Sales Tax Calculator
Add or reverse sales tax with discounts and a clean before/after breakdown.
Inputs
Results update as you edit.
Total after tax
$134.06
Results update as the calculator inputs change.
Sales tax
$9.06
Pretax price
$125.00
Tax-included total
$134.06
Tax share of total
6.76%
How to Calculate Sales Tax
How to Use a Sales Tax Estimate
Sales tax calculations are simple when the item is fully taxable and the rate is known. Real purchases can vary because exemptions, local rates, shipping rules, and discounts differ by location.
What Factors Affect Sales Tax?
Sales Tax Calculator Uses
Add Tax
Estimate checkout total from pre-tax price and rate.
Remove Tax
Back into pre-tax price from a tax-included total.
Receipt Check
Compare a receipt's tax amount with the expected rate.
Frequently Asked Questions
How do I add sales tax?
Multiply the taxable price by the tax rate, then add that tax amount to the price.
How do I remove sales tax from a total?
Divide the tax-included total by one plus the tax rate expressed as a decimal.
Does this include local tax?
Only if you enter the combined state and local rate.
Are all products taxable?
No. Exemptions vary by state and product type, so check local rules for important purchases.
Should discounts be applied before tax?
Often yes, but the rule can depend on discount type and jurisdiction.