IRS CP11, explained in plain English
Quick answer: The IRS corrected a miscalculation on your return and the change means you owe money. Your deadline: Pay by the due date; 60 days to dispute.
What it means
The IRS corrected a miscalculation on your return and the change means you owe money.
Your deadline
Pay by the due date; 60 days to dispute.
What to do
Check their math against your return first. Pay if they are right; contact the IRS within 60 days if they are not.
What not to do
Do not pay first and plan to argue later. After 60 days the change hardens and your options shrink.
Want it handled for you?
Take a photo of the letter, every page, and send it through our secure portal. Someone from our office reads it, explains it in plain English, and manages the response. Most letters are resolved without you ever waiting on hold with the IRS.
Upload my letterEducational summary based on IRS guidance, reviewed June 2026. Not legal or tax advice; deadlines and details come from your actual letter. Source: irs.gov.
Is the CP11 serious?
It deserves attention, not panic. The IRS corrected a miscalculation on your return and the change means you owe money. Handled inside the deadline, it is routine paperwork.
Can Zero Fuss Taxes respond to my CP11 for me?
Yes. Upload every page of the letter to our secure portal, and someone from our office reviews it, explains your options in plain English, and prepares the response. IRS letters are a year-round service for us, not a seasonal one.