Accounting & tax

IRS Form 8879: e-file Signature Authorization (2026)

Form 8879 is the IRS e-file Signature Authorization — it's how you authorize your tax preparer (an Electronic Return Originator) to electronically file your individual return on your behalf.

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Jason Smith
Jason Smith, Account Executive at ClientCollect
August 11, 2026
Updated August 2026

What Form 8879 is for

Form 8879 is the e-file signature authorization you sign so your tax preparer — an Electronic Return Originator (ERO) — can transmit your return to the IRS electronically. It's the electronic equivalent of signing the paper return, and you're asked for it after the return is finished and before it's filed.

Before you sign

Review the figures your preparer carries onto the form: - Adjusted gross income (AGI), - Total tax, and - Refund or amount you owe.

Make sure they match the return you reviewed. Your signature authorizes the ERO to file that return and confirms it's accurate to the best of your knowledge. On a joint return, both spouses must sign.

Common mistakes to avoid

  • Signing before you've actually reviewed the return — the numbers on the 8879 should tie out to your copy.
  • Only one spouse signing a joint return. Both signatures are required.
  • Missing the PIN. The form uses a Self-Select or Practitioner PIN to sign electronically.

What happens next

Your preparer keeps the signed 8879 on file (they don't mail it to the IRS unless asked) and transmits your return. You'll get an acknowledgment once the IRS accepts it — keep your copy with your tax records.

Frequently asked questions

What am I actually signing on Form 8879?

You're confirming the return is accurate to the best of your knowledge and authorizing your preparer to e-file it.

Do both spouses sign on a joint return?

Yes — a jointly filed return needs both spouses to sign Form 8879.

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