Form 8453-CORP is the IRS declaration a corporate officer signs to authenticate an e-filed corporate income tax return. The officer signs a physical copy, the signed page is scanned to PDF, and that PDF is transmitted with the electronic return through tax software. It is not mailed.1Internal Revenue Service. Form 8453-CORP (Rev. December 2025)
What the Form Does
When a corporation e-files Form 1120, 1120-F, 1120-H, or 1120-S, the IRS needs proof that an authorized officer approved the submission. Form 8453-CORP provides it. Signing constitutes a declaration under penalties of perjury that the return is true, correct, and complete.1Internal Revenue Service. Form 8453-CORP (Rev. December 2025)
The same form does two other jobs. It authorizes the Electronic Return Originator (ERO) or Intermediate Service Provider to transmit the return, and it handles the money side: the officer uses it to consent to direct deposit of a refund or to authorize an electronic funds withdrawal for taxes owed.2Internal Revenue Service. About Form 8453-CORP, E-file Declaration for Corporations
Form 8453-CORP or Form 8879-CORP
Corporations have two ways to authenticate an e-filed return. Form 8453-CORP uses a scanned handwritten signature. Form 8879-CORP uses a PIN that the officer enters or authorizes the ERO to enter.3Internal Revenue Service. About Form 8879-CORP, E-File Authorization for Corporations
Either satisfies the IRS. The return is not considered filed until one of the two accompanies it.1Internal Revenue Service. Form 8453-CORP (Rev. December 2025) Most tax software defaults to the PIN method because it skips the scanning step. Form 8453-CORP is the fallback.
Who Can Sign
Federal law limits signing of a corporate return to the president, vice president, treasurer, assistant treasurer, chief accounting officer, or any other officer the corporation has specifically authorized to act in that capacity.4Office of the Law Revision Counsel. 26 US Code 6062 – Signing of Corporation Returns The same rule applies here. If a fiduciary is handling the return for the corporation, the fiduciary signs.
How to Complete the Form
Header and Part I
Enter the corporation’s legal name, Employer Identification Number, and tax year. Part I asks for one figure in whole dollars: total income from the applicable line of the return. On a standard Form 1120, that is line 11.1Internal Revenue Service. Form 8453-CORP (Rev. December 2025) The IRS uses this number to cross-check against the electronic return, so it needs to match.
Part II
Part II is where the officer signs and dates. Before signing, the officer checks one of three payment boxes:1Internal Revenue Service. Form 8453-CORP (Rev. December 2025)
- Box A consents to direct deposit of the corporation’s refund as designated on the return.
- Box B declines direct deposit, or applies if the corporation is not receiving a refund.
- Box C authorizes the U.S. Treasury to initiate an electronic funds withdrawal from the account specified in the tax software. To cancel that payment, the corporation must call the Treasury Financial Agent at 888-353-4537 no later than two business days before the scheduled payment date.
The signature is a declaration under penalties of perjury that the amounts in Part I match the electronic return and that the return itself is true, correct, and complete to the best of the officer’s knowledge.
When a New Signature Is Required
If the ERO changes the electronic return after the officer has already signed, whether before transmission or after correcting a rejection, the officer must sign a new Form 8453-CORP once either threshold is crossed:1Internal Revenue Service. Form 8453-CORP (Rev. December 2025)
- Total income differs from the amount on the electronic return by more than $150.
- Taxable income differs from the amount on the electronic return by more than $100.
Changes below both thresholds do not require a new signature. Crossing either one means the officer reviews the revised figures and signs a corrected form before transmission.
How the Form Is Filed
The officer signs a physical copy. The signed page is scanned to PDF. The PDF is attached to the electronic return and transmitted with it through the tax software.1Internal Revenue Service. Form 8453-CORP (Rev. December 2025) The instructions specifically say not to file paper copies.
This is where Form 8453-CORP is sometimes confused with the individual Form 8453. The individual version is a paper transmittal mailed to the Austin Submission Processing Center. The corporate version is not. If tax software prompts you to print and mail Form 8453-CORP, the setup is wrong.
Which Corporations Have to E-File
A corporation must file Form 1120 electronically if it is required to file at least 10 returns of any type during the calendar year ending with or within its taxable year. That count includes W-2s, 1099s, employment tax returns, excise tax returns, and income tax returns.5eCFR. 26 CFR 301.6011-5 – Required Use of Electronic Form for Corporate Income Tax Returns
For controlled groups, the count is aggregated across all member corporations. A parent with several subsidiaries can cross the threshold even when no single entity files 10 returns on its own. Any corporation that e-files needs either Form 8453-CORP or Form 8879-CORP to authenticate the submission.
Record Retention
The ERO should keep the signed Form 8453-CORP, along with evidence that the PDF was attached to the electronic return, for at least three years from the return’s due date or the date the IRS received it, whichever is later. The corporation should keep its own copy for the same period with the rest of that year’s tax records.