Hi,
There is only one file we worked one (where all the taxes calculations are made.
It's the file administrator/components/com_hikashop/classes/currency.php
Here attached the latest version we have on our end.
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Remember that the "Floating tax prices" is a new option which didn't exist before and so just turn it off and you'll have the exact same working solution as before since we didn't didn't anything with the calculations when that option is turned off.