A CP503 is the IRS's second reminder that you owe money on one of your tax accounts. The IRS sends it because it hasn't received your payment or a response to earlier notices. The Taxpayer Advocate Service calls it the "2nd Notice." This is a good time to get serious. The IRS can't take your wages or bank account based on a CP503 alone, but the next notice, the CP504, is a formal notice of intent to levy. Acting now keeps the most options open.
Why you got a CP503
You got a CP503 because a balance is still unpaid and the IRS hasn't heard from you. Usually that means:
- Earlier bills went unanswered. You received a CP14 and a CP501 (or other balance due notices) and didn't pay or call.
- You paid only part of it. The rest, plus penalties and interest, is still due.
- Your mail went somewhere else. If you moved, earlier notices may not have reached you. Update your address with Form 8822.
- A payment was misapplied. If you already took care of it, the IRS says to call anyway so your account reflects what you did.
What the CP503 says
The notice explains:
- How much you owe, including additional penalties and interest added since the last notice.
- The payment due date. The IRS says you must pay the entire balance by that date to avoid additional penalties and interest.
- The tax form and year involved.
- Payment options, an envelope, and a payment stub for the bottom of the page.
- A toll-free number for questions or disagreements.
- Your right to a Collection Appeals Program (CAP) appeal before collection action. CAP lets the IRS Independent Office of Appeals review a proposed lien or levy. It is fast, but you can't go to court if you disagree with the result.
Check the return address first. The Taxpayer Advocate Service points out that some balance due notices come from state tax agencies, not the IRS.
What to do
- Review your account. Sign in to your IRS Online Account to see the balance, recent payments and the notice itself.
- If you agree and can pay, pay now. Use your Online Account, IRS Direct Pay or another option at IRS.gov/payments, or mail a check payable to the "United States Treasury" with the payment stub.
- If you can't pay in full, pay what you can and apply for a plan. The online application is fastest. Individuals qualify to 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 of up to 180 days has no setup fee for balances under $100,000. You can also call the number on the notice or mail Form 9465.
- If you disagree, call the toll-free number on the notice. Do it before the due date if you can. Have your records ready.
- If you think a penalty should be removed, the Taxpayer Advocate Service notes you can use Form 843 or send a signed statement explaining why. Notice 746 has instructions.
For 2026, the IRS lists long-term plan setup fees of $29 (online) or $107 (phone, mail or in person) with automatic direct debit, and $69 (online) or $178 (phone, mail or in person) with other payment methods. Low-income individuals can have the direct-debit fee waived. Our payment plans guide compares the choices.
If you truly can't pay anything, ask about currently not collectible status. If you can't pay the full amount even over time, an offer in compromise may be worth checking with the IRS pre-qualifier tool. Be cautious of ads promising to settle tax debt for "pennies on the dollar." Most people don't qualify for that, and you can apply directly with the IRS. If you'd like help preparing a payment plan request, an optional installment agreement kit is available.
What happens if you ignore it
According to the IRS, if you don't pay, make arrangements or call, it may file a Notice of Federal Tax Lien if it hasn't already. A lien is a public claim on your current and future property. It can affect your ability to get credit, sell property or refinance. You would get a Letter 3172 with your hearing rights. Learn more in our federal tax lien guide.
The next notice is usually the CP504, a notice of intent to levy. After that, the IRS sends a final notice with your right to a hearing, such as an LT11 or CP90. Then it can levy wages, bank accounts and other property.
Penalties and interest also keep adding up. The failure-to-pay penalty is 0.5% of the unpaid tax per month, up to 25%. Once a notice of intent to levy is issued and 10 days pass without payment, the IRS says the rate rises to 1% per month.
Is this notice real?
Real IRS notices arrive by mail and can be checked in your IRS Online Account. If the notice doesn't show up there, call the IRS using a number from IRS.gov. Pay only through IRS.gov/payments or by check to the "United States Treasury." The IRS won't ask you to pay with gift cards or prepaid debit cards. See our IRS scams guide.
Frequently asked questions
How long do I have to pay a CP503?
Pay by the due date printed on the notice. The IRS says paying the full balance by that date avoids more penalties and interest. If you need more time, a short-term payment plan gives you up to 180 days.
Will a CP503 hurt my credit score?
The notice itself isn't reported to credit bureaus. The Taxpayer Advocate Service says federal tax liens no longer appear on credit reports, but a filed lien is a public record, and lenders may still find it through other sources.
I already paid. What should I do?
Call the number on the notice anyway. The IRS says that if you've already taken corrective action, you should still call so your account reflects it. Payments can take up to three weeks to post.
Can I still get a Collection Due Process hearing?
Yes, later. That right comes with a final notice of intent to levy, such as an LT11 or CP90, and with a lien filing notice (Letter 3172). Each gives you a deadline to file Form 12153. See Collection Due Process hearings.
Sources
- Internal Revenue Service (IRS), "Understanding your CP503 notice". irs.gov
- Taxpayer Advocate Service, "Notice CP503". taxpayeradvocate.irs.gov
- IRS, Publication 594, The IRS Collection Process (Rev. 1-2026). irs.gov
- IRS, Publication 1660, Collection Appeal Rights. irs.gov
- IRS, "Payment plans; installment agreements". irs.gov
- IRS, "Failure to pay penalty". 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.