IRS · United States

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Form 8879: IRS e-file Signature Authorization

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Quick answer

IRS Form 8879, IRS e-file Signature Authorization, is the form you sign to authorize your tax preparer — an Electronic Return Originator (ERO) — to e-file your federal return using a five-digit self-select PIN as your electronic signature. You review the return amounts shown in Part I, sign Part II, and return the form to your preparer. It is not sent to the IRS; the ERO keeps it on file. With JustFill you upload the blank IRS Form 8879 PDF, the AI auto-detects every field, you type or dictate your answers, and you download the completed form free.

Form
Form 8879
Issued by
IRS
Country
United States
Cost to fill
Free

What is Form 8879?

Your accountant just emailed you a Form 8879 to sign? IRS Form 8879 is the e-file Signature Authorization — the document that lets a tax professional electronically file your federal income tax return on your behalf. Part I shows key amounts from the return (adjusted gross income, total tax, refund or balance due) so you can verify them before anything is transmitted. Part II is your declaration and signature, where a five-digit self-select PIN acts as your electronic signature. JustFill turns the PDF into a fillable form in your browser — the AI auto-detects every field, you type or dictate your entries, sign, and download the completed Form 8879 free to send back to your preparer. It works even on scanned or flattened copies.

Who fills out Form 8879?

  • Taxpayers whose CPA, enrolled agent, or tax preparer e-files their federal return for them
  • Spouses on a joint return — both must sign the same Form 8879 before the return is transmitted
  • Clients of remote or online tax preparers who receive the form by email and need to complete it without a printer
  • Anyone whose preparer enters the taxpayer's PIN on their behalf — the form documents that authorization
  • Business owners signing the related 8879 series for entity returns prepared by a professional

Field-by-field breakdown

What each section of Form 8879 asks for. JustFill’s AI will detect these fields automatically when you upload the PDF — review the breakdown below so you know what to enter.

Header — Taxpayer name and SSN

Your name and Social Security Number exactly as they appear on the return; spouse name and SSN for joint returns.

Part I — Tax return information

Key amounts from the return: adjusted gross income, total tax, federal income tax withheld, refund, or amount you owe. Verify these match the return your preparer showed you.

Part II — Taxpayer declaration

Your declaration, under penalties of perjury, that you have reviewed the return and the amounts in Part I are correct.

Part II — Self-select PIN and authorization checkbox

Your five-digit PIN (any five digits except all zeros) and the checkbox stating whether you entered it yourself or authorize the ERO to enter it for you.

Part II — Signature and date

Your signature and date; spouse signs separately on a joint return.

Part III — Certification and authentication

Completed by the ERO: their EFIN/PIN, certification, signature, and date. You leave this section to your preparer.

Common mistakes to avoid

  • 1Signing before checking Part I — the whole point of Form 8879 is to verify the AGI, total tax, and refund or balance due against the actual return before it is e-filed.
  • 2Mailing the form to the IRS — Form 8879 goes back to your preparer, who must keep it on file for three years. The IRS only requests it if needed.
  • 3Forgetting the second signature on a joint return — both spouses must sign, each with their own five-digit PIN, before the ERO can transmit the return.

How JustFill helps you complete Form 8879

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Frequently asked questions

Yes. Form 8879 is issued by the IRS and is free to download and complete. JustFill provides a free fillable interface — there is no charge to complete the form. Your preparer may charge for tax preparation, but the form itself is free.
Usually your tax preparer sends it to you pre-filled with the return amounts. You can also download the blank PDF free from the IRS at irs.gov/forms-pubs/about-form-8879 and upload it into JustFill to complete it online without printing.
No. You return the signed form to your ERO (your tax preparer), who retains it for three years and provides it to the IRS only on request. Sending it to the IRS yourself does nothing.
A five-digit number you choose — any five digits except all zeros — that serves as your electronic signature on the e-filed return. You can enter it yourself or check the box authorizing your ERO to enter it for you.
Yes. The IRS permits electronic signatures on Form 8879 when the ERO follows the identity-verification requirements in IRS guidance. Many preparers accept a typed or drawn signature on the PDF — confirm with your preparer what they accept.

Official source: Form 8879 on IRS’s website

JustFill is an independent product and is not affiliated with, endorsed by, or sponsored by IRS or any government agency. Always verify your completed form on the official version before signing or submitting.