Sales Tax Calculator
Estimate sales tax, taxable subtotal, discounts, shipping treatment, and checkout total from a local rate you provide.
How it works
Sales tax estimates start with the taxable amount and the combined rate you provide. Enter the subtotal before tax, then add the rate for the location or scenario you are checking.
The default mode subtracts any discount, optionally adds taxable shipping, multiplies the taxable amount by the rate, and adds shipping and tax to the order total.
Sales tax = taxable amount × sales tax rate
Tax-included mode is useful for receipts or advertised prices that already include tax. It backs the tax out of the entered taxable amount by dividing by one plus the rate, then reports the pre-tax amount and tax portion.
Assumptions and limitations
This calculator uses the rate and taxability choices you enter. It does not look up current jurisdiction rates, product exemptions, marketplace rules, tax holidays, rounding laws, nexus obligations, or filing requirements.
Use the result as a planning estimate or receipt check only. It is not financial, tax, legal, accounting, or compliance advice.
All calculations happen locally in your browser. Your amounts, rates, and assumptions are not sent to a server.
