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Your IRS CP11 Notice, Explained
Also called: Notice CP11
Last reviewed 2026-07-12
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What this notice usually means
IRS Notice CP11 tells you the IRS corrected one or more mistakes on your tax return. As a result, the amount you owe has changed. Your notice explains exactly what was changed and how it affected your balance. If you do not contact the IRS by the date on your notice, you can lose your formal right to have the change reversed and your right to appeal to the U.S. Tax Court.
See every source line for this notice
“Pay the amount owed by the date shown on your notice to avoid additional penalties and interest.”
“To avoid interest charges, full pay the amount owed by the due date shown on your notice. If you don't pay in full by that date, interest will accrue on the unpaid balance from the date the return was due.”
“If you don’t contact us by the date shown on your notice, you will lose formal rights to have the change(s) reversed, as well as your right to appeal our decision to the U.S. Tax Court.”
What to do now
- 1
Read what changed on your notice
Your CP11 notice lists the specific changes the IRS made and how they affected the amount you owe.
- 2
Pay by the date on your notice if you agree
Paying the amount owed by the date shown on your notice helps you avoid added penalties and interest.
- 3
Call the IRS by the deadline if you disagree
Contact the IRS at the number on your notice by the date shown. Waiting past that date can cost you formal rights to reverse the change.
- 4
Look into a payment plan if you cannot pay in full
If you cannot pay the full amount now, you can ask about a payment plan or other arrangement.
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Your notice lists the exact date to pay or to contact the IRS if you disagree. Missing that date can mean losing your formal right to have the change reversed and your right to appeal to the U.S. Tax Court.
“We corrected one or more mistakes on your tax return. As a result, the amount you owe has changed.”
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Sources
- Internal Revenue Service (irs.gov)Retrieved 2026-07-12
Last reviewed 2026-07-12
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