IBA: Qualifying trade: Maintaining or repairing goods or materials
Repairing goods or materials is treated as subjecting goods or materials to a process and so is a qualifying trade unless the goods or materials are used by the person who repairs them in a trade which is not a qualifying trade.
Example Cassandra runs a taxi business. It is a qualifying trade because it is a transport undertaking. She has a workshop in which she repairs and maintains the taxis. The workshop qualifies for IBA because Cassandra uses the goods that are repaired and maintained there in a qualifying trade. If Cassandra gets bored with the taxi business and starts to hire out the cars without drivers her business stops being a transport undertaking and is no longer a qualifying trade. At that point the workshop stops qualifying for IBA because it is used by Cassandra to repair cars that she uses in a non-qualifying trade.