Display zero tax configuration does not work in case of multiple shipping methods on Cart page

[pranayhbwsl]

Preconditions and environment

• Magento version 2.4.2

Steps to reproduce

1. Enable multiple delivery methods by navigating to Stores -> Configuration -> Sales -> Delivery Methods.
2. Set 'Display Zero Tax Subtotal' to 'No' by navigating to Stores -> Configuration -> Sales -> Tax -> Shopping Cart Display Settings.
3. Visit storefront without signing in, add a product to cart and check shopping cart. Zero tax field is visible untill we chose a shipping method.

Expected result

Tax field with value 0.00 should not be visible in cart totals before selecting shipping methods.

Actual result

Tax field with value 0.00 is visible even before selecting shipping method.

Additional information

This issue happens because of strict equals operator in -> vendor/magento/module-tax/view/frontend/web/js/view/checkout/cart/totals/tax.js on line 24.

If we change it '==' the value '0.00' will also satisfy this condition and hide the tax field.

Same operator i.e., '==' is used in vendor/magento/module-tax/view/frontend/web/js/view/checkout/summary/tax.js for tax field zero value display check.

Release note

No response

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-November. Thank you for working on this issue.
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[engcom-November]

Verified the issue on Magento 2.4-develop branch and the issue is reproducible.
tax:0 is displayed in shopping cart page if shipping method is not selected. After shipping method is selected in checkout page and navigated back to shopping cart page, tax:0 is not displayed.

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.magento.com/browse/AC-3201 is successfully created for this GitHub issue.

[m2-assistant]

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