What Is CapEx vs. OpEx?
Key Takeaways
- CapEx is spending on long-term assets; OpEx is spending on day-to-day operations.
- CapEx is capitalised on the balance sheet and depreciated over time; OpEx hits the P&L immediately.
- The distinction affects both tax treatment and how investors read your profitability.
- SMEs should forecast CapEx separately to understand its cash flow impact.
The core distinction
Capital expenditure (CapEx) refers to spending on assets that will be used for more than one year — machinery, vehicles, computer equipment, leasehold improvements, or software licences that meet the capitalisation threshold. Operating expenditure (OpEx) refers to the day-to-day costs of running the business — salaries, rent, utilities, consumables, and software subscriptions. The distinction matters because the two types of spending are treated differently in accounting, taxation, and financial analysis, and they have different cash flow profiles.
How each type of spending flows through the accounts
OpEx hits the profit and loss statement in the period it is incurred — a £5,000 monthly software bill reduces profit by £5,000 that month. CapEx, by contrast, is capitalised on the balance sheet as an asset and then depreciated or amortised over its useful life. A £60,000 piece of equipment capitalised with a five-year life reduces profit by £12,000 per year through depreciation, rather than £60,000 in the year of purchase. This means CapEx smooths the P&L impact of large purchases, but the full cash outflow happens upfront — which is why CapEx planning is crucial for cash flow forecasting.
Tax implications for SMEs
In the UK, the Annual Investment Allowance (AIA) allows businesses to deduct the full cost of most qualifying CapEx in the year of purchase for tax purposes, rather than following the accounting depreciation schedule. This creates a timing difference: the accounting treatment spreads the cost over several years, but the tax deduction may be available immediately. Understanding this distinction helps SME owners time capital purchases to maximise the tax benefit in years of high profitability. Always take advice from your accountant on specific CapEx decisions, as the rules are detailed and change periodically.
Forecasting CapEx and its cash impact
CapEx should be forecast separately from OpEx in your financial plan. Create a CapEx schedule that lists each planned capital purchase, its cost, the expected payment date, and the depreciation period. The cash impact appears in full in your cash flow forecast at the point of payment, regardless of how it is depreciated in the P&L. Many SMEs underestimate CapEx requirements and are caught short when replacement assets are needed. Maintaining a rolling CapEx forecast — with a view of asset ages and replacement schedules — prevents these surprises and allows you to plan financing arrangements in advance.