How to Fax Form SS-4: Your EIN by Fax
You need an EIN, the online tool either rejected you or does not fit your situation, and now you are staring at Form SS-4 wondering where it actually goes. Good news: the IRS runs a dedicated fax line for it, the EIN itself costs nothing, and the fax costs $1.00. Here is the whole picture, including when you should skip the fax and use the free online tool instead.
📌 The numbers, straight from the IRS "Where to file your taxes for Form SS-4" page on IRS.gov, verified July 2026: businesses in any of the 50 states or DC fax Form SS-4 to 855-641-6935 (EIN Operation, Cincinnati). Entities with no legal residence or principal office in any state fax 855-215-1627 from within the US. Applying from outside the US entirely is a different lane: 304-707-9471, covered in our sister guide at OverseasFax. Verify on IRS.gov before sending, because IRS numbers change.
First, the Honest Part: Try the Free Online Tool
If the responsible party has an SSN or ITIN, the IRS online EIN assistant issues your number instantly, free, during its operating hours, and this page will not pretend otherwise. The fax lane exists for everyone the online tool turns away, and that group is bigger than you would think: applications that hit the dreaded reference 101 error (usually a business name conflict or a responsible party already tied to another same-day application), entities whose responsible party has no SSN or ITIN, trusts and estates with wrinkles the online flow cannot express, formation agents filing for clients, and anyone applying outside the tool's hours with a bank appointment in the morning.
Why Fax Beats Mail for the Paper Route
Once you are on paper, the choice is fax or mail, and it is not close. The IRS returns a faxed application's EIN by fax in about 4 business days when you provide a return fax number. Mailed applications take around 4 to 5 weeks. If a bank, payroll provider, or state registration is waiting on your EIN, that difference is the whole ballgame.
Filling Out the SS-4 Without Tripping
Download the current form from IRS.gov (revision December 2025 as of this writing). The lines that cause the most trouble: line 7b takes the responsible party's SSN or ITIN, lines 4 and 5 want a real mailing address where IRS correspondence will actually reach you, and the entity type box determines your filing obligations, so check exactly one and mean it. Sign it, date it, and use one application method only: fax it or mail it, never both, because duplicate applications create duplicate EINs and months of cleanup. If your plan is an S corporation, sequence matters: EIN first by fax, then Form 2553 by fax once the EIN exists, since the election form is rejected without a real EIN on it.
The $250 EIN Scam, Since You Will Meet It
Search results for EIN applications are crowded with services charging $75 to $300 to "process" your application. The EIN is free. It has always been free. Those services fill out the same SS-4 you are holding and send it to the same fax number printed above. The entire legitimate cost of the paper route is the fax transmission, which is $1.00 here, and your time, which is about ten minutes.
Faxing It for $1.00
1
Verify the number on IRS.gov
The "Where to file your taxes for Form SS-4" page is the controlling source. As of July 2026: 855-641-6935 for the 50 states and DC.
2
Scan the signed form
One clean PDF or clear photos, every field legible, signature crisp. Include a return fax number on the form if you want the EIN faxed back in about 4 business days.
3
Send at faxforadollar.com
Upload, enter the number, pay $1.00 for up to 10 pages. Delivery in 1 to 3 minutes with an email confirmation to keep until your EIN arrives.
💡 Need to receive the IRS's return fax but have no fax number? Our sister service GetAFax.com provides a dedicated US fax number for 24 hours for $5, delivered to your email as PDFs. Or leave the return fax line blank and the IRS mails the EIN letter instead, which adds weeks.
Frequently Asked Questions
What is the fax number for Form SS-4?
Per the IRS Where to File page for Form SS-4 on IRS.gov, verified July 2026: businesses whose principal office or legal residence is in any of the 50 states or DC fax to 855-641-6935. Entities with no legal residence or principal office in any state fax 855-215-1627 from within the US. Confirm on IRS.gov the day you send, because IRS fax numbers change.
Do IRS fax numbers for the SS-4 change, and how do I verify?
They change without fanfare, which is why every number on this page is dated and sourced to the IRS Where to File page for Form SS-4. Open that page on IRS.gov right before faxing and match the number. Thirty seconds of checking protects a filing your bank is waiting on.
