Recommended by IRS
About Form, 1120 U.S. Corporation Income Tax ReturnInformation about Form, 1120 U.S. Corporation Income Tax Return, including recent updates, related forms and instructions on how to file.
Form 1120
PDF
PDF version of Form 1120.
Instructions for Form 1120
PDF
Instructions explaining how to file Form 1120.
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SOI Tax Stats - Table 13 - Corporation returns with net income, other than Forms 1120-REIT, 1120-RIC and 1120S
Table 13: Corporation Returns With Net Income, Other Than Forms 1120-REIT, 1120-RIC, and 1120S
Corporate Complete Report
About IRS
Tax Professionals
2023 valid XML schemas and business rules for 1120, 1120-F and 1120-S Modernized e-File (MeF)
The 1120x TY2023 webpage provides information to software developers and/or transmitters about the release of schemas and business rules for tax year 2023.
Software Development
Software Developers
2022 valid XML schemas and business rules for 1120, 1120-F, and 1120-S Modernized e-File (MeF)
The Modernized eFile XML Schemas and Business rules page provides information to software developers and/or transmitters about the release of release memos and miscellaneous tax year 2022 information.
Software Development
Software Developers
Form 8879-CORP, Form 8879-CORP, E-file Authorization for Corporations
A corporate officer and an electronic return originator (ERO) use Form 8879-CORP, E-file Authorization for Corporations, when the corporate officer wants to use a personal identification number (PIN) to electronically sign a corporation’s electronic income tax return and, if applicable, consent to electronic funds withdrawal.
Forms and Instructions
Form 8453-CORP, Form 8453-CORP, E-file Declaration for Corporations
Use Form 8453-CORP, Form 8453-CORP, E-file Declaration for Corporations to authenticate an electronic Form 1120, U.S. Corporation Income Tax Return; Form 1120-F, U.S. Income Tax Return of a Foreign Corporation; or Form 1120-S, U.S. Income Tax Return for an S Corporation, authorize the ERO, if any, to transmit via a third-party transmitter, authorize the intermediate service provider (ISP) to transmit via a third-party transmitter if you are filing online (not using an ERO), and provide the corporation’s consent to directly deposit any refund and/or authorize an electronic funds withdrawal for payment of federal taxes owed.
Forms and Instructions
Large Corporate Compliance Program
This page contains information relevant to the Large Corporate Compliance (LCC) Program administered by the Large Business and International (LB&I) division.
General Information
Corporations
Corporate executive compliance
The Internal Revenue Service is taking steps to improve tax compliance by corporations and their executive employees. One area of emphasis is executive compensation, for which audit technique guides have been developed for use by agents in examining tax returns filed by corporations and executives.
General Information
Corporations
About Form 1120-S, U.S. Income Tax Return for an S Corporation
Information 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 is used by corporations that elect to be S corporations to report income, deductions, gains, losses, etc.
General Information
Corporations
Golden Parachute Payments Corporate Form 1120 Examination Flowchart
Golden Parachute Payments Corporate Form 1120 Examination Flowchart
About IRS
SOI Tax Stats - Table 8 - Returns of active corporations, Form 1120-A
Table 8: Returns of Active Corporations, Form 1120-A
About IRS
Tax Professionals