A bill of sale helps the buyer prove their ownership of the item and gives the seller a record stating that they are no longer responsible for the sold asset. A Pennsylvania bill of sale is a receipt and legally binding document that holds both a buyer and seller liable for a transaction.A Pennsylvania Bill of Sale helps Pennsylvania residents record the sale of personal property. When selling a vehicle, the seller must sign and handprint their name on the proof of ownership document. A Bill of Sale in Pennsylvania acts as both a legally binding contract and receipt which holds the buyer and seller of an item accountable. The Pennsylvania bill of sale form acknowledges the transfer of possession of a piece of personal property for an agreedupon sum of money. A Business Bill of Sale is a legal document used to transfer ownership of a business from a seller to a buyer. A bill of sale will detail a transfer of property or sale of items between a seller and buyer. This type of document serves as legal evidence.