BIM67435 | Waste disposal: site restoration: expenditure not allowable: provisions
From HM Revenue & Customs · Business Income Manual
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A provision for capital site restoration payments (see ) is not allowable for tax purposes. However, a provision for revenue restoration expenditure is allowable, if made in accordance with generally accepted accounting practice and sufficiently accurately quantified.
Where provisions for future site monitoring costs are allowable, the amount allowed should be discounted to reflect the fact that the expenditure may not be paid for many decades.