A depreciation method in which a company calculates one depreciation amount for each group of assets, such as a fleet of company cars, instead of calculating individual schedules for each asset. Large companies can save a significant amount of effort and record keeping by doing group depreciation of their assets such as office equipment, cars, and trucks. Accounting regulations require that companies depreciate the value of their large assets each year. Group depreciation commonly is used by large businesses, with more than half using this depreciation method.