What is the cheapest way to get an EIN?
Free, through the IRS online EIN assistant, if the responsible party has an SSN or ITIN. That is the honest answer and the one the $250 filing services hope you never hear. If the online tool rejects you or does not fit, the cheapest paper route is faxing the SS-4 yourself: $1.00 in transmission cost, nothing else.
What is the cheapest way to fax Form SS-4 to the IRS?
$1.00 at faxforadollar.com, covering up to 10 pages, no account or subscription. An SS-4 is 1 to 2 pages, so the base price covers it with room for a cover sheet. Fax shops and hotel business centers charge $5 to $15 for the same transmission.
Is getting an EIN really free?
Yes, completely. The IRS charges nothing for an EIN by any method. Services charging $75 to $300 to obtain your EIN are filling out the same one-page form and sending it to the same numbers listed here. The only legitimate cost on the fax route is the transmission itself.
Should I fax Form SS-4 or apply online?
Online, if you can: the IRS online EIN assistant issues the number instantly and free during its hours, when the responsible party has an SSN or ITIN. Fax when the tool turns you away: reference 101 errors, no SSN or ITIN for the responsible party, complex trusts and estates, or third parties filing for clients.
What is a reference 101 error and how does faxing fix it?
The online tool's most common rejection, usually meaning a business name conflict or an entity question the tool cannot resolve automatically. The fix is the paper route: a human at the IRS reviews a faxed SS-4 and resolves what the software could not. Fax it to your number from the table above and expect the EIN back in about 4 business days.
How long does it take to get an EIN by fax?
About 4 business days when you include a return fax number on the form, per the IRS. Without a return fax number, the EIN letter comes by mail instead, which takes several weeks. Online is instant; mail applications take 4 to 5 weeks. Fax is the fast paper lane.
Does the IRS fax my EIN back to me?
Yes, to the return fax number you write on the SS-4, generally within 4 business days. You need a number that can receive: a home fax line, an office machine, or a temporary receiving number. Our sister service GetAFax.com rents a dedicated US fax number for 24 hours for $5 with received faxes emailed to you as PDFs.
Can I fax Form SS-4 without a fax machine?
Yes. Upload the scanned form at faxforadollar.com from any phone or computer browser, enter the IRS number, pay $1.00. No machine, no landline, no app, no account. Receiving the return fax is the only part that needs a real fax number, and there are cheap 24-hour rentals for that.
How many pages is a Form SS-4 fax?
The form is one page; with an optional cover sheet you are at two. Comfortably inside the $1.00 tier, which covers up to 10 pages.
What goes on line 7b of Form SS-4?
The responsible party's SSN or ITIN. For most US applicants that is the owner's Social Security Number. A nonresident alien sole proprietor with no US taxpayer number has different options, and applicants outside the US entirely follow the international route, which our OverseasFax sister guide covers in depth.
Can I fax the SS-4 and also mail it to be safe?
No, pick one. Duplicate applications risk duplicate EINs assigned to the same entity, which confuses banks and IRS records and takes months to untangle. Fax it, keep the confirmation, and wait out the 4 business days.
Do I need an EIN before filing Form 2553 for S corp status?
Yes. Form 2553 requires a real EIN, not one in progress, and an election filed without it gets rejected while your deadline clock keeps running. Sequence: SS-4 by fax, EIN back in about 4 days, then the 2553 to its own state-based fax number. Our Form 2553 guide covers that second step.
What is the fax number for SS-4 if my business has no US state residence?
855-215-1627 when applying from within the US, per the IRS Where to File page. That covers entities with no legal residence, principal place of business, or principal office in any state. Applying from outside the US uses 304-707-9471, which is the international lane.
Can I get an EIN by fax from outside the United States?
Yes, through the international number, 304-707-9471, and the process has its own wrinkles: line 7b handling without an SSN, the return fax question from abroad, and more. Our sister site OverseasFax runs a dedicated guide for exactly that situation, including sending the fax from any of 93 countries.
Does the IRS confirm receiving my faxed SS-4?
