Hi Samuel,

Unlike the Additional Cost, there are no options to control the 'taxability' of Receipt discounts in Inventory. There is no option like 'Include tax in discount base' as there is in OrderEntry. Thus whatever discount percent or amount you enter on the Totals tab, this will affect the receipt amount prior to any tax calculations.

Additional Costs cannot be negative, so entering a negative additional cost instead of a discount would not be a workaround.

I can write this up as a suggestion for R&D to consider.