How the sales-tax estimate is calculated
The basic formula is taxable price × tax rate ÷ 100. Add the result to the taxable price to estimate the total.
Which sales-tax rate should I enter?
U.S. sales tax can vary by state, county, city, transit district, product type, and delivery location. Enter the combined rate that applies to your specific purchase. Check the seller’s checkout details or your state and local revenue agencies; a statewide rate alone may not be the final rate.
Why can the checkout total differ?
- Some goods or services are exempt, reduced-rate, or taxed differently.
- Delivery destination may determine the applicable local rate.
- Discounts, coupons, deposits, or fees may change the taxable amount.
- Rounding rules can vary by retailer and jurisdiction.
Use the result as a planning estimate, then rely on the seller’s final checkout total and official local guidance for an actual transaction.
Sales-tax calculator FAQs
Does this calculator look up my state’s rate?
No. It applies the rate you enter. Rates and product rules change by location, so use a current rate from the seller or relevant tax authority.
Is tax calculated on the original price or the discounted price?
That depends on the discount and local tax rules. Enter the taxable amount shown by the seller if you need a closer estimate.
Does it include shipping or other fees?
No. The calculator applies the entered rate to the purchase price only. Whether shipping or fees are taxable depends on the jurisdiction and transaction.