IRS Form 8879-CORP – E-file Authorization for Corporations

IRS Form 8879-CORP – Corporations filing Form 1120, 1120-S, 1120-F, or other 1120-series returns electronically must authorize their tax preparer (Electronic Return Originator, or ERO) to submit the return using a Personal Identification Number (PIN) as the corporate officer’s signature. That authorization comes on IRS Form 8879-CORP — E-file Authorization for Corporations.

This one-page form is the standard way most corporations and their accountants handle the electronic signature requirement for business returns. It also allows consent for electronic funds withdrawal (direct debit) if the corporation owes taxes.

What Is IRS Form 8879-CORP?

Form 8879-CORP is the official IRS document that lets a corporate officer:

• Use a 5-digit PIN to electronically sign the corporation’s income tax return.
• Authorize the ERO to transmit the return to the IRS and receive acknowledgments, rejection notices, or refund information.
• (If applicable) Consent to electronic payment of any balance due via direct debit from the corporation’s bank account.

It applies to:

• Form 1120 (C corporations)
• Form 1120-S (S corporations)
• Form 1120-F (foreign corporations)
• Form 1120-H (homeowners associations)
• Other 1120-series returns that support e-filing

Current revision: December 2024 (posted December 2024). The form was updated to cover additional corporations now eligible for e-filing.

Download the latest form:
Form 8879-CORP (Rev. December 2024) PDF

Who Uses Form 8879-CORP?

• Corporate officer (president, vice president, treasurer, etc.) who is authorized to sign the return.
• Electronic Return Originator (ERO) — usually the CPA, tax preparer, or software provider handling the e-filing.

The officer reviews the completed return, signs Form 8879-CORP, and returns it to the ERO. The ERO then enters the officer’s PIN (or lets the officer enter it) and submits the return.

Important: If the corporation does not want to use the PIN method, the officer must instead complete Form 8453-CORP (scanned signature document) and the ERO attaches it as a PDF to the e-filed return.

Step-by-Step: How to Complete Form 8879-CORP?

The form has three parts and takes only a few minutes once the return is ready.

Part I – Verification of Income Amounts

Enter (in whole dollars):

• Line 1: Form 1120, line 11 (Total income)
• Line 2: Form 1120-F, Section II, line 11
• Line 3: Form 1120-S, line 6 (Total income (loss))
• Line 4: Any other 1120-series form + the corresponding total income line

Why? This line-item match protects both the officer and the ERO. If the amounts later change by more than $150 (total income) or $100 (taxable income), a new authorization may be required.

Part II – Officer’s Declaration and Signature

The officer must:

1. Review a complete copy of the electronic return and all schedules.
2. Check one box only for the PIN:
   • “I authorize [ERO firm name] to enter my PIN …” (most common)
   • “As an officer of the corporation, I will enter my PIN …”
3. Enter a 5-digit PIN (cannot be all zeros).
4. Sign, date, and enter title (e.g., President, Treasurer).

Declaration under penalties of perjury — the officer attests the return is true, correct, and complete.

Electronic funds withdrawal consent (optional but common)
If the corporation owes tax and wants to pay electronically, the officer authorizes the U.S. Treasury to debit the bank account shown in the tax software. To cancel, call 888-353-4537 at least 2 business days before the payment date.

Part III – ERO’s Certification

The ERO enters:

• Their 6-digit EFIN + 5-digit self-selected PIN (11 digits total, cannot be all zeros).
• Signs and dates the form.

The ERO certifies compliance with IRS e-file rules (Publications 3112 and 4163).

Key Rules and Deadlines

• Do NOT send Form 8879-CORP to the IRS unless specifically requested.
• ERO retention: Keep the signed form (and a copy of the return) for 3 years from the return due date (or extended due date) or the IRS received date, whichever is later. The officer may request a copy at any time.
• Timing: The ERO cannot transmit the return until they have the signed Form 8879-CORP.
• E-signatures: Many professional tax software platforms now support electronic signatures on Form 8879-CORP with identity verification. Handwritten signatures sent by mail, fax, secure email, or portal are also accepted.
• Changes after signing: If the return is materially altered after the officer signs, a new Form 8879-CORP (or 8453-CORP) is usually required.

Common Mistakes to Avoid

• Entering all zeros as a PIN.
• Failing to give the officer a complete copy of the return to review.
• Mismatching the income amounts in Part I.
• Transmitting the return before receiving the signed authorization.
• Not updating the form when the December 2024 revision is required.

Frequently Asked Questions

Do corporations have to e-file?
Many do (especially larger ones or those with 10+ returns in a year). Check the latest IRS e-file mandates for your entity type and size.

Can the officer sign electronically?
Yes — if the ERO’s software supports tamper-proof e-signatures with identity verification. Otherwise, a handwritten signature is fine.

What if the corporation owes tax and wants to pay by check instead?
Simply do not check the electronic funds withdrawal authorization.

Where can I find the official instructions?
All instructions are printed on the form itself or in Publication 4163 (Modernized e-File Information for Authorized IRS e-file Providers for Business Returns).

Is there a separate form for S corporations?
No — Form 8879-CORP now covers both C and S corporations (as well as 1120-F and others). The older Form 8879-S is no longer used for new filings.

Final Tips for Smooth Corporate E-Filing

1. Always give the corporate officer the full return package before they sign Form 8879-CORP.
2. Double-check the income verification lines in Part I.
3. Keep excellent records — the ERO’s copy of the signed form is your proof of authorization.
4. Use the latest December 2024 revision of the form.

Official IRS Resources

• About Form 8879-CORP
• Form 8879-CORP (Rev. Dec. 2024) PDF
• Publication 4163 (for EROs)
• Publication 3112 (IRS e-file Application and Participation)

By properly completing and retaining Form 8879-CORP, corporations and their tax professionals ensure fast, compliant electronic filing while meeting all IRS signature and authorization requirements. If your CPA or tax software provider hasn’t already provided this form, ask for it once the return is ready for review.

Need help with corporate e-filing or have questions about the 2024/2025 tax year? Consult your tax professional or visit IRS.gov for the most current guidance.