Faxing a response to an IRS notice (CP2000, audits)

There is no single IRS fax number for CP2000 responses or audit correspondence. When a notice permits fax, the correct number is printed on the notice itself — usually on the first page or the response form — and it differs by campus, office and even examiner.

Always respond to that exact number by the response date on the notice, include the notice's contact stub or reference number on every page, and keep the transmission log. If your notice lists only a mailing address, fax is not an option for that notice.

Deadline

The response date printed on your notice — typically 30 days for a CP2000.

Frequently asked questions

There isn't a universal one. The fax number for your CP2000 is printed on the notice itself; responses sent anywhere else may never reach your case file.

Yes, when the examiner requests or permits it — use the fax number the examiner or the information document request (IDR) provides.

The response page or contact stub from the notice, the notice number and tax year on every page, your explanation and supporting documents — and keep the fax confirmation with your records.

Yes: if you received an IRS notice about suspected identity theft, respond to the number/address on that notice rather than the general 855-807-5720 line.
Notice-response fax numbers are unique to the office and notice that contacted you — there is no universal number we could route to, so use the one printed on your letter. The forms below fax today: 5472+1120, SS-4, 2553.