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Sales Tax Calculator
Add or extract a sales tax using the applicable rate you enter. The US has no general federal sales tax; state and local rates are not selected automatically.
- Tax amount
- 0
- Amount before tax
- 1,000
- Amount including tax
- 1,000
How the calculation works
Add tax: tax = base × rate/100. Extract tax: tax = total × rate/(100+rate).
Inputs
- Amount, $
- Applicable tax rate, %
- Action
Calculation details
Enter the combined rate applicable to the transaction. A zero default does not mean a purchase is exempt.
This arithmetic does not determine nexus, exemptions, sourcing rules, or taxability.
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Updated: 2026-10-02