Discounts not adjusting taxes

Q: When I add a manual discount, why isn't it subtracting the taxes also?

A: When you manually add the Discount (e.g. using the "Discount" button), you need to make sure the correct "Auto-Add tax" box is checked (on the screen where you enter the amount of the discount).  Also, it's probably a good idea to make sure the correct Category is selected for the discount, so it comes out of the appropriate account instead of a generic "Discount" account.  If you have the Default tax categories set up appropriately (under Park Setup / Taxes), then when you select the category then it will automatically select the appropriate auto-add tax also.