What proof of payment do I need to show for the sales tax paid?
You would need an FS-6 T receipt issued by the DMV, or obtain a Claim for Sales Tax Exemption from the leasing company and a bill of sale; or a Dealer Retail Certificate of sale MV-50 completed by the dealer located in New York state.
What needs to be on the title?
It would have to have the buyer and seller information and odometer and damage disclosure statements for all vehicles that are 10 years old or newer.