IRS Notice CP2501: Income mismatch — explain the difference
Quick answerAn early Automated Underreporter letter: income or payments reported to the IRS don't match your return, and the IRS asks you to explain before proposing changes.
Letter / noticeCP2501
MeaningIncome mismatch — explain the difference
Action needed?Yes — see steps
What happens next
Respond by the date on the notice. If not resolved, a CP2000 may follow.
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What you should do
- Compare each item with your records
- Send an explanation and documents
- Amend only if you agree you left something out
Scam check: the IRS first contacts you by mail. Use only the phone numbers printed on your letter or on IRS.gov — never ones from a text, email or unofficial site.
Frequently asked questions
What does IRS Notice CP2501 mean?
An early Automated Underreporter letter: income or payments reported to the IRS don't match your return, and the IRS asks you to explain before proposing changes.
What should I do?
Compare each item with your records Send an explanation and documents Amend only if you agree you left something out
How long does it take?
Respond by the date on the notice. If not resolved, a CP2000 may follow.
Sources
- IRS: Understanding your IRS notice or letter
- IRS: Get Transcript
- Taxpayer Advocate Service (independent help inside the IRS)
Written by the editorial team and checked against the official sources above. See our editorial policy.
By the TranscriptCodes Editorial Team · Last reviewed 2026-11-12.