Warren Buffett introduced the concept of owner earnings in his 1986 letter to Berkshire Hathaway shareholders. He argued that standard accounting earnings — the EPS number most investors focus on — can be misleading. Owner earnings, he said, are what actually matters to a business owner.
The Problem with EPS
Earnings per share is the most widely quoted profitability metric, but it has serious flaws:
- Depreciation may not reflect actual capital needs — D&A is an accounting estimate of asset wear, but it can significantly overstate or understate the real cash a company must spend to maintain its productive capacity.
- It ignores maintenance capital expenditures — the money a company must spend just to keep its existing operations running. The gap between D&A and actual maintenance capex can distort the true earnings picture.
- It can be manipulated through accounting choices around revenue recognition, one-time charges, and restructuring costs.
A company can report growing EPS while actually generating less and less cash for its owners.
Buffett's Formula
In his 1986 letter, Buffett defined owner earnings as:
Owner Earnings = Net Income + Depreciation & Amortization − Maintenance Capital Expenditures
The logic is straightforward:
- Start with net income — what the company reports as profit
- Add back depreciation and amortization — these are accounting charges, not real cash outflows
- Subtract maintenance capex — the capital spending required to maintain current productive capacity
The result is the cash that a business owner could theoretically extract from the business each year without degrading its competitive position.
Owner Earnings vs. Free Cash Flow
Free cash flow (FCF) is calculated as:
FCF = Operating Cash Flow − Total Capital Expenditures
The key difference is that FCF subtracts all capex — both maintenance and growth. Owner earnings only subtract maintenance capex, which means they capture the full earning power of the business, including the cash that's being reinvested for growth.
This distinction matters most for companies that are investing heavily in expansion. A fast-growing business might show modest free cash flow because it's plowing money into new stores, factories, or data centers. But its owner earnings could be much higher, reflecting the true profitability of its existing operations.
Why It Matters for Valuation
When you run a DCF analysis, the input that matters most is the cash flow you're discounting. Using owner earnings instead of standard free cash flow can give you a more accurate picture of intrinsic value, especially for:
- Capital-intensive businesses (manufacturers, utilities, telecoms) where the gap between maintenance and total capex is large
- High-growth companies that are reinvesting aggressively
- Companies with significant depreciation that overstates the actual economic cost of their assets
On SafetyMargin.io, the DCF Analysis component lets you toggle between FCF-based and Owner Earnings-based valuation. Try running both on a company like AAPL or MSFT to see how the intrinsic value estimate changes.
The Hard Part: Estimating Maintenance Capex
The biggest challenge with owner earnings is that companies don't separately disclose maintenance vs. growth capex. You have to estimate it. Common approaches include:
- Use depreciation as a proxy — If a company's assets are being replaced at roughly the same rate they're wearing out, depreciation approximates maintenance capex. This works well for mature, stable businesses.
- Compare capex to depreciation over time — If capex consistently exceeds depreciation, the excess is likely growth capex.
- Look at capex as a percentage of revenue — For a stable business, this ratio should be relatively constant. Spikes suggest growth investment.
SafetyMargin.io estimates maintenance capex using the depreciation proxy, which is the most widely accepted approach and the one closest to Buffett's original formulation.
When to Use Owner Earnings
Owner earnings are most valuable when you're trying to assess the true earning power of a business — what it could pay out to owners if it stopped growing. This makes it ideal for:
- Valuing mature, stable businesses (Buffett's preferred targets)
- Comparing profitability across companies with different capital intensity
- Spotting companies where reported earnings understate or overstate real profitability
Check the Historical Charts on any stock page on SafetyMargin.io — the Owner Earnings tab shows the trend over time alongside SBC-adjusted free cash flow, giving you multiple lenses on earnings quality.
The Bottom Line
EPS tells you what the accountants say a company earned. Owner earnings tell you what the owner actually earned. For value investors, that distinction is everything. As Buffett wrote in his 1986 letter: the relevant question for owners is how much cash a business can be expected to generate for them over its remaining life — and owner earnings are the best approximation of that figure.