IRS fax numbers by form and state

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.

IRS forms you can fax

Choose your form for the exact, state-specific fax number and a prefilled way to send it.

FormWhat it’s forFax numbersLink
Form 2553Elects S corporation tax status for an eligible corporation or LLC.(855) 887-7734 / (855) 214-7520Get number
Form SS-4Applies for a federal Employer Identification Number (EIN) for a business or entity.(855) 641-6935+ internationalGet number
Form 2848Authorizes a representative to act on your behalf before the IRS.(855) 214-7519 / (855) 214-7522+ internationalGet number
Form 8821Authorizes a person or firm to receive and inspect your confidential tax information.(855) 214-7519 / (855) 214-7522+ internationalGet number

IRS fax number FAQ

Last verified July 17, 2026. Official source: IRS.gov — Where to File