Recently, I’ve been looking into company finances and found that many people confuse two concepts: cost of equity and cost of capital. Actually, they look similar, but their uses are completely different.

First, let’s talk about the cost of equity. Simply put, it’s the expected return shareholders want when investing in your company’s stock. Imagine I want to invest in your company; I need to consider the risks and also what I might earn from other investments. So, the company needs to calculate the minimum return it must offer me to be willing to invest. This cost of equity is usually calculated using the CAPM model, which is: risk-free rate plus (beta times market risk premium).

Beta is an interesting measure; it indicates how much your company’s stock fluctuates relative to the overall market. A beta greater than 1 means the stock is more volatile than the market, less than 1 means it’s more stable. The market risk premium is the extra return investors demand for bearing stock market risk compared to government bonds.

Several factors influence the cost of equity. The company’s financial performance, market volatility, interest rate levels, and overall economic conditions all play a role. If a company is riskier or has more volatile income, investors will require higher returns to compensate for that risk. During economic downturns or when interest rates rise, investors’ expectations also tend to increase.

Next, let’s discuss the cost of capital. This is a broader concept, encompassing all of a company’s financing costs, including both equity and debt financing. Essentially, it’s the weighted average cost of capital (WACC), used to evaluate whether new projects are worthwhile.

The cost of capital is usually calculated with WACC, which is: (market value of equity divided by total market value) times the cost of equity, plus (market value of debt divided by total market value) times the cost of debt times the tax adjustment factor. Here, you need to consider the market values of equity and debt, total enterprise value, debt interest rates, and the corporate tax rate. Since interest on debt is tax-deductible, the cost of debt is adjusted downward by the tax rate.

What factors influence the cost of capital? The company’s debt ratio, interest rates, and tax rates. Interestingly, if a company has a lot of debt but at low interest rates, its overall cost of capital might actually be lower. But the problem is, too much debt increases financial risk, which causes shareholders to demand higher returns, pushing the cost back up.

How do these two metrics compare? By definition, the cost of equity is the return shareholders require, while the cost of capital is the total financing cost. They are calculated differently and serve different purposes. Companies use the cost of equity to set minimum return thresholds, and the cost of capital to evaluate whether projects can cover their financing costs. Regarding risk factors, the cost of equity considers stock volatility and market conditions, while the cost of capital accounts for both debt and equity costs.

Generally, the cost of capital is lower than the cost of equity because it’s a weighted average, and debt is usually cheaper due to tax benefits. However, if a company has a very high debt load, its cost of capital might approach or even exceed the cost of equity.

Understanding these two concepts is very helpful for making investment decisions. Stock volatility and economic conditions directly impact your expected returns. So, clarifying the difference between the cost of equity and the cost of capital is key for evaluating investment opportunities and optimizing financial strategies.