Can I fax Form SS-4 to the IRS?

Yes. Faxing Form SS-4 is the fastest way to get an EIN if the online application is unavailable. Use 855-641-6935 for US businesses.

What is the fax number for Form 2553 (S-Corp)?

It depends on your state. Common numbers include 855-887-7734 and 855-214-7520. Check the guide for your specific state.

Can I fax my 1040 tax return?

Generally, no. You must e-file or mail your Form 1040. You should only fax a tax return if an IRS agent specifically requests it during an audit or notice resolution.

Is it safe to fax the IRS online?

Yes, provided you use a secure, encrypted fax service like mFax.to. These services comply with security standards to protect your SSN and data during transmission.

IRS Fax Numbers for Different Forms (2025 Guide)

Don't mail your tax forms if you don't have to. Complete list of IRS fax numbers for Form SS-4, 2553, 2848, 4506-T, and more—plus how to fax them securely online.