How Do I Get an EIN for My Illinois LLC?

Apply directly with the IRS using Form SS-4 at irs.gov/ein, by phone at 1-800-829-4933, by fax, or by mail. The IRS issues EINs immediately when you apply online at no cost. Your EIN is separate from Illinois LLC formation—you don't need an EIN to file Articles of Organization with the Illinois Secretary of State (805 ILCS 180/5-5), but you'll need one to hire employees, open a business bank account, or file federal taxes.

When You Need an EIN

An EIN is required if your LLC will hire employees, operate as a multi-member LLC (taxed as a partnership by default), open a business bank account in the LLC's name, or file federal income tax returns. Single-member LLCs taxed as sole proprietorships may use the owner's Social Security Number, but an EIN is still recommended for liability protection and professional banking.

Formation vs. EIN: Two Separate Steps

Illinois LLC Formation

File Articles of Organization with the Illinois Secretary of State at https://apps.ilsos.gov/llcarticles/index.jsp. The $150 filing fee covers standard processing in approximately 10 business days (805 ILCS 180/5-5). Your articles must include your LLC name with the required designator (LLC, Limited Liability Company, or L.L.C.), principal place of business address, registered agent information, and organizer details.

Obtaining Your EIN

After your Illinois LLC is approved, apply for an EIN with the IRS—not through Illinois. The IRS issues EINs free of charge. Online applications receive immediate confirmation. You'll need your LLC's legal name, principal business address, formation date, and your Social Security Number or ITIN.

How to Apply

Online (Fastest)

Visit irs.gov/ein and complete Form SS-4. You'll receive your EIN immediately upon submission.

By Phone

Call 1-800-829-4933 (Mon–Fri, 7am–10pm ET). Have your LLC formation documents ready.

By Mail or Fax

Mail or fax Form SS-4 to your regional IRS office. Processing takes approximately 4 weeks.

Next Steps

1. Complete Illinois LLC formation through the Secretary of State
2. Obtain your filing confirmation number
3. Apply for an EIN through the IRS using Form SS-4
4. Receive your EIN (immediately online or within 4 weeks by mail)
5. Update your LLC records with the EIN for tax and banking purposes

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This is general information, not legal advice.