Finance tool
Sales Tax Calculator
Switch between adding tax, extracting tax from a tax-inclusive total, and solving a tax rate from two amounts.
Sales tax mode
Total after tax
$108
Before tax$100
Tax$8
Effective rate8.3%
Tax-inclusive prices require reverse math
When tax is already included, divide the total by one plus the tax rate rather than subtracting the rate directly. The calculator reports the implied pre-tax price, tax amount, and effective rate.
Sales tax rules vary by jurisdiction, product, shipping, and exemptions. Treat the result as a transparent estimate.
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