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🧾 How to Fax a W-9 to a Client

📅 Updated October 2026 · 🌍 Send from any country

✦ Quick Answer

A Form W-9 goes to the person or company that asked for it, never to the IRS. The IRS instructions say to give the form to the requester and not to send it to the IRS, and requesters may set up a system to receive W-9s electronically, including by fax. Use the fax number your client gives you, select United States, type the 10 digits, and a cover page plus your signed W-9 costs $2.99.

Fax your W-9, $2.99

Who Gets the W-9

The W-9 is a form you give to someone who is going to pay you, so they have the details they need for their own tax reporting. The IRS instructions are short on this point: give the form to the requester, and do not send it to the IRS. The client, platform, bank or company that asked for it keeps it in its own files.

That means there is no IRS W-9 fax number, and there is nothing to file. Searching for a "W-9 fax number" will only ever give you the right answer if it comes from the requester. If the request came by email or through a vendor portal, the fax number, if they take fax at all, will be in that request or on their vendor setup form.

The rule: fax a W-9 only to the number your client gives you. Never fax it to an IRS number. IRS fax lines are tied to specific forms, and some, like the Form 3911 lines, say not to send anything else to them.

Which Fax Number to Use

The one your client gives you, in writing. The IRS instructions allow requesters to set up their own system for receiving W-9s electronically, and fax is one of the options they can choose. Whether they take fax, and at which number, is up to them.

A W-9 carries your taxpayer identification number, so treat a wrong number as a real risk. Before you send, check the fax number against the client's email, invoice, vendor form or website, and if anything looks off, ask accounts payable to confirm it. Do not use a number copied from an old email chain or from a different department.

Fax your W-9, $2.99

Entering the Client's Fax Number

For a client in the United States, select United States, then type the 10 digits with no leading 1, no spaces and no dashes. A number written (212) XXX-XXXX is entered as 212XXXXXXX. More detail is in how to fax to the USA online.

If the requester's office is in another country, select that country instead and enter the local number in its format; see how to send a fax to another country. From the US or anywhere else, use OverseasFax; see sending a fax from outside the United States.

What to Put on the Pages

A cover page keeps your W-9 from getting lost on a shared office fax. Put the client's company name and the department or person who asked for it, your name or business name exactly as you wrote it on the W-9, any vendor number, invoice number or reference they gave you, your email and phone, the words "Form W-9 attached", and the page count.

Do not write your taxpayer identification number on the cover page; it belongs only on the form. Then attach the completed, signed and dated W-9. If the client also asked for a vendor setup form or an invoice, add those after the W-9. Scan to PDF so the numbers are sharp, because a misread digit means the client has to come back to you.

Fax your W-9, $2.99

When to Send It

There is no IRS deadline for a W-9, because it never goes to the IRS. The deadline is whatever your client sets. Clients usually ask for a W-9 because a payment to you is coming, so if an invoice is waiting, send the W-9 the same day you are asked rather than letting it hold things up.

Cost and Your Record

A cover page plus a one-page signed W-9 is 2 pages, which costs $2.99. With a two-page vendor setup form and an invoice added, 5 pages comes to $2.99 + 2 x $0.99 = $4.97. You see the price before you pay.

There is no account, nothing is printed on your document, and if the fax cannot be delivered the full amount goes back to your card automatically. Delivery usually takes a few minutes. The confirmation email then shows the destination number, the page count and the time it went through, in US Eastern Time. Keep it; if the client says they never got your W-9, it is your record of exactly when it was sent and to which number.

If the client wants to fax back a signed contract or a payment form, our sister service GetAFax.com gives you a US fax number for 24 hours for $5, and anything received arrives in your email.

Fax your W-9, $2.99

Not a US Person? You May Need a W-8BEN

If you are not a US person, the client may ask you for a W-8BEN instead of a W-9. It follows the same pattern: it goes to the payer, not the IRS. See how to fax a W-8BEN to a bank or broker. For forms that really do go to the IRS by fax, start with how to fax the IRS.

