On the paper
Read the “What we changed on your return” section, the tax period, the resulting balance, and the date for contacting the IRS if you disagree.
Find the date printed on your notice or letter. The paper notice and the current official IRS instructions control, even where this page differs.
General next steps
- Compare each changed line with the filed return and the records supporting that line.
- Separate agreement with a correction from agreement with the resulting tax, penalty, or interest calculation.
- Use the contact and payment instructions printed on CP11 for the account-specific response.
Timing
The date printed on CP11 controls payment and disagreement steps. The IRS says formal reversal and Tax Court rights can be affected if it is not contacted by the stated date.
What this page cannot tell you
This page cannot determine whether the correction or amount due is right, whether a change can be reversed, or how a response affects procedural rights.
Official sources
If anything on this page differs from your notice or from current IRS instructions, follow the notice and the IRS.