Form 8879: IRS e-file Signature Authorization
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IRS Form 8879, IRS e-file Signature Authorization (Rev. January 2021), is the e-file authorization form your tax preparer — an Electronic Return Originator (ERO) — has you sign before transmitting your Form 1040, 1040-SR, 1040-NR, 1040-SS or 1040-X. Part I lists five amounts from the return, Part II is your declaration, five-digit PIN choice and signature, and Part III is the ERO's own certification. You return it to the preparer, who keeps it for three years; it is never sent to the IRS. The IRS accepts a handwritten signature or an e-signature captured by the preparer's identity-verification software. With JustFill you upload the PDF, the AI detects every field, you type or dictate your entries, and the first clean completed PDF download is included at no charge.
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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 five whole-dollar amounts from the original or amended return (adjusted gross income, total tax, federal tax withheld, refund, amount owed) so you can verify them before anything is transmitted. Part II is your declaration and signature: you either authorize the ERO firm to enter or generate your five-digit PIN, or state that you will enter it yourself, and that PIN becomes your signature on the e-filed return. 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 to send back to your preparer — the first clean completed PDF download is included at no charge. It works even on scanned or flattened copies.
The current official Form 8879 is Rev. January 2021, free at irs.gov/pub/irs-pdf/f8879.pdf; the IRS also publishes a Spanish version, Form 8879 (SP). Usually you do not need the blank — your preparer sends the form already filled in with the return amounts. Upload that PDF, or the blank, to JustFill to complete the taxpayer entries in your browser; the first clean completed PDF download is included at no charge. JustFill sends nothing to the IRS or to your preparer — you return the signed form yourself.
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.
Your name and Social Security Number exactly as they appear on the return, and the spouse's name and SSN on a joint return. The Submission Identification Number (SID) box above them is for the ERO, who enters the 20-digit SID assigned to the return or associates Form 9325 with the form after filing. At the top of Part I, enter the tax year you are authorizing.
Lines 1–5, whole dollars only: adjusted gross income, total tax, federal income tax withheld from Forms W-2 and 1099, the amount you want refunded, and the amount you owe. Form 1040-SS filers use line 4 only. The ERO fills these from the return; you verify they match the return you were shown.
Your declaration, under penalties of perjury, that you have reviewed the return and the amounts in Part I are correct.
Check one box only. Either you authorize the named ERO firm to enter or generate your PIN — writing five digits, not all zeros, in the boxes — or you will enter your own PIN, which applies only when the return is filed under the Practitioner PIN method. A spouse has the same two boxes; neither spouse may select or enter the PIN of the other.
Your signature and date; spouse signs separately on a joint return.
Practitioner PIN method returns only. The ERO enters a six-digit EFIN followed by a five-digit self-selected PIN, certifies compliance with Pub. 1345, signs and dates. You leave this part to your preparer, and it stays blank when the ERO is not using the Practitioner PIN method.
A fictional married couple whose preparer e-files their joint 2025 Form 1040 under the Practitioner PIN method. The preparer fills the header and Part I from the finished return; the couple checks the PIN boxes, signs Part II and sends the form back. Identifiers are masked.
Left blank by the taxpayers
The 20-digit SID is assigned when the return is filed. The ERO adds it afterwards or attaches Form 9325 instead.
ALEX EXAMPLE, •••-••-1234 / JAMIE EXAMPLE, •••-••-5678
Exactly as they appear on the return. The real form carries full Social Security numbers, so check the finished PDF before emailing it.
2025
The year you are authorizing, not the year you sign.
AGI 84,300 · total tax 7,912 · federal tax withheld 9,150 · refund 1,238 · amount owed: blank
Whole dollars only, copied from the return. The taxpayers compare these five numbers with the return before signing anything.
First box: I authorize EXAMPLE TAX SERVICES LLC to enter or generate my PIN 24680
The ERO firm name goes on the line, and the PIN is any five digits except all zeros. The second box is only for a taxpayer entering their own PIN under the Practitioner PIN method.
First box: I authorize EXAMPLE TAX SERVICES LLC to enter or generate my PIN 13579
Each spouse chooses their own PIN. One spouse may authorize the ERO while the other enters their own, but nobody may enter the PIN of an absent spouse.
Alex Example, 03/12/2026 · Jamie Example, 03/12/2026
Handwritten, or electronic if the preparer uses IRS-compliant e-signature software. Both signatures must reach the ERO before the return is transmitted.
Left to the preparer: six-digit EFIN followed by a five-digit ERO PIN
Part III is completed only under the Practitioner PIN method and only by the ERO. The taxpayers never touch it.
Emailed back to Example Tax Services LLC, who retains it
The form says "Don't submit this form to the IRS unless requested to do so." The ERO keeps it for 3 years from the return due date or IRS received date, whichever is later.
These values are made up. They are here to show what belongs on each line, not to be copied — every name, number, and address on your own Form 8879 has to be your own.
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Official source: Form 8879 on IRS’s website
Edition checked: Form 8879 (Rev. January 2021), Cat. No. 32778X, OMB No. 1545-0074. Verified against the official source on · Verified in our Government Forms Fillability Study.
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