2.2.8 Configurable product option dropdown - price difference incorrect when catalog prices are entered excluding tax

[danielpfarmer]

After upgrading to 2.2.8 we have noticed that configurable products that have only have one configurable attribute display a price increase in the dropdown of the tax amount. This seems to be only affecting stores when prices are entered excluding tax and configurable products with only one configurable attribute.

Preconditions (*)

1. Magento 2.2.8
2. Catalog Prices are EXCLUDING TAX (Stores > Configuration > Sales > Tax > Calculation Settings > Catalog Prices (Excluding Tax)

Steps to reproduce (*)

1. Create a configurable product with only one configurable attribute (e.g color).
2. Assign simple products to the configurable, and set all simples to be the same price.
3. Load configurable product page.
4. View options in the configurable attribute.

Expected result (*)

1. The attribute dropdown does not show an increase in price as all attached simples are the same price and tax is already rendered in the final price at the top of the page.

Actual result (*)

1. Observe that the dropdown displays an incorrect increase in price. It adds on the tax amount of the product onto the price increase when this is already rendered in the product final display price at the top of the page.

Magento 2.2.6 (Correct)

Magento 2.2.8 (Incorrect)

In this example, each simple product was added into Magento with a price of £150 and a special price of £122.49. The tax settings then add on an additional £24.50 (20% VAT).

[m2-assistant]

Hi @danielpfarmer. Thank you for your report.
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@danielpfarmer do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[danielpfarmer]

Yes I can and just have replicated this on a vanilla instance of Magento 2.2.8 with sample data.

Steps to reproduce:

1. Install Magento 2.2.8 with sample data
2. Set stores > config > Sales > Shipping Settings > Origin = United Kindgom
3. Set stores > config > Sales > Tax > Calculation Settings > Tax Calculation Based On = Shipping Origin
4. Set stores > config > Sales > Tax > Price Display Settings > Display Product Prices In Catalog = Including Tax
5. Create new tax option for UK at 20%
6. Edited the Antonia Racer Tank to only be configurable size and adjusted the attached simples accordingly.

[m2-assistant]

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Hi @danielpfarmer thank you for you report, this is expected behavior introduced in -> #17695

[hostep]

@engcom-backlog-nazar: closing this makes no sense, since this ticket is about seeing the taxes in the dropdown. This might be a regression introduced by #17695.

@hostep ok, the core issue that

EXCLUDING TAX (Stores > Configuration > Sales > Tax > Calculation Settings > Catalog Prices (Excluding Tax)

does not affect in prices of dropdown attribute ?