High Risk
Understanding IRS Notice CP11:
Changes to Your Tax Return — Balance Due
and How to Respond
Last Verified:
The Raw Code: What CP11 Actually Says
The IRS changed your tax return because they believe there is a miscalculation. You now owe additional taxes. Pay by the due date to avoid further penalties and interest.
The Detangler™ — Plain English
They found a math error — or think they did. Now they say you owe more. This could be their mistake. Don't just pay it. Verify their calculation first, then respond if it's wrong.
What You Must Do Now
Pay the balance or dispute within 60 days using the contact info on the notice.
Get Free EA AssessmentFrequently Asked Questions
What is IRS Notice CP11?
The IRS changed your tax return because they believe there is a miscalculation. You now owe additional taxes. Pay by the due date to avoid further penalties and interest.
What should I do when I receive CP11?
Pay the balance or dispute within 60 days using the contact info on the notice.
How serious is IRS Notice CP11?
High Risk. Review and respond promptly to avoid escalation.