A Pennsylvania vehicle bill of sale is a legal document formalizing the sale and purchase of a motor vehicle between a buyer and seller. The Pennsylvania bill of sale form acknowledges the transfer of possession of a piece of personal property for an agreedupon sum of money.A Pennsylvania bill of sale documents the transfer of ownership of a motor vehicle, boat, gun, or other valuable asset. A bill of sale is a legal document that outlines the purchase of property between a buyer and seller. It commonly includes both parties' information. Customize and Download this "Bill Of Sale With Payment Plan". Private Car Sale Installment Agreement ✓ easily fill out and sign forms ✓ download blank or editable online. For those ready to complete a transaction, a simple click on the button below will get you started on filling out the necessary Bill of Sale form. Mention the amount for the down payment and the date on which it is due in the second and third blank spaces provided under Section 4. Monthly Payment Plan Frequently Asked Questions.