An IRS Notice CP2000, often called an “Underreporter inquiry,” is a letter sent by the IRS when the income, deductions, or credits reported on your tax return don’t match the information they’ve received from third parties like employers, banks, or crypto exchanges.
The IRS CP2000 notice is generated when the IRS’s Automated Underreporter (AUR) system finds differences between your filed tax return and information reported by third parties (like W-2s, 1099s, or brokerage forms).
Here’s what makes it unique:
Not a tax bill — it’s a proposed adjustment.
Not an audit — no IRS agent is digging into your records.
Action required — you must respond, either agreeing or disputing.
There are plenty of reasons the IRS might send this letter. The most common include:
Missed W-2 or 1099 income. Freelancers and side hustlers often forget a small 1099-NEC.
Stock sales. Brokerages may report gross sales without showing what you paid (cost basis). To the IRS, it looks like 100% profit.
Bank interest and dividends. Even a small 1099-INT you forgot can trigger a notice.
Number mismatches. Your employer reports $62,000 in wages, but you typed $26,000 by mistake.
How to Respond to a CP2000 IRS Notice
Step 1: Review the Notice
Pull your tax return and compare it with the IRS’s numbers. Then check your W-2s, 1099s, and brokerage statements. Many times, the discrepancy comes from a third-party reporting mistake.
Step 2 – Decide Whether You Agree or Disagree
If you agree:
Please sign the response form that is included with the notice.
Send payment in full (if you owe).
Keep a copy for your records.
If you disagree:
Gather proof (e.g., corrected 1099, cost-basis statements, pay stubs).
Write a clear explanation and attach supporting documents.
Mail everything back by the deadline.
Step 3 – Respond by the Deadline
Most CP2000 notices give you 30 days. If you need more time, you can request an extension, but don’t let the date pass without Action.
Step 4: Follow Up
After sending your response, allow 8–12 weeks for the IRS to process it. Check the status by:
Call the IRS number on the notice.
Checking your IRS account online at IRS.gov.
Review your tax transcript for updates.
If the IRS accepts your explanation, you’ll receive a confirmation letter. If they reject it, you may receive a CP3219A (Statutory Notice of Deficiency), giving you 90 days to appeal in Tax Court.
Step 5 – Pay or Arrange Payment
If you owe, paying quickly reduces interest and penalties. Can’t afford the full amount? You may qualify for:
An installment agreement (monthly payments).
An Offer in Compromise (settling for less than owed if hardship applies).
Penalty abatement (removal of penalties under certain conditions).
