How to Fax a CP2000 Response to the IRS

Updated October 2026

You got a CP2000 notice and need your response in by the date printed on it. Fax it to the number that matches the IRS location on the top left of your notice; there are seven, listed below, and it costs $1.00 here for up to 10 pages.

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CP2000 Fax Numbers by Notice Location

The IRS says to "fax your response to the location listed on the top left side of the notice." These are the seven numbers from the IRS page Understanding Your CP2000 Notice.

How to Pick the Right Number

Go by the notice, not by where you live. The IRS ties the fax number to the location printed on the notice, so look at the top left of page 1, find the city, and match it to the table.

Type the 10 digits with no leading 1. We already add the +1. If your notice shows a location that is not one of these seven, do not guess: use the mailing address on page 1 of your notice or the IRS online upload tool instead.

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What to Put on the Cover Page and Each Page

Start with a cover page that says "Response to CP2000", your name, the last four digits of your Social Security number, the tax year, the notice date, how many pages follow, and a daytime phone number. Say in one line whether you agree, partly agree, or disagree with the proposed changes.

Behind it, put the response pages from your notice, then a short written explanation, then the documents that back it up, such as a corrected 1099, a brokerage statement showing cost basis, or proof that income was already reported on your return. Put your name, the last four digits of your SSN, the tax year and "CP2000" in the top margin of every page so loose pages can be matched to your case.

Scan in black and white at a readable size. Small print on brokerage statements is the part most likely to blur, so check it on screen before you send.

What It Costs

Most CP2000 responses are the response pages plus a letter and a few documents, which fits in 10 pages for $1.00. Brokerage statements can push it to 11 to 25 pages, which is $1.99, or 26 to 50 pages for $2.99. If you have more than 50 pages, send two faxes and mark them "part 1 of 2" and "part 2 of 2" on the cover pages.

There is no account and no subscription. The price is shown before you pay.

Send a fax now, $1.00

Mail and the Online Upload Tool

Fax is one of three ways to respond. You can also mail your response to the address on page 1 of the notice, or use the IRS online upload tool, which the IRS calls the fastest way. Fax makes sense when you have the pages on paper or in a PDF, want a confirmation in minutes, and do not want to stand in line at the post office close to your date.

If a tax professional is handling the notice for you, our Form 2848 and 8821 guide covers the authorization the IRS needs before it will talk to them. If you have tried to resolve it and are stuck, the Form 911 guide explains how to ask the Taxpayer Advocate Service for help.

Deadline and Your Record

Reply by the date listed on your notice. That date is the one that counts, not a rule of thumb you read somewhere. Send a few days early so a busy line does not catch you on the last day.

Your fax is usually delivered within a few minutes. You get a confirmation email with the destination number, the page count and the time, in Eastern Time. That is your record of exactly when it was sent; keep it with your copy of the response. If the fax cannot be delivered, your money goes back to your card automatically and you can resend. For other IRS offices and what they accept, see How to Fax Documents to the IRS.

If an IRS employee offers to fax you a document and you have no fax machine, our sister service GetAFax.com gives you a US fax number for 24 hours for $5, with up to 30 pages arriving in your email.

Frequently Asked Questions