IRS Form SS-4

The application form for obtaining a federal EIN from the IRS, used by non-residents via the fax-application path.

Definition

Form SS-4 is the IRS's official EIN application form. The online application at irs.gov requires the responsible party to enter a valid SSN or ITIN, which excludes most non-residents. Non-residents file Form SS-4 by fax to the IRS international EIN unit, with 'Foreign' in the SSN field for the responsible party.

Context

Form SS-4 is updated annually but field numbers and structure remain consistent. The form has 18 lines plus signature. For a non-resident single-member LLC, the key fields are Line 1 (LLC legal name), Line 7a-b (responsible party name and SSN field with 'Foreign'), Line 8a (LLC checkbox), Line 9a (entity type), and Line 10 (reason for applying).

Example

Delewarellc prepares Form SS-4 for every customer during Days 6-8 of the 8-10 day timeline. The form is filled with the founder's full legal name as on passport, 'Foreign' on Line 7b, and 'Started new business' as the reason. Faxed to the IRS international EIN line, the EIN comes back in 1-2 business days.

Common pitfalls

Passport number in SSN field: most common DIY rejection.
Wrong entity classification on Line 9a: 'Other' for single-member disregarded entities, 'Partnership' for multi-member.
Missing signature on Line 18: silent rejection.
LLC name on Line 1 not matching the Certificate of Formation exactly: rejection.

What Form SS-4 Actually Does in the Formation Sequence

Form SS-4 is the single piece of paper that converts a freshly registered Delaware LLC into an entity the United States tax and banking systems can recognize. The Certificate of Formation, filed with the Delaware Division of Corporations for $110, creates the legal shell. That shell has a name and a registered agent, but it has no federal tax identity. Form SS-4 is the request that asks the Internal Revenue Service to assign an Employer Identification Number to the entity. Without that number, the LLC cannot open a US business account at Mercury, Wise, Relay, Lili, or Payoneer, cannot connect a Stripe or PayPal account in the entity name, and cannot file the federal information returns that a foreign-owned LLC is responsible for.

For a non-resident founder, the form sits in a specific spot in the timeline. Formation comes first because Line 1 of the SS-4 must carry the exact legal name shown on the Certificate of Formation, and the IRS cross-checks nothing at the moment of issuance but a later mismatch can create headaches when a bank verifies the entity. The practical order is form the company, obtain the stamped Certificate, then submit Form SS-4. The free EIN that results typically arrives in roughly 8 to 10 business days when the form is faxed correctly to the IRS international unit.

It helps to think of Form SS-4 not as a tax filing but as an identity request. It does not by itself create any tax liability, it does not register the founder personally with the IRS, and it does not start any clock on income tax. It simply produces a number. Everything downstream, from banking to the annual Form 5472 obligation, depends on that number existing, which is why the form deserves careful attention even though it looks short.

Why the Online Application Is Closed to Most Non-Residents

The IRS offers an online EIN Assistant that issues a number in minutes, and many founders read about it and assume it applies to them. It usually does not. The online tool requires the responsible party to enter a valid Social Security Number or Individual Taxpayer Identification Number. A founder living in Dhaka, Lagos, Manila, or Karachi who has never worked in the United States generally holds neither. The system has no field that accepts a foreign passport number or a foreign tax identifier, so the application cannot be completed online no matter how many times it is attempted.

This is the core reason Form SS-4 exists as a separate paper or fax path. The form contains a field for the responsible party's SSN or ITIN, and the IRS instructions allow a non-resident who has neither to write the word Foreign in that field. That single instruction is what opens the door for international founders. The online tool offers no equivalent, which is why a non-resident who tries to force the online route either gets stuck at the identification screen or, worse, enters an unrelated number and creates a record that later has to be untangled.

There is a narrow exception worth naming so the distinction stays honest. A non-resident who does happen to hold an ITIN, perhaps from a prior US filing obligation, can sometimes use the online tool. But for the large majority of first-time foreign founders forming a Delaware LLC purely to serve customers abroad or sell into the US market remotely, the fax path with Form SS-4 is the route that actually works, and planning around it from the start avoids wasted days.

Reading the Responsible Party Field Correctly

Line 7a asks for the name of the responsible party and Line 7b asks for that person's SSN, ITIN, or EIN. For a single-member foreign-owned LLC, the responsible party is the human being who owns and controls the company, which is the founder. The IRS defines the responsible party as the individual who ultimately owns or controls the entity or who exercises ultimate effective control over it. For a one-person LLC there is rarely any ambiguity. The founder names themselves, using the full legal name exactly as it appears on the passport, and writes the word Foreign in the 7b field.

