Your refund was changed

Got an IRS CP12Notice? Here's What It Means

Deadline & urgency

If you disagree, note the response deadline on CP12. If you don’t reply in time, you may lose the chance to contest the change informally.

What this notice means

CP12 means the IRS adjusted your return and it affected your refund—usually a smaller refund or a balance due instead of a refund.

The notice describes what changed and how it impacts your bottom line.

The IRS caught a discrepancy (credits, withholding, dependents, income, etc.) and recalculated your return.

Your original refund amount was overstated based on their correction.

Compare the IRS math to your records and tax software or preparer copies.

If you agree, you typically don’t need to do anything beyond cashing a reduced refund check or paying if now due.

If you disagree, respond by the deadline with documentation.

Get a plain-English breakdown in the IRSDecode decoder tool.

Will I still get a refund?
Maybe a smaller one, or none, depending on the adjustment. The notice states the outcome.
Can I amend my return after CP12?
Sometimes, if you discover an error. Coordinate with the IRS response process on your notice so you don’t duplicate or conflict with their adjustment.
What if the IRS took my whole refund for a debt?
That may be a different notice (offset). CP12 is about recalculating the return itself; read your letter for the exact reason.