IRS CP12, explained in plain English
Quick answer: The IRS corrected a math or processing error on your return and your refund changed. Often this is money in your favor. Your deadline: 60 days to dispute the correction.
What it means
The IRS corrected a math or processing error on your return and your refund changed. Often this is money in your favor.
Your deadline
60 days to dispute the correction.
What to do
If you agree, do nothing; the corrected refund arrives in four to six weeks. If you disagree, call or write within 60 days.
What not to do
Do not file an amended return to fix it; that crosses wires with the correction already in motion.
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 CP12 serious?
It deserves attention, not panic. The IRS corrected a math or processing error on your return and your refund changed. Often this is money in your favor. Handled inside the deadline, it is routine paperwork.
Can Zero Fuss Taxes respond to my CP12 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.