The basic cost approach is intended to provide a uniform estimate of personal property value. It is the difference between the market value of a structural improvement or piece of equipment and its reproduction or replacement cost as of the date of valuation. Depreciation is divided into three categories, physical deterioration, functional obsolescence, and economic obsolescence. Depreciation may be further characterized as curable or incurable depending upon the difficulty or practicality of restoring the lost value through repair or maintenance. It results when the desirability or useful life of real or personal property is impaired due to forces such as changes in optimum use, legislative enactment that restricts or impairs productivity, and changes in supply and demand relationships.
Economic obsolescence is normally incurable.
It is the actual age less the age that has been taken off by face-lifting, structural reconstruction, removal of functional inadequacies, modernization of equipment, and similar repairs and overhauls. It is an age that reflects a true remaining life for the property, taking into account the typical life expectancy of buildings or equipment of its class and usage. Some functional obsolescence may be curable and some functional obsolescence may be incurable. This includes the cost of the property to the property owner, the cost of transporting the property to its present site, the cost of any on-site assembly or customized modification of the property, the cost of installing the property, the cost of installing personal fixtures and trade fixtures necessary for the proper operation of the property, and any sales or use tax paid on the property. Original cost is equivalent to original cost new if the property owner was the first to put the personal property into service.