IRS Notice CP12: Correction Resulted in Overpayment

What does an IRS CP12 notice mean?

A CP12 notifies you that the IRS corrected one or more errors on your return and, as a result, you are due a refund (or a larger refund than you claimed). The notice explains the changes and the new refund amount. This is generally good news and usually requires no action.

Why did you receive a CP12?

The IRS adjusted a miscalculation, a credit, or a reported figure in your favor — for example, correcting a math error or applying a credit you were entitled to but computed differently.

How to respond to a CP12 notice

If you agree with the correction, you do not need to do anything; the refund should arrive within a few weeks if you have no other debts that offset it. If you disagree with the IRS's changes, contact the agency within 60 days to dispute and provide documentation supporting your original figures.

What happens if you ignore it?

Nothing negative happens if you agree — the refund is issued automatically. However, if the IRS's correction is actually wrong and you wait beyond 60 days, restoring your original numbers becomes more difficult.

Common resolutions

• No action needed if you agree
• Contact the IRS if you disagree

Related IRS notices

• CP11 — Changes to Tax Return — Amount Owed
• CP13 — Refund Adjustment — No Refund Due
• CP21A — Adjusted Return — Refund Due
• CP24 — Estimated Tax Overpayment