When valuing a business, the Cost of Equity is more than just a number, it’s the heartbeat of the valuation model. It defines what return investors expect for taking risks, and even a 1% change can alter a company’s valuation by millions.
Two popular models dominate this space, the Capital Asset Pricing Model (CAPM) and the Build-Up Method. Both aim to capture investor expectations, yet they differ in approach, practicality, and relevance, especially in the Indian context.
The CAPM is a market-based model built on the foundation of modern portfolio theory. It assumes that investors are rational and markets are efficient, meaning the risk and return relationship can be mathematically expressed as:
Cost of Equity = Risk-Free Rate + Beta × (Market Return − Risk-Free Rate)
Here, Beta (β) represents how volatile the company is compared to the market. If the market moves 10% and your company moves 15%, the Beta is 1.5, meaning it’s 50% riskier than the overall market. CAPM works beautifully for listed companies with reliable market data.
But what about private or unlisted companies, where Beta doesn’t exist or market data is limited? That’s where the Build-Up Method comes in. It starts with the Risk-Free Rate and adds layers of risk premiums, market risk, size premium, industry premium, and company-specific premium. Think of it as building a staircase of risk, step by step, until you reach the investor’s required return.
According to the International Valuation Standards (IVS) and ICAI Valuation Standards (VS 103), both CAPM and Build-Up methods are acceptable, but their suitability depends on data availability and the nature of the business.
For Indian unlisted companies, Build-Up often provides a more realistic picture because Betas derived from foreign markets or dissimilar comparables under CAPM can distort reality. ICAI emphasizes professional judgment and documentation, valuers must justify each premium added and disclose sources transparently.
CAPM remains ideal for mature, publicly traded entities with measurable market data. But for privately held SMEs, startups, or sectors with volatile earnings, the Build-Up Method is preferred due to its flexibility and adaptability.
Practical Observation: CAPM captures systematic risk, the one tied to market movements, while the Build-Up Method accounts for unsystematic risks like management quality, customer concentration, or governance. Combining insights from both models often gives a more rounded valuation outcome, especially in hybrid or diversified groups.
In India’s evolving financial landscape, both CAPM and Build-Up have their place. CAPM represents precision where markets are transparent; the Build-Up Method represents practicality where they are not.
For valuers, the art lies not in choosing one over the other, but in understanding when to use which, and how to blend both to arrive at a fair, defendable conclusion of value.
Which model do you rely on more in your valuations, CAPM or Build-Up? Share your perspective below!