Is tax applied before or after a discount?

After — you pay tax on the discounted price you're actually charged.

Why isn't 30% plus an extra 10% the same as 40% off?

Stacked discounts apply sequentially, each on the already-reduced price — 30% then 10% equals a 37% effective discount.

How do I find the original price from a sale price?

Divide the sale price by (1 − discount). $56 at 30% off → 56 ÷ 0.7 = $80.

Discount Calculator

Find the final price after a sale discount — including stacked “extra % off” coupons and sales tax.

Original price

Discount (%)

Extra coupon % (optional)

Sales tax % (optional)

—You Pay

—You Save

—Effective Discount

Why “30% + extra 10%” Isn’t 40% Off

Stacked discounts apply one after another, each on the already-reduced price. An $80 item at 30% off becomes $56; the extra 10% coupon then takes off $5.60, not $8. Final: $50.40 — an effective discount of 37%, not 40%. Retailers count on shoppers missing this; the calculator shows the true number.

Quick Mental Math for Sales

10% off: move the decimal — $47.90 → $4.79 saved.
25% off: quarter the price and subtract.
Compare per-unit: a bigger pack at 20% off may still cost more per item than a store brand.

Frequently Asked Questions

Is tax applied before or after the discount?

After — in virtually all jurisdictions you pay tax on the actual (discounted) price you’re charged. That’s how this calculator applies it.

How do I work out the original price from a sale price?

Divide by (1 − discount). $56 at “30% off” → 56 ÷ 0.7 = $80 original.

Do stacked coupons ever equal their sum?

Only if applied to the original price simultaneously, which stores rarely do. Sequential stacking always yields slightly less than the sum.