10 to 25
Legally if you sell 1 vehicle for profit you must have a dealers license. It does not matter if it is an antique car of 1 year old car. You can however sell up to 5 cars without a license if you are not making a profit on these sales.
4 cars a year
I think 1.3 million cars.
You can sell up to five cars per year in Tennessee without a dealers license.
Six
as many as you want
100
In Alberta you are able to sell up to 4 cars per year without the need of a license. If you wish to sell more cars, you need to obtain a dealer's license.
Differs from state to state.
50
6
You can only sell 3 cars per year before needing a dealers license.