When you fax a form to the IRS, you hope it’s accepted. But if there’s a problem — a missing signature, a wrong form version, additional information needed — the IRS may fax back. Without your own number, that response goes nowhere.

Without a dedicated number

•Fax sent from a shared number
•If the IRS faxes back, the reply can’t reach you
•A rejection notice could go unnoticed for weeks
•Missed deadlines, penalties, or having to refile

With your own number

Fax sent from your dedicated number
Email & phone alerts on IRS responses; view as PDFs
Instant notification when a reply arrives
$4.99/month — less than the cost of one certified letter

Get a Number for IRS Replies

How to fax to the IRS

Step 1

Upload your form

Upload a PDF, Word document, or scan with your phone camera. Preview every page before sending.

Step 2

Enter the IRS fax number

Copy the number from the directory above, or enter it manually. We'll confirm it before sending.

Step 3

Send and track

Hit send. Get real-time delivery status and an email confirmation when the IRS receives your fax.

What it costs

Most IRS forms are under 10 pages — send them free. Longer documents like amended returns or Form 5472 with attachments may need a credit pack.

Free

10 pages/month

Enough for Form SS-4, W-9, or other short forms

$1.99

10 pages

For Form 5472 or short amended returns

$4.99

30 pages

For amended returns with attachments

See all pricing options →

Filing from outside the US?

You don’t need to be in the US to fax the IRS. Your location never affects a fax — only the destination number does, so you can send to any IRS line from anywhere in the world. Foreign-owned entities filing Form 5472 and founders applying for an EIN with Form SS-4 are among our most common senders.

Need the IRS to fax you back? A dedicated US fax number works from anywhere — the reply lands in your inbox no matter where you live. See how receiving works.

IRS Form Guides

Step-by-step fax instructions for every common IRS form — fax numbers, deadlines, and tips from official sources.

Form SS-4 — EIN Application

Apply for an Employer Identification Number by fax

Form 2553 — S-Corp Election

Elect S-corporation tax treatment for your LLC or corporation

Form 5472 — Foreign-Owned Entities

Annual disclosure requirement for foreign-owned US LLCs

Form 2848 — Power of Attorney

Authorize a representative to act on your behalf with the IRS

Form 8821 — Tax Info Authorization

Designate someone to receive your IRS tax information

Form 4506-T — Transcript Request

Request copies of tax return transcripts by fax

Form 8802 — Residency Certification

Apply for a US Tax Residency Certificate for treaty benefits

Form 8809 — Info Return Extension

Extend deadlines for filing 1099s, W-2s, and similar forms

Form 8806 — Acquisition of Control

Report M&A transactions — fax only, mail no longer accepted

147C Letter — EIN Verification

Request your EIN verification letter from the IRS

CP 575 — EIN Confirmation

Understand your IRS EIN assignment letter

Receiving Faxes from the IRS

Get a fax number so the IRS can reach you back

Proof of Filing by Fax

Keep documentation proving your fax was received

Can I Fax My Tax Return?

Which personal tax forms can and cannot be faxed to the IRS

Complete IRS Fax Number Directory

Every IRS fax number in one place, organized by form and department

How to Fax the IRS — Full Guide

Step-by-step guide covering every form, common mistakes, and deadlines

Common Questions

Can I really fax to the IRS for free?

Yes. FaxTerra gives you 10 free pages per month — enough for most IRS forms. If your document is longer, credit packs start at $1.99 for 10 pages. No subscription required just to send.

How long does the IRS take to process a faxed form?

It varies by form. Faxed EIN applications (SS-4) are typically processed within 4 business days — much faster than the 4-6 weeks by mail. Form 5472 and amended returns depend on IRS workload but are generally faster than mailed submissions.

Will the IRS know my fax came from an online service?

Your fax arrives at the IRS exactly as you sent it — clean, with no ads or branding. If you subscribe, your dedicated fax number appears as the sender. The IRS sees a normal fax, indistinguishable from one sent by a fax machine.

What if the IRS needs to fax something back to me?

Without a dedicated number, faxes are sent from a shared number — if the IRS responds, the reply has nowhere to go. With a FaxTerra subscription ($4.99/month), your faxes go out from your own number. If the IRS faxes back a rejection notice, a request for more information, or a confirmation, you're notified by email and on your phone, with the document ready to view or download as a PDF from your inbox.

Which IRS forms can I fax?

The IRS accepts many forms by fax, including Form SS-4 (EIN application), Form 5472, Form 2848 (Power of Attorney), Form 8821 (Tax Information Authorization), Form 1040-X (Amended Return), and Form 911 (Taxpayer Advocate). Each has a specific fax number — see the directory above.

I need to fax Form 5472. Can I e-file it instead?

No. Form 5472 for foreign-owned single-member LLCs cannot be e-filed — the IRS requires it by mail or fax. Faxing is significantly faster and gives you a delivery confirmation. The fax number for Form 5472 is (855) 887-7737.

Is it secure to fax tax documents online?

Yes. FaxTerra uses TLS 1.3 encryption in transit and AES-256 encryption at rest. Your documents are never shared with third parties. This is the same level of encryption used by banks and healthcare providers.

Trusted for time-sensitive faxes

Excellent · TrustScore 4.4 · 12 reviews

Quick, easy and actually free

This is by far the quickest, easiest way to send a fax anywhere. No hassle, easy signup with just your Google account, decent amount of pages per month, and you don't have to deal with advertisements or watermarks added to your documents. Highly recommended!

Ryan Harrelson·US·via Trustpilot

Great fax app

I checked several different fax apps and this was by far the best I found. Highly recommend.

Barbara·MX·via Trustpilot

We only needed one service

We only needed one service, a .pdf file faxed to a number, but it performed that service without issue. We knew that this was an often-busy fax number we were sending to, but it informed us that the attempt timed out, and after we chose 'retry', it went through without problem. Quick, easy, responsive, we had no issues with it.

David Sass·FR·via Trustpilot

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