CA90400 - Structures and buildings allowance (SBA): outline: qualifying activity - definition
CAA01/S270CA
For a building to be in qualifying use CA92100, it must be used for the purpose of a qualifying activity.
SBA is only available as a deduction for a qualifying activity. If there has not been any use for a qualifying activity during a chargeable period there can be no entitlement to SBA CA90100.
Qualifying activities for SBA are, to the extent that their profits or gains are, or (if there were any) would be, chargeable to tax in the UK, any of the following: