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Timely, properly completed Form 7004 grants calendar-year C corporations six months.

The Claim

A calendar-year C corporation can obtain an automatic six-month extension to file its federal income tax return by timely filing Internal Revenue Service Form 7004.

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The Short Version

Timely filing a properly completed Form 7004 gives a calendar-year C corporation an automatic six-month filing extension. Current IRS instructions and Treasury regulations support that period. The five-month transition language for pre-2026 tax years did not prevent Treasury from granting six months under its separate statutory authority.

Caveats

  • The extension applies to filing the return, not paying tax; payment generally remains due by the original return deadline.
  • Form 7004 must be timely and properly completed, including a reasonable estimate of tax liability.
  • The five-month statutory transition language for certain pre-2026 tax years can cause confusion, but Treasury regulations grant a six-month extension.

The Receipts

  1. 26 CFR Part 1 - Extension of Time for Filing Returns

    ecfr.gov

  2. Instructions for Form 7004 (12/2025) | Internal Revenue Service

    irs.gov

  3. Instructions for Form 7004 (Rev. December 2025)

    irs.gov

  4. Form 7004 (Rev. December 2025)

    irs.gov

  5. 26 USC 6081: Extension of time for filing returns

    uscode.house.gov

  6. govinfo.gov

    govinfo.gov

  7. eCFR :: 26 CFR 1.6081-3 -- Automatic extension of time for filing corporation income tax returns.

    ecfr.gov

  8. 26 CFR § 1.6081-3 - Automatic extension of time for filing ...

    law.cornell.edu

  9. About Form 7004, Application for Automatic Extension of Time To ...

    irs.gov

  10. 26 USC Subtitle F, CHAPTER 61, Subchapter A, PART VI: EXTENSION OF TIME FOR FILING RETURNS

    uscode.house.gov

+ 8 more sources — see the full list on Lenz

Filed Under

C CorporationInternal Revenue Service Form 7004IRS

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