Why Would the IRS Need to Verify My Identity?

The IRS would need to verify your identity when its fraud-detection systems flag your return as possibly filed by someone other than you. Your return then sits unprocessed and your refund stays frozen until you confirm you are who you say you are. Receiving one of these letters does not mean the agency suspects you of wrongdoing; it means something on the return looked unusual enough that a human needs to confirm it before processing continues.¹

What Actually Sets Off the Flag

The primary driver is tax-related identity theft. Criminals steal Social Security numbers and file fraudulent returns early in the season, hoping to collect refunds before the real taxpayer files. Every incoming return runs through automated fraud filters, and anything that looks suspicious gets pulled out of normal processing so a verification letter can be generated.¹

Plenty of legitimate returns get caught in those filters too. Common triggers include:

A mismatch between the name on your return and Social Security Administration records, often after a recent name change.²
A typo in a dependent’s Social Security number.
Wages or other income on your Form 1040 that don’t match what employers or banks reported on W-2s and 1099s.
A new bank account for direct deposit, a mailing address that has never appeared on your prior returns, or a refund much larger than what you claimed in recent years.

None of these mean you did anything wrong. From the system’s perspective, they look like the kinds of changes a thief might make after hijacking someone’s account.

Which Letter You Received and Why It Matters

The IRS uses four letters, and the one you got determines how you can respond:¹

Letter 5071C or a CP5071 series notice is the most widely issued and gives you both online and phone options.³
Letter 4883C is phone only. You call the Taxpayer Protection Program hotline number printed on the letter.⁴
Letter 5447C goes to taxpayers with foreign addresses and offers phone and mail options.⁵
Letter 5747C is used sparingly and requires an in-person visit to a Taxpayer Assistance Center.⁶

Online verification is only available if you received a CP5071 series notice or Letter 5447C.⁵

Make Sure the Letter Is Real

Scammers exploit the urgency these letters create. The IRS initiates identity verification through physical mail, not through email, text, or social media. If a message arrives electronically claiming you need to verify your identity with the IRS, do not click any links; they may install malware or steal your information. Watch especially for messages with QR codes that direct you to fake IRS websites.⁷

A real letter arrives on paper with a specific letter number and control number printed on it. To confirm one you received, log in to your IRS Online Account at irs.gov; any legitimate letter or notice should appear there. You can also call IRS customer service directly.⁸

What to Gather Before You Respond

Wrong answers can cause a failed attempt and additional delays, so pull everything together before starting. You need:

The IRS letter itself, which contains the control number required for verification.
Your Social Security number or ITIN, whichever you used to file.
The tax return referenced in the letter. Be ready to confirm exact dollar amounts from specific lines; line 11 is your adjusted gross income and line 35a is your refund amount.⁹
A prior-year return from a different year than the one on the letter. The IRS uses this for comparison questions only the real taxpayer would be able to answer.⁶

If you don’t have copies, you can request a tax transcript through irs.gov or contact your tax preparer. Don’t guess.

Lost the letter? Log in to your IRS Online Account, which will route you to the identity verification tool. You can also call the Taxpayer Protection Program hotline at 800-830-5084, or 267-941-1000 from outside the United States.¹

How to Verify

Online

The fastest method, available for CP5071 series notices and Letter 5447C. Go to the IRS Identity Verification Service page, sign in with an ID.me account, or create one.⁵ Setting up ID.me requires a photo of a government-issued ID like a driver’s license or passport, plus a selfie taken with a smartphone or webcam.¹⁰ Once you’re in, you enter the control number from your letter and answer questions about your return. If the self-service path fails, ID.me offers a video chat with a live agent as a backup. Existing ID.me credentials from another government agency work here too.

By Phone

If you received Letter 4883C, Letter 5447C, or a CP5071 series notice, call the toll-free number printed on your letter. Have your documents in front of you. The representative confirms your identity using information from your current and prior-year returns.¹¹

In Person

Letter 5747C requires a visit to a Taxpayer Assistance Center. Schedule an appointment by calling 844-545-5640.¹² Bring the letter, the tax return in question, any supporting W-2s or 1099s, a valid government-issued photo ID, and at least one additional form of identification such as a Social Security card, a utility bill matching the address on file, a mortgage statement, or a voter registration card.⁶

What If You Never Filed That Return

This is the scenario that warrants concern. If you receive a verification letter but never filed a return for that year, someone else likely filed one using your Social Security number. Do not ignore the letter. Use the online tool or call the number on your letter, verify your own identity, and then tell the IRS you did not file the return. The agency will remove the fraudulent return from your account.¹³

One thing not to do: do not file Form 14039 (Identity Theft Affidavit) in response to a verification letter. Follow the letter’s instructions instead. Form 14039 is for a different situation, such as when your e-filed return gets rejected because someone already filed under your Social Security number and you never received a verification letter.¹⁴

If the process stalls, you fail the knowledge-based questions, or the delay is causing financial hardship, the Taxpayer Advocate Service handles cases like these and takes requests through its website.¹ An unresolved hold does not expire on its own. The return stays frozen until you respond.

How Long Until Your Refund Arrives

After you successfully verify, the IRS says it can take up to nine weeks to finish processing your return and issue your refund. Check status two to three weeks after verification using the “Where’s My Refund?” tool on irs.gov.⁵

How to Avoid Going Through This Again

Once you’ve been through verification, an Identity Protection PIN can keep it from happening again. An IP PIN is a six-digit number you include on your return each year, and the IRS won’t accept a return filed under your Social Security number without it.¹⁵

Anyone with a Social Security number or ITIN who can verify their identity is eligible. The fastest way to enroll is through the IRS Online Account tool. A new IP PIN is generated for you each year.¹⁶

If you can’t verify your identity online, submit Form 15227 to request an IP PIN by mail, provided your adjusted gross income on your most recently filed return is below $84,000, or $168,000 if married filing jointly. The IRS will call to verify your identity by phone, then mail your IP PIN within four to six weeks. After that first year, the PIN arrives by mail annually.¹⁶

1
Taxpayer Advocate Service. Identity Verification and Your Tax Return
2
Social Security Administration. Employer Reconciliation Process
3
Internal Revenue Service. Understanding Your CP5071 Series Notice
4
Internal Revenue Service. Understanding Your Letter 4883C
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Internal Revenue Service. Verify Your Return
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Internal Revenue Service. Understanding Your Letter 5747C
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Internal Revenue Service. Dirty Dozen Tax Scams for 2026 – IRS Reminds Taxpayers to Watch Out for Dangerous Threats
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Internal Revenue Service. Ways to Tell if the IRS Is Reaching Out or if It’s a Scammer
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Internal Revenue Service. Form 1040, U.S. Individual Income Tax Return
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Internal Revenue Service. How to Register for IRS Online Self-Help Tools
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Internal Revenue Service. Before Calling the IRS, People Should Know What Info They’ll Need to Verify Their Identity
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Internal Revenue Service. IRS Taxpayer Assistance Centers Providing In-Person ITIN Document Review
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Internal Revenue Service. IRS Identity Theft Victim Assistance – How It Works
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Internal Revenue Service. When to File an Identity Theft Affidavit
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Internal Revenue Service. Frequently Asked Questions About the Identity Protection Personal Identification Number (IP PIN)
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Internal Revenue Service. Get an Identity Protection PIN