To fax the IRS from your phone, scan or upload the signed form, send it to the fax number for your form and state (listed below from irs.gov), and keep the transmission report as proof. For Forms 2848 and 8821, the IRS requires a handwritten signature on a faxed form.
Several IRS units accept forms by fax, which means a phone can do the whole job: scan the signed form, dial the right unit, keep the proof. Two details decide whether the fax counts: the number has to match your state, and the signature has to be one the IRS accepts on a fax.
IRS fax numbers by form
Read on irs.gov on November 12, 2026. Where the number depends on where you live, it is split by IRS office; the state lists are in the fax numbers directory and in each form's instructions.
| Form | What it is | Fax number | Notes |
|---|---|---|---|
| 2848 | Power of attorney | 855-214-7519 (Memphis) or 855-214-7522 (Ogden) | By state. Outside the 50 states: 855-772-3156 |
| 8821 | Tax information authorization | 855-214-7519 (Memphis) or 855-214-7522 (Ogden) | Same split as 2848 |
| SS-4 | EIN application | 855-641-6935 | Business in the 50 states or DC. Otherwise 855-215-1627 |
| 4506-T | Transcript request | 855-587-9604, 855-821-0094 or 855-298-1145 | By the state on the return |
| 2553 | S corporation election | 855-887-7734 (Kansas City) or 855-214-7520 (Ogden) | By the corporation's state |
| 8857 | Innocent spouse relief | 855-233-8558 | Don't attach it to your return |
| 14039 | Identity theft affidavit | 855-807-5720 | Answering a letter? Use its number |
| 15227 | Identity Protection PIN request | 855-807-5720 | Fax or mail, not both |
| 911 | Taxpayer Advocate request | 855-828-2723 | Main office number |
Each number in the directory has a "Fax to this number" button that opens faxup.net/send with the number filled in.
The signature rule that trips up phone users
Signing on the screen is the obvious shortcut on a phone, and for Forms 2848 and 8821 the IRS doesn't accept it by fax. Both sets of instructions say you must handwrite your signature if you file by mail or fax, and that digital, electronic or typed-font signatures are only valid when the form is submitted online.
So for these two forms:
- Print the form, or ask the representative to send you a printed copy.
- Sign it with a pen. Dark ink scans best.
- Scan the signed pages with the FaxUp app's scanner, or with the free phone document scanner in your browser.
- Fax the scan.
Don't add the signature with Fill & Sign for these forms. Use Fill & Sign for typing your details if you like, but the signature itself has to be ink on paper. For other forms, read the signature section of the instructions: the rules aren't the same for every form.
Make the pages readable
An IRS fax prints in black and white, like any other fax. Faint pencil, a light blue pen or a photo taken in a dim room can come through as blank boxes, and a form the IRS can't read is a form it can't process.
- Lay the form flat under even light and keep all four edges inside the frame.
- Keep every page the right way up and in order. The organize PDF tool fixes order and rotation without uploading anything.
- Run the file through the fax preview to see the black-and-white result before you pay.
A cover sheet
Form 15227 asks for a cover sheet marked "Confidential". For any IRS fax, a cover sheet with your name, the form number, the tax year and the page count helps the unit match the pages to your file. The free cover sheet maker puts it in front of your document as one PDF, or you can add one in the send flow.
Keep proof
If you turned on email notifications in the FaxUp app, a delivered fax brings an email with a one-page transmission report attached as a PDF. It lists the number dialled, the page count, the time (UTC) and a transmission reference. If the IRS later says it never received the form, that report is your evidence that it went through. Save it with a copy of what you sent. More on reading it in fax confirmation reports.
Sending it
- Open faxup.net/send or the FaxUp app and add the scanned form.
- Enter the IRS number for your form and state, with the country set to United States (+1).
- Check the preview, add the cover sheet, and send.
- Wait for "Delivered". If the line is busy or the call fails, FaxUp retries on its own, and a fax that never gets through gives its credit back.