Hi:if i win the car auction,do i need add tax on auction close price?
Tax for what? Sales tax?
Usually the state Department of Motor Vehicles will deal with all that.
But you might want to look online in your state and see what it says and get some needed forms.
Some dealers add all kinds of extra fees, after auction close. You may be surprised at those add-ons.
However, the good side is: eBay vehicle auctions are nonbinding. That means either party can walk away from the "deal".
Inspect the vehicle BEFORE bidding, and ask the dealer or seller your questions then.
A great place for quick answers; no waiting, no voting,
"Do It Yourself": eBay Customer Support .
You might want to read these two posts. They have good information.