What does an offshore wind case mean for investment in the Midlands?

Written by Matthew Greene, director at PwC UK. 

At first glance, the recent Supreme Court decision in Orsted v HMRC (often referred to as the Gunfleet Sands case) might seem remote from businesses in the West Midlands.

The case concerns offshore wind farms (including the now well-known site off the Essex coast), and specifically whether the costs of environmental surveys and early-stage studies qualify for capital allowances.

But the implications reach far beyond the energy sector and well inland.

A simple question with a complex and significant answer

The core issue before the Court was whether substantial pre-construction costs (such as environmental assessments, geotechnical surveys and design studies) could be treated as capital expenditure “on the provision of plant” and therefore attract UK tax relief through capital allowances.

Overturning the Court of Appeal's judgment, the Supreme Court concluded that, whilst these costs were clearly necessary to develop the wind farms, they were not sufficiently closely connected to the physical assets themselves to qualify for capital allowances.

In short, they were seen as preparatory or advisory in nature rather than part of actually “providing” the plant.

That distinction matters.  For many large projects, these early-stage costs are significant. Where capital allowances are unavailable, the timing and availability of tax relief may be more limited and will depend on the particular facts and expenditure in question.

Why this matters in the Midlands

You don’t need to be building a wind farm for this to be relevant. Across Greater Birmingham and the surrounding area, we are seeing continued investment in advanced manufacturing, logistics hubs, regeneration projects and infrastructure.

These developments often involve substantial upfront work - feasibility studies, planning, environmental assessments, and technical designs.

The logic behind the Supreme Court’s interpretation was not wind-farm specific, and therefore could apply equally to those projects, indicating that much of this early expenditure may not qualify for capital allowances, even where it is essential to getting a project off the ground. To the extent that no capital allowances or other reliefs are available, the after-tax cost of the project may increase.

For a business weighing up where to spend big, and particularly for international investors comparing jurisdictions, this is one of many factors in the overall commercial decision.

The UK continues to offer attractive tax incentives and reliefs in many areas; however, this decision removes part of the anticipated benefit for large-scale developments

The broader investment context

It would be wrong to view this point in isolation. The UK has a well-established framework of planning, environmental and regulatory requirements which play an important role in protecting communities, ensuring safety, and preserving our natural environment.

However, it is important to recognise that such rules and regulations are an involved part of the project lifecycle and can involve material pre-construction expenditure. 

The Orsted decision highlights that not all of that cost is recognised within the tax system. From an economic perspective, the tax treatment of these costs may be one consideration  and when combined with other commercial pressures, it may influence whether projects proceed, how they are structured, and critically, in which jurisdiction they are located.

For regions like the West Midlands - where new and established businesses alike compete for inward investment and large-scale developments - these  factors can make a difference.

Early consideration matters, now more than ever

One important aspect of the judgment is that it does not close the door entirely. Within this case, the Court acknowledged that the outcome can depend on how capital expenditure is incurred and structured - including who incurs particular costs and at what stage.

Whilst it will not always be possible to mitigate the impact, there may be circumstances where a different approach to procurement, contracting or ownership improves the overall tax position.

That places a greater emphasis on early-stage planning and businesses embarking on significant capital projects (whether greenfield developments, redevelopments or infrastructure investments) should consider these issues upfront in the context of the project’s commercial arrangements, rather than retrospectively.

Looking ahead

There has previously been discussion at Government policy level (with a consultation announced at the Autumn 2024 Budget) around the treatment of pre-development costs, and whether the current rules fully support investment. This process was paused after the Court of Appeal had ruled in favour of the taxpayer; with that decision effectively reversed, it is uncertain whether the consultation is now revisited.

In the meantime, the position set out by the Supreme Court is clear. For businesses in the Midlands and beyond, the key takeaway is not just the technical outcome of the case, but what it signals more broadly - that the boundary of tax relief for capital investment is narrower than many may have assumed over the past few years.

Understanding that boundary, and thinking ahead, will be increasingly important as the region continues to attract and deliver major projects.