Income mismatch & return changes
The IRS corrected an error on your return and the correction changes your refund — usually the math-error family's good-news branch: a refund is coming, or a bigger one than you expected.
Routine
The IRS corrected an error on your return and the correction changes your refund — usually the math-error family's good-news branch: a refund is coming, or a bigger one than you expected.
Why you got it: Processing found a math or clerical error affecting the refund amount — a mis-added credit, a wrong standard deduction, a transposed figure.
Not a bill. But read the change before celebrating: if the IRS's correction is wrong in your favor today, it's still your return — and if it reduced your refund, the same 60-day abatement right as CP11 protects you.
Your first move: Compare their change to your return. If it shorted you, the 60-day abatement request is your move. If it's right, correct your copy of the return and wait for the refund.
Every clock runs from this date — not from the day the letter reached you.
Keep the notice with your return copy.
Inside 60 days, in writing, certified mail.
If the notice says a refund issued but nothing arrived, trace it through your online account.
Only needed if you disagree: the abatement request to the address on the notice.
Refund-themed fakes are an industry. A real CP12 never includes a link to 'claim' your refund.
If you agreed: nothing — the refund issues. If the IRS was wrong and the 60 days pass, the correction becomes final like any other.
Where this sits on the ladder: This letter stands on its own track — see the collection ladder for the enforcement road.
One payment. No subscription. Yours to keep — every notice, every letter, every script.