Notice code CP501
You got a CP501. It is a reminder that you still owe.
You are holding a CP501, a second reminder that your tax bill is still unpaid.
Pay by the due date printed on it, set 21 calendar days after the IRS sent it.
A licensed tax professional can check the amount and talk through paying over time before a stronger notice comes.
Briefing for CP501
IRS pageThe first IRS reminder that you owe a balance you have not paid yet.
Use the payment due date printed on the notice.
- Pay the full balance by the due date.
- Set up a payment plan if you cannot pay it all.
- Call the IRS if the bill leaves out a payment you made.
Which numbers matter?
21 calendar days
Your due date falls 21 calendar days after the IRS sent the letter, not after it reached you.
Find the due date on the notice and mark it today.
$50,000
If you owe $50,000 or less and your returns are filed, you can apply for a Simple Payment Plan.
Add up everything you owe before you apply for a plan.
10 years
Most people on a Simple Payment Plan get up to 10 years to pay the balance.
Pick a monthly amount you can pay every single month.
Settle the CP501 before CP503 arrives
Your CP501 balance is due 21 calendar days after the IRS sent it, and interest grows every day.
Next come a stronger reminder and a levy warning, so a licensed tax professional checks the balance and plans payments with you.
Call now and sort out the balance on your CP501 while it is still at the reminder stage.
Call 855-964-5291What happens when you call
- You call during business hours and say you have a CP501.
- A licensed tax professional asks for the date, the amount and the tax years on the letter.
- You hear your options for this notice and decide what to do. Nothing is filed without your yes.
A licensed tax professional answers, not the IRS. The call costs nothing, and you give up nothing by calling. IRS Code Lookup is a private tax help service.
Would you rather send your CP501 details?
Sending the balance, tax year and due date from your CP501 lets someone check the amount first.
A payment the IRS missed is easier to spot when the notice and your records sit side by side.
What changed recently?
Since 2026, the IRS offers Simple Payment Plans to individuals who owe $50,000 or less and are current on filing. Most taxpayers get up to 10 years, and business taxpayers now qualify too.
Source: Simple Payment Plans for individuals and businesses.
What is the IRS saying?
The letter repeats the balance and gives a new due date. It also warns that the IRS can file a notice of federal tax lien if you do not pay or call.
Why did you get it?
The earlier bill was not paid in full. Take Rosalind. She owes on her 2024 return and missed the CP14 date by a few weeks. The CP501 is the second letter in the series.
Is it real?
A real CP501 has the code top right and the IRS toll-free number in it. You can view this notice in your IRS online account.
Still unsure? Search the code on the IRS notice search, or use the real or fake checklist.
When is your deadline?
Use the payment due date printed on the notice. Contact the IRS promptly if the bill lists a payment you already made.
What if you agree?
Pay online or by mail with the slip. If you cannot pay it all, you may qualify for a payment plan through the online application.
What if you don't agree?
Call the toll-free number on the notice. Have proof of any payment the IRS has not credited.
What happens if you ignore it?
The IRS can file a lien, interest keeps adding up, and more penalties may apply. A CP503 and then a CP504 come next.
What should you read next?
Questions people ask
Is a CP501 serious?
It is a reminder, not a levy notice. It does warn that a lien can be filed if you do not pay or call.
Am I charged interest on a CP501 balance?
Yes. The IRS charges interest on the unpaid balance until it is paid in full.
Can I set up a payment plan after a CP501?
Yes, if you qualify. Our payment plan page shows the online steps.
What comes after a CP501?
A CP503 is the next reminder. After that, a CP504 says the IRS intends to levy.
Sources
- Understanding your CP501 notice. Published by irs.gov.
- Failure to pay penalty. Published by irs.gov.
- Simple Payment Plans for individuals and businesses. Published by irs.gov.
Last checked October 2026
What to do now
- Find the due date on your CP501 and mark it on your calendar.
- Compare the balance with your own records and bank statements.
- Pay in full online or by mail with the payment slip.
- If you cannot pay it all, apply for a payment plan online before the due date.
Call now and sort out the balance on your CP501 while it is still at the reminder stage.
A licensed tax professional answers, not the IRS. The call costs nothing, and you give up nothing by calling. IRS Code Lookup is a private tax help service.