In Berkshire Hathaway's 1986 annual letter to shareholders, Warren Buffett introduced a concept he called "owner earnings" — a cash flow measure he considered far more meaningful than either reported net income or conventional free cash flow for assessing the true economic value of a business. Decades later, owner earnings remains one of the most intellectually rigorous cash flow definitions in fundamental analysis, and understanding it helps investors cut through the noise of accounting-driven earnings to find the number that actually matters for valuation.
The Owner Earnings Formula
Buffett defined owner earnings as follows (paraphrased from the 1986 letter):
Owner Earnings = Net Income + Depreciation & Amortization + Other Non-Cash Charges − Average Annual Maintenance Capital Expenditures − Any Additional Working Capital Required
More practically, most analysts compute it as:
Owner Earnings ≈ Net Income + D&A − Maintenance Capex
The key variables:
Net income is the starting point — reported earnings after interest, taxes, and all expenses. This figure includes non-cash charges (depreciation, amortization) that are added back.
Depreciation and amortization (D&A) are non-cash expenses that reduce reported net income without a corresponding cash outflow in the current period. Adding them back recovers cash that was "charged" against earnings for assets that were paid for in prior years.
Maintenance capital expenditures are the reinvestment required to maintain the company's current competitive position and productive capacity. This is the critical and difficult component. Maintenance capex is not a line item in financial statements — it requires judgment to estimate. Total capex from the cash flow statement includes both maintenance spending (to sustain existing operations) and growth capex (to expand capacity). Buffett's owner earnings framework focuses exclusively on maintenance capex, since that is the true economic cost of sustaining the business.
Why Owner Earnings Differs from Free Cash Flow
Standard free cash flow is typically calculated as:
Free Cash Flow = Operating Cash Flow − Total Capital Expenditures
The difference from owner earnings lies in two areas:
1. Working capital changes: Operating cash flow reflects the cash impact of working capital movements in the current period — changes in receivables, inventory, and payables. Owner earnings adds back working capital fluctuations that are considered temporary or cyclical rather than permanent economic costs. For companies with stable operations, this distinction is minor; for highly cyclical businesses or those in rapid growth, it can be significant.
2. Maintenance vs. total capex: Standard free cash flow subtracts total capex, which includes both maintenance and growth spending. A company investing heavily to expand into new markets or build new manufacturing capacity will show low or negative free cash flow, but its owner earnings — using only maintenance capex — may be strongly positive. Buffett's framework credits the company for its investment optionality while recognizing that growth capex is discretionary, not a fixed cost of maintaining existing operations.
In practical terms, a company with $200M in operating cash flow and $80M in total capex (of which $30M is maintenance and $50M is growth) would show:
- Free cash flow: $200M − $80M = $120M
- Owner earnings: Net income + D&A − $30M maintenance capex ≈ roughly $170M (depending on working capital adjustments)
The owner earnings figure is higher, reflecting that $50M of the capex is discretionary growth spending that is generating future value, not a cost of sustaining today's business.
The Challenge of Estimating Maintenance Capex
The most difficult aspect of owner earnings is estimating maintenance capex, since companies do not disclose it separately. Several approaches are commonly used:
Management disclosure: Some companies (particularly capital-intensive businesses) disclose maintenance capex in their annual reports or investor presentations. This is the most reliable source.
Historical capex as a percentage of D&A: Over a long operating history, maintenance capex approximates depreciation for companies not undergoing dramatic changes in asset base. If D&A is $100M and the company is in a mature industry, maintenance capex is often in the $80-120M range.
Industry benchmarks: Capital intensity varies widely by sector. A software company may have maintenance capex of just 2-3% of revenue; a pipeline company may require 8-12%. Industry-level averages provide a useful sanity check.
Management's own statements on sustaining capacity: In some cases, management will indicate in calls or filings what proportion of capex is "maintenance versus growth," providing a direct estimate.
Real-World Example: Coca-Cola (KO)
Coca-Cola (KO) illustrates why owner earnings became Buffett's preferred measure for the types of businesses he favors most. Coca-Cola's primary business — the concentrate business — requires relatively modest maintenance capital expenditure to sustain. The company's physical infrastructure (plants, equipment) depreciates steadily, but the real value lies in intangible assets: brand, distribution relationships, and consumer loyalty. These do not depreciate on a GAAP basis but also do not require heavy maintenance capex.
In a representative fiscal year, Coca-Cola might report net income of $9B, D&A of $1.5B, and total capex of $2B. If maintenance capex is estimated at $1B (the remainder being growth spending on new markets and production capacity), owner earnings might be approximately:
$9B + $1.5B − $1B = $9.5B
Compare this to free cash flow of $9B + $1.5B operating cash flow changes − $2B total capex ≈ $8.5B (simplified).
The difference highlights that Coca-Cola's growth capex creates future value; its owner earnings capture the cash generated from its current business. This is exactly the kind of high-owner-earnings, low-maintenance-capex business that Buffett has described as his ideal acquisition target.
Why Owner Earnings Matters for Intrinsic Value
When valuing a business using discounted cash flow (DCF) methodology, the choice of cash flow measure materially affects the resulting intrinsic value estimate. Discounting free cash flow for a company undergoing heavy growth investment will produce a lower intrinsic value than discounting owner earnings, even if the two definitions of value converge over the long run.
Buffett's argument is that for a stable, mature business with predictable reinvestment requirements, owner earnings represent the most accurate measure of the cash available to the business owner each year — money that could theoretically be extracted from the business without impairing its long-term competitive position.
For growth companies, owner earnings and free cash flow may diverge significantly, and the distinction matters for valuation. A company reinvesting heavily in genuinely high-return growth projects is creating more value per dollar of capex than its free cash flow statement suggests. Owner earnings makes this visible.
Using the Owner Earnings Calculator at ValueMarkers
The Owner Earnings Calculator at ValueMarkers takes any ticker and computes owner earnings using both a D&A-based maintenance capex estimate and a percentage-of-revenue estimate, displaying the range and allowing investors to input their own maintenance capex assumptions. The tool also shows the historical owner earnings trend over 5 years, making it easy to assess consistency and growth.
The DCF Calculator at ValueMarkers can be used alongside owner earnings estimates to produce intrinsic value ranges — inputting owner earnings as the cash flow basis rather than reported free cash flow for a more conservative and arguably more economically accurate valuation.
Key Takeaways
Owner earnings is Warren Buffett's preferred measure of a business's true cash generation capacity: net income plus non-cash charges minus only the maintenance capital expenditures required to sustain competitive position. It differs from standard free cash flow by separating discretionary growth investment from the recurring cost of maintaining existing operations. The concept is most powerful for mature, capital-efficient businesses where the distinction between maintenance and growth capex is meaningful. Estimating maintenance capex requires judgment, making owner earnings more analytically demanding than simple free cash flow — but that extra analytical effort is precisely what reveals the businesses whose economics are most compelling for long-term ownership.