US Sales Tax Calculator with Shipping & Discount

How this calculation works

Taxable base = goods − qualifying discount + taxable shipping.
Sales tax = taxable base × (state rate + local rate) / 100.
Total = goods − discount + shipping + sales tax.

Amounts use two decimal places. VAT extraction rounds the net price and uses the remainder as VAT so the figures reconcile. Other tax charges round to the nearest cent, half up. Per-unit landed costs show four decimal places.

Worked example

Illustrative rates only: goods 100, a qualifying discount of 10 and taxable shipping of 5 create a base of 95. A combined rate of 8.25% gives tax of 7.84 and a total of 102.84. If the same shipping is non-taxable, tax is 7.43 and the total is 102.43.

What to confirm before using the result

State rates alone may omit city, county and district taxes. Use the appropriate tax authority for the address and transaction date. The calculator combines your entered rates and rounds once; it does not determine nexus, marketplace collection, product exemptions or filing obligations. Use separate calculations for different tax categories.

These are arithmetic estimates using your inputs, not tax advice or a filing service. Confirm the transaction’s tax treatment with the relevant authority or adviser. Calculations run in this page; refresh clears the inputs.

Use the result in your trade documents

Download the CSV to keep the inputs and assumptions with your order. After checking the result, enter the appropriate tax amount in your document draft. Opening the editor does not import this estimate or overwrite an existing order.