Concrete dry dock treated as plant, with necessary excavation costs also counted as provision of plant

A concrete dry dock could qualify as plant where, viewed as a functional unit, it operated as apparatus in the trade by separating ships from water, holding them in position, and enabling repairs; on that reasoning, it fell within the machinery-and-plant allowance. Necessary excavation expenditure incurred before the dock could be installed and used was treated as expenditure on the provision of plant, because it was a direct precursor and not too remote. The notes also record a dissent that regarded the dock basin and concrete works as a trade setting rather than plant.

---

---

Issues: (i) Whether the concrete dry dock, viewed as a whole, was "plant" within the meaning of the Income Tax Act, 1952; (ii) Whether the expenditure on excavation necessary to construct the dry dock was expenditure on the provision of machinery or plant under the Act.

Issue (i): Whether the concrete dry dock, viewed as a whole, was "plant" within the meaning of the Income Tax Act, 1952.

Analysis: The relevant distinction was not confined to whether an item was a structure or plant, because the statute contemplated overlap between the two. The dry dock had to be considered as a functional unit and not piecemeal. On that approach, it was not merely the setting in which ship repair took place: it actively separated ships from the water, held them in position, and enabled repairs to be carried out. The functional role of the dock, taken with its integral equipment, brought it within the conception of apparatus used in the trade rather than mere premises.

Conclusion: The concrete dry dock was plant and qualified for allowance under the machinery-and-plant provisions.

Issue (ii): Whether the expenditure on excavation necessary to construct the dry dock was expenditure on the provision of machinery or plant under the Act.

Analysis: Expenditure on the provision of plant was construed to include necessary preliminary expenditure incurred before the plant could be installed and used for the trade. The excavation was a necessary precursor to the provision of the dry dock and was not too remote from it. The exclusionary argument based on the provision dealing with alterations to existing buildings did not displace that construction, and the separate provision excluding land acquisition did not assist against excavation costs.

Conclusion: The excavation expenditure also formed part of the expenditure on the provision of plant and qualified for the higher allowance.

Final Conclusion: The appeal failed because the disputed dry dock expenditure was held to fall within the machinery-and-plant allowance regime rather than being confined to the lower industrial-building allowance.

Dissenting Opinion: Lord Hodson and Lord Upjohn would have treated the dry dock basin and concrete works as a structure providing the setting for the trade, not as plant. On that view, the higher allowance would not be available for the concrete works, and the excavation point would not arise or would also fail.

Ratio Decidendi: A structure may nonetheless be plant if, viewed as a whole, it functions as apparatus used in carrying on the trade; and expenditure necessarily incurred before such plant can be provided may form part of the expenditure on its provision.

---