Individual tax
Got an IRS Notice? What to Do Next (CP2000 and Other Letters)
By the Elite B Tax Services team 5 min readUpdated October 7, 2026
The short answer
Read the whole notice, check that it is genuine, and act by the date it gives. If you agree, do what it asks — you usually don't need to reply unless the notice says so. If you disagree, reply with your explanation and documents before the due date. A CP2000 is not a bill: it proposes changes because third-party information didn't match your return.
First, make sure it's real
The IRS starts contact by mail. Search for the notice number on IRS.gov. If it doesn't show up or looks suspicious, call the IRS at 800-829-1040 — not a number printed on the letter.
The IRS does not start contact by text message, email or social media to ask for payment or personal information.
Common notices and what they mean
| Notice | What it usually means | What to do |
|---|---|---|
| CP2000 | Income or payments reported by employers or banks don't match your return; the IRS proposes changes | Reply by the date, agreeing or disagreeing with documents |
| Balance-due notice | The IRS says you owe tax, penalties or interest | Pay by the due date if you agree, or contact the IRS if you don't |
| Identity verification letter | The IRS needs to confirm a return was filed by you | Follow the instructions before the return can be processed |
If you agree
Take the action requested. If you owe and can't pay in full, still pay what you can by the due date to reduce interest and penalties, and ask about a payment plan.
If you disagree
- Read exactly which item the IRS changed.
- Gather proof: corrected forms, cost basis for sold shares, foreign tax paid, proof of residency status.
- Reply by the date on the notice, using the response form if one is included.
- Upload, fax or mail the reply as the notice instructs, and keep copies.
Sources: IRS — Understanding your IRS notice or letter · IRS — Understanding your CP2000 notice
This guide is general information, not tax or legal advice for your situation. Rules and inflation-adjusted amounts change — contact us before you file. Read our disclaimer and editorial policy.