462.This section is based on section 46(1) to (4) and (8) of CAA 1990. It recovers allowances if:
expenditure is allocated to a pool with writing-down allowances at 25%; but
it becomes clear in a later chargeable period that this Chapter applies to that expenditure.
463.The section broadly withdraws the difference between:
any first-year allowances plus writing-down allowances at 25%; and
allowances at 10%.
464.It does so by imposing a balancing charge and requiring a disposal value. In broad terms:
the balancing allowance recovers the excess of allowances made over what would have been made at 10%; and
the disposal value takes out of the pool the residue of qualifying expenditure in the pool on which future allowances would otherwise be made at 25%.
465.But in the next chargeable period it allocates to an appropriate pool the total of the allowances withdrawn and the expenditure taken out of the original pool. The net effect of this is broadly that the expenditure is still relieved in full but at a slower rate – as it would have been if the 10% rate had applied from the outset.