Government Fax Directory

IRS Fax Numbers & Filing Guide

We compiled every commonly used IRS fax number in one place. Whether you need to submit an installment agreement, verify your identity, or apply for an EIN, this guide shows you exactly where to fax and what to include.

IRS Fax Numbers by Department

Our team regularly hears from users who need to fax the IRS but cannot find the right number. Below are the most commonly used IRS fax lines, verified against IRS.gov publications.

Individual Income Tax Returns (Form 1040)

1-855-204-5020

For electronically filed returns that require a signature document (Form 8453). Do not fax full 1040 returns unless specifically instructed by the IRS.

Installment Agreement Requests (Form 9465)

1-855-887-7734

Use this number to fax Form 9465 for setting up a monthly payment plan on tax debt. Include your SSN and tax year on every page.

Identity Verification (Form 14039)

1-855-807-5720

For identity theft affidavits. Attach a copy of your government-issued photo ID and the IRS notice you received.

Employer ID Number (Form SS-4)

1-855-641-6935

Fax Form SS-4 to apply for an EIN. Processing typically takes 4 business days when faxed. Include a return fax number to receive your EIN.

Innocent Spouse Relief (Form 8857)

1-855-233-8558

For requesting relief from joint tax liability. Include all supporting documentation with your initial submission.

W-7 ITIN Applications

1-855-215-1627

For Individual Taxpayer Identification Number applications. Must include required identification documents or certified copies.

IRS fax numbers can change without notice. We update this page regularly, but always confirm the fax number on the IRS notice you received or at IRS.gov before sending sensitive documents.

Tips for Faxing the IRS

Avoid common mistakes that delay processing. These tips come from years of helping AvoFax users submit IRS documents.

Always include your SSN or EIN on every page of your fax — pages can get separated during processing.

Write the form number (e.g., 'Form 9465') in large text on your cover sheet so the IRS can route it immediately.

Keep your fax confirmation page as proof of submission. AvoFax stores delivery confirmations automatically.

Fax during off-peak hours (before 8 AM or after 6 PM EST) to reduce the chance of busy signals.

If your fax fails, retry in 30 minutes. IRS fax lines can be congested during tax season (January through April).

Never fax sensitive documents like full SSN cards. Only include SSN digits where the form specifically asks.

Frequently Asked Questions

Common questions about faxing documents to the IRS.

Fax the IRS from your computer or phone

No fax machine needed. Upload your form, enter the IRS fax number, and send. AvoFax delivers your document and stores the confirmation receipt.