Wrong Total when Price including-Tax when Cart has active coupon

[zexperto]

Preconditions and environment

• Magento version: 2.4.7-p4
• Fresh Magento: no customization

Steps to reproduce

in Fresh Magento

1. Create Tax Zone and Rate (Switzerland with 8.1%)
2. Create new Rule for this Rate
3. set the default Country in Store->Configuration->Tax: default country - Switzerland
4. Store->Configuration->Tax: Tax Class for Shipping: Taxable goods
5. Store->Configuration->Tax: Catalog Prices: Including Tax
6. Store->Configuration->Tax: Shipping Prices: Including Tax
7. Store->Configuration->Tax: Enable Cross Border Trade
8. Create a Cart discount with 10%
9. Create Flat Rate shipping cost with 9.9
10. Create new simple Item with SKU: simple, name = Simple
11. Set the Price = 13.50
12. Tax Class = Taxable Goods
13. add the product to the cart then make the QTY = 6
14. you will see that the total of the cart is wrong

Subtotal CHF74.93
Discount (Valentin25) -CHF7.49
Shipping (Flat Rate - Fixed) CHF9.16
Tax CHF6.25
Order Total CHF83.41

I have attached here all needed screenshot

Expected result

the Expected total should be
74.93 - 7.49 = 67.44 + (the tax for 67.44 which is around 5.46) + 9.9
Order Total CHF82.80

Actual result

Order Total CHF83.41

Additional information

No response

Release note

Tax Zone and Rate

Tax Rate

Sales->Tax Configuration

Coupon

Simple Item:

Cart

Triage and priority

• 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]

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[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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[engcom-Bravo]

Hi @zexperto,

Thanks for your reporting and collaboration.

We have tried to reproduce the issue in Latest 2.4-develop instance and we are able to reproduce the issue.Kindly refer the screenshots.

Order Total CHF83.41.

Hence Confirming the issue.

Thanks.

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.adobe.com/browse/AC-14291 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Bravo. Thank you for verifying the issue.
Issue Available: @engcom-Bravo, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[zexperto]

@engcom-Bravo not sure if it is possible but I believe this issue need to have a high priority as it affect the customer business, what do you think?