Business License Requirements in Illinois

State-Level vs. Local Licensing Authority

Illinois does not require a single statewide general business license. Instead, you must navigate multiple licensing authorities depending on your business type and location. The state splits licensing responsibility between state agencies and local jurisdictions, each handling different regulatory areas.

State-Level Licensing Authority

The Illinois Department of Revenue, Illinois Department of Financial and Professional Regulation (IDFPR), and Illinois.gov registrations portal handle state-level licensing. You must register with the Department of Revenue for tax purposes before making sales or hiring employees, but this registration is separate from a general business license.

Illinois Department of Revenue manages business tax registration through MyTax Illinois or Form REG-1. Registration is free and required if you will make taxable sales or hire employees. You can complete registration online at https://tax.illinois.gov/questionsandanswers/286 without paying a registration fee.

Illinois Department of Financial and Professional Regulation issues licenses for regulated professions. If your business provides professional services requiring IDFPR licensure—such as accounting, law, medicine, or real estate—you must obtain a professional license or, if operating as an LLC, a Professional Limited Liability Company (PLLC) certificate of registration through https://idfpr.illinois.gov/profs/pllc.html.

Illinois.gov registrations, licenses, and permits portal at https://www.illinois.gov/business/registration-licenses-permits.html directs you to agency-specific permits. This portal consolidates links to state permits for health, liquor, environmental compliance, and other regulated activities.

Local Licensing Authority

County and city licensing offices issue local business licenses, zoning approvals, and permits. You must contact your city or county clerk to determine local requirements, as these vary significantly by jurisdiction.

Local licensing typically covers general business operation permits, zoning compliance, signage approval, and local tax registration. Some municipalities require a local business license even though Illinois has no statewide equivalent. Contact your city or county clerk's office directly to confirm what local licenses or permits apply to your business location and type.

Common Licenses You May Need

Illinois business tax registration through MyTax Illinois is mandatory if you make taxable sales or hire employees. This is a state-level requirement with no fee.

Local business license or zoning approval depends on your city or county. Check with your local clerk before opening.

Professional or occupational licenses are required by IDFPR for regulated professions. Examples include real estate, accounting, law, medicine, nursing, and cosmetology.

Health permits are issued by your local health department if you operate a food service, childcare, or other health-regulated business.

Liquor licenses are issued by your local municipality and the Illinois Liquor Control Commission if you sell alcohol.

Sales tax certificate of registration is obtained through the Department of Revenue at https://tax.illinois.gov/ and is required before you make taxable sales.

Action Steps

Register with the Illinois Department of Revenue at https://tax.illinois.gov/questionsandanswers/286 if you will make sales or hire employees. Use MyTax Illinois for online registration.
Determine if your profession requires IDFPR licensing. Visit https://idfpr.illinois.gov/ to confirm whether your business type needs a state professional license or PLLC certificate.
Contact your city or county clerk to identify local business license, zoning, and permit requirements. Requirements vary by municipality.
Check the Illinois.gov registrations portal at https://www.illinois.gov/business/registration-licenses-permits.html for any agency-specific permits your business may need (health, liquor, environmental, etc.).
Apply for industry-specific licenses (health, liquor, etc.) through the appropriate local or state agency once you confirm your business requires them.

Illinois separates state tax registration from local licensing, so you must contact both state agencies and your local government to ensure full compliance.

How to Register for Illinois Business Tax Registration

Illinois does not require a single statewide general business license. Instead, you must register separately for state tax purposes through the Illinois Department of Revenue if you plan to make taxable sales or hire employees. Registration is free and takes about 10 days to complete online.

Register Through MyTax Illinois or Form REG-1

You can register for Illinois business tax registration through two methods: the online MyTax Illinois portal or by submitting Form REG-1 to the Illinois Department of Revenue. Both options are free—there is no registration fee for standard Illinois business tax registration. Most businesses complete registration online through MyTax Illinois, which is faster and more convenient than paper filing.

