3A corporation may use an optional interim simplified method to determine applicable corporation status; if this method is met, the corporation is not required to complete Form 4626.
- 4Taxpayers may rely on Notice 2025-46 until proposed regulations are issued.
Field map
Compact field-by-field guide
General Info
2 items
Full legal name and taxpayer identification number (SSN or EIN).
Current mailing address.
Details
2 items
Complete all applicable sections of this form according to the official IRS instructions.
Enter the relevant dollar amount if this form involves tax calculation.
Certification
1 items
Read and acknowledge any certifications required by this form.
Signatures
1 items
Sign and date. Unsigned forms cannot be processed.
Almost done reviewing the fields?
Fillable formOpen in Editor->The current edition is 20/25, and readers can find the latest information regarding Form 4626 at IRS.gov/Form4626. Item C was recently added to Form 4626.
What changed or needs a fresh check
- Edition date — confirm the revision reads 20/25.
- Form Title — confirm the title reads Alternative Minimum Tax—Corporations.
- OMB Number — confirm the number is 1545-0123.
- Filer's Name — ensure the correct name of the corporation is entered on Form 4626.
- EIN — verify that the Employer identification number (EIN) is accurately listed.
Quick Facts
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After you file
- 1Attach the completed Form 4626 to the corporation’s income tax return (or, if applicable, exempt organization business income tax return).
- 2File Form 4626 by the due date (including extensions) for the associated income tax return.
- 3Keep a copy of the filed Form 4626.
- 4Confirm that the revision date on the form reads 20/25.
Sources
- SRCInstructions p.1 — Form 4626 is used to determine if a corporation is an applicable corporation under section 59(k) and to calculate CAMT under section 55.
- SRCInstructions p.1 — A corporation must file Form 4626 unless a filing exclusion applies.
- SRCInstructions p.1 — Attach Form 4626 by the due date (including extensions) for the corporation’s income tax return or exempt organization business income tax return.
- SRCInstructions p.11 — Part II of Form 4626 is only completed if the tentative minimum tax exceeds the sum of the regular income tax plus the base erosion minimum tax.
- SRCInstructions p.11 — The tentative minimum tax for the tax year is the excess of 15% of AFSI for the tax year, over the CAMT FTC for the tax year.
- SRCForm p.1 — If the corporation does not meet the definition of applicable corporation in Part I or has not been classified as an applicable corporation in a prior year, do not complete Part II of Form 4626.
- SRCForm p.1 — Line 1a requires entering consolidated net income or loss if the AFS is a consolidated AFS for the current tax year.
- SRCForm p.1 — On Line 2b, if the aggregate pro-rata share of adjusted net income from controlled foreign corporations (CFCs) is zero or less, enter -0- and attach Schedule A (Form 4626).
- SRCInstructions p.3 — The purpose of Form 4626 includes clarifying the application of sections 108 and 1017 to troubled companies.
Common confusion points
Who must file this form?
A corporation must generally file Form 4626 unless a filing exclusion applies.
→ Check if any specific filing exclusion applies to your corporate entity.
When do I need to file it?
The due date is the same as the due date for the corporation’s income tax return (or exempt organization business income tax return).
→ Confirm this deadline with the main return instructions.
What does 'CAMT' apply if?'
CAMT applies if the tentative minimum tax for the tax year exceeds the sum of the regular income tax plus the base erosion minimum tax.
→ Verify your calculation meets this threshold before finalizing Part II.
How do I calculate the Tentative Minimum Tax?
It is the excess of 15% of Adjusted Financial Statement Income (AFSI) for the tax year, over the CAMT FTC for the tax year.
→ Ensure you have correctly calculated both AFSI and the CAMT FTC.
What if my AFS is consolidated?
Enter the consolidated net income or loss set forth on the consolidated AFS for the current tax year into Line 1a of Form 4626.
→ Make sure this figure includes net income or loss attributable to noncontrolling interests.
Do I need to complete Part II if my AFSI is zero or negative?
If your aggregate pro-rata share of adjusted net income from controlled foreign corporations (CFCs) is zero or less, you must enter -0- on Line 2b and attach Schedule A (Form 4626).
→ Check the specific instructions for special rules if completing this form for an FPMG.
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- The instructions mention Notice 2025-27 (I.R.B. 1615) and Notice 2025-28 (I.R.B. 316) for additional guidance.
Questions about IRS Form 4626
What is IRS Form 4626 used for?
This form tells the IRS whether a corporation is subject to the Alternative Minimum Tax (AMT). If it is, Form 4626 calculates how much extra tax that company owes. This helps ensure corporations pay at least a minimum amount of federal income tax.
Who must file IRS Form 4626?
A corporation must file Form 4626 unless a specific filing exclusion applies to it. These exclusions include S corporations and Real Estate Investment Trusts (REITs).
What information does IRS Form 4626 require?
The form collects information on the corporation's status, including whether it is part of an FPMG (Foreign-Parented Multinational Group) in Part V. It also reports required financial data for a 3-tax-year period in Part I.
When is IRS Form 4626 due?
The source does not specify a filing deadline date or period. The form must be attached to the corporation’s income tax return for the current tax year.
Where do I file IRS Form 4626?
The source does not list specific service centers, but it directs users to IRS.gov/Form4626 for future developments and general information regarding filing.
How do I complete IRS Form 4626?
First, check if the corporation has already determined it is an applicable corporation; if so, check 'Yes' and skip Part I. If not, complete Part I to determine applicability using data from the 3-tax-year period ending prior to the current tax year. Finally, calculate CAMT in Part II and attach the completed form to the income tax return.
What happens if IRS Form 4626 is filed incorrectly?
If a corporation is an applicable corporation but fails to file Form 4626, the calculation of its Alternative Minimum Tax (CAMT) may be incorrect or missed entirely.
Who must file this form?
A corporation must generally file Form 4626 unless a filing exclusion applies. Check if any specific filing exclusion applies to your corporate entity.
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