Illinois Sales Tax Registration — 2026
Learn when and how to register for sales tax permits including state thresholds and economic nexus rules.
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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%
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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
When do I need to collect sales tax in Illinois?
You need to collect sales tax if you have a physical presence (office, warehouse, employees) OR exceed the economic nexus threshold (typically $100K in sales or 200 transactions) in Illinois.
How do I register for a sales tax permit in Illinois?
Register through the Illinois Department of Revenue website. The permit is typically free but may require a bond. You'll receive a filing frequency based on sales volume.
Disclaimer:This calculator provides estimates for informational purposes only. It does not constitute tax advice, financial advice, or legal advice. Tax laws change frequently and vary by individual circumstances. Results may not reflect your actual tax liability. Always consult a qualified CPA, tax professional, or financial advisor before making tax decisions. For official tax information, visit IRS.gov.