How to Get an EIN for Your Solo Founder Business in Idaho (2026)

Starting a business solo in Idaho is an exciting venture! As a solo founder, obtaining an Employer Identification Number (EIN) is a crucial step for your single-member LLC. This guide simplifies the process for 2026, ensuring you're compliant and ready to grow your business.

What is an EIN?

An Employer Identification Number (EIN) is essentially a Social Security number for your business. Issued by the IRS, it's a unique nine-digit number that identifies your business for tax purposes. Even as a solo founder, especially with an LLC, an EIN is often necessary.

How to Apply for an EIN

  1. Determine Eligibility: Ensure your Idaho single-member LLC requires an EIN. Most LLCs operating a business need one, especially if you plan to hire, open a business bank account, or elect to be taxed as an S-Corp.
  2. Choose Your Business Structure: Confirm your business structure is legally registered as an LLC in Idaho. The EIN application requires you to specify your business type.
  3. Complete the SS-4 Form: The application for an EIN is IRS Form SS-4. You can download it from the IRS website or complete the application online.
  4. Apply Online (Recommended): The IRS offers an online EIN application portal. It's the fastest and easiest way to obtain your EIN. The online application is available Monday through Friday.
  5. Submit Your Application: If applying online, simply submit the completed form electronically. If using the paper form, you can fax or mail it to the IRS (though online is much faster).
  6. Receive Your EIN: If you apply online, you'll typically receive your EIN immediately. If you mail or fax the form, it can take several weeks.

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