Preliminary
16. Subject to Sections C and D of this Part of this Schedule, the amounts to be included in respect of all items shown in a company's accounts must be determined in accordance with the rules set out in this Section.
Fixed assets (paras. 17-24)
General rules
(1) The amount to be included in respect of any fixed asset must be its purchase price or production cost.
(2) This is subject to any provision for depreciation or diminution in value made in accordance with paragraphs 18 to 20.
Rules for depreciation and diminution in value
18. In the case of any fixed asset which has a limited useful economic life, the amount of -
(a) its purchase price or production cost, or
(b) where it is estimated that any such asset will have a residual value at the end of the period of its useful economic life, its purchase price or production cost less that estimated residual value,
must be reduced by provisions for depreciation calculated to write off that amount systematic
…