🛍️ Shopping Discount Calculator

No — stacked discounts are applied sequentially, each one to the already-reduced price. Two 20% discounts do not equal 40% off; they equal 36% off (0.8 × 0.8 = 0.64, which is a 36% reduction).

In this calculator, cashback is applied to the price after discounts and coupons but before tax, which reflects how most credit card and app cashback programs work. Some programs apply cashback to the final post-tax amount.

A percentage discount reduces the price proportionally (e.g., 20% off a $100 item = $20 off). A coupon is typically a fixed dollar amount off (e.g., $10 off), applied independently of the item price.

Yes — a straight 30% discount gives a greater reduction. 30% off $100 = $70.00, while 20% + 10% stacked = $72.00. The combined effective discount of stacked discounts is always less than the sum of the individual percentages.

Yes, in most US states sales tax is calculated on the post-discount selling price, not the original price. However, rules vary — some states tax before discounts or have specific rules for coupons.