Sales Tax Calculator with Discount and Shipping
Estimate sales tax, discounts, shipping, taxable base, and checkout total before you buy, quote, or compare prices. Adjust the tax rate and shipping tax option locally.
Purchase estimates
Use subtotal, shipping, discount, and tax rate from a checkout or quote.
Shopping comparisons
Compare final totals when different stores or regions use different tax rates.
Example
$89 with a 10% discount and 8.25% tax produces a taxable base, tax amount, and final total.
Assumption
The entered tax rate is the rate you want applied to the taxable base.
Limitation
The tool does not know local exemptions, product-specific rules, or jurisdiction-specific shipping tax treatment.
Is discount applied before tax?
Yes. The calculator subtracts the discount before calculating tax.
Can shipping be taxed?
Yes. Turn on the shipping option if you want shipping included in the taxable base.
Can I use any currency?
The math works for any currency, though the display uses USD formatting.
Is this legal or tax advice?
No. It is a general estimate.
Suggested workflow
Checkout math path
Start with discount, add tax, then convert percent changes when comparing totals.