Sales Tax Calculator
Calculate tax and final price from a pre-tax amount, or reverse-calculate the pre-tax price.
Final price breakdown
Enter the rate applicable to the item and location. Exemptions, local rules, and tax-on-tax treatment are not included.
Detailed Breakdown
Pre-tax mode
Enter the price before tax and your applicable rate. Tax = pre-tax price * rate; final price = pre-tax price + tax.
Final-price mode
If the displayed price already includes tax, choose Final price mode. The calculator backs out the base amount as final price / (1 + rate), then shows the tax portion.
Rate selection
Enter the combined rate that applies to the specific item and transaction location. Exemptions, thresholds, and taxable bases vary by jurisdiction.
Limits
This is arithmetic only; it does not look up rates or determine whether a sale is taxable. Shipping, coupons, tax-on-tax, and local rules are not modeled.
Examples
At a 10% tax rate, a pre-tax price of 100 produces 10 in tax and a 110 final price. If 110 is already tax-inclusive, the tax portion at 10% is 10 and the pre-tax amount is 100.
FAQ
Can I calculate tax from a tax-inclusive price?
Yes. Choose the final-price mode and enter the rate that applies to the transaction.
Does the calculator know my local tax rate?
No. Enter the applicable rate yourself. Local, regional, product, and service rules vary.
Are discounts included before tax?
Enter the taxable price after any discount if that is the basis used by your local rules. Use the Discount Calculator first if needed.
Related Calculators
- VAT Calculator — estimate VAT-inclusive or VAT-exclusive prices.
- Discount Calculator — calculate a reduced purchase price.
- Auto Loan Calculator — estimate vehicle tax and financing inputs.
Internal links: calculate a reduced price with the Discount Calculator or compare VAT treatment in the VAT Calculator.