The two main basis for determining the ad valorem value are fair market value and current use value. The fair market value is based on the typical selling price for property on which the buyer and seller can agree, with the assumption that the property is being used or will be used at its highest and best use after the sale. The current use value is the typical selling price for property with an assumption that it will continue after the sale to be used in its current use rather than being converted to its highest and best use. State legislatures have created many variations to these two main valuation approaches.