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2025›Instructions for Form 1120-S

Reminders

Instruction 1120-S — Instructions for Form 1120-S, U.S. Income Tax Return for an S Corporation · 2026-10-03 edition · updated 2026-10-04 · United States

Election by a small business corporation. Don’t file Form 1120-S unless the corporation has filed or is attaching Form 2553, Election by a Small Business Corporation. For details, see the Instructions for Form 2553.

Form 4255 reporting. Instead of passing through to the shareholders, certain amounts from Form 4255 are required to be reported directly on Form 1120-S. See Line 23c, later.

Qualified conservation contribution. No federal income tax deduction is allowed for a conservation contribution made by an S corporation after December 29, 2022, if the amount of the contribution exceeds 2.5 times the sum of each ultimate member’s relevant basis. See Contributions of property , later.

Section 6418 transfer. If a portion of a section 48, 48C, or 48E credit has been transferred under section 6418, do NOT use

Instructions for Form 1120-S (2025) Catalog Number 11515K Jan 15, 2026 Department of the Treasury Internal Revenue Service www.irs.gov

line 17d, code D, to report basis information. See Section 6418 transfers of credits under section 48, 48C, or 48E , later.

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▸Contents — Instruction 1120-S — Instructions for Form 1120-S, U.S. Income Tax Return for an S Corporation
Instruction 1120-S — Instructions for Form 1120-S, U.S. Income Tax Return for an S Corporation

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