IRS forms you can’t fax (and what to do instead)

What to do instead

• Form 1040-X (amended return): e-file it with tax software, or mail it to the address in the instructions (or on your notice).
• Form 9465 (installment agreement): apply online at IRS.gov/OPA, or attach it to your return or mail it to the address in the instructions.
• Form 8822 (change of address) and 8822-B (business address or responsible party): mail to the address on the form for your old address.
• Form 8832 (entity classification): mail to the service center in the instructions. (Form 2553, the S corp election, can be faxed.)
• Form W-7 (ITIN): mail with your original or certified documents, or go through an IRS office or Acceptance Agent.
• Form 4506 (copy of a return, paid): mail with payment. For a free transcript, Form 4506-T can be faxed.
• Form 843 (refund or abatement): mail to the address in the instructions, or to the address on your notice.
• Letter 147C (EIN verification): there’s no form to fax. Call the Business and Specialty Tax Line, 800-829-4933, and ask for it.

How to fax it

1. Check the form’s instructions on irs.gov for “fax”. If there’s no fax number, mail it or use the online option.
2. Replying to a notice? Use the fax number printed on the notice if it has one.
3. For forms that do take faxes, send them from dimefax.com/send.

Dimefax costs 10¢ a page and you’re only charged if the fax goes through. On the web, page credits come in packs of 50 for $4.99, 100 for $9.99 or 200 for $19.99; the Dimefax iPhone app also sells 10 for $0.99. Credits you don’t use stay in your account and last as long as you fax once a year.

Where these numbers come from

• IRS: Instructions for Form 1040-X
• IRS: Instructions for Form 9465
• IRS: Form 8822
• IRS: Form 8822-B
• IRS: Form 8832
• IRS: Instructions for Form W-7
• IRS: Form 4506
• IRS: Instructions for Form 843
• IRS: Employer identification number (Letter 147C)

Dimefax isn’t part of, or endorsed by, the IRS. We copied these numbers from irs.gov on November 11, 2026. Agencies change their numbers: if your letter, notice or form gives a different one, use that.