Capital Expenditure (CapEx)

What it is

Capital expenditure is money a company spends on long-lived physical assets — factories, machinery, vehicles, data centres, pipes, aircraft. Unlike operating expenses (which hit the P&L immediately), CapEx is capitalised on the balance sheet as an asset and then depreciated over the asset's useful life.

It sits in the cash flow statement under "investing activities" and is the primary bridge between EBITDA and free cash flow. Ignore CapEx and you're looking at an incomplete picture of how cash-generative the business really is.

Maintenance CapEx vs growth CapEx

This distinction is central to proper analysis.

Maintenance CapEx (also called "stay in business" CapEx) is the minimum spend required to keep existing assets operational. A pipeline company that doesn't maintain its pipes eventually has no pipes. An airline that doesn't replace aging aircraft eventually has no fleet. Maintenance CapEx is a genuine cost of being in business — it's why Warren Buffett criticised the EBITDA metric for ignoring depreciation.

Growth CapEx is investment in new capacity — a new factory, a new data centre, new store openings. This is discretionary investment made because management believes the returns justify the outlay. In an expanding business, growth CapEx can exceed maintenance CapEx, making total CapEx look very high even though the underlying maintenance requirement is modest.

The difficulty: companies rarely disclose the split explicitly. Analysts typically estimate maintenance CapEx as being in line with reported depreciation, though this is imperfect for businesses with rapidly changing asset bases.

CapEx intensity and investment quality

Low CapEx intensity = high free cash flow relative to earnings. This is the hallmark of an "asset light" business model: software, professional services, consumer brands with outsourced manufacturing. These businesses can grow with minimal incremental investment.

High CapEx intensity means the business must continuously reinvest large portions of its earnings to maintain and grow. Telcos, utilities, airlines, and manufacturers face this reality. High CapEx is not inherently bad — if the returns on that investment are attractive — but it does constrain the cash available for dividends, buybacks, and debt reduction.

The framework: compare CapEx as a percentage of revenue and EBITDA across several years. A business spending 3–5% of revenue on CapEx and 15–25% of EBITDA is relatively capital-light. One spending 20%+ of revenue and 60%+ of EBITDA is highly capital-intensive.

CapEx cycles and the value trap

Capital-intensive industries are prone to value traps around peak CapEx cycles. A company might announce a major infrastructure programme — a new production facility, a fleet renewal, a network upgrade — that will depress free cash flow for 3–5 years but generate superior returns thereafter.

The investment case rests on: do you believe the returns will materialise? If yes, the stock can look expensive on current FCF but cheap on normalised post-CapEx FCF. If the returns disappoint (cost overruns, market demand doesn't materialise, technology changes), the capital was destroyed.

UK examples: BT's fibre rollout, National Grid's grid upgrade programme, EDF's Hinkley Point C nuclear investment. In each case, near-term free cash flow is depressed by major capital investment programmes. The investment case depends on long-term return assumptions.

CapEx and the cash flow statement

Always read CapEx from the cash flow statement, not the notes. The cash flow statement shows actual cash spent in the period; the income statement's depreciation charge shows accounting amortisation of past investment.

When a company is frequently stating its CapEx "guidance" in the operating metrics rather than the cash flow statement — particularly with extensive adjustments — be alert. Management may be presenting a flattering version of investment spend.

Not financial advice. CapEx analysis is essential for any thorough business evaluation, particularly in capital-intensive industries.