IRS notice decoder
Proposed changes to a return
Every proposed changes to a return notice and letter we have decoded, by number. Open one for what it means, the date that counts and the first steps.
- CP2000a proposed change because income didn't match
A CP2000 proposes a change because income reported by others doesn't match your return. It isn't a bill. Agree or disagree by the date on it.
- CP2501the IRS asks about income that doesn't match
A CP2501 says income reported by employers or banks doesn't match your return. It isn't a bill, but it needs an answer by the date on it.
- 4800Cthe IRS is proposing a change to your return
A 4800C proposes a change to your return. Read the changes, decide if you agree, and send the response form by the date the IRS gives.