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HMRC internal manual

Capital Allowances Manual

HM Revenue & Customs
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MEA: Allowances and charges: Balancing allowances: pre-trading expenditure

Pre-trading expenditure on machinery or plant within CAA01/S402 and exploration and access within CAA01/S401 is relieved by way of a balancing allowance on trade commencement (CAA01/S426).

Where, however, exploration and access continues after the commencement of trading then qualifying expenditure is initially relieved by way of writing down allowances.