Accelerated depreciation meaning

Accelerated depreciation describes taking larger cost deductions for an asset in earlier periods than its economic use would suggest, to bring tax relief forward and improve cash flow. It is not a defined statutory term; in UK and Irish practice it is a descriptive expression. United Kingdom (England & Wales, Scotland and Northern Ireland): tax depreciation is not deductible. Instead, accelerated relief is obtained via capital allowances under the Capital Allowances Act 2001 and HMRC practice, notably the Annual Investment Allowance (AIA), first-year allowances, and (for companies) 100% “full expensing” for main-rate plant and machinery and a 50% first-year allowance for special-rate assets. These rules accelerate timing of corporation tax or income tax deductions without increasing the overall quantum. Where acceleration is not available, writing-down allowances apply at standard rates. Ireland: depreciation is added back for tax. Acceleration is achieved through capital allowances administered by Revenue, such as 100% allowances for specified energy-efficient equipment or other targeted incentives; otherwise, standard wear-and-tear allowances apply. Accounting: “double-declining balance” and “sum-of-the-years’-digits” are accelerated depreciation methods used in financial statements where they reflect the asset’s consumption pattern, but they do not determine tax relief. Usage is broadly consistent across the UK jurisdictions.