high urgencytypical response window: 30 days
IRS Notice 5071C / 4883C: Identity Verification
What it means
The IRS flagged your return for possible identity theft — refund is frozen until you verify.
What to do
Verify online or by phone per the letter's instructions.
Verify it's real. The IRS contacts you by mail first — never by phone, email, or text demanding payment. The notice includes a number in the top-right corner and instructions on irs.gov. When in doubt, log into your IRS online account rather than calling a number on the letter.
FAQ
What is IRS notice 5071C / 4883C?
The IRS flagged your return for possible identity theft — refund is frozen until you verify.
How long do I have to respond to 5071C / 4883C?
You typically have 30 days from the notice date. The deadline is printed on the notice itself — use that, not this estimate.
Should I get professional help for 5071C / 4883C?
Usually not required — but if the amounts are wrong or you also owe other years, a professional review is cheap insurance.