Reviewed by Main AI · Updated July 2026
A CP12 means the IRS corrected your return and the change is in your favor — usually a different refund than you expected. Review it; if you disagree you generally have 60 days to respond.
A CP12 is one of the friendlier IRS notices: they found an error on your return, fixed it, and the correction changed your refund amount. Often the refund goes up, sometimes it’s adjusted down but still a refund. Verify what they changed against your records — corrections are usually right but not always, and accepting a wrong one can echo into future years. If you disagree, you have about 60 days to respond and have the original figures considered. If you agree, no action is needed; the adjusted refund arrives on its own timeline.
If you agree with the correction, no — the adjusted refund is processed automatically. Respond only if you disagree.
The IRS corrected an error — commonly a math mistake or a credit calculated differently. The notice itemizes exactly what changed.
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