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Fax IRS forms with the correct number, every time

Faxing the IRS sounds simple until you discover the right number depends on the form, your state, and whether you're filing domestically or from abroad. These guides give you verified fax numbers (sourced from IRS.gov), filing checklists, and step-by-step instructions for the most-faxed IRS forms.

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All IRS fax guides

Editorial illustration of an IRS tax form being faxed
How-to · 8 min read

How to fax the IRS in 2026

The complete guide to faxing the IRS, what you can and can't fax, finding the right number, and what to include in your cover sheet.

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Editorial illustration of US fax number directory
Reference · 6 min read

IRS fax numbers (2026)

Verified fax numbers for every common IRS form, organized by purpose. Includes domestic and international filing locations.

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Editorial illustration of IRS Form SS-4 EIN application
Form guide · 9 min read

How to fax Form SS-4 (EIN application)

Apply for an Employer Identification Number by fax. Includes the right fax number, what to write, and how long it takes.

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Editorial illustration of IRS Form 2553 S-corp election
Form guide · 8 min read

How to fax Form 2553 (S-corp election)

Elect S-corp tax status by fax with the 75-day deadline. State-by-state routing and step-by-step filing.

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Editorial illustration of IRS Form 2848 Power of Attorney
Form guide · 7 min read

How to fax Form 2848 (Power of Attorney)

Authorize a CPA, EA, or attorney to represent you before the IRS. CAF unit routing by state.

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Editorial illustration of IRS Form 8821 Tax Information Authorization
Form guide · 7 min read

How to fax Form 8821 (Tax Information Authorization)

Authorize a third party to receive your tax information without granting representation rights.

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Editorial illustration of IRS Form 3911 refund inquiry
Form guide · 5 min read

How to fax Form 3911 (Refund inquiry)

Trace a missing refund check. Generally mailed, but faxable when the IRS letter requests it.

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Editorial illustration of IRS Form 8962 Premium Tax Credit
Form guide · 6 min read

How to fax Form 8962 (Premium Tax Credit)

Reconcile your Premium Tax Credit when the IRS sends Letter 12C. Unblock your refund.

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Editorial illustration of IRS Form 433 Collection Information Statement
Form guide · 8 min read

How to fax Form 433 (Collection Information)

Submit financial statement for installment agreements, OIC, or currently not collectible status.

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Editorial illustration of IRS CP2000 underreporter notice
Notice response · 6 min read

How to fax an IRS CP2000 response

Respond to the IRS underreporter notice within 30 days. Agree, disagree, or partially agree.

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Editorial illustration of IRS audit response
Audit response · 8 min read

How to fax an IRS audit response

Reply to Letter 525, 566, 915, 3219, use the examiner's fax number on your letter.

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Editorial illustration of fax from iPhone
How-to · 7 min read

How to fax the IRS from iPhone

Scan paper forms with iPhone camera, upload PDFs, send in 60 seconds. No fax machine needed.

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Editorial illustration of fax from Android
How-to · 7 min read

How to fax the IRS from Android

Use the Faxend web app on Chrome, no install, no subscription. Scan with Drive or upload PDFs.

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Editorial illustration of IRS fax cover sheet template
Resource · 5 min read

IRS fax cover sheet template

Free copy-paste template, what to include, by form type. Or let Faxend auto-generate one for you.

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Send your IRS fax in 60 seconds

Upload your form. Enter the IRS fax number. We add the cover sheet and confirm transmission. Pay $2.99 for up to 5 pages, no subscription.

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