Hi, usually the discount is reduced by the netto price (price without the tax). If you don't use prices without tax, then just disable the tax in options so the discount will be reduced from the final price.
Since version 5.0.0 you can even use tax calculation and reduce the discount from price with tax (it is recommended then to not use rounding, etc. because setting discount is very complicated calculation where e.g. the discount needs to be spread out to all products and when it is including tax, it can have problems when roudning - as each product item is rounded, etc. etc.):
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Jan
Since version 5.0.0 you can even use tax calculation and reduce the discount from price with tax (it is recommended then to not use rounding, etc. because setting discount is very complicated calculation where e.g. the discount needs to be spread out to all products and when it is including tax, it can have problems when roudning - as each product item is rounded, etc. etc.):

Jan
Statistics: Posted by Jan — 15 Apr 2025, 15:43