How to Use the Stacked Discount & Sales Tax Calculator
-
1
Enter the original item retail price (e.g. $120.00).
-
2
Add Primary Discount % (e.g. 40%) and optional Secondary Stacked Coupon % (e.g. 15% off remaining).
-
3
Enter your local Sales Tax % (e.g. 8.25%).
-
4
Review final out-of-pocket price, total dollar savings, and effective overall discount percentage.
Practical Example & Use Case
Common Real-World Scenario
A $100 jacket with 30% off plus an extra 20% off coupon costs $56.00 before tax (effective 44% discount, not 50%).
Technical Notes & Limitations
Browser Engine Architecture
Demonstrates why stacked percentages apply multiplicatively rather than additively.
Frequently Asked Questions
Why isn't 30% off plus 20% off equal to 50% off?
Because the second 20% discount applies to the already-reduced price (70%), saving 14% of the original price for a total discount of 44%.