CG15413 | Capital allowances made: meaning: plant and machinery
From HM Revenue & Customs · Capital Gains Manual
TCGA92/S41 (7)
Where the disposal is of plant or machinery, and allowances or charges have been made under Part II of the Capital Allowances Act 2001 and neither
CAA01/Ss205 - 208 (assets used only partly for trade purposes), nor
CAA01/Ss209 - 212 (partial depreciation subsidies)
applies, the capital allowances to be taken into account under Section 41 are to be taken as equal to the difference between
the capital expenditure incurred, or treated as incurred, under the Capital Allowances Act 2001 and
the disposal value required to be brought into account in respect of the plant or machinery.
(If CAA01/Ss205 - 208 or CAA01/Ss209 - 212 applies then CG15412 applies because the assets are not part of the main capital allowances pool.)