Form 8879: IRS e-file Signature Authorization
The declaration and signature authorization an ERO must obtain before e-filing an individual return. The taxpayer attests to the return's figures and authorizes a PIN as their signature. Never sent to the IRS — retained by the firm for three years.
Overview
IRS Form 8879, IRS e-file Signature Authorization, is the declaration document and signature authorization for an e-filed return submitted by an Electronic Return Originator (ERO). It is not a tax return and it is not sent to the IRS. It is the piece of paper — or, increasingly, the electronic record — that proves the taxpayer saw the return, agreed with the numbers on it, and authorized the firm to transmit it under a personal identification number (PIN) that functions as their signature.
The current revision (Rev. January 2021) authorizes e-file of Form 1040, 1040-SR, 1040-NR, 1040-SS, and 1040-X for tax years beginning with 2019. A single Form 8879 covers one taxpayer (or one married-filing-jointly couple) for one tax year and one return. An amended return filed later needs its own Form 8879, because the taxpayer is attesting to a different set of numbers.
Two rules make Form 8879 the operational backbone of a tax practice rather than a formality. First, the ERO must receive the completed and signed form back from the taxpayer *before* the return is transmitted or released for transmission — signing after the fact does not cure a return that was already filed. Second, the ERO must retain the form for three years from the return due date or the IRS received date, whichever is later, and produce it if the IRS asks. A firm that e-files hundreds of returns is therefore running a signature-collection and retention pipeline, and the health of that pipeline is what an e-file compliance review actually examines.
The 8879 family: matching the authorization to the return
"Form 8879" without a suffix means the individual income tax version. Every other return type has its own authorization, and they are not interchangeable — transmitting a partnership return under an individual Form 8879 leaves that return without a valid signature.
Form 8879 authorizes Forms 1040, 1040-SR, 1040-NR, 1040-SS and 1040-X. Form 8878 covers an extension request on Form 4868 or Form 2350 where an electronic funds withdrawal is authorized. Form 8879-PE covers Form 1065, Form 8879-S covers Form 1120-S, Form 8879-CORP covers Form 1120, and Form 8879-F covers Form 1041. Form 8879-TE covers the tax-exempt entity returns, Form 8879-EMP the employment tax returns, and Form 8879-EX the excise tax returns.
The newest member is Form 8879-TA, IRS e-file Signature Authorization for Form 4547, Trump Account Election(s), revised December 2025. It follows the same pattern as the rest of the family: the ERO obtains and retains it, and it authorizes the ERO to enter or generate the PIN of the parent, guardian, or other authorized individual making the election. Because Form 4547 is filed alongside the individual return, a firm handling these elections will be collecting two authorizations for one client engagement — the ordinary Form 8879 for the 1040 and Form 8879-TA for the election.
The practical rule for a firm: the authorization form is chosen by the return being transmitted, not by the client or the engagement. Where one client engagement produces several e-filed returns, it produces several signed authorizations, each retained on its own three-year clock.
Why the ordering rule is the one that gets firms in trouble
Of everything Form 8879 requires, the requirement that reliably surfaces in an e-file compliance review is sequence: the signed form must be received before the return is transmitted or released for transmission. It is easy to satisfy and easy to violate, because the pressure to transmit peaks exactly when signatures are slowest to come back.
The evidence is self-documenting and works against a firm that gets it wrong. The signature carries a date; the transmission carries a Submission Identification Number and an acknowledgement timestamp. A signature dated after the acknowledgement is not an ambiguity to be explained — it is a record of a return filed without authorization.
The structural fix is to make transmission depend on the signature rather than run alongside it, so that a return physically cannot be released until the signed authorization is attached to it. Firms that treat signature collection as a reconciliation task performed after filing eventually find a gap during the busiest fortnight of their year, and the only remedy at that point is a conversation with the client about a return already filed in their name.
Retention as an operating system, not a filing cabinet
Three years from the return due date or the IRS received date, whichever is later, sounds simple until it meets an extended return. A 2025 individual return extended and received by the IRS in October 2026 must be retained until October 2029, while the same firm's April-filed 2025 returns run to April 2029. Retention is therefore per-return, not per-season.
Electronic retention is expressly allowed, in accordance with the recordkeeping guidelines in Rev. Proc. 97-22. That is what makes a document-management approach viable: a scanned or natively electronic Form 8879, stored so it can be retrieved and reproduced legibly, satisfies the obligation. It also means the retention clock belongs in the system that stores the document, not in someone's memory.
