What’s This Letter
EN
Read my letter

Tax · United States

IRS Letter 4883C — identity verification by phone, before your return moves

A 4883C means the IRS received a Form 1040-series return under your SSN or ITIN and must verify your identity before processing it — specifically by telephone, with no online option. The return and any refund wait until the call happens.

How serious: routineAlso called: 4883C, identity verification call letter, Taxpayer Protection Program letter

Like the 5071C, the 4883C means a return was filed under your SSN or ITIN and the IRS must confirm your identity before processing it. The difference: the 4883C requires verification by telephone — there is no online option.

Until the call happens, the return and any refund are on hold. The call goes to the Taxpayer Protection Program Hotline listed in the letter and involves questions about the return.

The letter lists what to have available for the call: the letter itself, the referenced 1040-series return, a prior-year return, and supporting documents such as W-2s, 1099s, or Schedules C or F.

Who sends it

The Internal Revenue Service (IRS), through its Taxpayer Protection Program — the unit of the US federal tax authority that screens suspicious tax returns for identity theft.

The letter number '4883C' is printed on it. It asks you to call the Taxpayer Protection Program Hotline listed in the letter, and instructs you to have the letter, the referenced 1040-series return, a prior-year return and supporting documents (W-2, 1099, Schedule C/F) available.

The deadline

No response deadline is stated in the official explanation of this letter. The letter carries its printed date, and the hold on the return simply continues until the call is made.

If you do nothing

Until the IRS hears from you, it cannot process the tax return, issue a refund, or credit an overpayment to the account. The hold continues indefinitely until identity is verified. After verification, it may take up to 9 weeks for the refund to arrive or the overpayment to be credited.

How it escalates

  1. 01The tax return is not processed; no refund is issued and no overpayment is credited.
  2. 02The hold continues indefinitely until identity is verified.

Your options, procedurally

  • The Taxpayer Protection Program Hotline number in the letter can be called, with the letter, the tax return in question, a prior-year return and supporting documents ready.
  • If phone verification is impossible, the IRS arranges an in-person appointment at a local office, with the same documents brought along.
  • If the return was not filed by you, that can be reported to the IRS immediately — it may mean identity theft.

Common questions

Can a 4883C be handled online?

No. This letter specifically requires verification by telephone — there is no online option. If phone verification is impossible, the IRS arranges an in-person appointment at a local office.

What happens while the call has not been made?

The return stays unprocessed: no refund is issued and no overpayment is credited. The hold continues indefinitely until identity is verified.

How long does the refund take after the call?

After verification, it may take up to 9 weeks for the refund to arrive or for an overpayment to be credited to the account.

Sources

Facts verified against the sources below on 28 August 2026.