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I have been searching for months for a solution to this error I've found which seems to me quite serious.
It's an error that is seen with the naked eye.
The steps to reproduce it are very simple:
Product - 165.21€ tax excl. with a 50% reduction
Shipping - 24.42€ tax excl.
As you can see, the total is 130.21€ with taxes included, but the operation to calculate tax should be total price tax excl * tax rate / 100. I'm using a 21% fee.
So, (82.61 + 25.42) * 21 / 100 = 22.6863 which rounded is 22.69€ while PrestaShop shows 22.68€
I think PrestaShop is not rounding the price calculation when it has a discount, product price with tax included is 99.95€ tax included when it should be 99.96€
165,21 * 50 / 100 = 82.605€ * 1.21 = 99.95€
Tools::ps_round(165,21 * 50 / 100, 2) = 82.61€ * 1.21 = 99.9581 ~ 99.96€