Two businesses each report $500,000 of profit this year. One lets you take home nearly all of it. The other quietly demands $300,000 back for new equipment, software, and vehicles just to stay where it is — leaving you $200,000 poorer than the income statement suggested. Reported earnings cannot tell you which business you own. Owner earnings can.
Owner earnings is Warren Buffett's answer to a deceptively simple question: after the business pays everything it must pay to stay competitive, how much cash is actually left for you, the owner? Buffett introduced the concept in his 1986 letter to Berkshire Hathaway shareholders, calling it "the relevant item for valuation purposes — both for investors in buying stocks and for managers in buying entire businesses." Four decades later, it remains the clearest lens for judging what a business truly produces.
This guide walks through Buffett's definition, each piece of the formula, how owner earnings differs from free cash flow, how to estimate the one input nobody reports, and the mistakes that most often inflate the number.
Buffett's 1986 Definition
In the 1986 Berkshire Hathaway shareholder letter, Buffett defined owner earnings this way:
"[Owner earnings] represent (a) reported earnings plus (b) depreciation, depletion, amortization, and certain other non-cash charges … less (c) the average annual amount of capitalized expenditures for plant and equipment, etc. that the business requires to fully maintain its long-term competitive position and its unit volume."
In shorthand, the formula most investors use today is:
Owner Earnings = Reported Earnings + Non-Cash Charges − Average Annual Maintenance CapEx ± Change in Working Capital
The working-capital adjustment is a later refinement rather than part of Buffett's original sentence: a growing business ties up cash in receivables and inventory, and that cash is no more available to the owner than money spent on a new machine. Many practitioners fold it in; purists apply it separately. Either way, the logic is identical — count only cash the owner could actually withdraw without shrinking the business.
To show why the measure matters, Buffett's letter sketched two fictional companies, each earning $2 million. One needed almost no capital spending to hold its position; the other had to pour money back into plant and equipment every year just to stand still. Same reported earnings, radically different owner earnings — and radically different values. Any time two businesses post the same profit, that parable is worth recalling.
The Formula, Piece by Piece
(a) Start With Reported Earnings
Reported earnings means GAAP net income — the bottom line of the income statement. It is the starting point, not the answer, because accrual accounting answers a different question than the owner asks. Net income matches revenues and expenses to periods; the owner wants to know what cash can leave the building.
One caution before you go further: strip out earnings that do not reflect the ongoing business. A one-time gain on selling a warehouse, a restructuring charge that will not repeat, or a big unrealized investment swing can all distort the starting point. Owner earnings is a measure of the durable, repeatable business, so normalize first.
(b) Add Back Non-Cash Charges
Depreciation, depletion, amortization, stock-based compensation, asset impairments, and deferred taxes all reduce reported earnings without consuming cash in the current period. Adding them back converts the accrual starting point toward cash reality.
Depreciation deserves a special note because it plays two roles in this analysis. Here it is added back because no cash left the business when the depreciation entry posted. But the economic reality behind depreciation — assets wearing out and eventually needing replacement — reappears in part (c) as maintenance capital expenditure. The two roughly offset for a stable business, which is why some investors casually treat them as cancelling out. As you will see below, that shortcut is exactly where inflation quietly breaks the math.
(c) Subtract Maintenance CapEx — The Heart of the Measure
This is the entire point of owner earnings and the only input no financial statement hands you directly. Maintenance capital expenditure is the average annual amount the business must spend on plant, equipment, technology, and other long-lived assets to fully maintain its long-term competitive position and its unit volume.
Three words in that definition do heavy lifting:
- Average annual. CapEx arrives in lumps — a roof one year, a fleet refresh the next. A single year's spending can wildly over- or understate the true run rate, so Buffett specified an average. Three to five years of history is the usual window.
- Maintain. Only spending that defends the current position counts here. A new production line that doubles capacity is growth CapEx — an investment you chose, not a toll you paid. Owner earnings deducts the toll, not the investment.
- Competitive position and unit volume. "Maintain" does not mean keeping the lights on in a decaying business. If rivals are automating and you must automate to keep your customers, that automation is maintenance spending no matter what the budget label says.
Why does this matter so much? Because maintenance CapEx is frequently larger than depreciation. Depreciation spreads the historical cost of old assets; replacement happens at today's prices. In an inflationary environment, the machine that cost $100,000 a decade ago costs $140,000 to replace — and depreciation based on $100,000 understates the cash you will actually surrender. Buffett's original letter made exactly this point: for many businesses, the (c) charge runs well above the (b) add-back, and reported earnings overstate the cash the owner will ever see.
Adjust for Working Capital
A business that grows its sales usually grows its receivables and inventory first and collects the cash later. That buildup is a real use of cash: if receivables rise $80,000 this year, $80,000 of your "profit" is sitting in customers' hands, not yours. Conversely, stretching payables frees cash temporarily.
The adjustment is straightforward: subtract increases in operating working capital (receivables plus inventory minus payables), and add back decreases. Exclude cash itself and interest-bearing debt from the calculation — you are measuring the operating cycle's appetite for cash, not the financing choices around it. For a stable small business the number is often small, but for a fast-growing one it can dwarf everything else in the formula.
Owner Earnings vs. Free Cash Flow
Free cash flow — operating cash flow minus total capital expenditures — is the closest mainstream cousin, and many investors treat the two as interchangeable. Sometimes they nearly are. When they diverge, the difference comes down to two choices:
Growth CapEx. Free cash flow subtracts every dollar of capital spending, including expansion a business chose to make. That penalizes growing companies: a retailer opening ten profitable new stores looks cash-poor in exactly the year it is creating the most value. Owner earnings subtracts only maintenance CapEx, so growth spending shows up for what it is — an investment to be judged on its returns, not a cost of staying alive.
