IRS EIN Assistant: Hours, Limits, and Who It Rejects (2026)

How does the IRS EIN Assistant work?

The IRS EIN Assistant walks through the Form SS-4 questions on screen, then issues the EIN at the end of the session. The tool costs $0 and delivers the number immediately, with no waiting period.

The Assistant is the online version of Form SS-4. It asks the same questions in the same order: entity type, member count, responsible party, reason for applying, and principal activity. The difference is delivery, because the tool issues the number on screen instead of sending it weeks later.

The session runs start to finish in one sitting. The Assistant saves nothing between visits, so closing the browser discards every answer entered so far and the application restarts from the first screen.

The confirmation letter arrives the same way it always does. The tool offers the CP-575 as a download at the end of the session, and the IRS mails a copy to the address entered during the application.

What hours does the IRS EIN Assistant run?

The IRS EIN Assistant runs Monday to Friday, 7 a.m. to 10 p.m. Eastern. It stays closed on weekends and US federal holidays, and the session times out after 15 minutes of inactivity.

The hours catch applicants outside the United States hardest. An applicant in Dhaka reaching the tool at a convenient local hour finds it closed, because 7 a.m. Eastern is 5 p.m. in Bangladesh and 10 p.m. Eastern is 8 a.m. the following day.

The 15-minute timeout is the second trap. Stepping away to find a formation document ends the session, and the answers do not survive. Collect the legal name, formation date, member count, and responsible party details before opening the tool.

Weekend closure removes 2 days from every week. An applicant who finishes a state formation on a Friday evening waits until Monday morning Eastern time before the tool accepts anything.

Who does the IRS EIN Assistant reject?

The IRS EIN Assistant rejects applicants whose responsible party holds no SSN and no ITIN. The tool validates that number against IRS records, so an application with neither stops at the responsible-party screen.

This is a tool limitation, not an eligibility rule. The IRS issues EINs to responsible parties who hold no US tax ID, and Form SS-4 line 7b accepts the word Foreign for exactly that case. The online Assistant simply cannot process that entry.

The block appears late in the flow, after the entity questions are answered. Applicants read the screen as a rejection of the business rather than a limitation of the channel, and abandon an application the IRS would have approved on paper.

The paper route stays open and free. A faxed Form SS-4 costs $0 and reaches the same IRS system, which is why the honest answer for a blocked applicant is fax rather than a different online tool.

What are the alternatives when the Assistant blocks you?

Fax Form SS-4 to 855-641-6935 from a US-based entity, or 855-215-1627 from outside the United States. International applicants also reach the IRS by phone at 267-941-1099. Every route costs $0.

Fax is the standard route for applicants without an SSN. The form carries the word Foreign on line 7b, the IRS processes it through the same system the Assistant feeds, and the resulting EIN is identical in every respect.

The tradeoff is visibility. Fax provides no tracking number, no confirmation of receipt, and no status page, so an applicant waits without knowing whether the form arrived. That gap, rather than the filing itself, is what einnumber.co charges from $67 to close.

Mail works and takes longest, at 4 weeks. It suits applicants with no deadline and no fax access, and it carries the same $0 IRS fee as every other method.

What do you need before opening the IRS EIN Assistant?

Collect 6 items first: the exact legal name, the state formation date, the member count, the responsible party's name and tax ID, a mailing address, and a description of the principal activity.

Preparation is what beats the 15-minute timeout. Every item on that list appears on Form SS-4, and hunting for any one of them mid-session is what ends most failed attempts.

The legal name has to match the state record character for character. LLC and L.L.C. read as two different entities to the IRS, and a mismatch surfaces later as a rejected bank application rather than an error on screen.

The formation date is the date the state approved the entity, not the date the paperwork was signed or the filing fee was paid. It sits on the approval certificate the state returned.

Member count decides federal tax treatment for the life of the company. One member produces a disregarded entity, and 2 or more produces a partnership that files Form 1065 every year after.

What happens after the Assistant issues your EIN?

The tool offers the CP-575 confirmation letter as a download at the end of the session, and the IRS mails a copy. The EIN is active immediately for filing, and reaches other IRS systems within about 2 weeks.

Download the CP-575 before closing the browser. The IRS issues one CP-575 per EIN and never reprints it, so that download is the only clean copy that will ever exist. A replacement arrives later only as a 147C letter, on request.

Banks and payment platforms verify against that document. Mercury, Wise, Relay, Stripe, PayPal, and Amazon each check the legal name on the CP-575 against the formation document, which is where a name mismatch finally surfaces.

The number itself never expires. An EIN lasts the life of the entity, never renews, and costs $0 in year 2 and every year after. Applying a second time for the same entity creates two tax accounts rather than replacing the first.

Who should use the IRS EIN Assistant instead of paying anyone?

Anyone whose responsible party holds an SSN or ITIN should use the Assistant. It issues the same EIN, from the same IRS system, in 15 minutes, at $0. Paying a service in that situation buys nothing.

US residents forming a company are the clearest case. An SSN clears the responsible-party screen, the session finishes inside one sitting, and the EIN arrives before the browser closes. No filing service improves on that outcome.

ITIN holders clear the same screen. An ITIN is validated against IRS records exactly as an SSN is, so a non-resident who already obtained one uses the free tool like any US resident.

The honest boundary sits at line 7b. A responsible party with neither number cannot pass validation, and that single field is what separates the free 15-minute path from the paper one.

Say it plainly: have an SSN? irs.gov is free, and it is the right answer. The paid route exists for the applicants the tool turns away, and for no one else.

Why does the IRS EIN Assistant return an error?

Reference number 101 is the most common Assistant error, and it signals a name conflict in IRS records. Other sessions fail on the 15-minute timeout, on closed hours, or on a responsible party with no SSN or ITIN.

A 101 error points to one of two conditions: the legal name resembles an entity that already holds an EIN, or the state record and the entered name differ. The Assistant stops rather than guessing, and the application moves to paper for a human reviewer.

Timeouts produce no error message worth reading. The session simply ends, and the applicant returns to the first screen with every answer gone.

An error is not a verdict on the business. Every one of these paths ends at the same place: a Form SS-4, filed on paper, processed by the IRS at no charge.

How do the EIN application routes compare?

The Assistant is fastest at 15 minutes and requires an SSN or ITIN. Fax and mail accept everyone and take longer. Every IRS route charges $0.

Source: IRS, verified July 2026. Business days are Monday to Friday, excluding US federal holidays.

What else do people ask about the IRS EIN Assistant?

Blocked by the Assistant?

Have an SSN? Use irs.gov and keep your money, it takes 15 minutes. Without one, we prepare Form SS-4, enter Foreign on line 7b, and file by fax within 5 business days for $67, or within 24 hours for $97 with the IRS call included. You receive your EIN and the CP-575.

No SSN. No passport upload. · the EIN filing service, from $67