What a review asks for is a specific taxpayer's authorization for a specific year, on request. A firm that can answer that in a minute has a working system; a firm that reconstructs it from a shared drive and an email thread has a retention exposure it has not priced.
Who Files This Form?
Form 8879 is completed by the ERO and signed by the taxpayer; neither party files it with the IRS. It is required in either of two situations: the return is filed using the Practitioner PIN method, or the taxpayer authorizes the ERO to enter or generate the taxpayer's PIN on the e-filed individual income tax return.
On a joint return, both spouses must sign. Each spouse has their own PIN block on the form, and each must independently choose whether the ERO enters their PIN or they enter it themselves. A return transmitted with only one spouse's authorization is not properly signed, and this is one of the most common findings in an e-file compliance review.
The form is not needed when a taxpayer self-prepares and self-files, and it is not needed when a taxpayer signs their own return using the Self-Select PIN method entirely on their own. It is also the wrong form for several adjacent situations that practitioners routinely confuse: an extension paired with an electronic funds withdrawal uses Form 8878, and every entity return has its own member of the 8879 family (see the family reference below). Using the individual Form 8879 to authorize a partnership or S-corporation return is not a paperwork slip — the return is unsigned.
There is no due date for Form 8879 in the ordinary sense. The operative deadline is transmission: the signed form must be in the ERO's hands first. What does have a date attached is retention — three years from the return due date or the IRS received date, whichever is later.
Key Fields
Submission Identification Number (SID)
The 20-digit number assigned to the transmitted return, entered at the top of the form. Because the SID does not exist until the return is transmitted, it is populated after the fact — the taxpayer signs before there is a SID. As an alternative, the ERO may associate Form 9325 (Acknowledgement and General Information for Taxpayers Who File Returns Electronically) with the Form 8879 after filing; Form 9325 does not have to be physically attached, but it must be kept under the same retention rules.
Part I, Line 1: Adjusted gross income
AGI from the return being authorized, in whole dollars. The figures in Part I are the taxpayer's anchor — the declaration in Part II states that these amounts match the return they examined. If the return changes after signature, even by a dollar, the authorization no longer describes the return being filed and a new Form 8879 is required.
Part I, Line 2: Total tax
Total tax from the return. Along with AGI, this is the figure most likely to shift during a late review cycle — a reclassified 1099, a corrected K-1, or a late-arriving brokerage statement changes it and invalidates a signature already collected.
Part I, Line 3: Federal income tax withheld
Withholding from Forms W-2 and 1099. Leave blank for Form 1040-SS filers, who complete line 4 only.
Part I, Lines 4 and 5: Amount refunded / Amount you owe
The bottom line the client actually reads. Line 4 is the only Part I entry a Form 1040-SS filer completes — lines 1, 2, 3, and 5 stay blank for those returns.
Part II: Taxpayer Declaration and Signature Authorization
A penalties-of-perjury declaration that the taxpayer examined a copy of the return, that it is true, correct and complete, and that the Part I amounts come from that return. It also carries the consent allowing the ERO, transmitter, or intermediate service provider to send the return and receive the acknowledgement or rejection, and — where applicable — the taxpayer's authorization for an ACH electronic funds withdrawal. Note that the electronic funds withdrawal consent lives inside this paragraph: authorizing the return also authorizes the direct debit, and cancelling a payment requires contacting the U.S. Treasury Financial Agent at 1-888-353-4537 no later than two business days before the settlement date.
Part II: Taxpayer's PIN — check one box only
Two mutually exclusive choices, and each spouse chooses separately. Box one authorizes the named ERO firm to enter or generate the taxpayer's five-digit PIN as their signature — the firm name goes on the authorization line, not the name of the individual preparer. Box two is the taxpayer entering their own PIN, and it is valid only when the return is filed using the Practitioner PIN method, in which case the ERO must complete Part III. The PIN is five digits and cannot be all zeros.
Taxpayer's and spouse's signature and date
Both are required on a joint return, each with a date. The signature date must precede transmission. An undated signature is a live audit exposure precisely because the date is what evidences the ordering.
Part III: Certification and Authentication — Practitioner PIN Method Only
Completed by the ERO only when the Practitioner PIN method is used. The ERO enters an eleven-digit string: their six-digit EFIN followed by their five-digit self-selected PIN, which cannot be all zeros. Signing Part III certifies that the entry is the ERO's signature and that the return is being submitted in accordance with the Practitioner PIN method and Publication 1345.
