Can I fax a W-9 to a company?

Yes. The IRS explicitly allows requesters to accept Form W-9 electronically, including by fax. Most companies that ask for a W-9 will accept a faxed copy. Confirm the fax number with the requester before sending.

Is it safe to fax a W-9?

Faxing is one of the safest ways to send a W-9 because the document travels point-to-point and isn't stored on an email server. Online fax services like [mFax.to](https://mfax.to) add TLS encryption for extra protection. See our guide on [online fax security](/blog/is-online-fax-secure/) for details.

Do I send a W-9 to the IRS?

No. A W-9 is never mailed or faxed to the IRS. You send it directly to the person or company that requested it — typically an employer, client, bank, or financial institution. They use your W-9 information to file their own IRS reports.

Can I fill out and send a W-9 online?

Yes. Download the fillable PDF from [IRS.gov](https://www.irs.gov/forms-pubs/about-form-w-9), complete it on your computer, then fax it using an online service like [mFax.to](https://mfax.to). No printing or scanning required.

How to Fax a W-9: When, Where & How to Send It Securely

Learn how to fax a W-9 form securely from your phone, computer, or fax machine. Includes step-by-step instructions, safety tips, and common mistakes to avoid when sending this sensitive tax document.

Frequently Asked Questions

Can I fax a W-9 to a company?: Yes. The IRS explicitly allows requesters to accept Form W-9 electronically, including by fax. Most companies that ask for a W-9 will accept a faxed copy. Confirm the fax number with the requester before sending.
Is it safe to fax a W-9?: Faxing is one of the safest ways to send a W-9 because the document travels point-to-point and isn't stored on an email server. Online fax services like [mFax.to](https://mfax.to) add TLS encryption for extra protection. See our guide on [online fax security](/blog/is-online-fax-secure/) for details.
Do I send a W-9 to the IRS?: No. A W-9 is never mailed or faxed to the IRS. You send it directly to the person or company that requested it — typically an employer, client, bank, or financial institution. They use your W-9 information to file their own IRS reports.
Can I fill out and send a W-9 online?: Yes. Download the fillable PDF from [IRS.gov](https://www.irs.gov/forms-pubs/about-form-w-9), complete it on your computer, then fax it using an online service like [mFax.to](https://mfax.to). No printing or scanning required.