How to calculate the final price: sale, coupon and sales tax
At a US register the tax is added to the price you actually pay. With a sale, that is usually the sale price. The steps are short.
Step by step
1. Take the tag price. 2. Subtract the store's sale: price × (1 − discount). 3. Multiply the result by the tax rate and add it. Example: a $120 item, 30 % off, in a place with 8.25 % tax: $120 − $36 = $84; tax $6.93; you pay $90.93.
Coupons
A store coupon usually lowers the amount that is taxed. Manufacturer coupons are treated differently from state to state. When a coupon is involved, the receipt is the final word.
Exemptions come first
In states where clothing, food or other items are exempt or taxed at a lower rate, that rule decides how much tax is added. A tax-free weekend can remove the tax entirely for the covered items.
Let the app do it
Summalo reads the tag, takes the sale you enter and applies the rule of the place, offline. It shows the steps so you can see what was applied.
Questions and answers
Is sales tax calculated before or after the discount?
Usually after a store discount, on the price you pay. Coupon rules vary by state.
How do I work out the price without tax from a receipt total?
Divide the total by 1 plus the tax rate, for example total ÷ 1.0825 for 8.25 %.
Does the tag price ever include tax?
Rarely. Some places, such as airports or vending machines, may show a price with tax; the receipt tells you.
More guides
- US sales tax for visitors explained
- Tax refund for tourists in the USA: is there one?
- Sales tax on clothing by state: which states exempt it?
- States without sales tax: where shopping can be cheaper
- Tax-free weekends and sales tax holidays 2026 and 2027
- Where Summalo's tax data comes from
These pages summarise the rules Summalo uses. They are estimates, not tax advice. At the register, the store's receipt is what counts. Summalo applies these rules to the tag you scan, offline.