Recommended by IRS
About Form 1120-S, U.S. Income Tax Return for an S CorporationInformation about Form 1120-S, U.S. Income Tax Return for an S Corporation, including recent updates, related forms, and instructions on how to file.
Form 1120-S
PDF
PDF version of Form 1120-S.
Instructions for Form 1120-S
PDF
Instructions explaining how to file Form 1120-S.
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Frequently asked questions: Do I need a PTIN?
Who needs a PTIN, sample scenarios, SSN requirements, and non-signing/supervised preparers.
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Tax Professionals
SIMPLE IRA plan
Find out about the Savings Incentive Match Plan for Employees (SIMPLE). The plan allows employees and employers to contribute to traditional IRAs.
General Information
Administrators
SOI tax stats: What's new
Brief descriptions of recent major additions to tax stats are shown here.
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Tax Professionals