A CP501 is a reminder notice. The IRS sends it when you still owe money on one of your tax accounts and it hasn't received your payment, or any response, after an earlier bill such as a CP14. It doesn't mean the IRS is about to take your property. It does mean the account is moving along the collection process, and each step adds cost. A phone call or an online payment plan today can stop the escalation.
Why you got a CP501
The IRS says you received a CP501 because it has not received payment or a response to a previous notice asking you to pay. Typical reasons:
- The first bill went unpaid. You got a CP14 (or similar) and didn't pay in full or make arrangements.
- You paid part of it. A partial payment lowers the balance, but the rest is still due, and penalties and interest keep adding.
- The first notice never reached you. If you moved, the earlier bill may have gone to an old address. File Form 8822 to update your address.
- A payment didn't post correctly. A payment applied to the wrong year or form can make an account look unpaid.
What the CP501 says
Look at these parts of the notice:
- The amount you owe, including tax, penalties and interest. The "Your bill summary" section shows the interest charged so far.
- The due date for payment.
- The tax form and tax year the balance relates to.
- Your payment options, plus a return envelope and a payment stub for the bottom of the page.
- A toll-free number to call if you disagree.
- Collection Appeals Program (CAP) information. The IRS says you can request a CAP appeal before collection action takes place by following the instructions on the notice. CAP is a quick review by the IRS Independent Office of Appeals of a proposed lien, levy or similar action. You can't take a CAP decision to court.
What to do
- Check the balance. Sign in to your IRS Online Account to see your balance, payment history and a copy of the notice. Compare it with your records.
- If you agree and can pay, pay by the due date. Pay online through your Online Account or IRS Direct Pay, or mail a check in the envelope provided. Include the bottom part of the notice so the payment is credited correctly.
- If you agree but can't pay in full, set up a payment plan. Apply through the Online Payment Agreement application, or mail Form 9465, Installment Agreement Request. Individuals can apply online for a long-term plan if they owe $50,000 or less in combined tax, penalties and interest and have filed all required returns. A short-term plan (180 days or less) has no setup fee. See IRS payment plans.
- If you disagree, call right away. Use the toll-free number on the notice. Have canceled checks, bank statements or an amended return ready.
- If you made a mistake on the return, file Form 1040-X, Amended U.S. Individual Income Tax Return. Our amended return guide explains how.
If paying anything right now would keep you from covering basic living expenses, call and ask about a temporary delay. The IRS calls this currently not collectible status. Penalties and interest still accrue, and the IRS may still file a lien.
What happens if you ignore it
The IRS says that if you don't pay, make arrangements or call, it can file a Notice of Federal Tax Lien. A lien is a public notice to your creditors that the government has a claim to your current and future property. It can make it harder to get credit. If a lien is filed, you'll receive a Letter 3172 explaining your hearing rights.
Costs also keep climbing:
- Failure-to-pay penalty: 0.5% of the unpaid tax for each month or part of a month, up to 25%, according to the IRS.
- Interest: the IRS underpayment rate was 7% for most of 2026 (6% in April–June). It's set each quarter and accrues daily.
The collection notices usually continue in this order, though not everyone gets every step:
| Step | Notice | What it means |
|---|---|---|
| 1 | CP14 | First bill |
| 2 | CP501 | Reminder (you are here) |
| 3 | CP503 | Second reminder |
| 4 | CP504 | Notice of intent to levy; state tax refund can be taken |
| 5 | LT11 / Letter 1058 or CP90 / CP297 | Final notice of intent to levy with a 30-day right to a Collection Due Process hearing |
Say $4,000 of tax is unpaid. At 0.5% a month, the failure-to-pay penalty adds $20 each month. If you set up an approved payment plan after filing on time, the IRS cuts that rate to 0.25%, or $10 a month on the same amount, while the plan is in effect. Interest is charged either way until you pay in full.
An optional CP14 payment response kit is available on this site, but this page covers what you need.
Is this notice real?
The IRS normally contacts you first by mail. To verify a CP501, sign in to your IRS Online Account and check that the balance and notice appear there, or call the IRS at a number listed on IRS.gov. Real payments go to the "United States Treasury" through IRS.gov/payments or by check. No one from the IRS will demand payment by gift card or threaten immediate arrest. Our guide on IRS scams has more warning signs.
Frequently asked questions
Is a CP501 the same as a final notice?
No. A CP501 is a reminder. Your right to a Collection Due Process hearing comes later, with a final notice of intent to levy such as an LT11. But don't wait for that. Options are easier to set up now.
Am I charged interest on a CP501 balance?
Yes. The IRS charges interest on any unpaid balance until it's paid in full. The notice shows how much interest has been charged so far.
Can the penalty be removed?
Sometimes. The IRS says that if you contact it by the payment due date, it may be able to remove the penalty, depending on your situation. Our penalty relief guide explains reasonable cause and other options.
I can't afford the monthly payment the online tool suggests. What now?
Call the number on the notice. The IRS can look at your income and expenses and may offer other arrangements, including a partial-payment plan or a hardship delay. A Low Income Taxpayer Clinic may help for free or a small fee if you qualify.
Sources
- Internal Revenue Service (IRS), "Understanding your CP501 notice". irs.gov
- IRS, Publication 594, The IRS Collection Process (Rev. 1-2026). irs.gov
- IRS, Publication 1660, Collection Appeal Rights. irs.gov
- IRS, "Failure to pay penalty". irs.gov
- IRS, "Quarterly interest rates". irs.gov
- IRS, "Payment plans; installment agreements". irs.gov
IRSV.com is an independent guide and is not affiliated with the IRS. This page is general information, not tax or legal advice. Rules change; confirm details on IRS.gov or with a tax professional. Found an error? Tell us.