If you are the 1% or 2% of people making a profit on a car sale, consider yourself fortunate.

If someone gives you cash for an expensive car, what happens when they sell it? What is their basis that they will be taxed on?

Best way for selling party, on death. The selling party gets the step up basis if the estate is under a certain amount.

Hire a CPA. Pay what you owe. Pretty simple.