Stamp Duty on the property is usually paid on the market value of the property or the selling price of the property to the buyer whichever is higher. This is charged to facilitate the processing of legal documents needed to help with the transaction involved in buying a house. These documents include the sale deed, conveyance deed, and sale agreement. It is a tax paid on any document that is needed to create, extinguish or transfer liability or rights which is why stamp duty charges are paid on all documents that constitute this responsibility.