Work out what you’ll pay after a discount and sales tax: the sale price, how much you save and the final total.
Results update automatically as you type.
How to Calculate Discount and Tax
Take the discount off first, then add tax to the lower sale price. An $80 item at 20% off saves $16, so the sale price is $64. Add 7% sales tax ($4.48) and you pay $68.48 at checkout.
| Step | Amount |
|---|---|
| Original price | $80.00 |
| 20% discount | −$16.00 |
| Sale price | $64.00 |
| 7% sales tax | +$4.48 |
| Final price | $68.48 |
The Formula Behind the Sale Price
It's three steps: savings, sale price, then tax if you owe any.
Formula: Savings = P × (d ÷ 100); Sale Price = P − Savings; Final Price = Sale Price × (1 + t ÷ 100)
- Savings: $80 × (20 ÷ 100) = $16.
- Sale price: $80 − $16 = $64.
- Final price: $64 × (1 + 7 ÷ 100) = $68.48.
- P: the original price of the item before any discount
- d: the discount percentage, entered directly or picked from the 10% / 25% / 50% / 70% presets
- t: the sales tax percentage applied after the discount (optional; leave blank for 0%)
Example Scenarios
| Original Price | Discount | Sales Tax | Final Price |
|---|---|---|---|
| $100.00 | 10% | 0% | $90.00 |
| $250.00 | 25% | 0% | $187.50 |
| $500.00 | 50% | 8% | $270.00 |
| $80.00 | 20% | 7% | $68.48 |
| $1,000.00 | 30% | 0% | $700.00 |
Do You Apply Tax Before or After a Discount?
After. This price calculator with discount and tax applies tax to the sale price, which matches how most retailers charge it. Enter your local combined sales tax rate to see the total at the till.
How to Calculate Two Successive Discounts
Multiply the remaining shares rather than adding the percentages. 30% off then 20% off leaves you paying 0.7 × 0.8 = 56% of the price, a 44% total discount, not 50%. To use this as a double discount calculator with tax, run the first discount, then enter that sale price as the new original price with the second percentage and your tax rate. On $100 with 8% tax, that gives $56 and then $60.48.
Is the Deal Actually Good?
Only if the starting price is honest.
- Use the price the item usually sells for, not an inflated "was" price.
- Include shipping and fees. A 25% discount with paid delivery can cost more than a smaller discount with free shipping.
Multi-buy offers such as "buy two, get one free" work out to a 33% saving per item only if you want all three. For background, see discounts and allowances on Wikipedia.
Common questions about discounts and sales tax
How do you calculate discount and tax?
Subtract the discount from the original price, then multiply the sale price by 1 plus the tax rate. For $80 at 20% off with 7% tax: $80 − $16 = $64, and $64 × 1.07 = $68.48.Do you apply tax before or after a discount?
This calculator applies your tax rate to the already-discounted sale price, not the original price, which matches how most retailers charge a store discount. Local rules for things like manufacturer coupons can differ.How do you calculate two successive discounts?
Apply them one after another, not added together. 30% off then 20% off leaves 0.7 × 0.8 = 0.56 of the price, a 44% total discount rather than 50%. Here, enter the first sale price as a new original price with the second percentage.How do I calculate a 25% discount on $80?
Multiply $80 by 25% to get $20 in savings, then subtract that from $80 to get a $60 sale price. Enter 80 and 25 and the calculator does this instantly, plus adds tax if you owe any.How is the "you save" amount calculated?
Your savings is the original price multiplied by the discount percentage. It's calculated before tax, so it reflects only the value knocked off by the discount itself.Does this calculator work for any currency?
Yes. The math only multiplies and subtracts the numbers you enter, so use whatever currency your original price is in and the results will be in that same currency.Related Calculators
If you're comparing prices rather than working from one item, try the tool to compare unit prices across package sizes. Shoppers dealing with tax-inclusive pricing may also want to work out sales tax on a purchase separately, and if you're starting from two prices instead of a percentage, you can find the percent off between an original and sale price. See also the StockX Fee Calculator. See also the CSS Ribbon Generator.