A recent Supreme Court decision has clarified the limits of what businesses can claim as capital allowances, narrowing the scope for pre-construction and preparatory costs.
The case, Orsted West of Duddon Sands (UK) Ltd v HMRC, concerned major offshore wind farm developers, but the principles apply far more widely. For SMEs investing in equipment, infrastructure or large projects, the ruling reinforces a stricter approach to what qualifies as plant and machinery expenditure.
What the case was about
The companies involved incurred around £48 million on surveys and studies before building offshore wind farms. These included environmental assessments, seabed analysis and technical studies to determine how the projects should be designed and constructed.
HMRC accepted that the physical assets, such as turbines and cables, qualified for capital allowances. However, it rejected claims for the earlier survey and study costs.
The dispute reached the Supreme Court after conflicting decisions in earlier tribunals and the Court of Appeal.
Supreme Court decision
The Supreme Court allowed HMRC’s appeal and confirmed that the disputed survey and study costs did not qualify for capital allowances. It rejected the broader approach taken by the Court of Appeal and instead applied a stricter interpretation of the statutory wording.
The Court focused on the meaning of expenditure incurred “on the provision of plant”, concluding that this requires a close and direct link between the cost and the asset itself. While certain associated costs, such as transport and installation, can fall within this definition, earlier-stage expenditure that informs or supports decision-making does not.
In applying this narrower test, the Court drew a clear distinction between costs that result in the provision of plant and those that merely put a business in a position to proceed with a project. The latter were held to fall outside the scope of capital allowances.
Why the costs were disallowed
The Supreme Court’s reasoning centred on the degree of connection between the expenditure and the plant itself. It held that the survey and study costs, while necessary for progressing the projects, did not amount to expenditure on providing the plant.
The Court drew a clear distinction between costs that physically bring an asset into existence and those that inform decisions about whether and how that asset should be created. The studies in question, including environmental and technical assessments, were found to sit firmly in the latter category. They supported the design and planning process, but did not contribute directly to the acquisition, construction or installation of the plant.
In taking this approach, the Court rejected the idea that necessity alone is enough to bring expenditure within the scope of capital allowances. Even where costs are essential to a project, they will not qualify if they fall outside the narrow boundary of what can properly be described as being incurred on the provision of plant.
What this means for businesses
The Supreme Court has confirmed that capital allowances should be interpreted narrowly, with a clear expectation that qualifying expenditure has a direct and close connection to the asset itself.
Although the case arose from large scale offshore energy projects, the principle applies across a much broader range of business activity. For SME businesses, this draws a firmer line between costs that relate to acquiring or installing plant and those incurred at an earlier stage of a project. Expenditure on feasibility work, surveys, or professional advice, even where it is necessary to move a project forward, is unlikely to qualify if it does not directly contribute to bringing the asset into existence.
This creates a higher risk of challenge where capital allowance claims include preparatory or advisory costs. Businesses undertaking fit-outs, equipment upgrades or infrastructure projects should be particularly careful, as these types of expenditure often include a mix of qualifying and non-qualifying costs.
The decision reinforces the need for careful cost categorisation when planning investment. Businesses should separate:
- Direct asset costs, which are more likely to qualify
- Early-stage or advisory costs, which may not
- Where projects involve significant upfront work, the tax treatment should be considered early, rather than at the point of filing.
For SMEs in particular, the ruling is therefore less about wind farms and more about everyday scenarios such as property fit-outs, manufacturing equipment or technology infrastructure projects. The practical effect is that businesses need to take a more disciplined approach to cost allocation. Identifying which elements of a project genuinely relate to the provision of plant, and which sit outside that boundary, is now more important than ever.
Author
Gill Laing is a qualified Legal Researcher & Analyst with niche specialisms in Law, Tax, Human Resources, Immigration & Employment Law.
Gill is a Multiple Business Owner and the Managing Director of Prof Services Limited - a Marketing & Content Agency for the Professional Services Sector.
