Tesla has no right to claim back the potential future tax credit (I have not filed yet for 2017).
The calculation they provide intends to reduce the purchase price by a reasonable allowance for the vehicle use (which in my case is near 0)
So you won't have the car, and will have barely driven it ("near 0") so in reality it was a purchase and return and you think you are entitled to the tax credit at law? You might want to take a look at tax rules in general when it comes to loopholes, rebates, deductions, credits, etc. and how they are applied at law, especially in relation to
tax avoidance vs. tax evasion -- the same principles are at play when claiming a credit.
it's enough for me to substantiate my position that Tesla has no right to claim back the potential future tax credit
People can always easily justify to themselves that it's proper to evade taxes. But you need to take a step back and take a look at this objectively, since that's what Uncle Sam will do because it's not ever about substantiating it to you. It's about substantiating it to the federal government and not ending up having to pay legal and accounting fees to defend yourself and still potentially lose, and also expose yourself to potential criminal liability. I would recommend you speak to a tax lawyer or accountant before filing the form, since you will be completing it without the vehicle in your driveway and having barely driven it, if at all. You're getting free money for nothing -- you're not accelerating EV transport. In my view, it's not at all worth the money you are trying to get. Plus, if Tesla pays you back what you paid, and you never really drove the car, then you claim the tax credit, I can't see any tax judge saying that's proper. Judges are instructed to interpret the law with the intent of the legislation. We know the intent is to accelerate the advent of electric vehicles. It's not to allow you to recover money from the government for an EV you bought, barely drove, then returned. It's sure seems pretty black and white to me.
But if you are going to claim the credit, you really shouldn't have told us that here. That alone could trigger an audit and you shouldn't be too hard to find. Now if you tell us you won't be claiming it, I doubt anyone will believe it and you could still be watched to see if you claim it.