As for the purpose of calculating the tax only, you would ignore the taxable rebate (I.e. taxed on the full gross cap cost before the rebate), no?
“Manufacturers’ rebates (e.g., a rebate on the purchase of a car or an appliance) are not deductible from the amount of the taxable receipt. This is so whether the rebate is assigned to or paid to the seller at the time of sale, or later paid directly to the purchaser by the manufacturer. Even though the purchaser’s out-of-pocket expense is reduced by the amount of the rebate, the price paid to the seller is not. In effect, the manufacturer is subsidizing the consumer’s purchase, and the full sales price is subject to sales tax.” (Source: NY Tax)
I apologize if it was unclear, but my goal was to use the numbers to show how I arrived at the taxable figure and subsequent taxes, per your question below
Line 18 and 19 come fairly close to that answer, but something is clearly wrong.
In the Final Lease section, you can see that I accurately subtract the rebate in line 2, as well as add DAS costs to land at the total lease cost of ~$25,250 that Scott posted in his original screenshot