A New York boat bill of sale is a document recording the sale of a boat between a seller and a buyer. The completed form will include a description of the watercraft, the purchase price, and both parties' signatures.Instructions. The new owner's social security number, taxpayer identification number (TIN), or federal employer identification number (EIN) is required. If you're purchasing or selling a boat in New York, use a NY Boat Bill of Sale to prove a transfer of ownership has occurred. Owner states that this boat is sold free and clear of any liens, bills or encumbrances of any nature except as stated below. Use the Sales Tax Paid in Another State {Sales Tax Form} (PDF) (DTF-804) form to claim credit for the state and local sales taxes you paid in the other state.