Illinois Business Registration Cost — 2026

Find out exactly what it costs to register and maintain a business including state filing fees and annual requirements.

Quick Illinois Tax Estimate

Based on Illinois's tax rates for 2026. Enter your details for a personalized calculation.

State Tax on $80K Profit
$0
SE Tax
$11,303.64
Effective Rate
20.2%
Marginal Rate
12%
Full Illinois Tax Calculator →

Illinois Tax Information

State Income TaxYes
Sales Tax0%
LLC Filing Fee$0
Annual Report Fee$None
Standard DeductionN/A

Self-employed pay both federal and Illinois state tax.

Illinois Quarterly Tax Deadlines

Q1
Apr 15
Q2
Jun 16
Q3
Sep 15
Q4
Jan 15

Frequently Asked Questions

How much does it cost to register a business in Illinois?
LLC filing fees vary by state. Additional costs: registered agent ($50-300/year), business licenses, EIN (free), DBA registration if using a trade name. See the full breakdown above.
Do I need a business license in Illinois?
Most businesses need a general business license from the city/county. Professional licenses may be required for specific trades. Illinois has specific requirements — check the business registration page.
What are the annual fees for an LLC in Illinois?
Annual report/franchise tax fees vary significantly. Some states have zero annual fees, others charge $800+ (California). Failure to file can result in penalties or administrative dissolution.