It's not a trade in. The dealer is not trading the car. VW is buying the vehicle back. Would I be able to apply for a sales tax refund ,for the purchase price difference, if I sold my car and then walked into a Dealership to buy a new car?
It depends on your State's Department of Revenue policy. In Missouri, there is a form called Notice of Sale or Transfer (
http://dor.mo.gov/forms/5049.pdf). I called local Motor Vehicle and was told that if I paid tax on the TDI, and then I sell it (including buyback), I have already paid sales tax (more than 7% here), and if I buy another car, I ONLY pay sales tax on the difference between buyback and sale price of the new car. You do not have to call it a "trade-in". Again, you only pay sales tax on the difference...
The sale (or buyback) of the TDI, and the purchase of a different car: DOES NOT have to be done at the same dealer, includes private transactions, AND you have 6 months to do it.
It is NOT clear whether that means the clean trade-in, or the total with restitution. Frankly, I don't think MO DOR wants to split hairs. They will very likely just allow the deduction for the full buyback amount.
Oh, and that form is available for MO residents that have an old title that does not have this form as a perforated tear-off on the issued title (same form, same name- comes with newer titles).
Other States have similar policy, but the key in some cases appears to be that you can demonstrate that you paid sales tax on the TDI (it is on your first registration form).