That's not "importing" LOL.Just get the form from your police station for licensing and registering, just as with any other car. :)
Your question is unclear. You always have to pay a tax on the purchase. They used to take your word on the price which you said you had paid. Now I believe they use a book to calculate the sales tax at registration. $
You should contact the DMV for exact info. They always seem to want another form or something that you will need!