The phrase ultimate effective control matters because the IRS does not want a nominee, an agent, or a formation company listed as the responsible party. The registered agent in Delaware is not the responsible party. The formation service that prepares the paperwork is not the responsible party. Listing any of those parties instead of the actual owner misstates the record and can cause problems if the IRS ever needs to verify ownership, or if a bank later asks for documentation that matches the EIN record. The owner goes on Line 7a even when a service handles the mechanics.

Spelling and ordering on this line should mirror the passport rather than any informal version of the name. If the passport reads a given name and two family names, all of them belong on the line in the same order. Banks performing know-your-customer checks compare the EIN confirmation letter against passport details, and a name that is shortened or reordered on the SS-4 can surface as a discrepancy during account opening even though the underlying person is the same.

Entity Classification on Line 9a for a Single-Member LLC

Line 9a asks for the type of entity, and this is where many do-it-yourself applications go wrong. A single-member LLC owned by one foreign individual is, by default, a disregarded entity for federal tax purposes. The correct selection on Line 9a for that structure is the Other category, where the applicant writes a short description such as foreign-owned single-member LLC or disregarded entity. Selecting Partnership is wrong for a one-owner company because a partnership requires at least two owners, and selecting Corporation changes the tax treatment in ways the founder almost certainly did not intend.

The classification choice on the SS-4 does not permanently lock the entity into a tax category, but it sets the IRS's initial expectation and influences what notices the entity receives. A single-member LLC marked correctly as a disregarded entity will be expected to file Form 5472 attached to a pro forma Form 1120 each year, not a partnership return. A multi-member LLC, by contrast, is treated as a partnership by default and files Form 1065. Getting Line 9a right means the IRS's records align with the filings the founder will actually make, which reduces the chance of mismatched-notice letters.

Founders sometimes ask whether checking a box wrong here is fatal. It usually is not catastrophic, because classification can be corrected or elected separately, but an incorrect entry creates avoidable friction. The cleaner path is to mark the LLC checkbox on Line 8a, answer the follow-up about the number of members, and then describe the entity accurately on Line 9a so the record reflects a single-member disregarded entity from the outset.

The Reason for Applying and the Other Short Lines

Line 10 asks why the EIN is being requested, and for a new Delaware LLC the natural answer is that the applicant started a new business. The form provides a checkbox for exactly that, and selecting it with a brief description of the activity, such as online retail or software consulting, is sufficient. Founders sometimes overthink this line and try to describe their entire business plan. A short, truthful phrase is all the IRS expects, and excess detail does not speed anything up.

Several other lines are short but still matter. Line 1 carries the LLC legal name and must match the Certificate of Formation character for character, including the LLC designator. The mailing address lines should be an address where the founder can reliably receive mail, because the EIN confirmation letter, known as the CP 575, is sent there. Many non-residents use a US mailing address provided by their formation service or a virtual mailbox so the IRS correspondence does not have to cross borders. The date the business started and the closing month of the accounting year round out the basic profile, with most founders selecting December as the closing month to keep things on a calendar year.

Line 18 asks whether the applicant has ever applied for an EIN before for this or another entity. For a first company the answer is no. The signature block at the bottom is not optional. A faxed Form SS-4 without a signature is treated as incomplete and is set aside without a number being issued, which is one of the quieter ways a DIY application stalls for weeks while the founder waits for a reply that is never coming.

How the Fax Path Works Step by Step

The mechanics of the fax route are simple once understood but unfamiliar to founders who have never sent a fax. The completed and signed Form SS-4 is transmitted to the dedicated fax number the IRS maintains for international EIN applicants, meaning applicants whose responsible party has no SSN or ITIN. There is no fee for this. The EIN itself is free, and any service that bundles EIN retrieval into its package is charging for the labor and the assurance of correct preparation, not for the number, which the IRS never sells.

After the fax is received, the IRS international unit processes the request and faxes back a notice containing the assigned EIN. In a clean case this return can come within a day or two of receipt, but the realistic end-to-end window from submission to a usable number is about 8 to 10 business days once queue time, peak-season backlog, and the founder's own preparation are accounted for. Founders who need the number urgently should plan for the longer end of that range rather than the optimistic minimum, because the IRS does not guarantee turnaround and peak periods can stretch it.

The return fax provides the EIN immediately, but the official CP 575 confirmation letter, which banks often want to see, is mailed separately and can take additional weeks to arrive at the listed address. Some banks accept the faxed EIN notice or an EIN verification letter known as 147C obtained later, while others insist on the CP 575. Knowing which document a chosen bank requires before applying saves a second round of waiting, and keeping a clean digital copy of whatever the IRS sends back is worth doing the moment it arrives.

