Sales Tax Calculator
Choose whether your amount already includes tax, enter the tax rate, and see the breakdown.
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What this tool does
Choose whether your amount already includes tax, enter the tax rate, and see the breakdown.
Formula
Adding tax: total = amount × (1 + rate/100). Extracting tax from an inclusive total: pre-tax = total / (1 + rate/100), tax = total - pre-tax.
Frequently asked questions
Does this handle multiple tax rates (state + local)?
Combine them into one effective rate first (e.g. add state and local percentages) and enter that combined rate.
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