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Direct answer
DuPont analysis decomposes accounting return on common equity into linked ratios so an analyst can see whether ROE comes from profit margin, asset use, financial leverage, taxes, or financing costs. The standard three-step identity is:
ROE = net margin x asset turnover x equity multiplier
Using matched definitions:
net margin = net income attributable to common / revenue
asset turnover = revenue / average assets
equity multiplier = average assets / average common equity
The intermediate terms cancel, leaving:
ROE = net income attributable to common / average common equity
The decomposition explains the arithmetic sources of reported ROE. It does not by itself establish competitive advantage, cash generation, sustainable growth, cost of equity, valuation, or shareholder return.
How the three-step and five-step bridges work
Net margin captures earnings left for common shareholders per unit of revenue, after operating costs, interest, taxes, and other included items. Asset turnover relates a period’s revenue to the assets used to generate it. The equity multiplier relates those assets to the common-equity base and is an accounting leverage indicator, not a complete debt-risk measure.
Because revenue and income are period flows while assets and equity are point-in-time balances, use averages that represent the period. A simple convention is:
average balance = (opening balance + closing balance) / 2
Quarterly or monthly averages can be more representative when acquisitions, divestitures, buybacks, impairments, seasonality, or rapid growth make endpoints unrepresentative. Use attributable net income and the matching equity claim: subtract preferred dividends or other non-common claims when calculating return on common equity, and do not mix total equity in one ratio with common equity in another.
The five-step DuPont identity separates financing and tax effects:
ROE = tax burden x interest burden x EBIT margin x asset turnover x equity multiplier
One common definition set is:
tax burden = net income attributable to common / earnings before tax
interest burden = earnings before tax / EBIT
EBIT margin = EBIT / revenue
The product again cancels to net income attributable to common divided by average common equity, provided every numerator and denominator uses the same scope and period. Negative or near-zero EBIT, pretax income, revenue, or equity can create signs and extreme values that are arithmetically correct but economically unhelpful.
Compare drivers through time and with genuinely comparable businesses. Banks and insurers use assets and leverage differently from industrial companies; software, retail, utilities, and acquisitive companies also have structurally different margins, turnover, goodwill, leases, working capital, and capital needs. Industry-specific returns and capital measures may be more informative.
Worked three-step and five-step example
Assume a company reports US$1,000m of revenue, US$150m of EBIT, US$120m of earnings before tax, and US$90m of net income attributable to common. Assets rise from US$700m to US$800m, while common equity rises from US$280m to US$320m.
Average balances are:
average assets = (US$700m + US$800m) / 2 = US$750m
average common equity = (US$280m + US$320m) / 2 = US$300m
Direct ROE is:
ROE = US$90m / US$300m = 30.0000%
The three-step components are:
net margin = US$90m / US$1,000m = 9.0000%
asset turnover = US$1,000m / US$750m = 1.3333x
equity multiplier = US$750m / US$300m = 2.5000x
Using unrounded inputs:
9.0000% x 1.3333x x 2.5000x approximately 30.0000%
The five-step components are:
tax burden = US$90m / US$120m = 0.7500x
interest burden = US$120m / US$150m = 0.8000x
EBIT margin = US$150m / US$1,000m = 15.0000%
Combining those with exact asset turnover and the equity multiplier gives:
0.7500x x 0.8000x x 15.0000% x 1.3333x x 2.5000x approximately 30.0000%
Now compare a second company with 5.0000% net margin, 1.5000x asset turnover, and a 4.0000x equity multiplier:
5.0000% x 1.5000x x 4.0000x = 30.0000% ROE
Both companies report the same ROE, but the second combines thinner margins with more balance-sheet leverage. That observation is a diagnostic, not proof that it is worse: debt terms, cash-flow stability, asset risk, liquidity, regulation, and business model determine whether leverage is sustainable.
Review checklist and analytical risks
- Define whether the target is ROE, return on common equity, or return on tangible common equity.
- Match net income attributable to common with average common equity in the denominator.
- Reconcile continuing operations, discontinued operations, noncontrolling interests, and preferred dividends.
- Use the same revenue, EBIT, pretax-income, asset, and equity scope throughout the identity.
- Average balance-sheet accounts over the earnings period rather than defaulting to an arbitrary endpoint.
- Use more frequent averages when acquisitions, divestitures, buybacks, impairments, or seasonality are material.
- Recalculate every component from filings instead of mixing data-vendor conventions.
- Separate reported GAAP or IFRS figures from adjusted measures and preserve a reconciliation.
- Identify unusual gains, charges, tax benefits, restructuring, litigation, and fair-value movements.
- Examine whether margins improved through pricing, mix, volume, cost control, capitalization, or one-time items.
- Break asset turnover into receivable, inventory, fixed-asset, and working-capital drivers where useful.
- Review goodwill, acquired intangibles, leases, securitization, and off-balance-sheet commitments.
- Interpret the equity multiplier with debt maturities, rates, covenants, liquidity, and interest coverage.
- Test whether repurchases raised ROE mainly by shrinking book equity rather than improving earnings.
- Treat negative or very small equity as a warning that ROE and its decomposition may be unusable.
- Compare businesses with similar accounting, fiscal periods, geography, industry, and capital intensity.
- Use bank, insurer, real-estate, and other industry-specific capital and return measures where appropriate.
- Compare earnings with operating cash flow, free cash flow, capital expenditure, and working-capital needs.
- Connect ROE to retention, dilution, dividends, and reinvestment returns before inferring growth.
- Combine DuPont analysis with valuation, cost of capital, competitive position, and scenario analysis.
Common misconceptions
- “A higher ROE always means a better business.” Leverage, buybacks, losses that depleted equity, or one-time gains can raise or distort ROE without improving operations.
- “The equity multiplier measures debt precisely.” It is assets divided by book equity and is affected by all liabilities, accounting values, treasury stock, and accumulated results.
- “Low asset turnover is necessarily inefficient.” Capital intensity, long-lived assets, regulation, and business model determine a meaningful benchmark.
- “The factors independently cause ROE.” DuPont is an accounting identity; factors interact, and changing financing can alter net margin as well as the equity multiplier.
- “DuPont analysis values the shares or predicts cash returns.” It decomposes historical or forecast accounting returns and must be paired with cash flow, risk, growth, and valuation analysis.