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

Starting an accounting business in Illinois in 2026 requires careful planning, including obtaining an Employer Identification Number (EIN) from the IRS. This guide provides a step-by-step approach to securing an EIN for your CPA firm, bookkeeping service, or tax preparation business. Lovie's AI-powered formation platform can streamline this process, ensuring accuracy and compliance.

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 company for tax purposes. Whether you're forming a Professional Limited Liability Company (PLLC), a Professional Corporation (PC), or another entity type for your accounting practice, an EIN is generally required.

How to Apply for an EIN

  1. Determine Your Eligibility: Ensure your accounting business requires an EIN. Generally, if you're forming a corporation, partnership, or have employees, you'll need one.
  2. Choose Your Business Structure: Decide on your business structure (PLLC, PC, etc.). This impacts the EIN application process and your tax obligations in Illinois.
  3. Prepare Form SS-4: Download Form SS-4 from the IRS website (irs.gov) and complete it accurately. This form requests information about your business, including its name, address, and responsible party.
  4. Submit Your Application: You can apply for an EIN online through the IRS website, by fax, or by mail. Online applications are generally processed faster.
  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.
  6. Notify Illinois Agencies: After receiving your EIN, ensure you update your business registration with the Illinois Secretary of State and other relevant state agencies.

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