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2025›Instructions for Form 1120-S›Specific Instructions

Item G. Electing To Be an S Corporation

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

If “Yes,” attach Form 2553 if not already filed. Form 2553 must generally be filed no more than 2 months and 15 days after the beginning of the tax year the election is to take effect. A Form 2553 filed with Form 1120-S will generally be a late election. But with reasonable cause you may be able to request relief for the late election on Form 2553. See “Relief for Late Elections” in the Instructions for Form 2553.

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

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