What Are Owner Earnings and How Do You Calculate Them?

Buffett's owner earnings idea is the closest thing value investing has to a repeatable formula for real earning power, and it fits on an index card.

1. Start with reported net income, not operating cash flow. It is the accounting profit that already reflects the cost of running the business.
2. Add back non-cash charges, chiefly depreciation, depletion, amortisation and similar write-offs that reduced profit without moving cash.
3. Subtract maintenance capital expenditure, the spending required to keep existing plants, branches, rigs, kilns and equipment running at current volumes.
4. Adjust for working capital and one-off items, because cash tied up in receivables and inventory is cash an owner cannot take out.
5. Average the result over a full cycle, then compare it with the price being asked and insist on a margin of safety.

The owner earnings formula, written out plainly

Owner earnings = reported net income + depreciation, depletion and amortisation + other non-cash charges, minus maintenance capital expenditure, minus any additional working capital needed to maintain unit volumes and competitive position.

Buffett set the idea out in an appendix to his 1986 shareholder letter, and the word that does all the work is maintenance. Growth spending is voluntary, a choice an owner makes to expand. Maintenance spending is the toll a business pays to stay the same size. That single distinction is what separates owner earnings from almost every other profit measure.

Owner earnings vs free cash flow

Free cash flow is the number most investors reach for as a shortcut, and it is not the same thing.

The practical consequence is that free cash flow understates earning power for a business building new capacity, and overstates it for one quietly letting its assets age. Owner earnings tries to strip out both errors.

Estimating maintenance capex when the filing will not tell you

No annual report prints a maintenance capex line, so this becomes an exercise in judgement rather than arithmetic.

• Compare capex with depreciation across a full cycle. A business spending roughly its depreciation charge is broadly standing still. Much more than that suggests expansion, or a business that is losing ground.
• Read the segment notes. New plants, new routes and acquisitions are growth. Refurbishment, replacement and relining are maintenance.
• Watch unit volumes. If volumes are flat while capex is heavy, that spending is either maintenance or value-destroying, and neither flatters the business.
• Look at the industry. In a commodity industry nobody can skip sustaining capital for long, because competitors are all paying the same toll.
• Ask what a private owner would have to spend simply to keep the doors open at the same output next year. That reframing usually settles the argument.

How the four markets change the calculation

The formula is universal. Which term dominates is not, and that is where the four markets separate sharply.

United States (NYSE and NASDAQ)

The US tape is weighted towards technology, communication platforms, healthcare and financials, and many of its largest names are asset-light. Depreciation is modest and capital spending is a small slice of profit, so owner earnings often lands close to net income. The trap runs the other way: capitalised development costs, share-based pay and acquisitions can make reported profit look cleaner than the underlying cash reality.

United Kingdom (LSE)

London leans towards banks, insurers, oil and gas majors, miners and consumer staples. For a UK bank or insurer, the depreciation add-back is nearly irrelevant; the adjustment that matters is credit provisions and whether the balance sheet can keep supporting the loan book. For a miner or an oil major, sustaining capital is large and lumpy, so one year tells you very little and the cycle average carries most of the weight.

Canada (TSX)

Toronto is dominated by financials and energy, with materials close behind. Energy producers carry sustaining capital plus abandonment and reclamation obligations that sit outside the depreciation line entirely, and the banks again call for balance-sheet adjustments rather than depreciation arithmetic.

Nigeria (NGX)

Lagos leans on banks, cement, consumer goods and telecoms. For a cement producer, kiln maintenance and plant refurbishment is a real and recurring cash cost, while reported depreciation is distorted by inflation and naira movements, so the add-back needs a critical eye. Consumer and telecom businesses absorb working capital through distributor networks and infrastructure, and in a high-inflation setting a naira owner earnings figure only means something if it is built on a consistent basis across years.

Adjustments the accounting numbers tend to hide

• Depreciation is a convention, not a measurement. It spreads the historical cost of an asset over its life. Replacing that asset may cost more or less than the charge suggests.
• Working capital is real cash. Growth in receivables and inventory is money out of the door, and in inflationary markets it can be large.
• One-off items cut both ways. Asset sales and insurance recoveries flatter a year; restructuring charges depress it.
• Share-based pay is a cost, however it is presented, because owners bear the dilution.
• Amortisation of acquired intangibles is arguable, since it is either a stranded accounting entry or the real price of buying growth.

Where owner earnings sits in a valuation

Owner earnings is an input, never a verdict. It can be capitalised at a required return to give an owner earnings yield, or fed into a discounted cash flow alongside other checks, and it is most useful when compared against return on invested capital, the strength of the moat and the honesty of the balance sheet. A value desk tends to treat it as one of several gates a business must pass, because any single number can be adjusted until it says whatever the analyst already wanted to hear. That is why the number matters less than the reasoning behind the maintenance capex estimate.

Common mistakes

• Using total capex instead of maintenance capex, which understates the earning power of a growing company.
• Treating depreciation as the true maintenance cost, which overstates earning power when assets are ageing and replacement costs are rising.
• Ignoring working capital, especially for consumer and distribution businesses.
• Taking one year in a cyclical industry instead of a full-cycle average.
• Applying the formula unchanged to banks and insurers, where the real adjustments live on the balance sheet.
• Forgetting that owner earnings is a judgement, not a printout, and that a wide estimate should widen the margin of safety demanded.

The bottom line

Owner earnings asks the owner's question directly: after keeping the business as good as it is, how much cash is genuinely left? Reported earnings, EBITDA and even free cash flow each dodge part of that question. The formula is short. The judgement about maintenance capex is not, and that judgement is precisely where the value sits. This is analysis and education, not personalized financial advice.

AlphaTeak scores any stock across eight pillars, estimates fair value, and keeps an honest, public track record. Analysis and education, not advice.

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