CapEx vs OpEx: What Investors Need to Know

Capital expenditure (CapEx) is money spent on long-lived assets like property and equipment, recorded on the balance sheet and expensed slowly through depreciation. Operating expenditure (OpEx) is day-to-day running cost expensed in full immediately. The split matters because it changes reported profit, and because only CapEx is subtracted when calculating free cash flow.

Two companies can spend exactly the same amount of cash in a year and report wildly different profits, purely because of how that spending is classified. Understanding the line between CapEx and OpEx is one of the quickest ways to see through reported earnings to the cash underneath.

Where this fits: the CapEx and OpEx split runs across all three statements and is the bridge between the income statement and free cash flow. Capital intensity is central to judging a great business under Criterion 1 of the Five Criteria.

The Core Distinction

The difference comes down to how long the benefit of the spending lasts.

• Capital expenditure (CapEx) buys an asset expected to generate value for more than a year: a factory, a fleet of vehicles, machinery, computer hardware or sometimes capitalised software. Because the benefit is long-lived, the cost is placed on the balance sheet and expensed gradually through depreciation over the asset’s useful life.

• Operating expenditure (OpEx) is the cost of running the business this period: wages, rent, raw materials, marketing, utilities and repairs. The benefit is used up quickly, so the whole cost is expensed immediately on the income statement.

The cash leaves the building either way. The difference is purely about timing: when the cost shows up as an expense against profit.

	CapEx	OpEx
What it buys	Long-lived assets	Day-to-day resources
Balance sheet	Capitalised as an asset	Not capitalised
Income statement	Expensed slowly via depreciation	Expensed in full now
Cash flow statement	Investing section	Operating section
Effect on current profit	Smaller immediate hit	Full immediate hit

Why the Split Changes Reported Profit

Here is the part that trips people up. Because CapEx is expensed slowly and OpEx all at once, the choice of where to draw the line shifts profit between years.

Imagine a company, Company D, spends £100m upgrading its systems. (This example is hypothetical.) If it treats the spend as OpEx, the full £100m hits this year’s profit. If it capitalises the spend and depreciates it over ten years, only £10m hits profit this year and the remaining £90m is spread across the next nine. Same cash, very different reported earnings.

This is why capitalisation policy matters. A company that capitalises aggressively, pushing costs onto the balance sheet rather than the income statement, can report higher current profit than a more conservative rival doing exactly the same thing. Over the full life of the asset the totals match, but in any single year the picture can be flattered.

Where this becomes a red flag

Watch for companies that suddenly start capitalising costs they used to expense, especially things like software development, customer acquisition or routine maintenance. A rising share of capitalised costs alongside improving margins is a classic earnings quality warning and belongs on any investor’s list of red flags. It can make profit look better while cash generation quietly stays the same or worsens.

CapEx, Depreciation and Free Cash Flow

This is the most practical reason the distinction matters. Free cash flow is the cash a business produces after the investment it needs to keep running. The standard calculation is:

Free cash flow = Operating cash flow − Capital expenditure

Notice two things. First, it subtracts actual CapEx, the real cash spent on assets this year. Second, operating cash flow has already added back depreciation, because depreciation is a non-cash charge; the cash went out when the asset was originally bought.

So the income statement charges depreciation (an estimate of past spending) while free cash flow charges current CapEx (actual spending today). For a stable business the two are similar. But they diverge in two important cases:

• A growing, capital-heavy business spends more on CapEx than its current depreciation, because it is adding capacity. Its free cash flow is lower than profit suggests.
• A shrinking or underinvesting business spends less on CapEx than depreciation, which temporarily flatters free cash flow but stores up trouble as assets wear out.

This gap is exactly why free cash flow matters more than profit. Profit can be managed through capitalisation choices and depreciation assumptions. Cash spent on real assets cannot.

Maintenance Capex vs Growth Capex

Not all CapEx is the same, and this is where real insight lies. Total CapEx has two parts:

• Maintenance capex is what a company must spend simply to keep its existing assets and current level of output intact: replacing worn machinery, refreshing vehicles, maintaining buildings.
• Growth capex is discretionary spending to expand: new factories, extra capacity, entry into new markets.

The distinction matters because maintenance capex is unavoidable, while growth capex is a choice. A business that must plough most of its cash flow back just to stand still is a poor one, whatever its headline profit. A business that can grow while spending little is a wonderful one.

Warren Buffett built his admiration for certain businesses on exactly this idea. He has long preferred companies that need little reinvestment to maintain their earning power, because the cash they throw off can be returned to owners or redeployed at high returns. Companies that must constantly feed capital into ageing assets, by contrast, are what he called businesses where the cash is “restricted” rather than free.

How to estimate it

Companies rarely split the two out, so you have to approximate. A common rough method:

1. Compare total CapEx with depreciation over several years. If CapEx consistently tracks depreciation, most of it is probably maintenance.
2. Treat CapEx above the level of depreciation, in periods when capacity is expanding, as growth capex.
3. Cross-check against what management says about expansion projects in the annual report.

It is an estimate, not a precise figure, but even a rough split transforms your understanding of how much cash a business really produces for its owners.

Capital Intensity and Business Quality

The amount of capital a business must tie up to operate is one of the clearest markers of quality, and it runs straight into return on invested capital.

Business type	Capital intensity	Typical CapEx pattern
Software / asset-light services	Low	Small CapEx, high free cash flow conversion
Consumer brands	Low to moderate	Modest CapEx relative to profit
Retail	Moderate	Store fit-outs and refreshes
Manufacturing	High	Heavy plant and equipment
Utilities / telecoms / heavy industry	Very high	Constant large reinvestment

Capital-light businesses have a structural advantage: they can grow without swallowing cash, so more of their profit becomes free cash flow and their returns on invested capital stay high. Capital-heavy businesses can still be good investments, but only if they earn strong returns on the capital they must deploy and are bought at a sensible price, as our guide on different business models explores.

This does not mean capital-heavy businesses are automatically bad. A regulated utility or a well-run industrial can be a sound holding. But you must set a higher bar: the returns on all that capital have to justify it, and the balance sheet has to be strong enough, under Criterion 4, to fund the reinvestment through a downturn.

How I Use the CapEx vs OpEx Lens

When I analyse a company, I run a short CapEx routine:

1. Pull five to ten years of CapEx and depreciation. The relationship between them tells me how much the business must reinvest and whether it is in a growth or steady phase.
2. Calculate CapEx as a percentage of sales. Stable and low is a good sign; rising and high means the business is hungry for capital.
3. Estimate maintenance capex using the method above, then recompute free cash flow on that basis to see the owner’s true cash.
4. Check capitalisation policy in the accounting notes. Any shift toward capitalising more costs gets flagged.
5. Compare with return on invested capital. Low CapEx plus high returns is the hallmark of a great business; high CapEx plus low returns is a value trap waiting to happen.

Having sat on the company side in investor relations, I can tell you that CapEx guidance is one of the most scrutinised numbers in any results call, precisely because analysts know it drives free cash flow far more directly than reported profit does.

Frequently Asked Questions

What is the difference between CapEx and OpEx? CapEx is spending on long-lived assets such as buildings, machinery and equipment, which is recorded on the balance sheet and expensed over years through depreciation. OpEx is the cost of running the business day to day, such as wages, rent and materials, and is expensed in full in the period it occurs.

Why does the CapEx vs OpEx split matter to investors? Because it changes how and when costs hit the income statement. Capitalising a cost delays its impact on profit, flattering current earnings, while expensing it immediately reduces profit now. It also matters for free cash flow, which deducts CapEx but adds back depreciation.

Is depreciation CapEx or OpEx? Neither exactly. Depreciation is the accounting mechanism that gradually turns past CapEx into an expense on the income statement. It is a non-cash charge; the cash went out when the asset was bought, which is why free cash flow adds depreciation back and subtracts actual CapEx.

What is maintenance capex? Maintenance capex is the portion of capital spending needed just to keep existing assets and current output intact, as opposed to growth capex that expands capacity. Estimating it is key to knowing how much cash a business must reinvest simply to stand still.

Where do I find CapEx in the accounts? In the investing section of the cash flow statement, usually labelled purchases of property, plant and equipment, or additions to fixed assets. Depreciation appears on the income statement and is added back in the operating section of the cash flow statement.

Your Next Step

Take one company you follow and pull its CapEx and depreciation side by side for the last decade, then recompute free cash flow using your own estimate of maintenance capex. Read depreciation and amortisation explained to understand the non-cash charge that links them, and free cash flow to see why CapEx-light businesses are so prized. To judge whether the returns justify the capital, use our return on invested capital guide.

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About the author: Cameron Hayes is a senior investor relations and finance professional who has worked in IR at Nasdaq Copenhagen-listed companies including Nilfisk and Maersk Drilling. He holds an MSc from Copenhagen Business School and a BCom from the University of Ottawa, and founded Gingernomics to teach individual investors the Five Criteria framework. More about Gingernomics.

The content on Gingernomics is for educational and informational purposes only and does not constitute financial advice. Always do your own research and consult a licensed financial advisor before making any investment decisions. Past performance is not indicative of future results.