Sustainable Growth Rate
The Sustainable Growth Rate (SGR) is the maximum rate at which a company can grow its revenues and earnings without altering its financial leverage or issuing new equity, funded purely by retained earnings.
The Sustainable Growth Rate answered a fundamental capital allocation question: given a company's current profitability, dividend policy, and financial structure, how fast could it grow without needing external equity financing or increasing its debt ratio? Growing faster than the SGR inevitably required either more debt, dilutive equity issuances, or a decline in dividends — all of which had implications for shareholder value.
The formula derived by Robert Higgins was: SGR = ROE × (1 − Dividend Payout Ratio). Equivalently, SGR = (Return on Equity × Retention Ratio). A company with ROE of 20 percent and a dividend payout of 30 percent had a retention ratio of 70 percent and an SGR of 14 percent. This meant it could grow at 14 percent annually using only retained earnings, without needing any external capital at constant leverage.
In India, comparing a company's actual revenue growth rate to its SGR was a diagnostic tool. Companies consistently growing faster than their SGR were implicitly consuming more capital — through rising debt or dilutive equity — than their operations generated. This was not inherently problematic for high-growth businesses intentionally investing ahead of maturity, but it was a warning signal for mature companies where aggressive revenue growth was accompanied by balance sheet deterioration. The infrastructure sector's collapse between 2012 and 2018 involved many conglomerates that had grown revenues far beyond their SGR through debt accumulation.
Conversely, companies with high SGR that grew slowly were accumulating excess cash or returning capital through buybacks and dividends. India's IT majors — TCS, Infosys — had SGR values significantly above their actual revenue growth rates for years, which explained their large cash piles and growing dividend payouts and buybacks. The excess internal generation beyond growth needs eventually needed to be distributed or deployed, and management decisions about this surplus shaped capital allocation quality.
SGR also changed when underlying profitability or dividend policy changed. A company that improved its ROE — through margin expansion, asset turnover improvement, or leverage — raised its SGR proportionally, meaning it could sustainably support faster growth without financial strain. This linkage connected operating performance back to balance sheet sustainability in a direct and quantifiable way.