Illinois Sales Tax Calculator
Estimate sales tax in Illinois at the average combined rate of 8.92%. Add tax to a price or back it out of a total.
Enter your combined state + local rate. U.S. sales tax rates vary by city and county.
Illinois sales tax rate
| State sales tax rate | 6.25% |
| Average local sales tax rate | 2.67% |
| Average combined rate | 8.92% |
Population-weighted averages as of July 1, 2025 (Tax Foundation). Your exact rate depends on your city and county.
How sales tax works in Illinois
Illinois charges a statewide rate of 6.25%. Counties and cities add their own rates on top, which is why the combined total varies by location. The 2.67% figure above is the population-weighted average. To add tax, multiply the price by the rate; to back it out of a tax-inclusive total, divide by 1 plus the rate.
Worked example
A $100 purchase at Illinois's average combined rate of 8.92% adds $8.92 in sales tax, for a $108.92 total.
Frequently asked questions
What is the sales tax rate in Illinois?
Illinois's statewide rate is 6.25%. With an average local rate of 2.67%, the typical combined rate is about 8.92%.
How much is sales tax on $100 in Illinois?
At the average combined rate of 8.92%, sales tax on a $100 purchase is about $8.92, for a total of $108.92. Your exact rate depends on your city and county.
Why is my local rate different?
Counties and cities in Illinois set their own add-on rates, so the total varies by location. 2.67% is the population-weighted average; enter your exact combined rate for a precise figure.
Sales tax by state
Or use the general sales tax calculator with any rate.