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Information about Form 1120, U.S. Corporation Income Tax Return, including recent updates, related forms and instructions on how to file. Use this form to report the income, gains, losses, deductions, credits, and to figure the income tax liability of a corporation.

Find out what takes place in the formation of a corporation and the resulting tax responsibilities and required forms.

Get a list of IRS forms for corporations.

Information about Form 8453-CORP, E-file Declaration for Corporations, including recent updates, related forms, and instructions on how to file. Form 8453-CORP is used to authenticate an electronic Form 1120, authorize an ERO or ISP to transmit via a third-party, and authorize a corporation's consent to direct deposit any refund or electronic funds withdrawal for payment of federal taxes owed.

Information about Form 8879-CORP, E-File Authorization for Corporations, including recent updates, related forms and instructions on how to file. A corporate officer and an electronic return originator (ERO) use this form 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.

Form 1120-POL – Final Return (527 organizations).

Overview of information reported on Form 1120-POL.

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.

Political Organization Filing Requirements: Deductions Allowed on Form 1120-POL

Find out where to mail your completed form.