Working capital noise. Standard free cash flow absorbs the full swing of each year's working-capital change, which can bounce with timing — a big customer paying on January 2 instead of December 30 moves tens of thousands between years. Owner-earnings practitioners tend to average or normalize this item rather than letting one year's swing drive a valuation.
Which to use? For a mature, slow-growing business, free cash flow and owner earnings usually land in the same neighborhood, and free cash flow wins on convenience. For a growing business, a capital-intensive business, or any business you might actually buy, owner earnings is the more honest number — it separates the cost of standing still from the cost of moving forward.
How to Estimate Maintenance CapEx
Here is the uncomfortable truth: companies do not report maintenance CapEx as a line item. You have to estimate it. Four approaches, from roughest to best:
1. Use depreciation as a first proxy. For a mature business with stable asset prices, annual depreciation approximates the run-rate cost of replacing worn-out assets. It is a starting point only — it misses inflation on replacement costs, assets that were fully depreciated years ago but still need replacing, and any systematic under- or over-investment.
2. Read management's own words. Annual reports and earnings calls often disclose "maintenance" versus "growth" or "expansion" capital spending, sometimes buried in the liquidity discussion or segment notes. When management volunteers the split, take it — with the usual skepticism about self-serving labels.
3. Average total CapEx over a full cycle. For businesses that rarely expand, a five-year average of total CapEx is often a decent maintenance estimate, since nearly all spending is replacement. The longer the average, the less a single lumpy year distorts it.
4. Build it bottom-up from the asset base. List the major asset categories, their replacement costs at today's prices, and their remaining lives, then annualize. A delivery fleet worth $600,000 replaced every six years implies roughly $100,000 a year of maintenance CapEx whether or not this year's checkbook shows it. This is the most work and the most accurate answer — and for an owner-operator buying or running a small business, it is the only method that captures what the next decade will actually demand.
Whichever method you use, sanity-check the result against reality: if your estimate implies the business can hold its position while spending far less than its competitors spend per unit of output, you have probably labeled maintenance spending as growth.
A Worked Example
Imagine you run a small commercial printing shop. This year's books show:
- Net income: $200,000
- Depreciation and amortization: $45,000
- Stock-based compensation and other non-cash charges: $5,000
- Total CapEx: $120,000 — of which $70,000 replaced aging presses (maintenance) and $50,000 added a new large-format line (growth)
- Increase in receivables and inventory, net of payables: $15,000
Owner earnings runs as follows:
$200,000 + $45,000 + $5,000 − $70,000 − $15,000 = $165,000
That $165,000 — not the $200,000 of net income — is what the business produced for you this year while holding its competitive position. Note what the formula respected and what it ignored: the $50,000 growth investment is excluded because it bought future capacity, and the $15,000 tied up in working capital is excluded because it is not in your pocket yet. If you value the shop at, say, eight times owner earnings, you get $1.32 million — a price anchored to cash you can actually withdraw, year after year, without the business slipping backward.
Five Mistakes That Inflate Owner Earnings
Treating all CapEx as growth. The most common error, and the most flattering: labeling the new roof, the replacement truck, and the software migration as "investments" so none of them reduce the number. If spending was required to keep current customers at current volumes, it is maintenance — whatever the invoice called it.
Using depreciation as the CapEx figure for a growing or inflating business. Depreciation reflects what assets cost years ago. When replacement costs have risen, or when the asset base is expanding, depreciation understates the cash the business must surrender. Buffett's original warning on this point has only aged well.
Ignoring working capital. Service businesses can often skip this adjustment, but any business carrying receivables or inventory cannot. A wholesaler growing 30% a year can easily consume more cash in working capital than it reports in profit — and owner earnings must show that.
Measuring a single year. One year's CapEx might be zero because the big replacement lands next year; one year's working capital might look wonderful because a customer prepaid in December. Average the lumpy inputs over several years or the number describes luck, not the business.
Starting from unadjusted earnings. A gain on an asset sale, a pandemic-era grant, or a one-time legal settlement flows through net income but tells you nothing about next year's cash. Normalize the starting point or the whole edifice leans.
Tracking It in Your Own Books
Owner earnings is easiest to compute when your chart of accounts already separates the two kinds of capital spending. Most small-business books dump everything into one equipment or fixed-asset account, which makes the maintenance-versus-growth split a year-end archaeology project. A cleaner structure distinguishes them at the moment money is spent:
2026-03-14 * "Replace bindery cutter motor" "ABC Machinery"
Assets:Fixed:Equipment:Maintenance 4,800.00 USD
Assets:Checking:Business -4,800.00 USD
2026-06-02 * "New large-format press — capacity expansion" "PressWorks"
Assets:Fixed:Equipment:Growth 50,000.00 USD
Assets:Checking:Business -50,000.00 USDWith that split in place, your maintenance CapEx for any period is a single account balance instead of a forensic exercise, and the owner-earnings computation becomes a five-minute job at year end. If you are setting up your books this way for the first time, the documentation walks through account structure and opening balances step by step.
Your Next Step
Pull your last three years of financials and run the formula once, roughly: net income, plus depreciation and other non-cash charges, minus your best estimate of average maintenance CapEx, minus working-capital growth. If the result lands well below reported earnings year after year, you have found the gap between the profit your accountant reports and the cash your business actually yields — and every pricing, hiring, and expansion decision you make from here should be sized to the smaller number.
