BIM60630 | Profits from a trade of dealing in or developing UK land: Profit attributable to period before intention to develop formed

From HM Revenue & Customs · Business Income Manual

It is possible that when land is acquired the intention was not to realise a gain from its disposal, but subsequently this intention changes. The treatment of situations where the intention has not always been to deal in or develop the land is set out in and .

Where condition D applies (because the land has been developed with a purpose of realising a gain and the initial intention was not to realise a gain from its disposal), only the profits relating to the period after the intention to develop should be taxed.

The apportionment between the two periods should be made on a just and reasonable basis. What is just and reasonable will vary depending on the facts of the case.