IRS Fax Numbers: Where to Fax Every Form (2026)
Searching for “the IRS fax number”? There isn’t one. The IRS only accepts faxes for specific forms, sent to form-specific numbers that usually depend on your state. Pick your form below to get the exact fax number and send it in minutes.
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Fax numbers and addresses were last verified July 17, 2026. The IRS can change them at any time — always confirm against the official source: IRS.gov — Where to File.
There is no general IRS fax number
The IRS does not publish a single, catch-all fax line where you can send anything. In practice there are only two situations where faxing the IRS is correct:
- Faxing a specific form that the IRS accepts by fax — such as Form 2553, SS-4, 2848, or 8821 — to that form’s dedicated fax number. For most of these, the correct number depends on the state where your business or residence is located.
- Replying to an IRS notice or letter at the fax number printed on that notice. When the IRS asks for a response (for example a CP2000 or an audit letter), the response instructions include a fax number specific to that case — use it, and include a copy of the notice as your cover page.
If you are trying to fax something that isn’t on a form’s accepted list and you don’t have a notice with a fax number, faxing is usually not the right channel — you likely need to e-file or mail instead.
You cannot fax a Form 1040 tax return
One of the most common searches is “IRS 1040 fax number” — but the IRS does not accept individual income tax returns (Form 1040) by fax. There is no 1040 fax line. If you send a 1040 to a random IRS fax number, it will not be treated as a filed return. Your real options are:
- E-file. This is the fastest and IRS-preferred way to file a 1040, and it gives you an electronic acknowledgment that the return was accepted.
- Mail the paper return to the IRS address for your state (the correct address depends on your state and on whether you are enclosing a payment). The IRS “Where to File” page lists the address for each state.
- Responding to a notice or audit? If the IRS contacted you about your 1040 — for example a CP2000 proposing changes, or an examination — fax your response and supporting documents to the fax number printed on that specific notice. That is the only time a “1040 fax” is appropriate, and it goes to your case, not to a general line.
The same is true of a few other forms. Form 8379 (Injured Spouse Allocation) also cannot be faxed — you attach it to your return or mail the standalone form. And forms tied to an open case, such as Form 433-D and Form 8962, have no general fax line — you fax them only to the number printed on your IRS notice or letter.
IRS forms you can fax
Choose your form for the exact fax number — or, for notice-driven and non-faxable forms, the correct way to submit it.
| Form | What it’s for | Fax numbers | Link |
|---|---|---|---|
| Form 2553 | Elects S corporation tax status for an eligible corporation or LLC. | (855) 887-7734 / (855) 214-7520 | Get number |
| Form SS-4 | Applies for a federal Employer Identification Number (EIN) for a business or entity. | (855) 641-6935+ international | Get number |
| Form 2848 | Authorizes a representative to act on your behalf before the IRS. | (855) 214-7519 / (855) 214-7522+ international | Get number |
| Form 8821 | Authorizes a person or firm to receive and inspect your confidential tax information. | (855) 214-7519 / (855) 214-7522+ international | Get number |
| Form 433-D | Finalizes a direct-debit IRS installment agreement using the terms the IRS or a revenue officer gave you. | On your IRS notice | Get number |
| Form 8962 | Reconciles the health-insurance Premium Tax Credit; most people fax it only when replying to IRS Letter 0012C. | On your IRS notice | Get number |
| Form 14039 | Reports tax-related identity theft to the IRS; can be submitted online, by fax, or by mail. | (855) 807-5720 | Get number |
| Form 8379 | Reclaims an injured spouse’s share of a joint refund — filed with your return or mailed, never faxed. | Cannot be faxed | Get number |
| Form SS-8 | Asks the IRS to formally rule whether a worker is an employee or an independent contractor. | (855) 242-4481 | Get number |
Where to fax Form 2553
Election by a Small Business Corporation
Where to fax Form SS-4
Application for Employer Identification Number
Where to fax Form 2848
Power of Attorney and Declaration of Representative
Where to fax Form 8821
Tax Information Authorization
Where to fax Form 433-D
Installment Agreement
Where to fax Form 8962
Premium Tax Credit (PTC)
Where to fax Form 14039
Identity Theft Affidavit
Where to fax Form 8379
Injured Spouse Allocation
Where to fax Form SS-8
Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding
IRS fax number FAQ
Last verified July 17, 2026. Official source: IRS.gov — Where to File