Cart Price Rules not applying on shipping VAT when rule applied on whole cart

[Romz]

Preconditions (*)

Magento 2.4.2
2.4-develop having EE and B2B Modules

Steps to reproduce (*)

Using Fresh magento installation with samples datas.

1. Create a tax rate (20%) applied on both products and shipping.
2. In Sales > Tax configuration Panel:
   1. Tax Class for Shipping : Taxable Goods
   2. Catalog Prices: Including Tax
   3. Shipping Prices: Including Tax
   4. Apply Discount On Prices: Including Tax
   5. Enable Cross BorderTrade : Yes
3. Create a new cart rule
   1. Coupon: Specific Coupon
   2. Apply: Fixed amount discount for whole cart
   3. Discount Amount: 56
4. Add a product in shopping cart (51$)
5. Go to checkout and use a shipping methods: Flat Rate 5$
6. Apply the cart rule using the coupon code

Expected result (*)

1. -56$ dicount applied
2. 0$ on Order total

Actual result (*)

1. -55.17$ discount applied
2. 0.83$ on order total

The discount seems to be only applied on Shipping amount excluding tax. In that case 4.17$.
That's explain the -55.17$ discount amount on shopping cart (51 + 4.17)

For more details about the issue and configuration, please check this link

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• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @Romz. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

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Please, add a comment to assign the issue: @magento I am working on this

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[m2-assistant]

Hi @engcom-Oscar. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).

  Details

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[engcom-Oscar]

Hi @Romz ! Thank you for your report.

Unfortunately, we are not able to reproduce the issue on a fresh 2.4-develop by following steps from this ticket.

Steps to reproduce (*)

1. Create a tax rate (20%) applied on both products and shipping.
2. In Sales > Tax configuration Panel:
   1. Tax Class for Shipping : Taxable Goods
   2. Catalog Prices: Including Tax
   3. Shipping Prices: Including Tax
   4. Apply Discount On Prices: Including Tax
   5. Enable Cross BorderTrade : Yes
3. Create a new cart rule
   1. Coupon: Specific Coupon
   2. Apply: Fixed amount discount for whole cart
   3. Discount Amount: 56
4. Add a product in shopping cart (51$)
5. Go to checkout and use a shipping methods: Flat Rate 5$
6. Apply the cart rule using the coupon code

Actual Result: ✔️
Order summary before applying coupon:

Order summary with discount after applying coupon:

Please recheck - may be you missed some details in issue description.

[Romz]

I found out that the issue is before the checkout step.

Here the steps to reproduce.

• Clear all cookies
• Add product in shopping cart ($22 in my case)
• Estimate shipping price (it show $10)
• Apply the coupon

Result:

Subtotal: $22
Dicount: $30.33
Shipping (Flat Rate - Fixed): $10
Tax: $0.28

Order Total: 1.67

The when I do the checkout process and set my address, the problem gone.

[Romz]

Hi @engcom-Oscar engcom-Oscar

I tried to use my $100 coupon on $102 subtotal + $15 shipping and I have an odd result. Discount applied: $101.58 which is more than the amount on my coupon rule.

[m2-assistant]

Hi @engcom-Echo. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).

  Details

  If the issue has a valid description, the label Issue: Format is valid will be added to the issue automatically. Please, edit issue description if needed, until label Issue: Format is valid appears.

• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue. If the report is valid, add Issue: Clear Description label to the issue by yourself.

• 3. Add Component: XXXXX label(s) to the ticket, indicating the components it may be related to.

• 4. Verify that the issue is reproducible on 2.4-develop branch

  Details

  - Add the comment @magento give me 2.4-develop instance to deploy test instance on Magento infrastructure.
  - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!

• 5. Add label Issue: Confirmed once verification is complete.

• 6. Make sure that automatic system confirms that report has been added to the backlog.