Calculate sales tax, pre-tax price and final total with a verified state or local combined rate you enter.
Calculate sales tax from a pre-tax price and a verified combined state and local rate, then see the tax-inclusive total.
Sales tax = pre-tax price × combined rate. Total = pre-tax price + sales tax.Use a verified combined rate. A ZIP code or statewide rate alone may not capture local districts, exemptions or sourcing rules.
State authority directory reviewed August 6, 2026
The taxable price you enter
Verify state, local district, sourcing, and product treatment
Enter the legally applicable percentage
Price × rate = estimated sales tax
Pre-tax price + tax
Tax-inclusive planning amount
Use ShipMathLab to combine selling price, product cost, shipping, packaging, marketplace fees, and advertising in one margin estimate.
Sales tax = pre-tax price × combined rate. Total = pre-tax price + sales tax.
Enter the combined rate that applies to your transaction. The tool does not guess a rate from ZIP code.
US rates may combine state, county, city and special-district components; product exemptions and sourcing rules can change the applicable rate.
Result: $10.31 illustrative sales tax and $135.31 total. Verify the address, product taxability, sourcing, date, and rounding rule before collection or filing.
Tax law depends on facts this tool cannot collect. Do not use the result as the sole basis for filing, withholding or payment decisions.
Not reliably. Tax boundaries can differ inside a ZIP code. For filing or collection, use an official address-level source.
Use the Reverse Sales Tax Calculator, which divides the tax-inclusive total by 1 plus the rate.
Each guide answers a different question and links back to the same transparent calculation.
Calculate one transparent transaction and see which legal inputs—location, taxability, sourcing, date, and rounding—the arithmetic cannot determine.
Read the guide →See why multiplying a tax-inclusive total by the rate does not recover the included tax, with a $108.25 example.
Read the guide →Understand postal geography, overlapping tax districts, sourcing, and address-level verification before collecting tax from a customer.
Read the guide →See how cent rounding and calculation level can create reconciliation differences, and why the jurisdiction's rule must control the point-of-sale setup.
Read the guide →Work backward from a tax-inclusive total to find the original price and sales tax amount.
Estimate vehicle sales tax and drive-away total with trade-in treatment, taxable fees and a rate you verify.
Add VAT to a net amount or extract included VAT from a gross amount using a country preset or custom rate.