Why wrong sub total when I adding coupon code?

[vipinsimpl4aed]

I did created a Coupon under "Cart Price Rule"
=========COUPON SETTINGS======================
Rule name: $20 Coupon
Websites :" Mai Website

Customer Groups : General

Uses per Coupon : 0
Uses per Customer: 1

Condetion

If ALL  of these conditions are TRUE :

• Subtotal  equals or greater than  19.8  

Actions

Apply : Fixed Amount Discount for Whole Cart

Discount Amount : 20

================================

When I add my Coupon code on my Order

it showing

26.76 + 30 = 56.76 (subtotal+shipping)

56.76 - 20 = ?

Expected Result = 36.76

Actual Result = 35.36

Differance is = 1.4

Why this difference ?

[Nishu Jindal]

Hi @vipinsimpl4aed ,

try after modifying 2 settings in cart price rule

1. Apply to Shipping Amount -- YES

2. Discard Subsequent Rules -- YES

https://docs.magento.com/user-guide/marketing/price-rules-cart-create.html

After the changes, clear the cache and try to first remove and again apply cart price rule on the cart.

Hope this helps you!
Problem Solved! Click Kudos & Accept as Solution!

[vipinsimpl4aed]

The issue resolved.

The real problem is the calculation after and before the Coupon code. Actually, the Tax varying when adding discounts. The Client calculated cart subtotal - Discount   => Amount this amount is greater than the real amount.

So the calculation is like this

Total = Subtotal Excl Tax - Discount

Grand total = Total+(Total* percentage of tax / 100)

So the Subtotal is correct.

if any confusion on this Cart Subtotal. We must change Shoping Cart Display Settings > Disaply Subtotal > Exclude tax option