You owe more money
Got an IRS CP11Notice? Here's What It Means
Deadline & urgency
CP11 typically gives you a window to disagree. If you miss it, the IRS may treat the adjustment as final and proceed to collection on the balance.
What this notice means
CP11 means the IRS changed your return and you owe additional tax as a result. The notice explains the adjustment and the new balance.
It often includes interest and may include penalties depending on the change.
Why did I get this?
The IRS found a math error, missing income, incorrect credit, or other issue on your return and corrected it.
The correction increased your tax.
What should I do next?
Review the changes line by line against your records.
If you agree, pay the amount due or arrange payment; follow the response instructions if a signature is required.
If you disagree, reply by the deadline with a written explanation and supporting documents.
Frequently asked questions
Can I fix my return instead?
Depending on the issue, you may need to respond to the notice and/or file an amended return. Follow the instructions on your CP11.
Why are there penalties?
Some adjustments trigger accuracy-related or other penalties. Your notice should itemize them; you may be able to request penalty relief in qualifying cases.
Is this a scam?
Verify the notice: IRS letters have notice numbers, explain rights, and direct you to official payment channels. When in doubt, use IRS.gov to confirm contact options.