A Worked Example for a Solo Founder

Consider a founder in Pakistan who sells digital templates online and forms a single-member Delaware LLC to accept payments through a US account. The sequence runs as follows. The Certificate of Formation is filed for $110 and comes back stamped with the exact legal name, say Aurora Digital Goods LLC. The founder then prepares Form SS-4 with Aurora Digital Goods LLC on Line 1, copied letter for letter. On Line 7a the founder writes their full passport name, and on Line 7b the single word Foreign. The LLC box is checked on Line 8a with one member indicated, and Line 9a is completed as Other with the description foreign-owned single-member LLC.

Line 10 is marked as started new business with the activity described as online sale of digital products. The mailing address is the founder's US virtual address. December is selected as the closing accounting month. The founder signs Line 18 personally, dates it, and faxes the form to the IRS international EIN unit. Roughly a week and a half later, a return fax arrives carrying the nine-digit EIN. The founder saves the image, then uses it to open a Mercury or Wise account in the entity name.

The total cash spent so far on the federal identity itself is zero, because the EIN is free. The costs the founder actually incurred were the $110 state filing and whatever the founder chose to pay a service to prepare and transmit the paperwork correctly. From this point the founder has a recognized entity, a bank account, and a tax identity, and the next obligations on the horizon are the annual $300 Delaware franchise tax due June 1 and the federal Form 5472 information return.

How the EIN Connects to Business Banking

The most immediate reason a non-resident founder rushes the EIN is banking. US-facing fintech banks and platforms will not open a business account for an LLC that lacks an EIN, because the number is how they report and verify the entity. Mercury, Wise, Relay, Lili, and Payoneer each ask for the EIN during onboarding, alongside the Certificate of Formation and the founder's passport. The EIN is the thread that ties the legal entity, the banking relationship, and the eventual tax filings together, and applications stall without it.

Each platform has its own appetite for non-resident-owned entities, and the EIN does not by itself guarantee approval. A bank still runs its own checks on the founder's country of residence, the nature of the business, and the supporting documents. What the EIN does is remove a hard blocker. With it, the founder can attempt the application. Without it, there is nothing to attempt. This is why founders are advised to secure the EIN before booking time to set up banking rather than trying to do both in parallel and hitting a wall.

It is also why the name on Form SS-4 matters so much. The bank compares the entity name on the EIN record, the entity name on the Certificate of Formation, and the founder's identity documents. When all three align, onboarding tends to move smoothly. When the SS-4 introduced a spelling variation or listed the wrong responsible party, the bank may flag the application for manual review, and resolving that can take longer than the original EIN wait. Accuracy at the SS-4 stage pays off two steps later at the bank.

How the EIN Connects to the Annual Tax Obligations

Obtaining the EIN through Form SS-4 quietly enrolls the entity in a set of annual responsibilities that many founders do not anticipate. The most consequential for a foreign-owned single-member LLC is Form 5472, filed together with a pro forma Form 1120, which reports reportable transactions between the LLC and its foreign owner. This filing is required even in a year with no profit and even in a year with no transactions beyond the founder funding the company, as long as the entity exists. The penalty for failing to file is $25,000, which is why the obligation deserves attention from the first day the EIN exists.

The EIN is the identifier that ties those filings to the entity. When the founder later files Form 5472, the EIN obtained via SS-4 goes at the top of the pro forma 1120. The IRS uses it to match the return to the entity it created when it issued the number. This is the practical link between a short identity request and a real annual compliance duty. The SS-4 does not mention Form 5472 anywhere, which is exactly why so many founders are caught unaware, and a careful formation process flags the 5472 duty at the same time it delivers the EIN.

Separately, the EIN has nothing to do with the Delaware franchise tax, which is a state obligation. The $300 flat franchise tax is due June 1 each year regardless of whether the LLC earned anything and regardless of the EIN. Founders should keep the two streams distinct in their minds. The EIN governs the federal identity and federal information filings. The franchise tax is a flat state fee paid to Delaware. Confusing the two leads either to a missed federal filing or a missed state payment, and both carry consequences.

BOI Reporting and Why It No Longer Applies Here

Founders researching US LLC compliance in earlier periods will encounter heavy discussion of Beneficial Ownership Information reporting under the Corporate Transparency Act, which required entities to disclose their beneficial owners to the Financial Crimes Enforcement Network. For a stretch this was treated as a near-universal obligation for newly formed LLCs, and a great deal of older guidance still presents it that way. That guidance is out of date for US-formed companies.

Under the FinCEN Interim Final Rule of March 26 2025, domestic entities formed in the United States are exempt from the BOI reporting requirement. A Delaware LLC formed by a non-resident is a US-formed entity, so this exemption applies to it. The obligation that older articles describe in detail does not attach to a domestic Delaware LLC under the current rule. Founders should be careful not to act on stale instructions that tell them to file a BOI report with FinCEN for their US LLC, because the framework changed.

