If it's a lease, you only pay taxes on your monthly payment. It's already calculated into your lease payment every month. It's not like buying the car or financing it where then sales tax is charged all at once.
I suggest you visit the "Buying and Leasing" part of this site. There is plenty of priceless information there. You can also post this question there :
http://www.e90post.com/forums/forumdisplay.php?f=95