How to fax a document to the IRS

The IRS accepts faxes for some forms and for replies to certain notices. You don't need a fax machine: send it from your phone or computer with FastFax.

FastFax lets you send a fax online from your phone or computer for as little as 2¢ a page, with no subscription. US fax numbers only, up to 100 pages per fax.

When the IRS takes faxes

The IRS lists a fax number on many letters and notices when they want a reply with documents, and some forms (for example certain authorization and EIN-related forms) have fax numbers in their instructions. Tax returns themselves are generally filed electronically or by mail, not fax. Check your notice or the form's instructions on irs.gov for the right number.

Always use the fax number printed on your letter, notice or form, or on the office's official website. Fax numbers change and often differ by department.

How to fax the IRS with FastFax

1. Scan or upload your pages on fastfax.app: the response page from the notice, your letter, and supporting documents.
2. Turn on a cover page. Put the notice number (like CP2000) and your name in the subject, and the department from the notice in Attn.
3. Type the fax number from your notice and check the preview.
4. Send, then download the Fax Transmission Confirmation PDF and keep it with your tax records.

Tips

• Put your name and the last four digits of your SSN or EIN on each page, as IRS notices usually ask.
• Include a copy of the notice's first page so it's matched to your file.
• IRS fax lines can be busy. If the fax fails, the page credits come back to your wallet and you can resend.

Questions