PP and E, Capex and Depreciation: Asset-Heavy vs Asset-Light Businesses
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In short
Property, plant and equipment is what the business is physically made of, and the three figures around it — the balance, the capital spending, and the depreciation charge — describe a company's relationship with its own assets.
Canonical data. Figures tie to Wexford Instruments (USD millions). Depreciation policy — methods, useful lives, capitalisation boundaries — is covered in Pillar 23; this article reads the lines those policies produce.
How much capital it takes to produce a dollar of revenue is one of the most durable facts about a business, far more stable than margins or growth, and it is mostly determined by what industry the company is in rather than by how well it is run.
The three figures and how they connect
The balance rolls forward mechanically: opening net PP&E, plus capital expenditure, less depreciation, gives closing net PP&E. Disposals and revaluations can enter, but that identity is the spine.
Capital expenditure is cash out now for capacity later, and it appears in the investing section of the cash-flow statement rather than in profit — which is why a company can be highly profitable and see its cash fall. Depreciation is the same spending arriving in profit, years later and spread out. The two are the same money seen at different times, which is what makes their ratio informative.
Capex against depreciation: the ratio that carries the signal
Depreciation is a rough proxy for what it costs to replace assets as they wear out. So comparing capital spending to it gives a crude but useful reading. Capex materially above depreciation means the company is adding capacity, replacing assets with more expensive ones, or catching up after underinvesting. Capex at or below depreciation means the asset base is being maintained or allowed to shrink — which can be efficiency, a shift to an asset-lighter model, or deferral that will have to be made up later.
The honest limitation: the statements cannot separate maintenance capex from growth capex. Companies are not required to split them, and the distinction is genuinely difficult even internally, because a replacement machine is usually better than the one it replaces. Any analysis that confidently splits the two is estimating, and should say so. This matters because the maintenance portion is the real cost of staying in business, and it is exactly what EBITDA removes.
A second limitation worth knowing: a summarised balance sheet shows PP&E net. Estimating how old the asset base is — and therefore how much replacement spending is coming — requires gross cost and accumulated depreciation, which live in the notes. Net PP&E alone cannot tell you whether you are looking at new plant or nearly-exhausted plant, and those are very different businesses.
Asset-heavy and asset-light
Revenue per unit of PP&E is a structural fact, not a performance measure. A utility, a manufacturer, and a software company will produce wildly different figures, and none is better. What the ratio does tell you is how much capital growth will consume: an asset-heavy business must spend heavily to grow, so its growth is capital-hungry and its returns are constrained by the asset base; an asset-light one can grow with little capital, which is why such businesses show high returns on capital — and also why they attract competition, since low capital requirements are a low barrier to entry.
Worked example
Worked example: Wexford's asset base (canonical figures, USD millions). The roll-forward. PP&E opened at 400.0, capital expenditure added 78.0, depreciation removed 42.0, closing at 436.0. The ratio. Capex is 1.86 times depreciation and 7.8% of revenue. Wexford is spending well above what its assets are wearing out at — consistent with adding capacity, with replacing assets at higher prices, or with catching up. The statements do not say which, and the notes and management commentary are where that answer lives. The intensity. Revenue of 1,000.0 against PP&E of 436.0 is 2.29 times; against total assets, 0.98 times. This is a capital-intensive business, which is a fact about what it does rather than about how well it does it. What it costs. That 78.0 of capital spending is why operating cash flow of 98.3 became free cash flow of 20.3. Had Wexford spent only at the depreciation rate, it would have kept 36.0 more cash and reported free cash flow of 56.3 — nearly three times as much — while adding no capacity. That trade, between cash now and capacity later, is the decision the capex line records. (Canonical figures; independently verified. Intensity ratios use closing balances.)
Frequently asked
7 questions
How does the PP&E balance move?
Opening net PP&E, plus capital expenditure, less depreciation, gives closing net PP&E. Disposals and revaluations can also enter, but that identity is the spine — and it's one of the ties that lets you check statements against each other.
What does capex above depreciation mean?
The company is adding capacity, replacing assets with more expensive ones, or catching up after a period of underinvestment. On the illustration here, capex is 1.86 times depreciation — the statements show that it's happening but not which of the three explanations applies.
Can I tell maintenance capex from growth capex?
Not from the statements. Companies aren't required to split them and the distinction is genuinely hard even internally, since a replacement machine is usually better than the one it replaces. Any confident split is an estimate and should be labelled as one.
Why does that distinction matter?
Because the maintenance portion is the real cost of staying in business — and it's precisely what EBITDA removes. A measure that adds back depreciation while the company must keep spending to replace assets overstates what's available.
Can I tell how old a company's assets are?
Not from net PP&E alone. You need gross cost and accumulated depreciation, which sit in the notes. Net PP&E can't distinguish new plant from nearly-exhausted plant, and those are very different businesses with very different spending ahead.
Is asset-light better than asset-heavy?
Neither is better — it's a structural fact about the industry. Asset-light businesses grow with little capital and show high returns on capital, which is also why they attract competition: low capital requirements are a low barrier to entry. Asset-heavy businesses need capital to grow, which constrains returns and also deters entrants.
How much does capex affect cash?
Enormously. On the illustration, 78.0 of capital spending turned 98.3 of operating cash flow into 20.3 of free cash flow. Spending only at the depreciation rate would have left 56.3 — nearly three times as much — while adding no capacity.
References
Educational and informational only — not investment advice, a recommendation, or an offer to buy or sell any security. Investing involves risk, including the possible loss of principal. Worked examples use fictional companies and figures.