Whenever you are having trouble getting your calculator to match, 99% of the time the answer is in the calculator tutorial.
See section: Selling Price
This is the selling price of the vehicle, before incentives. This the negotiated price of the vehice, pre-incentive , with any non-residualized items added on (accessories, wear and tear, etc).
I don’t accept the garbage add on so I don’t have experience putting them into the calculator. But if I did I would follow the instructions for “non-residualized” items added on.
Hope this works for you.