Discount and Sales Tax: Which Comes First?

How to calculate a discounted price plus sales tax. See why the order matters for coupons, with worked examples and a simple formula.

October 23, 2026 · 2 min read

Store discount: $80 minus 25% is $60, plus 8% tax is $64.80. Coupon taxed on full price: $66.40

You find a jacket for $80 with 25% off, and your state charges 8% sales tax. What do you pay at the till?

For a normal store discount, the answer is simple: take the discount first, then add tax to the lower price.

Final price = price × (1 − discount) × (1 + tax rate)

Store discount versus a coupon taxed on the full price

How do you calculate a discount plus sales tax?

Discount: 80 × 0.25 = $20, so the price becomes $60
Sales tax on $60: 60 × 0.08 = $4.80
Total: 60 + 4.80 = $64.80

In one line: 80 × 0.75 × 1.08 = $64.80.

Want to try it right away? Discount Calculator is free and needs no signup.

Does the order of the maths matter?

Not for a percentage discount. Multiplying by 0.75 and by 1.08 gives the same result in any order. What changes the answer is which price the tax is charged on.

When is tax charged on the full price?

Some coupons are paid back to the store by the manufacturer. In certain US states, tax is then charged on the price before the coupon:

Tax on $80: 80 × 0.08 = $6.40
Price after coupon: $60
Total: 60 + 6.40 = $66.40

That is $1.60 more than with a store discount. Rules vary by state and by type of coupon, so check your local tax authority.

Three steps: take the discount, calculate tax, add them up

Quick reference

Price	Discount	Price after discount	Tax 8%	Total
$50	10%	$45.00	$3.60	$48.60
$80	25%	$60.00	$4.80	$64.80
$120	30%	$84.00	$6.72	$90.72
$200	50%	$100.00	$8.00	$108.00

Use the calculators

Work out the discounted price first with the discount calculator, then add tax. If you only need the first step, read how to find the price after a discount. To add or remove tax, see how to calculate sales tax.

FAQ

Is sales tax calculated before or after a discount?

For a normal store discount, tax is calculated after the discount, on the lower price.

How do I calculate a price with discount and tax?

Multiply the price by (1 − discount) and then by (1 + tax rate). For $80, 25% off and 8% tax, that is 80 × 0.75 × 1.08 = $64.80.

Why was I charged tax on the original price?

Some manufacturer coupons do not reduce the taxable price in certain states. Check the receipt and your state rules.

Is this tax advice?

No. It explains the calculation. Tax rules vary by location.