Why send it here

One price for the whole fax, shown before you pay, and nothing added at checkout.

Nothing is printed on your document. It arrives exactly as you uploaded it.

If it cannot be delivered, the money goes back to your card without you asking.

It works from anywhere. Send from any country, in any browser, with no account.

Frequently Asked Questions

Cost and what you get

How much does it cost to fax a W-9?

$2.99 for up to 3 pages. A cover page plus a one-page signed W-9 is 2 pages, so it is $2.99; extra pages are $0.99 each. No account and no subscription.

Is there a cheaper way to fax a W-9 to a US client?

OverseasFax charges $2.99 for up to 3 pages and $0.99 for each extra page, from the US or any other country, with no account, no subscription and nothing added at checkout. Free fax services do exist, but they usually cap the number of pages and print their own advertising on the cover page, which you do not want on a tax form for a client.

Can I fax a W-9 for free?

Free fax services generally limit pages and add their own advertising to the cover page. A W-9 carries your tax ID number, so a clean fax to the right number with a dated confirmation email is worth $2.99.

Sending a fax

Where do I fax my W-9?

To the client or company that asked for it, at the fax number they give you. The IRS says to give the W-9 to the requester and not to send it to the IRS.

Do I send my W-9 to the IRS?

No. The IRS instructions say to give Form W-9 to the requester and not to send it to the IRS. The client keeps it in its own files.

What is the IRS fax number for a W-9?

There is none, because a W-9 never goes to the IRS. Do not fax a W-9 to any IRS number; send it to the requester at the fax number they give you.

Can a client accept a W-9 by fax?

Yes. The IRS instructions let requesters set up a system to receive W-9s electronically, including by fax. Whether a particular client takes fax is their choice, so ask them for their number.

My client in Texas needs my W-9 today and I'm in Manila, can I fax it?

Yes. OverseasFax works in any browser in any country and takes international cards. Select United States, enter the client's 10-digit fax number, upload your signed W-9 as a PDF, and delivery usually takes a few minutes.

Do I need to sign the W-9 before I fax it?

Yes, sign and date it before you scan it. A faxed copy shows your signature as you signed it, and nothing is printed on your document by us.

Is there a deadline to fax a W-9?

Only the one your client sets. There is no IRS deadline because the form does not go to the IRS. Clients usually ask for it because a payment is coming, so send it the day you are asked.

Fax numbers and format

How do I enter my client's fax number to send a W-9?

Select United States and type the 10 digits with no leading 1, no spaces and no dashes. A number written (212) XXX-XXXX is entered as 212XXXXXXX.

My client's fax number is outside the US, can I still fax my W-9?

Yes. Select the country the client's office is in and enter the number in that country's local format. The price depends on that country, and you see it before you pay.

Receiving a reply

Can my client fax me something back after I send my W-9?

Not to OverseasFax, which only sends. If the client wants to fax you a contract or form, our sister service GetAFax.com gives you a US fax number for 24 hours for $5, with anything received sent to your email.

Delivery, proof and safety

Is it safe to fax a W-9 with my Social Security number on it?

Yes, if the number is right. The fax goes straight to the number you enter, there is no account, and nothing is printed on your document. Confirm the fax number with the client before you pay, and keep your tax ID off the cover page.

How do I show my client I sent the W-9?

Forward them the confirmation email. It shows the destination number, the page count and the exact time it went through, in US Eastern Time, which is your record of exactly when it was sent.

Why did my W-9 fax fail?

Usually a leading 1 was typed, the line was busy, or the number was a phone line rather than a fax. If it fails you are refunded automatically and can send again once you have checked the number.

I faxed my W-9 to an IRS number by mistake, what now?

Send it again to your client, at the number they gave you, because the client is the one who needs it. Use only the requester's number from now on.

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