How do I send a fax?
Five steps, no machine required.

To send a fax you need the recipient’s fax number and your document as a file. Open an online fax service in a browser, upload the document, type the number with its area code and press send. The service places the call to the receiving fax machine for you and emails back a confirmation. No fax machine, no phone line and no software. A single fax costs $2.99 on usfax.com; there is a 7-day free trial on the monthly plans.

What do I need before I start?

Three things, and only three:

• The recipient’s fax number. It is printed on whatever asked you to fax. Agencies frequently publish a different number per form — the IRS lists 855-641-6935 for Form SS-4 from the 50 states and DC, but 855-214-7523 for Form 8655 — so use the one on your document.
• The document as a file. A PDF is ideal. Paper can be photographed with your phone’s built-in scan function.
• A way to place the call. That is the part people no longer have, and it is what an online fax service supplies.

You do not need a fax number of your own to send. A number is for receiving. If the agency will fax something back to you, read what a fax number is first and get one before you send.

How to send a fax, step by step

1. Get the recipient's fax number. Find the fax number on the form, letter or web page you are responding to. It looks like an ordinary US phone number and is usually labelled “Fax”. Agencies often publish a different fax number per form or per region, so use the one printed on your document rather than a general office number.
2. Get your document into a single file. A PDF is best. If the document is on paper, photograph each page with your phone's scan feature or a scanner app and save it as one PDF. Keep it black and white and upright; a fax is a one-bit image, so a shadowed phone photo becomes an unreadable page at the other end.
3. Add a cover sheet if one is asked for. Some processes require one, and a few require a specific one — Oregon's Medicaid provider enrollment, for example, insists on an EDMS coversheet with the Provider Enrollment box ticked. Otherwise a cover sheet carries your name, your callback number, the recipient, the subject and the page count.
4. Send it. With an online fax service, open the send page in your browser, upload the file, type the recipient's fax number with the area code, and press send. There is no dial tone, no phone line and no machine. With a physical machine, load the pages face down, dial the number, and wait for the handshake tone.
5. Keep the confirmation. A fax transmission ends with a result: delivered, busy, or failed. Save the confirmation — it records the destination number, the time and the page count, and it is the reason agencies still accept fax. If it failed, resend; a busy or no-answer result usually means the far end was mid-fax, not that your document was rejected.

Which way should I send it?

There are three routes, and for someone with no equipment only one of them is realistic.

The third route deserves a warning: you are handing a stranger a document that usually contains an EIN, a signature or patient information, and you get whatever receipt they choose to give you. The full comparison is on do I need a fax machine?

Do I need a cover sheet?

Often, and sometimes a specific one. A cover sheet exists because a fax arrives on a shared machine with no envelope: it tells whoever picks the pages up who the fax is for, who sent it, how many pages there should be and what to do if a page is missing. Some processes make it mandatory — the Oregon Health Authority will only accept a faxed provider-enrollment application “under an EDMS coversheet with the ‘Provider Enrollment’ box marked at the top.” If the instructions name a cover sheet, use theirs. Otherwise a plain page with your name, your callback number, the recipient, the subject and the page count is enough.

How do I make sure it is readable at the other end?

A fax is a one-bit image: every pixel is black or white, with no grey in between. That single fact explains almost every complaint about faxes being illegible.

• Scan or photograph in good, even light, straight on, with the page filling the frame.
• Prefer a real PDF over a photo whenever the document exists digitally.
• Avoid highlighter, coloured backgrounds and light grey form shading — they turn into solid black or vanish.
• Sign in black or dark blue ink, pressed firmly.
• Check the page count before sending; a missing page is the most common reason a filing is rejected.

How long does it take, and how do I know it worked?

Budget about a minute a page once the call connects. Busy signals are normal — a fax machine can only take one call at a time, and a busy agency number may need several attempts, which a fax service retries automatically. What you keep afterwards is the confirmation: destination number, timestamp, page count and result. That record is the reason fax survives in regulated processes at all, and it is worth filing with the document.

Do not assume silence means success. The Oregon Health Authority explicitly tells new providers to contact Provider Enrollment at least 48 hours after faxing to confirm receipt. Where a deadline is involved, follow up.

Why is anyone still asking me to fax in 2026?

Because for a number of federal and state processes it is still a published channel, and sometimes the quickest one. IRS Form 8655 can be filed by fax (855-214-7523) or by mail and nothing else. The IRS instructions for Form SS-4 say Fax-TIN runs 24 hours a day and returns an EIN by fax generally within four business days, against roughly four weeks by mail. Texas Medicaid publishes a provider-enrollment fax at 512-514-4214, and CMS’s Level-2 Medicare appeals contractor takes appeals at 904-539-4081. In almost every case there is also an online or postal option — fax is the expedite path, not the only path.