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Illinois Sales Tax Formula:
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The Illinois Sales Tax Rate Calculator computes the total sales tax for purchases in Illinois, combining the state rate of 6.25% with local tax rates that can be up to 4.75% as of October 2025.
The calculator uses the Illinois sales tax formula:
Where:
Explanation: The formula calculates sales tax by applying the combined state and local tax rates to the purchase amount.
Details: Accurate sales tax calculation is essential for businesses, consumers, and financial planning. It helps determine the true cost of purchases and ensures compliance with Illinois tax laws.
Tips: Enter the purchase amount in USD and the local tax rate as a fraction (e.g., 0.0475 for 4.75%). Local rates in Illinois can vary by municipality and cannot exceed 4.75% as of October 2025.
Q1: What is the current Illinois state sales tax rate?
A: As of October 2025, the Illinois state sales tax rate is 6.25%.
Q2: What is the maximum local sales tax rate in Illinois?
A: Local municipalities can add up to 4.75% in additional sales tax, making the maximum combined rate 11%.
Q3: Are all items subject to sales tax in Illinois?
A: Most retail purchases are taxable, but there are exemptions for certain items like groceries, prescription drugs, and medical devices.
Q4: How do I find my local sales tax rate?
A: Local sales tax rates can be found on the Illinois Department of Revenue website or by contacting your local municipality.
Q5: Does this calculator include special taxing districts?
A: This calculator uses the basic state and local rates. Special district taxes (RTA, Metro East, etc.) may apply in certain areas and should be added separately if applicable.