How to Get an EIN for Your Accounting Business in California (2026)

As an accounting professional in California, whether you're a CPA, bookkeeper, or tax preparer, obtaining an Employer Identification Number (EIN) is a crucial step in formalizing your business. This guide provides a comprehensive overview of how to get an EIN for your accounting business in California in 2026.

What is an EIN?

An Employer Identification Number (EIN) is a unique nine-digit number assigned by the IRS to business entities operating in the United States. It's essentially a Social Security number for your business, used to identify it for tax purposes.

How to Apply for an EIN

  1. Determine Your Eligibility: Ensure your California accounting business meets the IRS requirements for obtaining an EIN. Generally, any entity operating as a corporation, partnership, or employing others is eligible.
  2. Choose Your Responsible Party: Designate a "responsible party" – typically the owner, partner, or officer who will control, manage, and direct the entity and the disposition of its funds and assets. This person must have a valid Taxpayer Identification Number (SSN or ITIN).
  3. Complete Form SS-4: Fill out IRS Form SS-4, Application for Employer Identification Number. You'll need to provide information about your California accounting business, such as its legal name, address, business activity, and the reason for applying for the EIN.
  4. Submit Your Application: You can apply for an EIN online through the IRS website, by fax, or by mail. The online application is the fastest and most efficient method. As of 2026, online application is the most common method.
  5. Receive Your EIN: If you apply online, you'll typically receive your EIN immediately. If you apply by fax or mail, it may take several weeks. The IRS will send you a notice (Form CP 575) confirming your EIN.
  6. Safeguard Your EIN: Treat your EIN like a Social Security number. Keep it confidential and only share it with trusted parties, such as your bank, accountant, and the IRS.

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