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Guide · EIN and tax· 2 min read

How long an EIN takes without an SSN, by route, and what to do at thirty days

Realistic EIN timelines without an SSN: fax, phone and post, why the IRS's four-day figure rarely applies, and how to chase a quiet application.

Updated by the BaseAcross team. Reviewed by Saais Patel, compliance reviewer, against the sources named in the text.

The short answer

The IRS says that under its Fax-TIN program an EIN by fax generally comes within 4 business days. For a company owned from abroad, our estimate is six to eight weeks. The IRS's international phone line gives the number during the call, if you get through. Post takes about four weeks.

On this page · 4 sections
  1. 01By route
  2. 02The number and the letter arrive separately
  3. 03What slows it down
  4. 04What to do while you wait

By route

EIN timelines, October 2026
RouteThe IRS's figureNotes
OnlineImmediateNeeds the responsible party's SSN or ITIN
FaxAbout 4 business days with a return fax numberThe number is often assigned before the letter arrives
Phone, international lineDuring the callThe caller must be authorised to sign the form, or a designee named on it
PostAbout 4 weeksThe slowest route

With the expedited EIN, $199 on any plan, we use the direct route. Our estimate is two to three weeks. Only a successful call to the phone line is faster, and that line can be hard to reach.

The number and the letter arrive separately

The IRS assigns the EIN when it processes the form. The CP 575 letter confirming it is printed and posted afterwards to the mailing address on the form, and international post adds its own delay. On the fax route the IRS faxes the number back. On the phone route you get the number during the call and the letter follows. So a company can have a working EIN weeks before the letter arrives.

What slows it down

  • The spring filing season, from January to April, when IRS queues are longest.
  • US federal holidays, and the days around them.
  • A form with an error: a missing signature, a name that doesn't match the state's record, or a duplicate application.
  • A second application sent because the first seemed slow. It can produce a second number and months of letters to cancel it.

What to do while you wait

  • Sign the operating agreement, which doesn't need the EIN.
  • Prepare the bank application: passport scans, proof of address, a description of the business and a website.
  • Set up invoicing and bookkeeping, which can start without the number.

Sources

Checked by Saais Patel against these official pages.

  1. IRS: instructions for Form SS-4

Next in EIN and tax:CP 575 and 147C: the two letters that prove your EIN, and how to get the second one

05 · Questions

The questions this guide gets asked.

If yours is not here, email us at hello@baseacross.com before you order.

The IRS says that under its Fax-TIN program an EIN by fax generally comes within 4 business days. For a company owned from abroad, our estimate is six to eight weeks. The IRS's phone line for international applicants gives the number during the call, if you get through. With our expedited EIN, $199 on any plan, our estimate is two to three weeks.

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