Tax · United States
IRS Letter 5071C — verify your identity so your return can be processed
A 5071C means the IRS received a tax return under your name, SSN or ITIN and needs to confirm you really filed it. It is a fraud filter, not an accusation — but the return and any refund stay frozen until identity is verified.
How serious: routineAlso called: 5071C, CP5071, CP5071F, 6331C, identity verification letter
The IRS Taxpayer Protection Program sends this letter when a return arrives under your name, SSN or ITIN and the IRS wants confirmation you filed it before processing. It is a screening step against identity theft, not an accusation.
Until verification happens, the return sits unprocessed. No refund is issued and no overpayment is credited in the meantime.
The IRS now issues this as the CP5071 notice series (CP5071, 5071C, CP5071F); older letters are numbered 5071C or 6331C. All point to the same verification route — online via the IRS Identity and Tax Return Verification Service, or by phone.
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 or notice number '5071C', '6331C' or 'CP5071' is printed on it. The wording is about verifying your identity and the tax return, and it directs you to the IRS Identity and Tax Return Verification Service (irs.gov/verifyreturn) and/or a Taxpayer Protection Program phone number.
The deadline
Verify promptly; per TAS, for phone verification: 'Call the toll-free IRS Identity Verification telephone number in the CP 5071 notice within 30 days from the date of this letter'
Verification is expected promptly. For phone verification, the Taxpayer Advocate Service says to call the toll-free IRS Identity Verification number in the notice within 30 days from the date printed on the letter.
If you do nothing
The return simply stays unprocessed: no refund is issued and no overpayment is credited until identity is verified. After successful verification, it can take up to 9 weeks for the refund to arrive or for the overpayment to be applied to next year's estimated tax.
How it escalates
- 01The tax return is not processed; refunds are not issued and overpayments are not credited until verification.
- 02The refund remains frozen indefinitely until verification is completed.
Common questions
Does a 5071C mean I am suspected of something?
No. It is a fraud filter: the Taxpayer Protection Program screens suspicious returns for identity theft, and this letter only asks for confirmation that the return is really yours.
What if I never filed the return the letter mentions?
That can be reported to the IRS immediately — it may mean someone used your identity. An Identity Protection (IP) PIN can be requested.
How long does the refund take after verifying?
Up to 9 weeks after successful verification, for the refund to arrive or the overpayment to be applied to next year's estimated tax.
Why does my letter say CP5071 instead of 5071C?
The IRS now issues this as the CP5071 notice series — CP5071, 5071C and CP5071F. Older letters carry the numbers 5071C or 6331C. The meaning is the same.
Sources
Facts verified against the sources below on 28 August 2026.