5747C: The Identity Verification Letter That Requires Showing Up in Person

What the notice actually says

Letter 5747C tells the recipient that a Form 1040-series return was filed under their name and Social Security number or Individual Taxpayer Identification Number (ITIN), and that the IRS needs to verify both the identity of the filer and the return itself before continuing. The IRS states its reasoning directly: "To protect you from identity theft, we need you to verify your identity and the tax return so we can continue processing it." The letter also carries a specific warning most identity-verification letters do not: nothing about the return moves until this is resolved. (For how 5747C fits among the other IRS notices, see the IRS Notice Library.)

Internally, the IRS classifies this letter under the Internal Revenue Manual (IRM), specifically IRM 25.25.6.1.7, as "Potential Identity Theft during Original Processing — TAC AUTH ONLY." That label is the whole story in five words: whatever triggered this case, the IRS has decided phone or online verification will not close it, and only an in-person Taxpayer Assistance Center (TAC) visit will.

Why this one requires showing up, and what the IRS does not say

Most IRS identity-verification letters — 5071C and 4883C among them — offer a phone or online path. 5747C does not. The account has been flagged internally with a marker IRM 25.25.6 calls "TAC AUTH ONLY." A similar term, "HIGH RISK AUTH," sometimes shows up too, but the public IRM text only backs up the first one, so this page mentions "HIGH RISK AUTH" without treating it as confirmed. Either way, the case is routed away from remote verification entirely. IRM 25.25.6.2.2.3, which governs how IRS employees handle written responses to this letter, states plainly that "the taxpayer must visit the Taxpayer Assistance Center (TAC)."

What the IRM does not do, at least in the text available publicly, is spell out the specific fraud indicators that push a case into the TAC-only or high-risk lane rather than the phone/online lane that 5071C and 4883C use. It documents that the marker exists and what happens once it's set, not the criteria that set it. Anyone telling a client exactly why their particular return triggered in-person handling, rather than a phone call, is inferring — the published IRM does not confirm the reasoning at that level of detail, and this page does not either.

One narrow exception is worth flagging so it isn't missed: IRM 25.25.6.1.7 also describes a pilot that began in July 2025, using a self-service scheduling tool called FAST SMART, that lets some 5747C recipients book their own TAC appointment online instead of calling. Whether that option applies depends on the individual letter — check it for a self-scheduling link before assuming a phone call is the only route in.

The appointment process and what to bring

Two different phone numbers appear on this letter, and they do different jobs. The Taxpayer Protection Program hotline printed on the letter is for someone who did not file the return in question — calling it reports the return as fraudulent and starts a separate identity-theft track, not an appointment. The Taxpayer Assistance Center toll-free number, 844-545-5640, is for someone who did file the return — calling it only books a time slot. It does not verify anything by itself; the verification happens at the appointment.

TACs operate strictly by appointment. The IRS Taxpayer Assistance Center Locator finds the nearest office and its hours, but the office itself will not see a walk-in — the tool's own instructions are to locate the office, then call to schedule.

The document checklist, per the IRS's own instructions for this letter and confirmed by the Taxpayer Advocate Service: the 5747C letter itself; the Form 1040-series return the letter references; a prior-year return if the letter asks for one; the supporting documents for each return in question (W-2s, 1099s, Schedule C or F, and similar); a valid government-issued photo ID (driver's license, state ID, or passport); and at least one additional form of identification — a Social Security card, mortgage or lease statement, utility bill, car title, voter registration card, or birth certificate are all accepted. An authorized representative may accompany the taxpayer, but the taxpayer must personally appear to authenticate their own identity — that step cannot be delegated.

The scheduling call itself is the practical bottleneck. IRS Newsroom's summary of the National Taxpayer Advocate's 2026 mid-year report to Congress put Filing Season 2026 Taxpayer Protection Program line volume at 2.4 million calls, with only 459,000 answered — a 19% level of service — and a 20-minute average wait for those who got through. That figure describes TPP-line calls generally, not the TAC-scheduling line by itself, but it is the clearest available measure of how hard this system is to reach by phone, and it should set expectations before the first call, not after several failed ones. See How to Actually Reach the IRS for how this line compares to the IRS's other phone lines.

What happens to the return and the refund while this is pending

The letter is explicit about the consequence of inaction: "We won't be able to process your tax return, issue a refund, or credit any overpayments to your account" until identity is verified. The return is not rejected and not lost — it is held exactly where it is, with no processing of any kind, for as long as verification is outstanding. Nothing about that changes with time; there is no point at which the IRS processes the return anyway.

Completing the in-person appointment is what restarts the clock. Per the Taxpayer Advocate Service, once identity is verified, it may take up to nine weeks to receive the refund, plus any interest the IRS owes on it — and that nine weeks runs from the appointment, not from when the letter first arrived. A taxpayer's refund-tracking tool will not reflect anything useful until a couple of weeks after the appointment, so checking it daily in the interim will not surface new information.

5747C gets confused with — and why the distinction matters

5747C is frequently mentioned in the same breath as 5071C and 4883C, and all three share the same underlying purpose — confirming a return really came from the person whose name is on it. The difference that matters is the channel. 5071C generally offers online verification through an IRS identity-verification service, and 4883C is verified by phone. Both are self-service paths a taxpayer can complete without leaving home. 5747C offers neither; it is TAC-only by IRS design, and treating it as interchangeable with the other two — assuming a phone call or website login will resolve it — wastes the time between the letter's arrival and the eventual discovery that an appointment was always required.

5747C is also unrelated to 6330C, despite the superficial resemblance of the code. 6330C sits in a different part of the notice stream entirely, and a taxpayer holding both letters is dealing with two separate matters, not one.

Common Questions