There is no single IRS fax number — and any website that lists just one is not helping you. The IRS uses different fax numbers for different forms, notices, and programs. This page explains how to find the correct number for your situation, straight from the IRS, and then send it online.
If the IRS sent you a notice or letter asking for documents, the fax number to respond to is usually printed right on it. Use that number exactly as shown — it routes your response to the team handling your case.
No notice? Look up your form or program on IRS.gov and read its instructions or “where to file” information — some programs publish a fax number there. If the IRS gives no fax option for your item, mail or e-file it instead.
Once you have the verified number, attach your documents here, enter the IRS fax number, and send. Your delivery confirmation is emailed to you — keep it with your tax records.
Follow the instructions that came with your notice or form. Responses are often asked to include your name and taxpayer identification number so the IRS can match the pages to your account — write on each page what the instructions ask for. Include any response form or cover notice the IRS provided, so your fax lands in the right file.
Double-check the number digit by digit before you send, and send early if you’re answering to a deadline — meeting an IRS deadline is your responsibility, and faxing at the last minute leaves no room for a busy line. Your emailed delivery confirmation shows your reference number, the destination, and the final delivery status — your record of what was sent, and where.
Cost: faxing a US number with FaxNowFree is free for the first 5 document pages, and the cover page never counts toward your pages. Longer responses use flat tiers shown before you send (6–15 pages is $2.99 to US numbers). No account or card is needed for a free fax.
Why we don’t list IRS fax numbers: they differ by form, notice, and program, and they can change. Sending personal tax documents to a wrong or outdated number is a real risk. Always take the number from your IRS notice or from IRS.gov — never from a third-party list.
Open the sender tool, attach your documents, and send them to the number on your notice.
Send a fax nowFirst 5 pages to the US & Canada are free — no account, no card.
There isn’t one. The IRS publishes different fax numbers for different forms, notices, and programs. Use the number printed on your IRS notice, or the one shown on IRS.gov in the instructions for your specific form or program. Be wary of third-party sites listing IRS fax numbers — they may be wrong or outdated.
Usually not. Tax returns are generally e-filed or mailed unless the instructions for your specific situation say otherwise. Faxing is typically for responding to an IRS notice or a program request that provides a fax number. Always follow the instructions on your notice or form.
Whatever your notice or form instructions ask for — commonly your name and taxpayer identification number on your pages so the IRS can match them to your account, plus any response form the IRS included. Then keep your emailed delivery confirmation as your record.
With FaxNowFree, a fax of 1–5 pages to a US number costs $0, with no account or card. Longer documents move into flat tiers (6–15 pages is $2.99), and the exact price is shown before you send.