Getting an EIN With No Social Security Number
The IRS's own online EIN application is the fastest way to get a federal tax number, and it is closed to most foreign owners before they type a single field, because the tool requires the responsible party to already hold a Social Security Number or an Individual Taxpayer Identification Number. That single gate is the reason an entire industry exists to file Form SS-4 by hand on behalf of applicants who do not have one. This walks through what the gate actually does, the routes that remain open, and where those submissions most often go wrong.
Why the online tool is unavailable
The IRS's internet EIN application (the "EIN Assistant") is built around identity-proofing the responsible party in real time, and its underlying design requires a U.S. taxpayer identification number for that person as a prerequisite to using it. This is a system design choice, not a rule published in a regulation, and the IRS states it plainly on its own EIN application page: applicants without a legal residence, principal place of business, or principal office or agency in the United States cannot use the online application. A foreign individual serving as responsible party for a U.S. entity, with no SSN or ITIN, falls into that category regardless of how straightforward the rest of the application would otherwise be.
This is a frequent point of confusion because nothing in the underlying statute or in Treas. Reg. §301.6109-1, which governs employer identification numbers generally, bars a person without a U.S. taxpayer identification number from being a responsible party. The restriction sits entirely in the online tool's own access design, which is why paper-based routes that predate the online tool remain fully valid.
The routes that remain
Form SS-4 itself has not gone anywhere, and the instructions that accompany it lay out three channels other than the online tool. An applicant can fax the completed form; as of the current instructions, the fax number for applicants with no legal residence, principal office, or principal agency in the United States differs from the domestic fax number, and processing by fax generally returns an EIN within about a week when a return fax number is provided. An applicant can mail the completed form to the IRS's EIN Operation address in Cincinnati, Ohio, which is slower and typically takes several weeks. And an international applicant, or a third-party designee acting on the applicant's behalf, can call the IRS's dedicated international EIN telephone line during its published hours, answer the SS-4 questions verbally, and receive the EIN by the end of that call, which makes the phone route the fastest of the three non-online channels when it is available to the caller.
| Channel | Who can use it | Typical turnaround | What you receive |
|---|---|---|---|
| Online EIN Assistant | Responsible party with a U.S. SSN or ITIN | Immediate | EIN confirmation (CP 575) issued instantly |
| Fax | Any applicant, including foreign responsible parties | Roughly one week with a return fax number provided | EIN confirmation faxed back, followed by CP 575 by mail |
| Any applicant | Several weeks, sometimes longer | CP 575 by mail | |
| International telephone line | International applicants or their authorized designee, during published hours | Same call | EIN provided verbally; written confirmation follows by mail |
A third-party designee, meaning a person the applicant authorizes on the SS-4 form itself to receive the EIN and answer IRS questions about the application, can use the fax or phone route on the applicant's behalf. That authorization is limited to what Form SS-4 grants it. It is not a general power of attorney, and it expires once the EIN is assigned.
The responsible party field, and why it must be a natural person
Form SS-4 asks for the name and taxpayer identification number of the entity's "responsible party." The IRS defines that role, consistent with Treas. Reg. §301.6109-1(a)(1)(ii), as the person who has a level of control over, or entitlement to, the funds or assets of the entity that, as a practical matter, permits that individual to control, manage, or direct the entity and the disposition of its funds and assets. Since the IRS tightened its instructions on this point, the responsible party must be a natural person, not another entity, unless the applicant itself is a government body. This closed off a practice some formation services used, where an entity or a nominee company was listed as its own responsible party.
Where the responsible party has no U.S. taxpayer identification number, current SS-4 practice is to enter "FOREIGN" in the field that asks for the SSN or ITIN rather than leaving it blank or entering a foreign identification number, which is not a valid entry in a field the IRS's system expects to hold a specific U.S. number format. A blank field is one of the most common reasons a paper SS-4 is returned unprocessed rather than rejected outright, because the IRS's intake process treats an incomplete required field as a reason to send the form back rather than resolve the ambiguity itself.
Common rejection and delay causes
Beyond a blank responsible party identification field, a handful of recurring issues account for most of the delay in this process. The entity name and address on the SS-4 must match the state formation documents exactly, including punctuation and suffix (LLC versus L.L.C., for example); a mismatch triggers manual review. The line asking for the reason the EIN is being requested must correspond to an accepted category, such as "started a new business," and a vague or missing answer slows processing. The form must be signed by the responsible party or by an authorized officer, not merely typed, and an unsigned fax or mailed submission is treated as incomplete. And where a third-party designee is used, the designee section (line 18 in the current form layout) must be completed correctly with the designee's own contact information, because an incomplete designee section can prevent the IRS from releasing the EIN to anyone other than the applicant directly, defeating the purpose of using a designee at all.
