Can I subtract the tax percentage from a total?
No. To remove included tax, divide by one plus the percentage expressed as a decimal. Subtracting 8.5% from $108.50 would understate the pre-tax amount.
Sales Tax Calculator - Add or Remove VAT and GST
Calculate a tax amount and total price from tax-exclusive or tax-inclusive amounts.
Choose whether to add tax to a pre-tax price or remove tax from an included total.
Sales tax details
Enter an amount, tax percentage, and the direction of the calculation.
About sales tax, VAT, and GST
Tax-inclusive and tax-exclusive prices answer different questions. When you have a pre-tax price, add the tax rate to estimate what a customer pays. When you have a total that already includes VAT, GST, or sales tax, divide by one plus the tax rate to find the embedded pre-tax amount; subtract that amount from the total to find the tax. The sales tax calculator supports both directions so the base amount and tax are not accidentally overstated. For example, adding 8.5 percent to $100 produces $8.50 of tax and a $108.50 total. Removing 8.5 percent from a $108.50 tax-inclusive total produces a $100 base and $8.50 tax. Simply subtracting 8.5 percent from an inclusive total is incorrect because the percentage was applied to the smaller base amount. Actual tax depends on jurisdiction, product type, buyer status, destination, thresholds, exemptions, filing rules, and the date of sale. Some places have layered state, county, city, district, or special-purpose rates. VAT systems may allow registered businesses to recover input tax, while retail sales tax is commonly collected from the final customer. Shipping, tips, discounts, digital goods, and bundled services may be taxed differently. Use a rate from the relevant authority or tax professional and round according to the local rule. The sales tax calculator uses straightforward percentage math and displays currency to two decimals; invoice systems may have line-level or invoice-level rounding differences. It does not determine whether a transaction is taxable, select a jurisdiction, or prepare a tax return. Keep supporting records and treat the result as a check on a known tax rate. When a transaction contains several items, identify the taxable base before applying a percentage. A coupon funded by the seller, a manufacturer rebate, a service charge, or a delivery fee can have different treatment depending on the jurisdiction. For cross-border sales, customs duties and import taxes may be separate from the rate used here. Businesses should retain the customer location, exemption documentation, invoice date, and rate source, since those facts can determine the tax result. Consumers can use the total for budgeting, but should rely on the seller’s receipt for the amount charged. Review official guidance whenever tax rules, registration status, product classification, or the place of supply is uncertain.
Businesses should also consider whether their systems store taxable and exempt line items separately. Applying one blended rate to an order can be misleading when a basket includes food, services, discounts, or delivery fees with different tax treatment. Use the calculator as a numerical check after taxability has been established.
Sales tax examples
Examples show adding a rate to tax-exclusive amounts.
| Tax inputs | Total | Planning note |
|---|---|---|
| $100 pre-tax at 8.5% | $108.50 | Tax is $8.50. |
| $200 pre-tax at 8.5% | $217.00 | Tax is $17.00. |
| $108.50 tax-inclusive at 8.5% | $100.00 pre-tax | Remove-tax mode divides the inclusive total by 1.085. |
How to add or remove sales tax
- Choose whether the entered amount excludes or includes tax.
- Enter the amount and applicable rate.
- Select Calculate to review base, tax, and total.
- Verify the rate and rounding method with the relevant authority.
Sales tax FAQ
Does this find my local rate?
No. Enter the rate that applies to your transaction and jurisdiction. Combined city, county, and district rates can differ from a statewide headline rate.
Is VAT the same as sales tax?
They are different tax systems, but both can use tax-inclusive or tax-exclusive price math. Enter the rate that actually applies to the invoice.
Why can invoices differ by a cent?
Tax systems can round each line or the overall invoice at different stages. A one-cent difference is common and does not always indicate an error.