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NEW2026 tax rates and LLC fees updated for all 50 states.
Fact-checked by Financial ExpertsLast Updated: March 2026Illinois Department of Revenue

Illinois County Sales Tax Rates 2026

All 10 counties · State rate: 6.25% · Avg combined: 8.10%

Illinois Sales Tax Calculator

Total with Tax

$0.00

Highest Rate

10.25%

Cook County

Lowest Rate

7.25%

Lake County

Average Rate

8.10%

Across 10 counties

CountyCombined RateState RateLocal RatePopulation
Cook County10.25%6.25%4%5,150,000
DuPage County7.75%6.25%1.5%930,000
Lake County7.25%6.25%1%700,000
Will County8%6.25%1.75%700,000
Kane County7.75%6.25%1.5%520,000
McHenry County7.25%6.25%1%310,000
Winnebago County8%6.25%1.75%290,000
Madison County7.6%6.25%1.35%270,000
St. Clair County8.1%6.25%1.85%260,000
Champaign County9%6.25%2.75%210,000

Illinois City Tax Guides

Last Updated: March 2026. Consult a licensed tax professional.