The formation-mill trap
A category of low-cost formation services files the SS-4 as part of a package and, in a meaningful number of cases, lists an employee or principal of the formation company itself as the responsible party, either to speed up the filing or because the service does not collect enough information from the actual owner to complete the field correctly. This creates a problem that surfaces later rather than at formation. The person named as responsible party is the individual the IRS's records associate with control over the entity's funds and, practically speaking, the person the IRS contacts first about that entity's account, including for the notices that begin the Form 5472 penalty process under IRC §6038A(d). Where that person is a stranger to the actual foreign owner, correspondence can be missed, delayed, or simply never forwarded, and correcting the responsible party after the fact requires either a new SS-4-based update or written correspondence with the IRS rather than a self-service change on a portal. Reviewing exactly who is listed as responsible party on any EIN obtained through a third-party formation service is one of the more consequential five-minute checks an owner can perform.
Correcting a responsible party after the fact
Where the wrong person ends up listed as responsible party, whether because a formation service filled in its own contact or because the actual owner changed after formation, the fix is not a phone call or a portal edit. The IRS requires notice of a change in responsible party to be made on Form 8822-B, Change of Address or Responsible Party, Business, filed within 60 days of the change. The instructions to Form 8822-B specifically note that any entity with an EIN must file it whenever the identity of its responsible party changes, a requirement that applies even to entities that had the wrong person listed from the start, since correcting that error is treated the same as reporting a change. Skipping this step leaves the IRS's records, and therefore the party the IRS will first attempt to contact about the entity's compliance, out of step with who actually controls it, which becomes a live problem the moment a notice is issued and needs a response within a fixed number of days.
If a submission is rejected outright
A rejected SS-4, as opposed to one that is simply delayed, is usually rejected for one of a small number of reasons: the entity name does not match an available state formation record, the form is missing a required signature, or the stated reason for applying does not match the entity type described elsewhere on the form, such as selecting "banking purpose" without naming the specific reason required in that section. The IRS's practice is generally to return the form with the deficiency noted rather than to explain by phone what went wrong, which means a rejected fax or mailed submission often just appears to have gone nowhere unless the applicant is watching for a returned response. Building in a follow-up check, roughly two weeks after a fax submission and four to six weeks after a mailed one, catches a silent rejection before it becomes a silent multi-month delay.
The timing dependency: banking and the Form 5472 cycle
The EIN is not the end of the sequence; it is the input the rest of the sequence depends on. A bank cannot open an account without a valid EIN confirmation to record under the Customer Identification Program rule at 31 CFR §1020.220, so any delay in obtaining the EIN through fax or mail pushes the entire banking timeline back by the same number of weeks. And the EIN's issuance date effectively anchors the entity's first tax year for purposes of the Form 5472 filing obligation that attaches to a foreign-owned disregarded entity or corporation under IRC §6038A and Treas. Reg. §301.7701-2(c)(2)(vi): the first reportable year typically runs from formation (or from the point foreign ownership attaches) through the entity's chosen year end, and the first Form 5472, filed as an attachment to a pro forma Form 1120, becomes due on that basis regardless of whether the entity has yet opened a bank account or generated revenue. An owner who assumes the compliance clock starts when the business "actually begins" rather than when the entity and its EIN come into existence is the most common source of a late first-year Form 5472 filing.
Planning the sequence rather than reacting to it
The applicants who move through this process fastest are the ones who treat the EIN application as the first step in a planned sequence rather than as an isolated task to check off. That means deciding, before the SS-4 is submitted, who the responsible party will actually be, gathering that person's passport and contact information in advance, and choosing the submission channel, fax, mail, or the international phone line, based on realistic turnaround expectations rather than on whichever channel a formation package happens to default to. It also means lining up the bank or payment processor research described elsewhere in this practice's incorporation dossiers before the EIN arrives, so that the confirmation notice can be put to use immediately rather than sitting for weeks while the owner separately researches where to open an account. None of this shortens the IRS's own processing time. It does shorten the total time between deciding to form a U.S. entity and having a fully operational one, which is usually the timeline that actually matters to the owner.
This is general information about EIN application procedures as of the date written. Fax numbers, telephone hours, and processing times published by the IRS change periodically; confirm current routing details against the IRS's own Form SS-4 instructions before relying on them, and consult your tax adviser about who should be listed as responsible party for your specific structure.