Form 8879-S — IRS e-file Signature Authorization for Form 1120-S

Official source: IRS Forms, Instructions & Publications (https://www.irs.gov/pub/irs-pdf/f8879s.pdf), retrieved 2026-10-03. U.S. Government work (17 U.S.C. § 105).

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Under penalties of perjury, I declare that I am an officer of the above corporation and that I have examined a copy of the corporation’s 2021 electronic income tax return and accompanying schedules and statements and to the best of my knowledge and belief, it is true, correct, and complete. I further declare that the amounts in Part I above are the amounts shown on the copy of the corporation’s electronic income tax return. I consent to allow my electronic return originator (ERO), transmitter, or intermediate service provider to send the corporation’s return to the IRS and to receive from the IRS (a) an acknowledgement of receipt or reason for rejection of the transmission, (b) the reason for any delay in processing the return or refund, and (c) the date of any refund. If applicable, I authorize the U.S. Treasury and its designated Financial Agent to initiate an electronic funds withdrawal (direct debit) entry to the financial institution account indicated in the tax preparation software for payment of the corporation’s federal taxes owed on this return, and the financial institution to debit the entry to this account. To revoke a payment, I must contact the U.S. Treasury Financial Agent at 888-353-4537 no later than 2 business days prior to the payment (settlement) date. I also authorize the financial institutions involved in the processing of the electronic payment of taxes to receive confidential information necessary to answer inquiries and resolve issues related to the payment. I have selected a personal identification number (PIN) as my signature for the corporation’s electronic income tax return and, if applicable, the corporation’s consent to electronic funds withdrawal.

Officer’s PIN: check one box only

I authorize

ERO firm name

on the corporation’s 2021 electronically filed income tax return.

to enter my PIN

as my signature

Don’t enter all zeros

As an officer of the corporation, I will enter my PIN as my signature on the corporation’s 2021 electronically filed income tax return.

Officer’s signature ^▶ Date ^▶ Title ^▶

Part III Certification and Authentication

ERO’s EFIN/PIN. Enter your six-digit EFIN followed by your five-digit self-selected PIN.

Don’t enter all zeros

I certify that the above numeric entry is my PIN, which is my signature on the 2021 electronically filed income tax return for the corporation indicated above. I confirm that I am submitting this return in accordance with the requirements of Pub. 3112, IRS e-file Application and Participation, and Pub. 4163, Modernized e-File (MeF) Information for Authorized IRS e-file Providers for Business Returns.

ERO’s signature ^▶ Date ^▶

ERO Must Retain This Form — See Instructions Don’t Submit This Form to the IRS Unless Requested To Do So

For Paperwork Reduction Act Notice, see instructions. Cat. No. 37252K Form 8879-S (2021)

Form 8879-S (2021) Page 2

Future Developments

For the latest information about developments related to Form 8879-S and its instructions, such as legislation enacted after they were published, go to www.irs.gov/Form8879S . Purpose of Form

A corporate officer and an electronic return originator (ERO) use Form 8879-S when the corporate officer wants to use a personal identification number (PIN) to electronically sign an S corporation’s electronic income tax return and, if applicable, consent to electronic funds withdrawal. A corporate officer who doesn’t use Form 8879-S must use Form 8453-S, U.S. S Corporation Income Tax Declaration for an IRS e-file Return. For more information, see the instructions for Form 8453-S.

Don’t send this form to the IRS. The ERO must retain Form 8879-S. ERO Responsibilities

The ERO must:

• Enter the name and employer identification number of the corporation at the top of the form;

• Complete Part I using the amounts (zero may be entered when appropriate) from the corporation’s 2021 income tax return;

• Enter on the authorization line in Part II the ERO firm name (not the name of the individual preparing the return) if the ERO is authorized to enter the officer’s PIN;

• Give the officer Form 8879-S for completion and review by hand delivery, U.S. mail, private delivery service, email, Internet website, or fax; and

• Complete Part III, including a signature and date.

The ERO must receive the completed and signed Form

CAUTION the electronic return is

transmitted (or released for transmission).

Officer Responsibilities

The corporate officer must:

• Verify the accuracy of the corporation’s income tax return;

• Check the appropriate box in Part II to either authorize the ERO to enter the officer’s PIN or choose to enter it in person;

• Indicate or verify his or her PIN when authorizing the ERO to enter it (the PIN must be five digits other than all zeros);

• Sign, date, and enter his or her title in Part II; and

• Return the completed Form 8879-S to the ERO by hand delivery, U.S. mail, private delivery service, email, Internet website, or fax.

The corporation’s return won’t be transmitted to the IRS until the ERO receives the officer’s signed Form 8879-S. Important Notes for EROs

• Don’t send Form 8879-S to the IRS unless requested to do so. Retain the completed Form 8879-S for 3 years from the return due date or IRS received date, whichever is later. Form 8879-S can be retained electronically in accordance with the recordkeeping guidelines in Rev. Proc. 97-22, which is on page 9 of Internal Revenue Bulletin 1997-13 at www.irs.gov/pub/irs-irbs/irb97-13.pdf.

• Enter the corporate officer’s PIN on the input screen only if the corporate officer has authorized you to do so.

• Provide the officer with a copy of the signed Form 8879-S upon request.

• Provide the officer with a corrected copy of the Form 8879-S if changes are made to the return (for example, based on the officer’s review).

• See Pub. 4163 for more information.

Paperwork Reduction Act Notice. We ask for the information on this form to carry out the Internal Revenue laws of the United States. You are required to give us the information. We need it to ensure that you are complying with these laws and to allow us to figure and collect the right amount of tax.

You aren’t required to provide the information requested on a form that is subject to the Paperwork Reduction Act unless the form displays a valid OMB control number. Books or records relating to a form or its instructions must be retained as long as their contents may become material in the administration of any Internal Revenue law. Generally, tax returns and return information are confidential, as required by Internal Revenue Code section 6103.

The time needed to complete and file this form will vary depending on individual circumstances. The estimated burden for business taxpayers filing this form is approved under OMB control number 1545-0123 and is included in the estimates shown in the instructions for their business income tax return.

Comments. You can send us comments from www.irs.gov/FormComments. Or you can write to the Internal Revenue Service, Tax Forms and Publications Division, 1111 Constitution Ave. NW, IR-6526, Washington, DC 20224. Don’t send the form to this office.