Is a fax confirmation proof your fax was received?

A fax confirmation is proof that you sent the fax, and an OK result means the transmission to the number you dialed went through. It can't show that anyone at the office found or logged the pages, so for anything with a deadline, call to check that they have it.

What a fax confirmation shows

On a fax machine, the confirmation is the transmission report. Brother's report for the MFC-L2750DW lists the receiving party's name or fax number, the date and time, how long the fax took and the number of pages sent. OK next to RESULT means the fax went through, and NG means it didn't.

Before you file the report away, check the fax number on it against your letter or form. Then check that the page count matches what you meant to send. If the result is NG or the count is short, send the fax again. We explain what the common error messages mean in our guide on why a fax isn't going through.

Some machines print the report only when a fax fails. On the MFC-L2750DW, that's the factory setting. Its On (+Image) setting prints a report after every fax with part of the first page on it, so you can match the report to the document. You'll find it under Settings > All Settings > Fax > Report Setting > Transmission. Canon's MF729Cdw has a similar setting called Include TX Image.

If you faxed from a website, an app or a store, keep the result email, the status screen or the printed confirmation, and check it the same way.

Why a confirmed fax can still go missing

An OK result means the transmission went through. What happens to the pages next is up to the office, and a confirmed fax can get stuck in several places.

• The number was old or wrong. A form or letter can carry a fax number the office no longer checks, and one wrong digit can reach someone else's fax machine.
• It printed on a shared machine, or arrived in a shared fax inbox, and nobody passed it on.
• The office forwarded it to another department or another location.
• It was filed under a different name or case number, so a search for yours doesn't find it.
• Only some pages went. If the page count on your report is lower than what you meant to send, that's the likely reason.

Apart from a short page count, none of these show on your report, so we'd call the office before sending the same fax to the same number again.

What to do when they say they never got it

1. Check your report. Make sure the number is the one the office gave you, the page count matches what you meant to send and the result is OK.
2. Call the office. Ask whether that number is the right one for your document and where faxes to it go. Give them the date and time on your report and the number of pages, and ask them to look again.
3. Write down the name of the person you spoke to, the date and any reference number they give you.
4. If they still can't find it, send it again to the number they confirm on the call. Add a cover sheet with that person's name, your claim or case number, the page count and a line such as "Sent again. First sent November 3 at 10:14 a.m." You can make one with our free fax cover sheet maker.
5. Ask how they'll confirm it arrived this time, such as a reference number, an email or a call back.
6. If a deadline is close, send it a second way the same day as well. Upload it if the office has an online portal, or mail it with tracking. Keep the upload confirmation or the mailing receipt with your fax report.

To send it again today, use this website. Upload a PDF or photos and type the fax number, with no account. As of November 2026, a fax of up to 40 pages to a number in the US or Canada costs $2.49. We only charge your card when the fax is delivered. If the fax fails, we cancel the payment and you aren't charged.

Send a fax online

When a fax counts for a deadline

The IRS, as the Taxpayer Advocate Service describes it, and Tennessee's civil trial courts both go by when your fax reached them, and they differ in the details. Other offices set their own rules.

From the IRS, Taxpayer Advocate Service and Tennessee Courts pages, read November 4, 2026.

The Taxpayer Advocate Service described the IRS's position in a 2018 blog post, updated in 2023. From its talks with IRS lawyers, it understands that the IRS looks only at the date it receives a faxed or other electronic document. The lawyers' reason is that people can change the dates on fax machines and computers.

Mail is treated differently. In the blog's example, a payment mailed to the IRS before midnight on the due date counts as on time. The IRS may not receive and process it for about a week. Registered or certified mail counts as evidence that it was delivered. For an IRS deadline, we wouldn't leave the fax to the last day.

Tennessee's rule puts the risk on the sender, including a broken machine at either end, a power outage, a misdialed number or a busy signal. If a fax to the clerk fails, the sender can file by mail or in person instead, and the filing date then follows the rules for those. If a fax doesn't arrive in full because of a transmission error, the sender can ask the court in writing to file the original as of that earlier time. The request goes with the transmission record, the original document and a sworn statement, and the court decides. So in that court, your report is part of the evidence.

Other courts, agencies and insurers set their own rules. If a missed date could cost you a case, a claim or benefits, read the instructions on the letter or form. If they're unclear, ask the office which date it goes by. IRS fax numbers by form are in our guide to finding the right IRS fax number.

Keep a record that matches what you sent

Keep the confirmation together with a copy of the exact pages you sent and your notes from any call. If the office later says the fax never came, you have the number, the time, the page count and the pages themselves in one place.

On faxfair.com, a private status page shows your fax's progress until it's delivered or fails. When it says delivered, take a screenshot and keep it with the receipt Stripe emails you. It shows our delivery status, not a receipt from the office.

The pages carry their own times too. The fax service prints the date and time at the top of each page. At the bottom, we print your name, your phone number and the date and time sent. Give the office that date and time when you ask them to look for it.

Before you pay, the preview shows every page, cover sheet included, as we'll send it. We delete your files from our servers once the fax is delivered or fails, so keep your own copy of what you uploaded.

Questions