Tax Relief AnswersIRS Letters 4883C and 5071C: Verify Your Identity and Return
The short answer
Letter 4883C and Letter 5071C both mean the IRS received a Form 1040-series return filed under your Social Security number or ITIN and wants you to verify your identity and that return before it continues processing it. If you filed, verifying lets the return move forward; if you did not file, you need to tell the IRS, because you may be a victim of identity theft. Until you verify, the IRS says it cannot process the return or issue the refund. Sources: IRS, Understanding your letter 4883C (reviewed by the IRS July 20, 2026) and IRS, Understanding your CP5071 series notice (reviewed March 17, 2026), checked November 3, 2026.
The two letters compared
| Question | Letter 4883C | Letter 5071C (CP5071 series) |
|---|---|---|
| Why you got it | A 1040-series return was filed under your SSN or ITIN; the IRS needs to verify you and the return | Same |
| How to verify | Call the Taxpayer Protection Program Hotline printed on your letter | Follow the instructions on the notice; if it offers online verification, start at IRS.gov/verifyreturn |
| Have ready | The letter, the return it names, a prior-year return if you filed one, and supporting documents (W-2, 1099, Schedule C or F) | The notice, the return for the year listed, a prior-year return if available, and supporting documents |
| If you did not file | Tell the IRS right away | Say so during verification |
| Form 14039 (identity theft affidavit) | The IRS says do not file it if you received 4883C | Not needed after you verify, unless the IRS tells you |
| After you verify | Processing resumes; a refund can take up to 9 weeks | Processing continues |
| Deadline | None stated; the return waits until you verify | Follow the notice instructions |
The CP5071 series also includes CP5071 and CP5071F. The phone line or contact method on these letters is for identity and return verification only; the IRS says it will not give refund status or other account information.
Where it sits
These letters are not collection notices and do not mean you owe money. They come during return processing, before any refund is issued. They are not related to the CP14 to LT11 collection sequence.
Steps
- Check that the letter is real. Both letters have their own IRS.gov pages, linked above, that describe what a genuine letter asks for. Our guide to checking an IRS letter explains the signs of a fake.
- Gather the documents listed in the table.
- Verify by the method your letter gives: the hotline for 4883C, or online or by phone for the CP5071 series.
- If you cannot verify by phone, the IRS says it will ask you to make an appointment at a local IRS office and bring the same documents.
- If someone else will call for you, the IRS needs Form 2848 on file, or you must be on the call together. A fiduciary uses Form 56.
- To protect future returns, the IRS suggests an Identity Protection PIN.
Common mistakes
- Ignoring the letter because it looks like a scam. A real one holds up your return and refund until you verify.
- Filing Form 14039 after a 4883C. The IRS says not to.
- Calling the hotline about a refund status. The IRS says the line is for verification only.
- Bringing only W-2s. The IRS says W-2 and 1099 forms are not tax returns; you need the return itself.
Identity verification is free and is done directly with the IRS. If identity theft is causing hardship, the Taxpayer Advocate Service can help at no cost.
FAQ
Is Letter 5071C or 4883C a scam?
Both are real IRS letter types with their own IRS.gov pages. A genuine one asks you to verify by the method printed on it; our guide to checking an IRS letter covers the signs of a fake.
What happens if I do not respond to a 4883C?
The IRS says it cannot process your return, issue a refund or credit an overpayment until it hears from you.
How long after verifying will I get my refund?
For 4883C, the IRS says it may take up to 9 weeks after you verify, unless it finds other problems.
I did not file a return. What do I do?
Tell the IRS during verification or right away for 4883C. The IRS says someone may have filed a fraudulent return using your name and number, and you may be a victim of identity theft.