A company that pays no dividend and earns well on its capital can pour every rupee of profit back into growing. One that pays most of its profit out, or earns little on what it keeps, cannot grow itself nearly as fast on its own money. The sustainable growth rate turns that intuition into a number.
- Return on equity
- Profit earned on shareholders’ equity — how productively the retained money works
- Retention ratio
- The fraction of earnings kept in the business — one minus the dividend payout ratio
Example: A firm with a 20% return on equity that pays out a quarter of its profit retains three-quarters, giving a sustainable growth rate of 20% × 0.75 = 15%. It can grow at about 15% a year without raising outside capital or adding leverage.
The gap between this and actual growth is the story
The number is most useful as a benchmark. When a company grows faster than its sustainable rate year after year, it cannot be doing it on retained profit alone — so it is issuing shares, borrowing more, or lifting its return on equity, and each of those has consequences worth understanding before you assume the growth is free. When it grows more slowly than its sustainable rate, it is throwing off more capital than it reinvests, which either means generous dividends and buybacks ahead or a shortage of good projects. Either way, the comparison points you at the right next question.
A company’s sustainable growth rate is 12%, but its sales are growing at 20% a year. What does that gap tell you?
Company kitni tez badh sakti hai sirf retained profit se — bina nayi equity, bina extra leverage? Yeh sustainable growth rate = ROE × retention ratio (jo hissa payout nahi hota). 20% ROE, 75% retain → SGR = 15%. Actual growth se milao: agar company iss se tez badh rahi, toh gap kahin se aa raha — equity issue, zyada debt, ya badhta ROE — dilution/leverage dhoondo, poocho kitna tikega. Iss se dheere badhe = reinvest se zyada capital bana rahi (zyada dividend/buyback aage, ya achhe projects khatam). Catch: yeh fixed assumptions ka ceiling hai, forecast nahi; leverage se ROE flatter hota toh SGR bhi; aur tez growth tabhi keemti jab retained paisa profitably reinvest ho — low-return project mein daalna value todta hai.
- The sustainable growth rate is the fastest a firm can grow on retained profit alone, with no new equity or leverage.
- It equals return on equity times the retention ratio (one minus the payout ratio).
- Growth above it must be funded by dilution, more debt, or a rising ROE — so go find which.
- Growth below it means the firm generates more capital than it reinvests.
- It is a ceiling under fixed assumptions, flattered by leverage, and only valuable with profitable reinvestment.
Mark it done to track your progress through the curriculum.
Common questions
Short, direct answers to what people ask about this topic.
- what is the sustainable growth rate
- The sustainable growth rate is the fastest a company can grow its sales and earnings using only the profits it retains — without raising new equity or increasing its leverage. It is calculated as return on equity multiplied by the retention ratio, the share of earnings kept rather than paid out as dividends. If a firm earns 20% on equity and retains three-quarters of its profit, its sustainable growth rate is 15%. Grow faster than that for long, and the money has to come from somewhere else.
- what is the sustainable growth rate formula
- Sustainable growth rate = return on equity × retention ratio, where the retention ratio is one minus the dividend payout ratio. The logic is that retained profit adds to equity, and if the company keeps earning the same return on that larger equity base while holding its leverage steady, equity — and the sales it can support — compounds at exactly ROE times the fraction retained. So the two levers are how profitable the firm is on its equity and how much of that profit it keeps in the business.
- how do you use the sustainable growth rate
- Compare it to how fast the company is actually growing. If real growth is running above the sustainable rate, the firm must be funding the gap by raising equity, taking on more debt, or squeezing more return out of its equity — so you go looking for dilution, rising leverage or a margin story, and ask whether it can last. If real growth is below the sustainable rate, the company is generating more internal capital than it is reinvesting, which raises the question of whether it should pay out more or has run short of good opportunities.
- what are the limitations of the sustainable growth rate
- It is a ceiling under fixed assumptions, not a forecast: it assumes ROE, margins, payout and leverage all stay constant, which they rarely do. A high sustainable growth rate is only worth having if the company actually has profitable places to reinvest the retained money — retaining earnings to fund low-return projects destroys value however fast it lets the firm grow. And because it is built on ROE, it inherits ROE’s flattery from high leverage, so a big sustainable growth rate propped up by debt is not the same as one earned by genuine profitability.