How to Fax a W-9, 1099, or 4506-T from Your iPhone
Self-employed, freelancing, or applying for a loan? Here's exactly how to fax the three most common tax forms from your iPhone — no machine, no subscription.
If you are self-employed, a freelancer, a contractor, or you run a small business, tax season usually means dealing with one of a few specific forms — and sometimes faxing them. The W-9, the 1099, and the 4506-T are three of the most commonly faxed tax forms, and you can send all of them from your iPhone without a fax machine.
Faxing a W-9
The W-9 is the form a business asks you to fill out so they can report payments they made to you. Clients, platforms, and companies request it constantly, and they often want it sent quickly so they can process your payment.
To fax a W-9 from your iPhone, fill out and sign the form (you can sign it digitally or sign a printed copy and photograph it), open a fax app, enter the recipient's fax number, attach the W-9, and send.
Why fax a W-9 instead of emailing it?
A W-9 contains your Social Security number or EIN. Faxing is often preferred over email because it is considered a more secure transmission method than sending sensitive tax data through regular email — which can be intercepted, forwarded, or stored in inboxes indefinitely.
Faxing a 1099
If you issue 1099 forms to contractors, or you need to send a corrected 1099, fax is sometimes the requested method. The process is the same: prepare the form, confirm the recipient's fax number, attach, and send from your phone.
Keep the confirmation, especially for corrected forms, so you have a record of when you sent it and can prove timely submission if a dispute arises.
Faxing a 4506-T
The 4506-T is a request for a tax transcript, often needed for mortgage applications, loans, or income verification. It frequently needs to be faxed to the IRS, and the IRS lists specific fax numbers for it depending on your state and situation.
Download Form 4506-T from IRS.gov. Fill in your name, SSN, the tax year(s) you need, and the transcript type. Sign the form — a wet or digital signature is acceptable.
The correct fax number varies by state and situation. Check the official form instructions at IRS.gov — the number is listed there, broken down by region. Do not use a number from an unofficial source.
Open SupaFAX, scan the signed form or import the PDF, enter the verified IRS fax number, and send. Processing typically takes 5–10 business days once the IRS receives it.
The delivery confirmation with its timestamp is your proof that you submitted on time. Save it — especially if the 4506-T is tied to a loan or mortgage application with a deadline.
Why fax these forms instead of email?
Two reasons. First, security: these forms contain sensitive information like SSNs and EINs, and fax is treated as a more secure transmission method than standard email. Second, requirement: many institutions, lenders, and the IRS specifically ask for fax, so you may not have a choice.
Quick checklist before you send
Faxing these forms with SupaFAX
SupaFAX lets you fax any of these forms from your iPhone in a couple of minutes. Scan the signed form with the in-app scanner or upload a PDF, enter the recipient's fax number, and send for $1.99 per fax — no subscription. Documents are encrypted, which matters when you are sending forms with your SSN or EIN on them.
The pay-per-fax model fits the occasional nature of tax paperwork well. You are not paying a monthly fee for something you use a few times a year.
For more context on faxing the IRS, see our complete IRS fax guide or the IRS fax numbers reference page.
Ready to send a fax from your phone?
Download SupaFAX — available on iOS and Android. Send your first fax for $1.99. No subscription, no account required.