To resolve this, start by finding your 6-digit IP PIN:
- This will be on the CP01A letter you received in December or January for your 2021 taxes. IP PINs for prior tax years won't work.
- If you lost your letter or never received one, retrieve your IP PIN online at IRS Get An Identity Protection PIN (IP PIN).
- If you're unable to retrieve your IP PIN online, you can have it reissued (allow up to 21 days).
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