Discount + Tax Calculator

How to calculate final price after discount and tax

The key rule: tax is always calculated on the sale price, not the original price. Apply the discount first, then calculate tax on the reduced amount. Doing it in the wrong order gives a higher (incorrect) result.

The formula: Final price = Original × (1 − Discount% ÷ 100) × (1 + Tax% ÷ 100).

Worked example

A $150 jacket is 30% off with 8.5% sales tax:

Step	Calculation	Result
Original price		$150.00
Apply 30% discount	$150 × 0.70	$105.00 (sale price)
You save	$150 − $105	$45.00
Add 8.5% tax	$105 × 1.085	$113.93 (final total)
Tax amount	$113.93 − $105	$8.93

What if there’s no discount (tax only)?

Enter 0 in the discount field. The calculator will show the tax amount and final price for any original price and tax rate — effectively working as a sales tax calculator. For European VAT rates, use the VAT calculator which includes country presets for the UK, Netherlands, Germany, France, and Switzerland. For a full breakdown of European rates, the VAT rates by country table covers all 27 EU members plus the UK and Switzerland.

What if there’s no tax (discount only)?

Enter 0 in the tax field. The result is identical to our discount calculator. This combined tool is most useful when shopping in US states or countries that apply tax at checkout after store discounts.

Effective discount after tax

If a $200 item is 25% off and you’re in a 9% tax state, your final price is $200 × 0.75 × 1.09 = $163.50. The nominal saving is $50 before tax, but you actually pay $13.50 in tax on the reduced price, so the net saving versus the original taxed price ($218) is $54.50. Tax on a discounted item always costs you less in absolute dollars than tax would have on the full price.

Stacking multiple discounts

When a store applies two discounts — for example, a 20% sale plus a 10% coupon — they are applied sequentially, not added together. A $100 item at 20% off = $80, then 10% off $80 = $72. The combined effect is 28% off, not 30%. Tax is then applied to the final $72. For more than two discounts, use the stacked discount calculator to see the true combined rate across all layers. If a coupon says “10% off your entire purchase,” it is typically applied to the already-discounted subtotal before tax. Use this calculator with whichever combined discount you calculate first, then enter the tax rate to get the checkout total.

Price-matching and post-purchase discounts

If a store price-matches a competitor after you have already been charged, the refund is calculated on the purchase price you paid, not the original retail price. A $120 item bought at 10% off ($108) that later price-matches to $90: the refund is $108 − $90 = $18. If you paid tax originally, the refund may or may not include tax depending on the retailer’s policy and your state’s tax rules.

VAT on discounted items in the UK and EU

In the UK and EU, VAT is always calculated on the discounted price, not the full price. A £150 item at 20% off carries VAT on £120, not £150. For UK standard-rated items (20% VAT): £120 × 1.20 = £144. The VAT amount is £24 — less than the £30 VAT that would apply at full price. The percent off calculator works backwards from any two values if you need to verify the discount percentage applied.