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Illinois Reverse Sales Tax Calculator.
Pre-loaded with the 2026 Illinois base state sales tax rate of 6.25%. Adjust sliders below for local taxes.
$
+0.00%
5.0%
%
Pre-Tax Base Price
$ 0.00
Tax / VAT Extracted
$ 0.00
Calculated backwards in real-time
Understanding sales tax in Illinois.
Illinois state sales tax is 6.25%. However, when transacting within Illinois, the total sales tax rate paid is often higher due to local county, city, or special district surtaxes.
How to Back Out Sales Tax in Illinois
To separate the sales tax from the total paid gross amount for a transaction in Illinois, use the standard reverse tax formula:
Base Price = Gross Amount / (1 + (Combined Tax Rate / 100))
For instance, if your combined tax rate (including Illinois state rate of 6.25% and a local rate of 1.50%) is 7.75%, the formula becomes:
Base Price = Gross Amount / 1.0775
After deriving the base price, calculate the sales tax portion by subtracting it from the total gross amount.