Visit the Illinois Department of Revenue at https://tax.illinois.gov/ to access MyTax Illinois or download Form REG-1. You can also find detailed registration guidance at https://tax.illinois.gov/questionsandanswers/286 and https://tax.illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-use-tax/registering-your-business.html.

When You Must Register

You must register before you make your first taxable sale or hire your first employee. Illinois imposes a state general merchandise sales tax of 6.25% (before local add-ons), so any business selling taxable goods or services needs registration. Registering early protects you from penalties and ensures you collect and remit sales tax correctly from day one.

If you operate as a pass-through entity (partnership, S corporation, or single-member LLC taxed as a sole proprietorship), you still need business tax registration even if you don't owe Illinois income tax at the entity level. Your owners will owe individual Illinois income tax at 4.95%, and partnerships and S corporations owe a 1.5% replacement tax on Illinois-taxable income.

What Information You'll Need

Prepare the following before registering:

Your business name and legal structure (LLC, corporation, partnership, sole proprietorship)
Principal place of business address in Illinois
Expected monthly sales or payroll figures
Federal Employer Identification Number (EIN) or Social Security Number
Description of your business activities
Start date

Have this information ready whether you register online or by mail. Online registration through MyTax Illinois typically completes faster than paper Form REG-1 submission.

Sales Tax Certificate of Registration

Once you complete business tax registration, the Illinois Department of Revenue will issue you a Sales Tax Certificate of Registration. This certificate authorizes you to collect sales tax from customers. Keep it accessible at your place of business—you may need to show it to suppliers, customers, or during tax audits.

Your certificate number will appear on your registration confirmation. Use this number on all sales tax returns and correspondence with the Department of Revenue.

Professional Services and Additional Licensing

If your business provides professional services requiring Illinois Department of Financial and Professional Regulation (IDFPR) licensure—such as law, accounting, medicine, or engineering—you may need a Professional Limited Liability Company (PLLC) certificate of registration in addition to business tax registration. Visit https://idfpr.illinois.gov/profs/pllc.html to determine whether your profession requires PLLC registration.

Certain businesses also need local licenses, health permits, liquor licenses, or zoning approval from your city or county. Check https://www.illinois.gov/business/registration-licenses-permits.html for agency-specific permits required in your industry.

Estimated Tax Payments

Once registered, you must make estimated tax payments if you expect to owe Illinois income tax. Estimated payments are due on April 15, June 15, September 15, and January 15 each year. Sole proprietors and pass-through entity owners pay estimated tax based on their individual income; C corporations pay estimated corporate income tax at 7% plus replacement tax.

Consult a tax professional or the Illinois Department of Revenue to determine your estimated payment obligations based on your business structure and expected income.

Contact the Illinois Department of Revenue

For registration questions, contact the Illinois Department of Revenue:

Website: https://tax.illinois.gov/
Business Registration Q&A: https://tax.illinois.gov/questionsandanswers/286
Sales Tax Overview: https://tax.illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-use-tax/registering-your-business.html

The Department of Revenue handles all state-level business tax registration and sales tax matters. If you need help with local licensing, contact your city or county clerk's office.

Sales Tax Registration and Certificate of Registration

You must register for Illinois sales tax before making taxable sales or hiring employees. The Illinois Department of Revenue (IDOR) requires all businesses that will engage in taxable retail sales to complete registration. There is no registration fee for standard Illinois business tax registration.

How to Register for Sales Tax

You can register through MyTax Illinois or by submitting Form REG-1 to the Illinois Department of Revenue. Both methods are available online at the IDOR website. Registration typically takes about 10 business days for standard processing.

Visit the business registration Q&A at https://tax.illinois.gov/questionsandanswers/286 for step-by-step guidance specific to your business type.

Illinois Sales Tax Rate

Illinois imposes a 6.25% general merchandise state sales tax rate before local taxes and special district add-ons. Your actual sales tax obligation will be higher if your business location is in a municipality or special district that adds local sales tax on top of the state rate.

