Queenstown Airport Corporation Limited v Commissioner of Inland Revenue

The case between Queenstown Airport Corporation Limited and the Commissioner of Inland Revenue involved the issue of tax depreciation for airport runways. The Queenstown Airport Corporation argued that the asphalt runways should be depreciated like other business assets, considering the costs of resealing and repairs. The Commissioner of Inland Revenue, however, had previously determined that such assets should not be depreciated. This led to a legal dispute over the proper tax treatment of the airport's runways. The court had to decide on the applicability of depreciation to the airport runways and the correct method of accounting for these costs in tax terms.

The central legal issue before the court was whether the airport runways qualify as depreciable assets under the Income Tax Act 1976. The court needed to determine if the runways, given their unique maintenance and repair requirements, could be depreciated over time. Additionally, the court had to interpret the nature of the expenses incurred for resealing and repairs, deciding whether these should be treated as capital expenditures to be depreciated or as operational expenses deductible in the current year. The court also needed to consider the broader legislative context, particularly the definition of depreciable property and whether it encompassed airport runways.

The court found that the airport runways could indeed be depreciated, setting the depreciation rate at 2% of the cost price. The thin reseals conducted every 3–4 years and the normal repairs were considered maintenance expenses, fully deductible in the year they were incurred. The more comprehensive reseals, occurring approximately every 15 years, were treated as part of the original construction cost and added to the depreciable base. The court's reasoning aligned with the recommendations of the Valabh Committee, which had proposed a broader definition of depreciable property, including tangible and intangible assets used in business operations. This decision was consistent with the principles of tax accounting, aiming to accurately reflect the decline in asset value over time.

The court ordered that the airport runways of Queenstown Airport Corporation Limited could be depreciated at the rate of 2% of the cost price, with the 3–4 yearly thin reseals and normal repairs treated as deductible expenses. The 15-yearly major reseals were to be added to the cost base of the runway and depreciated accordingly. This ruling provided clarity on the tax treatment of airport runways, ensuring that the depreciation method adopted was in line with both legislative intent and practical accounting standards.