Form 8879-C IRS e-file Signature Authorization for Form 1120-2026

1. Click ‘Get Form’ to open it in the editor.
2. Begin by entering the corporation's name and employer identification number at the top of the form.
3. In Part I, input the total income, taxable income, total tax, amount owed, and overpayment as reported on Form 1120. Ensure all amounts are in whole dollars.
4. Proceed to Part II where the corporate officer must declare their authority and review the information. They should check either to authorize the ERO to enter their PIN or choose to enter it themselves.
5. In Part III, have the officer sign and date the form. The officer should also include their title for verification purposes.

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