Retail Shopper Tool
Discount and Sales Tax Calculator
Calculate your exact out-the-door price by applying percentage discounts and US state/local sales tax. In most states, store discounts reduce the taxable subtotal before sales tax is added.
Enter Tag Price & Discount
Applying 9.5% sales tax for California (Beverly Hills, ZIP 90210).
$20.00
(20% off tag price)
$80.00
Pre-tax subtotal
$7.60
Rate: 9.5%
$87.60
Final amount to pay
How Discounts and Sales Tax Work in US Retail
In the United States, retail price tags almost never include sales tax. When a store advertises a sale, such as “25% off all footwear” or a seasonal “buy one get one 50% off”, shoppers often wonder what they will actually pay at checkout.
Calculating the final price requires two sequential calculations:
- Apply the Store Discount: Multiply the retail tag price by the discount percentage to determine your total cash savings, then subtract that amount to find the discounted subtotal.
- Calculate State & Local Sales Tax: Multiply the discounted subtotal by the applicable combined state, county, and city sales tax rate.
- Add Tax to Subtotal: Combine the discounted price with the sales tax to get your final out-the-door cost.
Store Discounts vs. Manufacturer Coupons: The Tax Difference
A common question among US shoppers is whether sales tax is calculated on the original price or the discounted price. The answer depends on who funds the discount:
Store Discounts & Retailer Sales
When a retailer discounts an item (e.g. Target 20% off sale, clearance discounts, store loyalty discounts), the retailer simply accepts a lower selling price.
Tax is calculated on the LOWER discounted price.
Manufacturer Coupons & Rebates
When you use a manufacturer coupon clipped from a circular or app, the product manufacturer reimburses the store for the face value of the coupon.
In most states, tax is charged on the FULL original price.
Discount and Sales Tax Quick Reference Table
The table below demonstrates how common discounts and a typical 8.25% sales tax rate (standard across Texas and many metropolitan areas) affect a $100 purchase:
| Tag Price | Discount | You Save | Sale Price | Tax (8.25%) | Final Out-the-Door |
|---|---|---|---|---|---|
| $100.00 | 10% off | $10.00 | $90.00 | $7.43 | $97.43 |
| $100.00 | 20% off | $20.00 | $80.00 | $6.60 | $86.60 |
| $100.00 | 30% off | $30.00 | $70.00 | $5.78 | $75.78 |
| $100.00 | 50% off | $50.00 | $50.00 | $4.13 | $54.13 |
Frequently Asked Questions
Is sales tax applied before or after a discount in the US?+
In the United States, store discounts, percentage-off sales, and retailer coupons reduce the taxable price before sales tax is calculated. However, manufacturer coupons or mail-in rebates are usually taxed on the full original price because the retailer is reimbursed by the third-party manufacturer.
How do you calculate a discount with sales tax?+
First, multiply the original price by the discount percentage and subtract it to get the discounted subtotal. Second, multiply the discounted subtotal by your combined state and local sales tax rate to find the tax. Finally, add the sales tax to the discounted subtotal to get the out-the-door price.
Why don't US price tags show the tax-included price?+
Unlike European VAT systems, the United States has over 11,000 local taxing jurisdictions across 50 states, counties, and cities with varying rates. Because rates change by city and street address, US retailers list pre-tax prices on tags and add sales tax at checkout.
Do tax holidays apply to discounted items?+
Yes. If a state has a sales tax holiday with a per-item price cap (such as clothing under $100), the qualifying price is generally the discounted sale price, not the original retail tag price.