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

Starting an accounting business in Arizona in 2026 requires an Employer Identification Number (EIN) from the IRS. This guide provides a comprehensive overview of how to obtain an EIN for your accounting firm, whether you're forming a PLLC, PC, or other entity. Navigating the process can be complex, but with the right information, you can secure your EIN and start serving clients efficiently. Lovie streamlines this entire process, handling formation and EIN registration through AI, so you can focus on your clients.

What is an EIN?

An EIN, or Employer Identification Number, 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 your firm for tax purposes. Accounting businesses in Arizona, including CPA firms, bookkeeping services, and tax preparation companies, generally need an EIN to operate legally and manage their finances.

How to Apply for an EIN

  1. Determine Your Eligibility: Ensure your accounting business meets the IRS requirements for obtaining an EIN. Generally, any entity that is not a sole proprietorship without employees will need an EIN.
  2. Choose Your Responsible Party: Designate a 'responsible party' – the individual who controls, manages, or directs the entity and the disposition of its funds and assets. This person must have a valid Taxpayer Identification Number (SSN or ITIN).
  3. Complete the IRS Form SS-4: Fill out IRS Form SS-4, Application for Employer Identification Number. You can download the form from the IRS website or complete the application online.
  4. Submit Your Application: Submit Form SS-4 to the IRS. You can apply online through the IRS website, by fax, or by mail.
  5. Receive Your EIN: Upon approval, the IRS will issue your EIN. If you applied online, you'll receive it immediately. If you applied by fax or mail, it may take several weeks.
  6. Verify EIN Accuracy: Double-check the information on your EIN confirmation notice to ensure it's accurate. Contact the IRS immediately if you find any errors.

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