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.
Try a common tax scenario
Final total
$93.70
Discount
$8.90
Taxable base
$80.10
Sales tax
$6.61
After discount
$80.10
Sales tax estimate note
Sales tax rules vary by jurisdiction, product type, exemption, and marketplace. Treat this as a quick estimate, not tax advice.
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.
Calculate sales tax
Estimate tax amount from a subtotal and known local tax rate.
Tax on purchase calculator
Add sales tax to a purchase estimate before checkout or quote review.
Sales tax after discount
Apply a percent discount first, then estimate the taxable base and final total.
Checkout total calculator
Combine discount, shipping, tax rate, and shipping tax assumptions in one estimate.
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.