Wednesday, Sep 2, 2026 The claims desk. Receipts included. POWERED BY LENZ
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An S corporation generally files Form 1120-S for its federal return.

The Claim

An S corporation files its federal income tax return on Internal Revenue Service Form 1120.

The Short Version

S corporations generally file their federal returns on Form 1120-S, not Form 1120. IRS materials explicitly identify Form 1120-S as the “U.S. Income Tax Return for an S Corporation,” while plain Form 1120 is a distinct return generally associated with C corporations. Omitting the “-S” changes the form being identified and makes the statement incorrect.

Caveats

  • Form 1120 and Form 1120-S are legally distinct tax forms.
  • The “-S” suffix is material and cannot be treated as shorthand.
  • Form 1120 is generally the corporate income tax return used by C corporations.

The Receipts

  1. About Form 1120-S, U.S. Income Tax Return for an S ...

    irs.gov

  2. Instructions for Form 1120-S (2025) | Internal Revenue Service

    irs.gov

  3. 2025 Form 1120-S

    irs.gov

  4. 2025 Instructions for Form 1120-S

    irs.gov

  5. 26 USC 6037: Return of S corporation

    uscode.house.gov

  6. What is Form 1120-S? A Guide to the US Income Tax Return ...

    turbotax.intuit.com

  7. S-Corp Taxes: An Introductory Guide - TurboTax - Intuit

    turbotax.intuit.com

  8. Complete Guide To IRS Form 1120: Instructions and Tips

    commenda.io

  9. Form 1120-S

    bamboohr.com

Filed Under

Form 1120IRS

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