Notice code CP11
You got a CP11. The IRS corrected your return.
You got a CP11, so the IRS changed your return and the amount you owe.
If you disagree, contact the IRS by the date printed on the notice to keep your right to a reversal.
If you need help checking the proposed amount or responding before the deadline, send the notice through the form or call.
Briefing for CP11
IRS pageThe IRS fixed mistakes on your return and the amount you owe changed.
There is no fixed day count on the IRS page.
- Pay the new amount by the date on the notice.
- Call the IRS by that date and ask it to reverse the change.
- Set up a payment plan if you agree but can't pay.
Check your CP11 change before the date
Your CP11 has no set day count, so the date printed on the notice is your deadline.
Miss it and you lose your reversal and Tax Court rights, but a licensed tax professional can answer for you.
Use the form to send your CP11, or call now to compare the corrected numbers with your forms.
Call 855-964-5291What happens when you call
- You call during business hours and say you have a CP11.
- 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 CP11 details?
Your CP11 lists each change the IRS made and the new balance it shows.
With those details, a licensed tax professional can check the corrected numbers against your return and records.
What is the IRS saying?
The notice lists what was changed and how it affected your balance. Common changes are math errors and credits claimed without the numbers to back them.
Why did you get it?
Take Dev. His 2025 return added two lines wrong, and the child credit he claimed did not match the forms on file. The CP11 shows the corrected numbers.
Is it real?
The notice has the code top right and a section headed with where to find more information, including a toll-free number.
Still unsure? Search the code on the IRS notice search, or use the real or fake checklist.
When is your deadline?
There is no fixed day count on the IRS page. The date printed on your notice is the one that matters for keeping your right to a reversal and to appeal in Tax Court.
What if you agree?
Pay by the date on the notice to avoid more penalties and interest, or set up a plan to pay over time.
What if you don't agree?
Call the toll-free number by the date shown. The IRS says it will reverse most changes it made if you ask, without an explanation or documents. If your papers do not support the return, the case may go to audit, and audit staff contact you within 6 weeks.
What happens if you ignore it?
After the date passes you lose formal rights to have the change reversed and to appeal to the U.S. Tax Court.
What should you read next?
Questions people ask
Can I ask the IRS to reverse a CP11 change?
Yes. The IRS says it reverses most changes it made if you contact it by the date on the notice.
What if I miss the CP11 date?
You lose the formal right to a reversal. The IRS says it will still look at supporting papers sent later.
Does a CP11 mean an audit?
No, but if your reply does not support the return, the case can be sent to audit.
Should I file an amended return after a CP11?
Only if you have something new to report. Otherwise reply to the notice itself.
Sources
- Understanding your CP11 notice. Published by irs.gov.
Last checked October 2026
What to do now
- Find the date printed on your CP11 and mark it on your calendar.
- Compare each change on the notice with your return and your tax forms.
- If you disagree, call the toll-free number on the notice before that date.
- If you agree but can't pay, ask about a plan to pay over time.
Use the form to send your CP11, or call now to compare the corrected numbers with your forms.
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.