The Short Answer
No. The IRS does not accept Form 1040 by fax. There is no IRS fax number published for 1040 submissions, and any fax sent to a general IRS number will not be processed as a return.
The IRS accepts Form 1040 through two methods only:
- Electronically, via IRS Free File, a tax software product (TurboTax, H&R Block, TaxAct, etc.), or a tax professional's e-file system
- By mail, to the address for your state and filing type listed in the Form 1040 instructions
If you are under a deadline and looking for a fax-based shortcut for your 1040, there is no such shortcut. This article explains the exceptions — forms that can be faxed — and what to do if you missed a deadline.
Why Can't Form 1040 Be Faxed?
Form 1040 is the main tax return for individuals. Historically, the IRS did accept paper returns via fax in a limited set of situations, but this changed in the late 2000s as e-filing matured. Today:
- The IRS processes over 90% of individual returns electronically.
- Remaining paper returns are mailed to service centers that scan and image-process submissions — not fax centers.
- There is no staffed fax receiving operation for individual returns.
A 1040 sent to a fax number — even a real IRS number for a different purpose — is unlikely to be routed to a processing center. The CAF Unit at 855-214-7522, for example, handles Power of Attorney authorizations, not returns.
Which IRS Forms Can Be Faxed
While 1040 cannot be faxed, a number of supporting forms and authorizations can. Faxing is actually preferred by the IRS for some of these because it is faster than mail. Here is the list:
Forms That the IRS Accepts by Fax
| Form | Purpose | Fax Number | Notes |
|---|---|---|---|
| Form 4506-T | Request for Transcript of Tax Return | 855-587-9604 (Southern region), 855-298-1145 (Western), 855-821-0094 (Central) | Use the region that matches your state |
| Form 4506-C | Request for Transcript via IVES | 844-254-3015 | Used by lenders and third parties |
| Form 2848 | Power of Attorney and Declaration of Representative | 855-214-7522 (domestic), 304-707-9785 (foreign address) | CAF Unit |
| Form 8821 | Tax Information Authorization | 855-214-7522 | CAF Unit (same as 2848) |
| Form SS-4 | Application for Employer Identification Number | 855-641-6935 (domestic), 855-215-1627 (international applicants in the US) | EIN assigned by fax or phone |
| Form 8822 | Change of Address | Varies by state; see 8822 instructions | Not widely fax-submitted |
| Form 2553 | Election by a Small Business Corporation (S-Corp) | 855-270-4081 or 855-887-7734 | Fast-track for S-corp elections |
| Form 990-N extension requests | Small nonprofit extensions | Call 877-829-5500 first |
Always check the IRS website for the current fax number before sending, because the IRS occasionally reassigns fax numbers by region.
Forms That the IRS Does NOT Accept by Fax
| Form | Required method |
|---|---|
| Form 1040 (and variants 1040-SR, 1040-NR, 1040-X) | E-file or mail |
| Form 1120 (C-Corp return) | E-file or mail |
| Form 1065 (Partnership return) | E-file or mail |
| Form 1041 (Trust/Estate return) | E-file or mail |
| Form 941 (Employer quarterly) | E-file or mail |
| Form 5500 (Retirement plan annual) | DOL electronic system |
| Most 1099 and W-2 forms | E-file through FIRE or SSA |
The pattern: tax returns cannot be faxed. Authorizations, transcripts, and certain elections can.
What to Do If You Missed the Filing Deadline
If you are researching "can I fax my 1040 to the IRS" because the deadline is imminent and you are hoping a fax will count as on-time, here is the reality and the options:
-
E-file today. The IRS accepts e-filed returns until midnight local time on the deadline date. If you use any commercial tax software, you can complete and transmit a return in 30–90 minutes for a simple filing. Free File is available for incomes under a threshold (adjusted each year, typically $84,000–$85,000 in recent years).
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File an extension (Form 4868). This gives you six additional months to file but does not extend the deadline to pay. Form 4868 can be e-filed for free through IRS Free File or any tax software. It can also be mailed, but there is no fax option for this form either.
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Mail the return, postmarked by the deadline. A return mailed and postmarked on the deadline date is considered timely filed. Use Certified Mail with Return Receipt to get proof.
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Accept the late-filing penalty. If you cannot file on time, file as soon as possible. The failure-to-file penalty is 5% of unpaid tax per month, up to 25% of the unpaid balance. The failure-to-pay penalty is 0.5% per month. Filing late and paying late are separate penalties; filing even an incomplete return can stop the failure-to-file clock.
None of these options involve fax.
A Related Question: "But My Accountant Said to Fax Form X"
Accountants frequently fax supporting forms to the IRS on a client's behalf. This is normal, but the form being faxed is almost always one of:
- Form 2848 (authorizing the accountant to represent the client) — faxable
- Form 4506-T (requesting a transcript for a client) — faxable
- Form 8821 (authorizing the accountant to receive client tax info) — faxable
Your accountant is not faxing your 1040. They are faxing the authorization that lets them e-file your 1040 or pull your transcripts. The 1040 itself still goes through e-file or mail.
How to Fax a Form That IS Faxable
If you need to fax one of the IRS forms that is accepted by fax (4506-T, 2848, 8821, etc.), here is the process:
- Complete the form per the current instructions.
- Sign it. Unsigned forms are rejected.
- Prepare a cover sheet with:
- Your name and taxpayer identification number (SSN or EIN)
- A callback number
- The form name and purpose
- The number of pages (including the cover sheet)
- Fax to the number listed in the form's instructions for your region or situation.
- Keep the fax transmission confirmation receipt.
FaxChat's pay-per-use option can send a signed PDF to the IRS for $1.50 + $0.30/page with no account required. Cover sheets are auto-generated and included free. The transmission receipt is a downloadable Stripe PDF, suitable for your tax records.
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Send a fax →Frequently Asked Questions
Can I fax Form 1040-X (amended return) to the IRS? No. Form 1040-X must be e-filed (for recent tax years, 2021 and later) or mailed. There is no fax submission option.
What fax number should I never fax to for a 1040? Any. There is no valid fax number for 1040 submissions. If someone tells you to fax your 1040 to an IRS number, it is either a misunderstanding (they mean a related authorization form) or a scam.
Is there a way to fax my 1040 to a tax professional for them to file? Yes, you can fax your completed 1040 PDF to your accountant or tax preparer. They would then e-file or mail it on your behalf. In this case, the fax transmission is between you and your accountant, not between you and the IRS.
What about state returns — can I fax those? State acceptance varies. Most state departments of revenue do not accept state income tax returns by fax for the same reasons as the IRS. A few accept specific forms (payment vouchers, extension requests) by fax. Check your state department of revenue's website for the definitive answer.
How do I confirm the IRS received a faxed form? Keep the fax transmission confirmation from the sender's side (FaxChat provides a Stripe receipt with delivery status). The IRS does not send a separate confirmation; processing typically takes 2–4 weeks. For time-sensitive matters, call the IRS Practitioner Priority Service (tax professionals) or the general IRS line after two weeks to confirm receipt.