Check the IDOR's retailers overview at https://tax.illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-use-tax/registering-your-business.html to calculate your total combined rate.

Certificate of Registration

Once you complete sales tax registration with IDOR, you receive a Certificate of Registration (also called a sales tax permit). This certificate authorizes you to collect sales tax from customers on taxable transactions.

You must display your Certificate of Registration at your place of business. Keep it available for inspection by IDOR auditors and local tax officials.

When to Register

Register before you make your first taxable sale or hire your first employee. Registering early prevents penalties and ensures you have the proper documentation in place from day one of operations.

If you are forming an LLC or corporation, you can complete sales tax registration as part of your overall business startup process after filing your formation documents with the Illinois Secretary of State.

Contact IDOR for Registration Help

The Illinois Department of Revenue handles all sales tax registration questions and applications. You can reach them at https://tax.illinois.gov/ or call for assistance with your specific registration needs.

For businesses with complex sales tax situations (multistate sales, specific product categories, or use-tax questions), IDOR's business registration team can provide guidance tailored to your operations.

Business Tax Registration Fees

Illinois imposes no registration fee for standard business tax registration. You register through MyTax Illinois or Form REG-1 with the Illinois Department of Revenue before making taxable sales or hiring employees. Registration is free whether you operate as an LLC, corporation, partnership, or sole proprietorship.

Registration Requirements and Process

You must register for Illinois business tax if you will make taxable sales or hire employees in the state. Registration is mandatory before you begin those activities. The Illinois Department of Revenue handles all business tax registration centrally—there is no separate statewide general business license requirement.

You can complete registration online through MyTax Illinois or by submitting Form REG-1 to the Illinois Department of Revenue. The process takes about 10 business days for standard processing. Registration covers both sales tax and business tax obligations.

What Registration Covers

Illinois business tax registration gives you a sales tax certificate of registration and establishes your tax account with the state. You use this registration to collect and remit the 6.25% state general merchandise sales tax (before any local add-ons). The certificate also registers you for Illinois income tax withholding if you hire employees.

Registration does not cover professional licenses, health permits, liquor licenses, or local business licenses. Those require separate filings with the Illinois Department of Financial and Professional Regulation, local health departments, or your city or county clerk.

Assumed Name Fees

If you operate under an assumed name (DBA), you'll pay a separate fee to the Secretary of State. For 2026, Illinois LLC assumed-name adoption costs $120 for filings in years ending in 1 or 6. Sole proprietors file assumed names at the county level, not with the state.

Contact Information

Reach the Illinois Department of Revenue at:

Website: https://tax.illinois.gov/
Business registration Q&A: https://tax.illinois.gov/questionsandanswers/286
Registration overview: https://tax.illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-use-tax/registering-your-business.html

The Illinois Secretary of State's Limited Liability Division can answer questions about entity formation but does not handle tax registration. Call (217) 524-8008 for LLC or corporation filing questions.

Common License Types in Illinois

Illinois does not require a single statewide general business license. Instead, you'll navigate multiple licensing pathways depending on your business type and activities. The Illinois Department of Revenue, Illinois Department of Financial and Professional Regulation, local city or county offices, and the Illinois.gov registrations and permits portal each handle different license categories.

Business Tax Registration

You must register with the Illinois Department of Revenue before making taxable sales or hiring employees. Registration through MyTax Illinois or Form REG-1 is free and takes about 10 days. This registration is separate from any local business license and covers your state tax obligations.

Key details:

No registration fee
Required before you hire or make sales
Completed online at MyTax Illinois or by mail
Contact: Illinois Department of Revenue at https://tax.illinois.gov/

Local Business License or Zoning Approval

Your city or county clerk issues local business licenses and zoning permits. Requirements vary significantly by municipality—some require formal licenses while others rely on zoning compliance alone. You'll contact your specific city or county licensing office to determine what's required for your location and business type.