Capital allowances remain one of the most valuable corporation tax reliefs available to UK businesses investing in commercial property or plant and machinery. Yet, despite their potential to achieve significant tax savings, claims are often underutilised, incorrectly applied, or worse, lost completely due to timing issues or poor compliance.

At CapexOwl, we bring together corporation tax specialists and quantity surveyors to ensure every qualifying pound of expenditure is identified, documented, and claimed. This unique combination of skills is critical when navigating both the complexity of the tax legislation and HMRC’s scrutiny of claims.

“When it comes to claiming capital allowances, timing is everything.”

The Importance of Timing in Capital Allowances

When it comes to claiming capital allowances, timing is everything. Relief is only available when expenditure is “incurred,” and that timing dictates:

  • Which accounting period the claim falls into.
  • How much relief can be claimed.
  • Whether certain allowances are permanently lost.

Key Timing Considerations

1. Date of Expenditure
  • The date is generally when there is an unconditional obligation to pay, not necessarily when the asset is delivered or installed.
  • For staged payments (e.g., construction projects), timing follows the contract and payment milestones.
2. Annual Investment Allowance (AIA)
  • AIA gives 100% relief up to £1m per year. Getting the timing right can ensure expenditure falls within the same accounting year, maximising upfront tax relief.
3. Disposals and Balancing Adjustments
  • Selling a property with fixtures can trigger balancing charges if timing and elections aren’t carefully managed.
4. Retrospective Claims
  • Capital allowances can sometimes be claimed on historic expenditure, but the window is limited by tax return deadlines and compliance requirements.

Missing the right timing can lead to reduced relief, or no relief at all.

HMRC Enquiries: What to Expect

HMRC does not oppose capital allowance claims; in fact, they expect businesses to claim them. But they do closely scrutinise how claims are prepared.

Common HMRC Challenges

  • Over-generalised claims: Claims based on broad percentages of costs without supporting analysis.
  • Incorrect classifications: Structural items incorrectly treated as qualifying fixtures.
  • Lack of documentation: No breakdown of composite contractor invoices into qualifying and non-qualifying expenditure.
  • Fixtures disputes: Failure to properly execute elections between buyers and sellers in property transactions.

A poorly prepared claim may not only be reduced but could also trigger wider enquiry into a company’s corporation tax affairs. CapexOwl mitigates this risk by producing detailed, HMRC-compliant reports with clear evidential support.

Corporation Tax Reliefs and the Role of Capital Allowances

Corporation tax is charged on the taxable profits of UK companies. From April 2023, the main rate is 25% for profits over £250,000, with a small profits rate of 19% and marginal relief in between.

Capital allowances provide one of the most direct ways to reduce these profits. For businesses investing heavily in property or equipment, the relief can be substantial:

  • Plant & Machinery Allowances (PMA): Relief on business assets like production equipment or IT systems.
  • Integral Features: Electrical systems, heating, and lifts within buildings.
  • Annual Investment Allowance (AIA): Up to £1m of qualifying spend written off immediately.
  • Full Expensing (for Companies only): 100% tax relief on qualifying spend, which can be useful where a company has fully used the AIA.
  • First-Year Allowances (FYA): Enhanced relief on certain energy-efficient assets and integral features.
  • Structures and Buildings Allowance (SBA): Relief on construction costs of non-residential buildings.

When applied correctly, these reliefs reduce corporation tax liabilities, improve cash flow, and shorten investment payback periods.

Why Use a Specialist Like CapexOwl?

1. Dual Expertise: Tax + Surveying

Most capital allowance claims fail because they lack one of two critical perspectives:

  • Corporation tax knowledge: Understanding how allowances interact with wider tax reliefs and the company’s tax position.
  • Quantity surveying expertise: Breaking down construction and acquisition costs into qualifying components.

CapexOwl brings both together. Our tax experts and surveyors collaborate to ensure claims are maximised and defensible.

2. Maximising Relief

Generic claims often capture the obvious items (like loose plant and machinery) but miss embedded fixtures within buildings. Our surveying approach regularly identifies 20–40% more qualifying expenditure than a standard review.

3. HMRC Compliance

Our reports are prepared in line with tax legislation and HMRC guidance, with clear categorisation, methodology, and evidence. This reduces the risk of enquiry and ensures claims withstand scrutiny.

4. Strategic Tax Planning

We align capital allowance claims with broader corporation tax strategy, factoring in loss reliefs, group structures, and timing of disposals.

Final Thoughts

Capital allowances are a cornerstone of UK corporation tax relief, but they are highly technical. Timing of expenditure, accuracy of classification, and the quality of supporting documentation all determine whether relief is maximised—or lost.

By combining the expertise of corporation tax professionals with the practical skills of quantity surveyors, CapexOwl ensures clients obtain every available allowance while remaining fully compliant with HMRC.

For businesses investing in commercial property or plant, the message is clear: don’t leave money on the table.

Ready to strengthen your capital allowance strategy?
Contact CapexOwl today for a free review and see how much tax relief could be hidden in your expenditure.