Not at transmission time. Your fax delivery confirmation is the receipt: FaxForADollar emails one showing the destination number, page count, and timestamp. Keep it until the EIN arrives; if 4 business days pass in silence, it is your evidence when you call the IRS business line.
What happens if my fax to the IRS EIN line fails?
Automatic full refund, and you can retry immediately. IRS fax lines run around the clock but get congested during business hours; early morning Eastern time connects fastest.
Can my accountant or formation service fax the SS-4 for me?
Yes, and third-party designees are a normal part of the form (there is a designee section for exactly this). Just know what you are paying for: the professional value is the form being right, not the transmission, which costs $1.00 whoever presses send.
Can I fax Form SS-4 on a weekend?
Yes, the IRS fax lines receive around the clock and your timestamp records on arrival. Processing starts the next business day, so a Sunday night fax and a Monday 6am fax reach the same queue.
What resolution should my scanned SS-4 be?
300 DPI or better, black and white, signature crisp. The IRS processes what it can read, and an illegible entry stalls the application. If it looks marginal on your own screen, rescan.
Is it safe to fax a form with my SSN on it?
Fax is a point-to-point transmission to an IRS intake line, which is why the agency still accepts sensitive applications this way. On our side: encrypted HTTPS upload, documents deleted immediately after sending, Stripe handling payment with no card details stored.
How much does it cost to fax the IRS?
$1.00 for up to 10 pages on FaxForADollar, which covers the SS-4, the 2553, notice responses, and most anything else the IRS accepts by fax. Larger packets: $1.99 to 25 pages, $2.99 to 50, $4.99 to 100. No account, no subscription.
Do I need a new EIN if my business information changes?
Usually not for address or responsible party changes, which are reported on Form 8822-B within 60 days per the IRS, not with a new SS-4. Structural changes like incorporating a sole proprietorship do require a new EIN. When in doubt, that is a tax professional question.
Can a trust or estate apply for an EIN by fax?
Yes, and trusts and estates are frequent users of the fax lane precisely because the online tool handles their situations awkwardly. The executor, trustee, or fiduciary completes the SS-4 for the entity type and faxes it to the same state-based number.
Can I use the EIN as soon as the IRS faxes it back?
Generally yes: the number on the returned SS-4 is your active EIN. Some banks insist on the formal CP 575 confirmation letter, which arrives by mail regardless, so keep both when it shows up.
What is the cheapest way to fax the IRS from home?
Your browser: upload at faxforadollar.com, enter the number, $1.00. No trip to a fax shop, no $10 hotel business center, no monthly fax subscription for a once-a-year need. Our cheapest-way guide compares every option if you want the full price landscape.
What if I lose my EIN after getting it?
Check the faxed-back SS-4, the CP 575 letter, old tax returns, or bank paperwork first. Failing all that, the IRS business line can verify it to an authorized person. Do not file a new SS-4 to replace a lost number; the EIN still exists.
Does every business need an EIN?
Corporations, partnerships, and anyone with employees, yes. Single-member LLCs and sole proprietors without employees can often use the owner's SSN for federal taxes, but banks, payment processors, and licensing agencies frequently demand an EIN anyway, which is why nearly everyone ends up getting one.
Can I fax the SS-4 from my iPhone or Android?
Yes. Photograph the signed form in good light, upload at faxforadollar.com in your phone browser, enter the number, pay $1.00. Our iPhone and Android guides walk through it step by step.
How do I fax the IRS for cheap without a subscription?
Pay per fax. Subscriptions make sense for weekly faxers; for the couple of times a year a business faxes the IRS, $1.00 per transmission with no recurring anything is the cheap route. That is the entire business model of this site.
Is the 855-641-6935 number only for Form SS-4?
It is the EIN Operation fax line, so keep it to EIN applications. Notices, payments, and other forms have their own destinations, and mixing forms into the wrong intake line is how documents get lost. Our complete IRS faxing guide maps where everything else goes.
SS-4 signed and ready?
Verify the number on IRS.gov, then send it in three minutes. $1.00 for up to 10 pages with a delivery confirmation to keep until your EIN arrives.
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