IRS Notices
IRS IP PIN CP01A: What It Means and How to Use It (2025)
The short answer: the IRS IP PIN CP01A is a notice that delivers your Identity Protection PIN — a six-digit code printed on the letter. You enter it on your federal tax return so no one can file a fake return using your Social Security number. It's not a bill and not a problem. It expires at year-end, so keep it safe until you file.
⏱ Good to know: the IP PIN on your CP01A is valid for the full calendar year and is replaced by a new one each year — the next CP01A usually arrives in late December or early January. Use the most recent number on every federal return you file this year. Lose it before filing and you'll need to retrieve it online before the IRS will accept your e-filed return.
Why you got a CP01A notice
The IRS sends a CP01A because you have an Identity Protection PIN (IP PIN) on file. You're in this program for one of two reasons: you were a confirmed victim of tax-related identity theft, so the IRS enrolled you automatically, or you chose to opt in to protect yourself. The program is now open to anyone with a Social Security number or ITIN — you don't have to be a victim to use it.
The notice itself is simple. It contains your name, the tax year, and a six-digit code. The IRS explains the letter on its own page, Understanding your CP01A notice. Think of the IP PIN like a password for your tax return — it proves the return came from you.
One thing the CP01A is not: a bill, an audit, or a sign you did anything wrong. If you've been worried that a letter from the IRS means trouble, this one is good news — it's protection, not collection.
What the IP PIN actually does
Tax-related identity theft works like this: a criminal files a fake return early in the season using a stolen Social Security number, then collects the refund before the real taxpayer files. The IP PIN shuts that door. Without your current six-digit code, the IRS will reject any electronically filed return tied to your SSN — including one a thief tries to file.
That's why the number matters so much. It only works if you actually use it. A code sitting unused in a drawer protects nobody.
What happens if you don't use it (or lose it)
The IP PIN isn't optional once you've been issued one. Here's how things play out if it's missing when you file:
- E-file rejected. File electronically without the correct IP PIN and your return bounces back. You can't get past this step until you enter the right number.
- Paper return delayed. Mail a paper return without your IP PIN and the IRS still accepts it, but routes it through extra identity verification — which can push your refund back by weeks or even months.
- Refund held. The longer your identity stays unverified, the longer any refund sits. For families counting on that money, the delay is the real cost.
None of this is a penalty — it's a safeguard. The fix is always the same: find your current IP PIN and enter it before you file.
How to use your IP PIN CP01A, step by step
Keep this checklist near your tax documents this season:
- Store the CP01A somewhere safe. Treat the six-digit number like a password. Don't toss the letter and don't store the number in an unsecured email or text.
- Enter the IP PIN when you file. Tax software prompts you for it; on a paper Form 1040 it goes in the box next to your signature. A spouse with their own IP PIN enters theirs too.
- Use it on every federal return this year. That includes current-year, prior-year, and amended returns filed during the calendar year.
- Give it only to your preparer. If someone else files for you, hand them the number directly — never email it or post it anywhere.
- Expect a new one next year. Each January the IRS issues a fresh IP PIN. Last year's number won't work, so watch your mail for the next CP01A.
Lost the letter? How to retrieve your IP PIN
If the CP01A is gone, don't panic and don't file without the number. You have two paths:
- Online (fastest): log into your account and use the Get an IP PIN tool at IRS.gov. After you verify your identity, your current number appears on screen.
- By phone or mail (slower): if you can't verify online, the IRS can mail a replacement CP01A to your address of record. This takes longer, so build in extra time before any filing deadline.
Because the IP PIN is so sensitive, scammers love to imitate it. A real IP PIN reaches you only by postal mail or through your verified IRS account — never a phone call, text, or email. If you're unsure whether a message is genuine, our guides on how to tell if an IRS letter is real and whether the IRS actually calls you walk through the red flags.
Not sure what your IRS notice means?
Send us a photo of any letter you received. An experienced tax professional will tell you exactly what it is and what — if anything — you need to do. It's free, confidential, and there's no pressure.
IP PIN CP01A questions, answered
Is a CP01A notice a bill or a problem?
No. A CP01A is not a bill, an audit, or a sign of trouble. It's a security letter that delivers your Identity Protection PIN — a 6-digit code you enter on your tax return so no one else can file using your Social Security number. You don't owe anything because of it.
I lost my CP01A — how do I get my IP PIN?
Log into your IRS online account and use the Get an IP PIN tool at IRS.gov to view your current number. If you can't verify online, you can call the IRS to request that a replacement CP01A be mailed, though that takes longer. Do not file without it if you've been issued one.
How long is the IP PIN on my CP01A good for?
One calendar year. The IRS issues a brand-new IP PIN every year, usually mailing the next CP01A in late December or early January. Use the number on your most recent CP01A for every federal return you file during that year, including prior-year and amended returns.
What happens if I file without my IP PIN?
An e-filed return without the correct IP PIN will be rejected. A paper return filed without it still gets processed, but the IRS subjects it to extra identity checks, which can delay your refund by weeks or months. The fix is simple: find your IP PIN and enter it before you file.
Will the IRS ever call or email asking for my IP PIN?
Never. The IRS sends your IP PIN only by postal mail on the CP01A or through your verified online account. Anyone who calls, texts, or emails asking for your IP PIN is a scammer. Share it only with your trusted tax preparer when you file, and never post it or send it by email.
This guide is general information, not tax or legal advice for your specific situation. Eligibility for IRS programs depends on individual facts and circumstances; no outcome is guaranteed.