Wednesday, Sep 2, 2026 The claims desk. Receipts included. POWERED BY LENZ
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Domestic calendar-year C corporations generally file federal returns on Form 1120.

The Claim

A calendar-year C corporation files its federal income tax return on Form 1120.

The Short Version

The statement accurately describes the standard federal filing rule for a domestic calendar-year C corporation. IRS instructions establish that such corporations generally use Form 1120. Limited exceptions exist for corporations required or permitted to file specialized returns, but they do not materially undermine the ordinary rule.

Caveats

  • Some corporations must or may file a specialized return instead of Form 1120.
  • The statement implicitly concerns domestic C corporations; foreign corporations generally use Form 1120-F.
  • Calendar-year status affects the filing period and deadline, not the basic return classification.

The Receipts

  1. Instructions for Form 1120 (2025) | Internal Revenue Service

    irs.gov

  2. 2025 Instructions for Form 1120

    irs.gov

  3. 2024 Instructions for Form 1120

    irs.gov

  4. About Form 1120, U.S. Corporation Income Tax Return

    irs.gov

  5. 1120 IRS filing deadlines and electronic filing information

    thomsonreuters.com

  6. What Is a 1120 Tax Form? Facts and Filing Tips for Small Businesses 2026 - FreshBooks

    freshbooks.com

  7. When Is Corporation Tax Due to the IRS? - LegalClarity

    legalclarity.org

  8. IRS Form 1120 Instructions: Step-by-Step Guide for Corporate Tax Returns

    inkle.ai

  9. Tax Form 1120: Essential Guide for Corporate Filings | finally

    finally.com

  10. IRS Form 1120: Requirements, Schedules, and Deadlines - LegalClarity

    legalclarity.org

Filed Under

C CorporationForm 1120

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