BIM55515 | Farming: herd basis: which rule to apply
From HM Revenue & Customs · Business Income Manual
S111-S129 Income Tax (Trading and Other Income) Act 2005, S109-S127 Corporation Tax Act 2009
Where an election is in force, the herd basis rules come into operation whenever an animal enters or leaves the herd. Which rule applies will depend on the particular circumstances as follows:
When an animal comes into the herd
When an animal in the herd is disposed of, or dies
if it is replaced by another animal, see BIM55535;
If it is not replaced, then:
Replacement of the whole herd
Where an entire herd is disposed of, or dies, and the farmer acquires a new production herd of the same class: