Capital expenditures (CapEx) are funds a company spends to buy, upgrade or extend the life of long-term assets — buildings, machinery, vehicles, software. Unlike everyday expenses, CapEx is not fully deducted in the year it happens: the asset lands on the balance sheet and is depreciated over its useful life. This guide covers the formula analysts use to derive CapEx, the CapEx/OpEx boundary and why companies fight over it, growth vs maintenance CapEx, capital intensity by industry, and how the number flows into free cash flow and valuation.
The CapEx formula
When the cash flow statement does not state it directly, analysts derive it from the balance sheet:
CapEx = ΔPP&E (this year − last year) + Depreciation for the year
The logic: property, plant & equipment fell by depreciation during the year, so whatever growth remains on top of that must have been new investment. Worked: PP&E rose from $800K to $920K while the year’s depreciation was $150K → CapEx = 120 + 150 = $270K. In published cash flow statements the line usually appears in investing activities as “purchases of property, plant and equipment” — the biggest recurring item in the section explained in operating activities‘ companion, investing activities.
CapEx vs OpEx — why the line matters
| CapEx | OpEx | |
|---|---|---|
| What | Buy/extend a long-term asset | Run the business day to day |
| Accounting | Capitalized, depreciated over years | Expensed immediately |
| Examples | New warehouse, fleet trucks, major software build | Rent, salaries, repairs, subscriptions |
| Profit impact | Spread over the asset’s life | Hits this year’s P&L in full |
| Cash impact | Full outflow now | Outflow as incurred |
The boundary is a judgement call with real consequences. Capitalizing a cost moves it off this year’s income statement — so aggressive capitalization flatters current profit. The infamous historical example: WorldCom capitalized billions of ordinary network line costs, manufacturing fake profit until the fraud collapsed. Repairs vs improvements is the everyday version: fixing a roof leak is OpEx; replacing the roof and extending the building’s life is CapEx. Auditors probe the line precisely because managers have incentives to push it.
Growth CapEx vs maintenance CapEx
Investors split CapEx into maintenance (keeping current capacity running) and growth (building new capacity). Companies rarely disclose the split, so the standard proxy is depreciation: spending roughly at depreciation levels ≈ maintaining; spending far above it ≈ expanding. The split matters because free cash flow — the basis of valuation — should really charge only maintenance CapEx against today’s earnings power; growth CapEx is investment in tomorrow’s. A company spending 3× depreciation is either building an empire or hiding required maintenance in the growth story — the analyst’s job is telling which. Measure the return that spending must earn with the ROI calculator:
Capital intensity — reading business models
CapEx ÷ Revenue reveals what kind of machine a business is:
| Sector | Typical CapEx/Revenue |
|---|---|
| Telecoms, railroads, utilities | 15-20%+ |
| Manufacturing | 5-10% |
| Retail | 2-5% |
| Software / services | Often under 5% |
Neither end is “better” — but high capital intensity means growth must be bought with cash before it pays, which is why asset-light businesses command higher valuation multiples and why data-center buildouts turn software companies suddenly capital-hungry. The accumulated result of years of CapEx sits in one balance-sheet line, unpacked in accumulated depreciation, and the method choice that spreads CapEx into profit — straight-line vs accelerated — is covered in double declining balance.
CapEx in free cash flow and valuation
Free cash flow = Operating cash flow − CapEx. This single subtraction is why CapEx dominates valuation debates: two companies with identical profits but different capital intensity produce very different free cash flow, and it is free cash flow that a DCF valuation discounts. When management guides “elevated CapEx for the next two years,” analysts immediately cut near-term FCF estimates — and then argue about whether the spending is maintenance in disguise. The projected version of all this lives in pro forma financial statements, where the CapEx assumption quietly drives half the model.
How analysts forecast CapEx
Three methods, in increasing order of effort. Percent of revenue: take the historical CapEx/revenue ratio and project it forward — quick, and adequate for stable businesses. Depreciation-anchored: assume maintenance CapEx ≈ depreciation, then layer announced growth projects on top — better for expanding companies. Driver-based: model the actual assets — stores to open × cost per store, capacity to add × cost per unit — the method deal models and pro forma statements deserve. In all three, management guidance (“we expect capital expenditures of $X-Y billion”) anchors the near year; the analyst’s real judgement is whether “growth” spending is truly optional or maintenance wearing a costume.
Is CapEx an expense on the income statement?
Not directly — it is capitalized on the balance sheet, then reaches the income statement gradually as depreciation over the asset’s useful life.
Where do I find CapEx in financial statements?
In the investing section of the cash flow statement, usually labelled purchases of property, plant and equipment.
Is software development CapEx or OpEx?
It depends: building a long-lived internal system is often capitalized, while routine SaaS subscriptions are OpEx. Standards give criteria, but judgement is involved.
What is negative CapEx?
CapEx itself cannot be negative, but net CapEx can appear negative when asset sales exceed purchases in a period.
What is the difference between CapEx and depreciation?
CapEx is the cash spent on assets now; depreciation is the accounting allocation of past CapEx into expense over time. Comparing the two approximates whether a company is growing or just maintaining.
Why do investors prefer asset-light businesses?
Lower CapEx means more operating cash converts to free cash flow, growth costs less cash upfront, and returns on capital run higher — which markets reward with higher multiples.