Guides

How to fax the IRS

Updated November 3, 2026

Only fax the IRS at a number given in your notice, on the form’s instructions or by an IRS agent: the numbers depend on the form and the office. Include a copy of the notice if you’re replying to one, send it from sendfaxwell.com/send, and keep the delivered confirmation.

Steps

  1. Find the fax number in your IRS notice or letter, the form’s instructions, or from the agent you spoke to. Don’t use a number from a random website: the IRS uses different numbers for different forms and offices.
  2. Check the form can be faxed. The IRS accepts faxes only for some forms and replies; the instructions say so when it does.
  3. Put it together: a cover page with your name, the form or notice number, and the page count, then the form or your reply, then a copy of the notice if you’re replying to one.
  4. Send it from sendfaxwell.com/send.
  5. Keep the confirmation. Faxwell shows the time it was delivered. Note it with your tax records.

Tips

On the web, page credits come in packs of 50 for $3.99 or 200 for $11.99, about 6 to 8¢ a page. Each card payment has a fixed fee, so the smallest web pack is 50 page credits; the Faxwell iPhone app (coming soon) will sell 10 for $0.99. Credits you don’t use stay in your account and last as long as you fax once a year.

Questions

Does the IRS accept faxes?

For some forms and replies, yes. The fax number and whether faxing is allowed are in your notice or in the form’s instructions.

What is the IRS fax number?

It depends on the form and the office. Use the number in your notice, the form instructions, or the one an IRS agent gives you.

How do I prove I faxed something to the IRS?

Keep the delivery confirmation with the date and time. Faxwell shows “Delivered” with the time once the IRS machine confirms the pages.