To show your proof of sales tax payment, you will need to provide your lease agreement that shows you paid the sales tax and complete the Claim for Sales Tax Exemption at NY State Department of Tax and Finance DTF-803.
What would I need to do if I didn't pay the sales tax?
In that case, you would need to provide DMV with your lease agreement and complete Statement of Transaction at NY State Department of Tax and Finance DTF-802. Then, you would need to pay the sales tax at a DMV office for any lease payments, if your leasing company didn't collect the sales tax.
What do I need to register my vehicle in New York?