IRS Form 8879‑Corp – Fillable PDF Signature Authorization

Form 8879‑Corp is the IRS e‑file signature authorization used by corporations, S corporations, and certain other entities to sign their income tax return (Form 1120, 1120‑S, etc.). Instead of printing, signing, and mailing a paper copy, you can now complete the form instantly with Formize’s fillable PDF tool.

What Is Form 8879‑Corp?

This two‑page PDF authorizes the IRS to accept an electronic signature for the corporate tax return. It must be signed by an authorized officer (usually the president, CEO, or a partner) and the paid‑preparer, if applicable.

How to Fill Out Form 8879‑Corp Online

Follow the simple steps below – no PDF editor required. Just click the button on this page and let the Formize PDF Filler load.

Common Mistakes to Avoid

• Leaving the "Date Signed" field blank. The IRS rejects unsigned forms.
• Using the wrong tax year. Verify the year at the top of the form.
• Signing with a handwritten signature image. Use the built‑in electronic signature feature.
• Incorrect EIN. Double‑check the employer identification number.

Where to Submit the Completed Form

After you finish, download the signed PDF and attach it to your e‑file submission through your tax software or send it to your paid‑preparer. The IRS does not accept a separate mailed copy unless you are filing a paper return.

Need help? Review the official IRS instructions for Form 8879‑Corp.