How to Fax the IRS
Which forms the IRS accepts by fax, all fax numbers organized by form, step-by-step sending instructions, and mistakes to avoid.
The IRS still relies heavily on fax. Dozens of forms have dedicated fax lines — in many cases, faxing is faster than mailing and produces a delivery confirmation that mail does not. In some cases, like Form 8806, fax is the only submission method the IRS accepts.
This guide covers every IRS form that can be faxed, the correct fax number for each, how long processing takes, and how to avoid the most common mistakes that cause submissions to be rejected or lost.
IRS Forms You Can Fax
These forms have official IRS fax numbers. Click any form for detailed instructions and state-specific fax numbers.
Forms the IRS Does Not Accept by Fax
These are the most common forms people try to fax — and the IRS will not process them. If you’re looking to fax a personal tax return, the short answer is: you can’t. See individual form guides for your submission options.
Not sure which forms you can fax? See our guide: Can I fax my tax return to the IRS?
How to Fax a Form to the IRS
Follow these steps exactly to avoid the most common rejection reasons.
Confirm you have the right form and the right version
The IRS publishes form updates annually. Using an outdated version of a form (especially Form 2848, 8821, or 2553) is one of the most common reasons for rejection. Download the current version from irs.gov before faxing.
Look up the correct IRS fax number for your state
Many IRS forms have different fax numbers depending on your state. Form SS-4, 2553, 2848, 8821, and 4506-T all have regional numbers. Using the wrong number sends your form to the wrong processing center — the IRS will not forward it. Use the form-specific guides above or the complete directory at /fax/irs-fax-numbers.
Complete every required field, especially signatures
Missing signatures are the top rejection reason for Forms 2848 and 8821. Missing CAF numbers, incomplete addresses, and undated signatures are also common triggers. Review the IRS instructions for your specific form before faxing.
Convert to PDF and set resolution to 300 DPI
Fax the document as a clean PDF at 300 DPI or higher. Low-resolution faxes may render taxpayer identification numbers, dates, or signatures illegible at the IRS receiving end. FaxTerra automatically optimizes resolution for IRS fax lines.
Send and save your delivery confirmation
Your fax service will provide a delivery confirmation showing that the IRS line received the transmission. Save this confirmation. It is your proof that you submitted on time — critical if there is a deadline involved (Form 2553, 8806, 8809) or a dispute about whether a form was filed.
Follow up if you expect a response
The IRS does not send fax confirmations automatically. If your form should generate a response (EIN by fax for SS-4, CP 261 for Form 2553), wait the stated processing window before calling the IRS. If you need to receive IRS faxes, you need a dedicated fax number — see our guide on receiving faxes from the IRS.
Common Mistakes That Get Faxes Rejected
The IRS processes millions of faxed forms per year. These are the most frequent reasons they are returned or ignored:
Frequently Asked Questions
Does the IRS accept faxes?
Yes, but only for specific forms. The IRS accepts faxes for EIN applications (SS-4), power of attorney (Form 2848), S-corp elections (Form 2553), tax transcript requests (Form 4506-T), and several others. Standard tax returns (1040, 1065, 1120) cannot be faxed.
How long does it take the IRS to process a faxed form?
Processing times vary by form. SS-4 EIN applications are typically processed in 4 business days. S-corp elections (Form 2553) take about 60 days before you receive CP 261 confirmation. Power of attorney and Form 8821 take 5–8 business days. Transcript requests (Form 4506-T) take 5–10 business days.
Will the IRS confirm it received my fax?
The IRS does not send automatic fax confirmations. Your fax service provides delivery confirmation — a record that the IRS fax line received the transmission. For EIN applications (SS-4), you'll receive your EIN by fax within 4 business days. For S-corp elections, you'll receive CP 261 by mail in about 60 days. For most other forms, there is no confirmation unless the IRS has questions.
What resolution should I use when faxing to the IRS?
Send at 300 DPI (dots per inch) or higher. This ensures the IRS can read all text, especially in smaller-print areas like signature blocks and taxpayer identification numbers. Most fax services default to a lower resolution — verify your settings before sending.
Can I fax an amended tax return (Form 1040-X) to the IRS?
No. The IRS does not accept Form 1040-X by fax. Amended returns must be mailed or, in some cases, e-filed. If you need faster processing, e-file the amendment through your tax software.
What happens if I fax to the wrong IRS number?
The fax will be received by the wrong IRS unit and may not reach the correct processing center. The IRS does not forward misdirected faxes — your form may be ignored or lost. Always verify the fax number on irs.gov before sending, and use form-specific guides to confirm which number applies to your state or situation.
Is faxing to the IRS secure?
Traditional fax lines are generally considered secure for tax purposes — the IRS has accepted fax for decades. Online fax services like FaxTerra use TLS 1.3 encryption in transit and AES-256 encryption at rest. Do not send tax documents through free consumer fax apps that do not disclose their security practices.
Can I get a fax number so the IRS can fax me back?
Yes. If you fax a form that may prompt an IRS response (like a rejected Form 2848 or a request for additional documentation), you need a dedicated fax number for the IRS to reach you. With a FaxTerra Starter subscription ($4.99/month), you get a dedicated fax number — you're notified by email and on your phone, and can view or download each incoming fax as a PDF from your inbox.
Form-Specific Guides
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