File · E-Filing, the IRS’s Real Way
How e-filing will work here
The IRS's real signature system, explained before we ever transmit a return: the Self-Select PIN you choose, the identity check behind it, Form 8879 when a pro files for you, and the IP PIN that must be on the return or it rejects.
Education only — not personal tax advice. Personal questions route to a credentialed pro.
Figures verified against IRS sources · Tax-year tables 2016–2026 · Re-verified each season by the Update Engine · Last review: November 7, 2026
1 — The Self-Select PIN: your signature is five digits
An e-filed return has no pen. In its place, the IRS uses the Self-Select PIN: a five-digit number you choose — any five digits except all zeros — entered at filing time as your electronic signature, under penalty of perjury, exactly as binding as signing the paper form. On a joint return, each spouse chooses their own.
When a professional prepares your return, there are two ways your PIN gets onto it: you enter your chosen PIN yourself (the practitioner can be present, but the choice is yours), or you sign Form 8879 authorizing the preparer’s firm — the Electronic Return Originator, or ERO — to enter it for you (section 3 below). Either way, the PIN is your signature: never let anyone file for you with a PIN you did not choose or authorize.
Remember the PIN you choose. Next year it becomes one of the two ways you prove your identity to the IRS (section 2). In this beta, nothing on Niptei Tax asks for it — this page only teaches the system.
2 — The identity check behind the PIN: last year’s AGI
A chosen PIN alone would let anyone sign as anyone. So the IRS pairs it with a fact only the real filer should know: the Adjusted Gross Income from last year’s return (or last year’s Self-Select PIN, if you remember it). Enter it wrong and the return is rejected on the spot — see IND-031 / IND-032 in the Reject Decoder.
Where to find your prior-year AGI:
- Line 11 of last year’s Form 1040 — the return as originally filed. If you later amended it, the IRS still expects the ORIGINAL return’s AGI, not the amended one.
- Lost the return? Pull a tax return transcript from your IRS online account or Get Transcript — the transcript shows the AGI the IRS has on file.
- Married filing jointly this year, and you filed jointly last year? Both spouses enter the same, full AGI amount — never half each.
The special cases, in one honest line: if you filed last year's return late, or did not file at all, or you are filing for the first time — and likewise if you filed last year under an ITIN and now have an SSN — the IRS instructs you to enter 0 as the prior-year AGI; if you have a current IP PIN (section 4), it satisfies this identity check instead of the AGI.
3 — Form 8879: when a pro files for you
If a preparer e-files your return, you sign Form 8879 — IRS e-file Signature Authorization (official IRS PDF). Your signature declares the return true, correct, and complete, and authorizes the ERO to transmit it and enter your Self-Select PIN as your signature. For an extension e-filed by a pro, the sibling form is Form 8878 (official IRS PDF), covering Form 4868 or Form 2350.
Two facts people get wrong: the signed 8879 is kept by the ERO — retained on file for three years — and is never sent to the IRS. And it must be signed before the return is transmitted, not after. When white-label filing opens here, your preparer’s clients sign under the firm’s own name — see Pros & Trust. Both forms are explained in the Forms Library.
4 — The IP PIN: six digits that must be on the return
Separate from the PIN you choose: if the IRS has issued you an Identity Protection PIN (IP PIN) — a six-digit number, new every year, mailed on notice CP01A or retrieved from the IRS — that number must be entered on your return. Leave it off, or enter last year’s, and the return rejects automatically (IND-180). A spouse or dependent issued their own IP PIN needs theirs on the return too.
Only you can get your IP PIN: retrieve it at irs.gov — Get an IP PIN. And the scam rule that never changes: the IRS sends the IP PIN by mail or inside your secure IRS account — never by an unsolicited call, text, or email asking you to “confirm” it. Anyone asking that way is stealing it — see the Scam Shield.
5 — After you send: accepted, or rejected with a short clock
Every transmitted return comes back with an acknowledgment: accepted (the IRS has it; processing and any refund clock start) or rejected — the IRS computer matched something and stopped. A rejection is not an audit and not a penalty; the return simply is not filed yet, and it comes back with a code naming the exact mismatch.
The fix window is short and set by the IRS: for a return that was transmitted on time, you have 5 calendar days to correct and retransmit it electronically and still count as timely — the IRS calls this the perfection period. Switch to paper instead, and a return postmarked by the later of the due date or 10 calendar days after the rejection notice is likewise timely. (IRS Publication 1345 and IRM 3.42.5 (perfection periods for timely filed rejected returns), verified Nov 7, 2026.) Five days is no time to discover a rejection in an unread inbox — which is exactly why the alert routing below exists, and why the Reject Decoder already lives on this site today: when e-file opens here, it sits on every rejection, next to the fix.
Rejection alerts, routed — designed and ready
When a return is rejected, three people hear about it at once
The IRS gives a short window to fix a rejected return and retransmit it as if it had never failed — 5 calendar days to perfect it electronically, or a paper return postmarked within 10 calendar days of the rejection notice (IRS Publication 1345 and IRM 3.42.5 (perfection periods for timely filed rejected returns), verified Nov 7, 2026.) A rejection that sits unread in one person’s inbox burns that window. So the routing is simultaneous, by design:
| Who is alerted | How | What the alert carries |
|---|---|---|
| The filing preparer | In-platform alert + email, the moment the IRS acknowledgment returns | The exact reject code, decoded in plain language by the Reject Decoder, the specific fix, and the perfection-window clock already counting |
| Their firm (the ERO of record) | The same alert, at the same moment — never only to the individual | The same decoded fix and clock, so a sick day, a departure, or a missed inbox at the firm can never strand a client’s filing |
| The client | In-platform alert + email, in their language | A plain-language version: what was rejected, whether anything is needed from them (a Social Security card, last year’s return, an IP PIN), and the date the fix must be in by — no raw codes, no panic |
Status, stated plainly: this routing is designed and ready, and it activates with e-file transmission — after our EFIN approval and the IRS MeF testing pass. Today Niptei Tax transmits nothing, so no alerts are sent; the paper packet path is the working route, and the Reject Decoder is live now for returns rejected anywhere else.
Until transmission opens
Everything above is the IRS's real system — the same one every preparer and software package in the country uses. Today, your working route is paper: build a packet in the Guided Packet Builder or the Unfiled Years Factory, and if a return you filed somewhere else has already been rejected, decode the code now in the Reject Decoder.