MEASUREMENTS AND PURCHASE DECISIONS
Apply sequential discounts on the supplied tax basis.
Why are two discounts not normally added together?
Use the matching calculator
Use this decision sequence
- Confirm which merchandise is eligible for each quoted discount.
- Apply the first discount to merchandise, then the second to the discounted remainder.
- Add delivery separately.
- Use the supplied tax percentage and stated tax basis, rather than inferring a jurisdiction.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| 10% then 10% | Leaves 81% of the original merchandise subtotal. |
| 20% once | Leaves 80%, a different quote. |
| Tax basis | Must be supplied explicitly for the comparison. |
Worked comparison
On $100 merchandise, two sequential 10% discounts produce $81. Add $10 delivery. With a supplied 10% tax applied to merchandise only, tax is $8.10 and the quoted total is $99.10.
Check before using the estimate
The calculator does not decide tax eligibility, legal rates or seller discount policy.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.