This connects to Form SS-4 only indirectly. The EIN is still required for banking and tax, and obtaining it through the SS-4 path is unchanged by the BOI development. What changed is one downstream compliance item that founders used to expect after formation. Mentioning it here matters because founders often bundle EIN, BOI, and Form 5472 together in their heads as a single post-formation checklist, and it is worth separating them. The EIN you still need, the Form 5472 you still file, and the BOI report you no longer file for a US-formed LLC under the March 2025 rule. None of this is legal or tax advice, and a founder with an unusual structure should confirm their own facts.

Common Misunderstandings That Cost Founders Time

A frequent misunderstanding is that the EIN costs money. It does not. The IRS issues EINs at no charge, and the responsible thing for any service to do is be clear that its fee covers preparation and handling rather than the number itself. Founders who believe the EIN is a paid government product sometimes fall for inflated offers or third-party sites that imply they are an official channel. The only issuer is the IRS, and the form that requests it is free to file.

Another misunderstanding is that the EIN makes the founder personally a US taxpayer or creates a US presence. It does neither on its own. The EIN identifies the entity, not the person, and whether the founder owes US tax depends on the nature and source of the income, the founder's own residency, and applicable treaties, which are separate questions entirely. Treating the EIN as a tax event causes needless worry. It is closer to a business registration number than to a tax bill.

A third misunderstanding is timing. Founders sometimes expect the same-minute issuance that the online tool advertises, then panic when their faxed SS-4 takes the better part of two weeks. The fax path is inherently slower because it involves a human queue at the IRS international unit. Planning around the realistic 8 to 10 business day window, rather than the instant online experience they read about, keeps expectations grounded and prevents founders from re-submitting duplicate applications that only create confusion in the IRS records.

Edge Cases That Change the Standard Path

Several situations push a founder off the standard single-member fax path. The first is a multi-member LLC. When two or more owners hold the entity, it is treated as a partnership by default, Line 9a is completed as Partnership rather than Other, and the annual filing becomes Form 1065 instead of the pro forma 1120 with Form 5472. The responsible party question also becomes more involved because the IRS still wants one individual with ultimate control named on Line 7a even though multiple owners exist. Founders moving from a solo plan to a partner structure should revisit the SS-4 fields rather than copying a single-member template.

A second edge case is a founder who already holds an ITIN. That founder may be able to use the online EIN tool, which sidesteps the fax wait entirely. The ITIN goes in the responsible party field instead of the word Foreign, and the number issues immediately. This is the rare instance where a non-resident gets the fast path, and it is worth checking whether an existing ITIN qualifies before defaulting to fax. A founder who plans to obtain an ITIN anyway might sequence that step first if speed on the EIN matters.

A third edge case involves a founder who is a US person despite living abroad, such as a citizen or green card holder overseas. Such a person has an SSN and is not a non-resident for this purpose, so the standard online route is open and the Foreign instruction does not apply. The label non-resident in this context is about tax and identification status, not merely about physical location, and conflating the two leads founders to take a slower path than they need or, conversely, to assume an online application will work when their identification status does not support it.

Related Terms That Frame Form SS-4 Correctly

Understanding Form SS-4 is easier when it is placed beside the terms it touches. The EIN is the output of the form, the nine-digit federal identifier the entity carries for its whole life. The Certificate of Formation is the input that must match Line 1, the $110 Delaware document that legally creates the LLC. The disregarded entity concept explains the default federal treatment of a single-member LLC and drives the correct Line 9a entry. Each of these is a distinct idea, and the SS-4 is the hinge connecting the state-level formation to the federal-level identity.

Downstream, Form 5472 is the annual information return that the EIN-bearing disregarded entity files with a pro forma Form 1120, carrying the $25,000 non-filing penalty that makes it the most important post-formation duty to remember. The Delaware franchise tax, a flat $300 due June 1, runs on a separate state track and is unrelated to the EIN. The ITIN appears as the alternative identifier that, when a founder holds one, can unlock the faster online EIN route. Holding these terms together turns a confusing checklist into an ordered sequence.

Framing the SS-4 this way also clarifies what it is not. It is not a tax return, not a bank application, and not a beneficial ownership report. It is an identity request that other steps depend on. A founder who keeps that boundary clear avoids the common trap of expecting the SS-4 to accomplish things it never does, and instead treats it as the precise, narrow step it is. As always, this is general information rather than legal or tax advice, and a founder facing an unusual fact pattern should confirm specifics against current IRS instructions or a qualified adviser.

Related terms

Related glossary terms & guides

Form your LLC WhatsApp

WhatsApp Form your LLC