The CP11 notice means that the IRS has made changes to your return because they believe there's a miscalculation and now you owe money as a result.
If you agree with the changes the IRS made, you'll need to:
- Pay the amount owed by the date on the notice (see the electronic payment options). If you can't pay the full amount you owe, you can make payments
- Correct the copy of your tax return that you keep for your own records
If you don't agree with the changes, contact the IRS within 60 days from the date of your notice. You can do this:
- By telephone—the number is on your notice, and calling is the fastest way to resolve many errors
- By mail—include a copy of the notice and allow 30–60 days, or more, for a resolution
