Splitting capital and revenue expenditure

Getting the distinction between capital and revenue expenditure right is one of the most important decisions you’ll make for your business finances. Get it wrong, and you could face an unwelcome surprise from HMRC—or miss out on tax relief you’re entitled to claim. In this post, we’ll walk you through the key differences and show you how to classify your spending correctly.

What’s the difference?

Capital expenditure is money you spend on assets that will benefit your business over several years. Revenue expenditure, on the other hand, is spending on day-to-day running costs—items that are consumed or used up more or less immediately.

The distinction matters because:

• Revenue expenditure is usually tax-deductible in the year you incur it
• Capital expenditure cannot be written off in full against profits; instead, you claim capital allowances over time

For example, buying a photocopier is capital expenditure. The ink and paper for it is revenue expenditure.

The HMRC test

HMRC uses a straightforward question: does the expense create an asset that endures for the benefit of the business beyond the current accounting period? If yes, it’s likely capital. If it’s purely for keeping the business running day-to-day, it’s revenue.

This sounds simple, but borderline cases exist. Repairs and improvements are a common area of confusion. Generally, repairs are revenue expenditure—you’re restoring an asset to its previous condition. Improvements or additions that enhance the asset beyond its original condition are capital. For instance, repainting your office is a repair (revenue), but adding an extension is an improvement (capital).

Another useful test is the “identifiable asset” test. If your spending results in a clear, identifiable asset (machinery, vehicles, buildings, software licences), it’s capital. If it doesn’t, it’s likely revenue.

Capital allowances: how they work

If you’ve correctly identified something as capital expenditure, don’t worry—you can still get tax relief through capital allowances. These allow you to deduct the cost of certain assets from your taxable profits over time.

For the 2024/25 tax year, the main rates are:

• Plant and machinery: 18% per annum (writing down allowance)
• Special rate pool (integral features, thermal insulation): 8% per annum
• Annual Investment Allowance (AIA): Up to £1,000,000 in a 12-month period on most plant and machinery

The AIA is particularly useful for smaller businesses. If your capital expenditure on qualifying plant and machinery is under £1 million in the year, you can claim the full amount as a deduction. Once you exceed £1 million, the excess falls into the main pool and receives the 18% allowance.

Software and computer equipment can also qualify for capital allowances, provided they’re not integral to the building. This is a common area where businesses miss opportunities for relief, so it’s worth reviewing.

Common pitfalls to avoid

One mistake we see regularly is conflating essential maintenance with capital improvements. A new boiler replacing a broken one? Revenue. A boiler upgrade to a more efficient model that wasn’t strictly necessary? Arguably capital, depending on the circumstances.

Another is underestimating the value of acquisition costs. When calculating the capital cost of an asset, don’t just think of the purchase price. Include legal fees, delivery, installation, and professional fees. These all add to the capital cost and therefore to your available allowances.

Finally, be cautious with secondhand or refurbished assets. They attract capital allowances in the same way as new ones, but you need proper documentation to prove the cost and nature of the expenditure to HMRC.

Documentation is key

Whether you’re claiming revenue or capital relief, HMRC will want evidence. Keep invoices, quotes, and receipts. For larger purchases, retain correspondence showing what the asset is and what it’s for. If you’ve had to make a judgment call on classification, a note explaining your reasoning is helpful should HMRC query it.

Conclusion

Correctly splitting capital and revenue expenditure isn’t just good accounting practice—it’s essential for maximising your tax relief and staying compliant with HMRC. When in doubt, ask yourself: does this create an asset that lasts beyond this year? If yes, it’s capital.

Many businesses find this area genuinely tricky, especially as they grow and expenditure becomes more complex. If you’re unsure about how to classify a particular expense, or whether you’re claiming all available capital allowances, we’d recommend getting specialist advice sooner rather than later.

For tailored advice, contact Severn Accounting — we’re here to help.