Business
Calculate tax, subtotal, and final total for a purchase.
Enter your numbers to see the answer.
Sales tax calculator guide
Sales tax is calculated from the taxable base and the rate that applies where the sale takes place. This calculator multiplies the price per item by quantity to get a subtotal, removes any percentage discount to find the taxable amount, applies the tax rate you enter, and shows the sales tax and the final total. Discounts, exemptions, shipping charges, local add-on rates, and tax-inclusive pricing can all change the base, so the page keeps the jurisdiction, tax year, source, update owner, and review date visible instead of pretending to know every rate. Use it to check a receipt, price an item for a customer, or work out how much a purchase will really cost. The result excludes shipping, tips, deposits, and product-specific excise taxes unless you fold them into the price, and it is a planning estimate rather than tax advice.
Subtotal = price per item × quantity. Taxable amount = subtotal × (1 − discount ÷ 100). Sales tax = taxable amount × tax rate ÷ 100. Total = taxable amount + sales tax.
Worked example with the defaults: one item at $100 gives a subtotal of $100 × 1 = $100.00. With no discount the taxable amount stays $100.00. At the default 8.25% rate, sales tax is $100 × 8.25 ÷ 100 = $8.25, and the final price the calculator displays is $100.00 + $8.25 = $108.25. Buying three of the item with a 10% discount changes the base: $300 subtotal less $30 leaves $270 taxable, tax is $270 × 0.0825 = $22.28, and the total is $292.28 rather than the $294.75 you would pay if tax were charged on the full $300 before the discount.
Enter the price per item and the quantity, the discount as a percentage of the subtotal, and the tax rate as a percentage such as 8.25, not 0.0825. Combined state, county, city, and district rates should be added into one figure before entering; 6.25% state plus 2% local is 8.25%. The jurisdiction and tax-year fields are labels for traceability and do not look up a rate for you.
Use the result as a receipt or budget check. Confirm the jurisdiction, product category, exemption, and tax-inclusive pricing rules, because groceries, clothing, and digital goods are taxed differently from place to place.
Do not tax the pre-discount subtotal when the seller applies coupons first; in most US states the taxable base is the discounted price, so the default rate on a 10%-off $300 purchase yields $22.28 of tax, not $24.75. Do not mix combined and local rates by adding a 8.25% combined figure to a 2% city rate that is already inside it. Do not assume every fee is taxable: shipping, deposits, and installation are taxable in some states and exempt in others. Do not enter a tax-inclusive shelf price as the pre-tax price, or you will charge tax twice, and remember that manufacturer coupons and store coupons can be treated differently.
Tax rules vary by jurisdiction and product; confirm with the seller or tax authority.
Sources
How it works
Calculate tax, subtotal, and final total for a purchase. This tool explains the calculation so you can adjust the assumptions to match your situation.
Worked example
With Price per item = 100 $ · Quantity = 1 · Discount = 0 % · Sales tax rate = 8.25 % · Tax year = 2026 → $108.25 (final price including sales tax). Change an input above and this example updates with your numbers.
Common questions
Multiply the taxable amount by the tax rate divided by 100, then add the tax to the taxable amount. A $100 item at 8.25% carries $8.25 of tax for a total of $108.25; apply any discount before the tax, not after, unless local rules say otherwise.
The seller may use a different jurisdiction, taxable base, exemption, rounding rule, or tax-inclusive price. Online sellers charge the rate at the delivery address, and shipping or handling may be taxed too, so a receipt can legitimately differ from this estimate by a few cents or a few percent.
In most US states a store discount reduces the taxable base, so tax is charged on the discounted price. Manufacturer coupons reimbursed to the store are sometimes taxed on the full price, which is why the calculator lets you set the discount to zero for comparison.
Divide the total by 1 plus the rate as a decimal. A $108.25 receipt at 8.25% tax comes from $108.25 ÷ 1.0825 = $100.00 before tax, and the tax was the remaining $8.25.
Use the combined rate for the delivery or store location, which is state plus any county, city, and special-district rates. The default 8.25% is only a placeholder, matching for example the maximum combined rate in Texas; look up your own rate from the state revenue department.