This is important, so it's capped and bolded:
DO NOT LEASE IF YOU PLAN TO BUY AT LEASE END!!! YOU WILL LOSE THE TAX CREDIT!
This assumes Tesla has any credits left when you get the car, of course. Tesla leases (and many other EV leases; Volt leases are definitely done this way) handle the tax credit by artificially increasing the residual value by the tax credit, reducing the amount financed, and thus, your monthly payment. The leasing company gets less money from you, but makes it up on the credit. However, if you buy at the end of the lease, you are stuck paying the inflated residual, thereby buying a used car for $7500 more than it's worth. You'd be better off to walk away and find an identical car out on the used market.