Taxation of Chargeable Gains Act 1992

10 (1) For the purposes of this Part of this Schedule, the current use value of an interest in land shall be ascertained in accordance with the following provisions of this Part, and in this Part the time as at which current use value is to be ascertained is referred to as “the relevant time”.

(2) Subject to the following provisions of this Part of this Schedule, the current use value of an interest in land at the relevant time is the market value of that interest at that time calculated on the assumption that it was at that time, and would continue to be, unlawful to carry out any material development of the land other than any material development thereof which, being authorised by planning permission in force at that time, was begun before that time.

In relation to any material development which was begun before 18th December 1973 this sub-paragraph shall have effect with the omission of the words from “other than” to “before that time”.

(3) In this paragraph “planning permission” has the same meaning as in the [1990 c. 8.] Town and Country Planning Act 1990, or, in Scotland, the [1972 c. 52.] Town and Country Planning (Scotland) Act 1972, or, in Northern Ireland, the [S.I. 1991/1220 (N.I.11)] Planning (Northern Ireland) Order 1991, and in determining for the purposes of this paragraph what material development of any land was authorised by planning permission at a time when there was in force in respect of the land planning permission granted on an outline application (that is to say, an application for planning permission subject to subsequent approval on any matters), any such development of the land which at that time—

(a) was authorised by that permission without any requirement as to subsequent approval; or

(b) not being so authorised, had been approved in the manner applicable to that planning permission,

but no other material development, shall for those purposes be taken to have been authorised by that permission at that time.

(4) Where the value to be ascertained is the current use value of an interest in land which has been disposed of by way of a part disposal of an asset (“the relevant asset”) consisting of an interest in land, the current use value at the relevant time of the interest disposed of shall be the relevant fraction of the current use value of the relevant asset at that time, calculated on the same assumptions as to the lawfulness or otherwise of any material development as fall to be made under this Part in calculating the current use value at that time of the interest disposed of.

(5) For the purposes of sub-paragraph (4) above “the relevant fraction” means that fraction of the sums mentioned in paragraph (6) below which under subsection (2) of section 42 is, or would but for subsection (4) of that section be, allowable as a deduction in computing the amount of the gain accruing on the part disposal.

(6) The sums referred to in sub-paragraph (5) above are the sums which, if the entire relevant asset had been disposed of at the time of the part disposal, would be allowable by virtue of section 38(1)(a) and (b) as a deduction in computing the gain accruing on that disposal of the relevant asset.

(7) Sub-paragraphs (4) to (6) above shall not apply—

(a) in the case of a disposal of an interest in land by way of a part disposal if, on making the disposal, the person doing so no longer has any interest in the land which is subject to that interest; or

(b) in a case to which the following provisions of this paragraph apply.

(8) In computing any gain accruing to a person on a part disposal of an interest in land resulting under subsection (1) of section 22 from the receipt as mentioned in paragraph (a), (c) or (d) of that subsection of a capital sum, the current use value at the relevant time of the interest out of which the part disposal was made shall be taken to be what it would have been at that time if the circumstances which caused the capital sum to be received had not arisen.