tax depreciation
noun[U]
TAX,ACCOUNTINGukusanamountrelatingto thereducedvalueof a company'sassetsthat issubtractedfromitsprofitsinordertoreducetheamountoftaxthat itpays:
Currenttaxdepreciationresultsincompanies'writing off'assetssubstantiallybefore they have come to the end oftheirusefullife.