Authentication Record (not on the form, but coupled to it)
The choice of method changes what the transmitted return must carry. Under the Practitioner PIN method the ERO is not required to enter the taxpayer's date of birth, prior-year AGI, or prior-year PIN in the Authentication Record. Outside that method, the ERO must enter the taxpayer's date of birth and either the prior-year AGI or the prior-year PIN — taken from the prior year's originally filed return, never from an amended return or an IRS math-error correction.
Filing Deadlines
No penalty for the form itself. The exposure is procedural: transmitting before the signed form is received, or failing to produce it during an e-file compliance review, puts the firm's EFIN at risk.
Step-by-Step Instructions
- 1
Finish the return and lock the figures. Because Part I restates AGI, total tax, withholding, and the refund or balance due, any later change to those numbers invalidates a signature already collected. Collecting signatures on a return still under review is the single most expensive habit in an e-file workflow.
- 2
Confirm the identity of the taxpayer. Publication 1345 makes identity confirmation an ERO responsibility, and it is a separate step from collecting the signature — particularly for a client the firm has never met in person.
- 3
Populate Part I from the return in whole dollars. For a Form 1040-SS filer, complete line 4 only and leave lines 1, 2, 3, and 5 blank.
- 4
Decide the PIN method with the client and complete Part II accordingly. If the ERO will enter or generate the PIN, put the ERO firm name — not the preparer's name — on the authorization line. On a joint return, walk through both spouses' boxes separately; each spouse may choose differently.
- 5
Deliver the form to the taxpayer. Hand delivery, U.S. mail, private delivery service, email, an internet website, or fax are all permitted, which is what makes a portal-based signature workflow viable.
- 6
Get the signed form back and check the dates before you transmit. The completed, signed Form 8879 must be received before the electronic return is transmitted or released for transmission. This ordering is the requirement most likely to be tested in a compliance review, and the signature dates are the evidence.
- 7
Complete Part III if — and only if — you are filing under the Practitioner PIN method: six-digit EFIN followed by your five-digit self-selected PIN, then sign and date.
- 8
Transmit the return, then record the 20-digit Submission Identification Number on the form, or associate Form 9325 with it instead. Form 9325 need not be physically attached but must be retained on the same schedule.
- 9
File the form into retention for three years from the return due date or the IRS received date, whichever is later. Electronic retention is explicitly permitted under the recordkeeping guidelines in Rev. Proc. 97-22, so a scanned or natively electronic copy is acceptable when those guidelines are met.
- 10
For an amended return, start over. Form 8879 (Rev. January 2021) authorizes original and amended returns alike, but a Form 1040-X carries different Part I amounts and therefore needs its own signed authorization.
Common Mistakes to Avoid
Transmitting the return before the signed Form 8879 comes back.
Treat receipt of the signed form as the gate on transmission, not a task to reconcile afterwards. The instructions are explicit that the ERO must receive the completed and signed form before the return is transmitted or released for transmission, and a signature dated after the SID is self-documenting evidence that it was not.
Collecting only one spouse's signature on a joint return.
Both spouses sign, each in their own PIN block, each with a date. Build the check into the workflow rather than the reviewer's memory — on a joint return a single signature means the return was transmitted unsigned for one filer.
Re-using a signed Form 8879 after the return changed.
Any change to AGI, total tax, withholding, refund, or balance due breaks the Part I attestation. Reissue the form and collect a fresh signature. A late-arriving 1099 or a corrected K-1 is the usual trigger.
Putting the individual preparer's name on the Part II authorization line.
The instructions call for the ERO firm name, not the name of the individual preparing the return. The authorization runs to the firm that holds the EFIN.
Mailing Form 8879 to the IRS.
Don't send it unless the IRS requests it. The form's own footer says so. Mailing it does not create a record the IRS keeps on the taxpayer's behalf, and it does not relieve the ERO of the retention obligation.
Completing Part III on every return.
Part III is Practitioner PIN method only. Completing it on a return filed under a different method misstates the method used; leaving it blank when the Practitioner PIN method *was* used leaves the return without the ERO's certification.
Discarding forms at the end of the filing season.
Retention runs three years from the return due date or the IRS received date, whichever is later — not three years from when the engagement closed. An extended return that the IRS received in October resets the clock accordingly.
Using Form 8879 to authorize an entity return or an extension.
Match the form to the return: Form 8878 for an extension with electronic funds withdrawal, and the corresponding member of the 8879 family for partnership, corporate, fiduciary, exempt-organization, employment, or excise returns. The individual Form 8879 does not sign any of them.
Frequently Asked Questions
No. The form's footer reads "Don't Submit This Form to the IRS Unless Requested To Do So." The ERO obtains it, retains it, and produces it only if the IRS asks.
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