Order matters (a little)
In most places sales tax is charged on the discounted price, so a discount saves you tax as well. That is how this calculator works. A few stores apply a coupon after tax; check your receipt if the number differs.
Stacked discounts
Two discounts of 20% and 10% are not 30% off. The second applies to an already-reduced price, giving 28% off in total (0.8 × 0.9 = 0.72). Run the calculator twice to see it, using the first result as the new price.
Removing tax
To find the pre-tax price from a total, divide by 1 + the tax rate. For a $113 total with 13% tax, the pre-tax price is $100 and the tax is $13. Switch the menu to "Remove tax from a total".
Frequently asked questions
Is 50% off then 20% off the same as 70% off?
No, it is 60% off. 0.5 × 0.8 = 0.4 of the original price.
What tax rate should I use?
Use your local rate - for example combined GST/HST/PST in Canada, or state plus local sales tax in the US.
Can I enter a price with tax included?
Yes - switch to "Remove tax from a total".