The cost of capital is the most important number for every business decision, from buying new equipment to opening a new branch. For Indian businesses, including NBFCs and SMEs, it shows whether their growth plans are financially sound.
In this article, you'll learn what the cost of capital means, its components, how to use the cost of capital formula to figure it out, and why it's important for making investment choices.
How to Calculate the Cost of Capital
The definition of cost of capital is the minimum return a company needs to earn on its investments in order to keep its market value and raise funds. It's what the company pays for using capital, whether it's through debt, equity, or profits that it keeps.
This cost is used as a standard or discount rate when looking at projects. If a project's expected return is less than the cost of capital, it could hurt shareholder value.
Different Components of the Cost of Capital
The cost of capital includes different ways to get money, and each one has its own cost. In practice, there are six key components:
- Cost of Equity
- Cost of Debt
- Cost of Preferred Capital
- Cost of Retained Earnings
- Marginal Cost of Capital
- Overall / Weighted Average Cost of Capital (WACC)
1. Cost of Equity
The cost of equity is the return that shareholders expect to get. The Capital Asset Pricing Model (CAPM) is a common way to figure it out:
The cost of equity (Ke) is equal to Rf plus β(Rm - Rf).
Rf = the risk-free rate, like the yield on a government bond
β = Beta coefficient (the risk of the company's stock)
Market risk premium = (Rm - Rf)
Many NBFCs in India use long-term government bonds as a standard to judge this.
2. Cost of Debt
The cost of debt is the actual interest rate that a business pays on money it borrows. Interest is tax-deductible, so it is usually adjusted for tax while estimating Kd.
{After-tax Cost of Debt (Kd)} = i(1 - T)
Where i is the pre-tax rate and T is the interest rate.
3. Cost of Preferred Capital (Preference Shares)
The cost of preferred capital is the return that investors in preference shares expect to receive in the form of a fixed dividend. It is usually calculated as:
Kp=Dp/ Po
Where Dp is the annual preferred dividend and Po is the current market price (or issue price) of the preferred share.
Because preference dividends are typically fixed, the cost of preferred capital behaves like the cost of a perpetual bond, and is usually lower than the cost of common equity but higher than the after-tax cost of debt.
4. Cost of Retained Earnings
Retained earnings are profits that the company keeps in the business instead of paying out as dividends. Even though the firm does not “pay” explicit interest or dividends to raise this capital, there is an opportunity cost: shareholders could have invested that money elsewhere.
So, the cost of retained earnings is usually taken to be roughly equal to the shareholders’ required return (often proxied by the cost of equity), adjusted for flotation cost savings if any. In simple terms, retained earnings are not “free money”; they carry the same expected return requirement that equity investors have.
5. Marginal Cost of Capital
The marginal cost of capital is the cost of raising one more rupee of new capital, over and above the funds the firm is already using. As a company raises more debt or equity, its risk profile can change (for example, higher leverage), and the incremental cost of fresh capital may rise.
Businesses look at marginal cost when deciding whether to take up a new project: the expected return on that project should at least match the marginal cost of the additional funds needed, not just the historical average cost.
6. The Weighted Average Cost of Capital (WACC)
The Weighted Average Cost of Capital (WACC) adds up the costs of debt and equity based on how much of each type of capital the company has.
WACC = (E/V) × Ke + (D/V) × Kd (1 - T)
- E is the market value of equity
- D = The market value of debt
- V = Total capital (E + D)
The weighted cost of capital formula helps figure out the minimum return required to satisfy both the debts and as well as equity investors.
Why is the Calculation of Cost of Capital Important?
The cost of capital is important for more than just maths. It's an important part of:
- Making decisions about capital budgeting, like figuring out if a project is possible using NPV or IRR.
- Valuation of companies, which means figuring out their intrinsic value using a discount rate.
- Financing strategy: deciding whether to get money through debt or equity.
- Performance measurement helps you figure out if the returns are worth the risks.
A lower cost of capital is seen by investors and analysts as a sign of financial strength and stability.
Related reading: Cost of capital is an important parameter and knowing various aspects of it is necessary to optimise the operations and profitability of the business. Read here “Fixed Capital vs Working Capital: What's the difference?” to know more.
Example and Formula for the Cost of Capital
Let's look at a simple example of the cost of capital.
The company has ₹60 crore in equity and ₹40 crore in debt to pay for its business.
- The cost of equity is 12%.
- Debt costs 8%
- 30% tax rate
WACC = (E/V) × Ke + (D/V) × Kd (1 - T)
- E is the market value of equity
- D = The market value of debt
- V = Total capital (E + D)
W ACC= {60}/{100} × 12% + {40}/{100} × 8% × (1 - 0.3)
WACC = 7.2+2.24=9.44%
So, the company's weighted cost of capital is 9.44%. Any project that makes less than this would lose value.
The Importance of the Cost of Capital in Financial Choices
The importance of the cost of capital is that it helps people make decisions.
1. Assessing Investments
Shareholders get richer when projects make more money than the cost of capital, which is the minimum return they need. NPV and IRR are two tools that depend on this measure.
2. Decisions about how to mix financing
A perfect mix of debt and equity lowers WACC. Having too much debt increases financial leverage and risk, while having too much equity can dilute existing shareholders and as well as raise the overall cost of capital.
3. Valuation of a company
The company's cost of capital is used by investors to figure out how much future cash flows are worth. A lower rate means a higher value, which shows that investors are confident and the company is financially stable.
4. Benchmarking for strategy
Businesses use the cost of capital to see how well they are doing compared to other companies or industry standards. It shows how the market sees the risk and return potential.
Useful Information for Businesses
- Keep an eye on changes in the market. Watch the risk-free rate, tax laws, and market risk premium.
- Look over your capital structure. Change the balance between debt and equity every so often to keep WACC in check.
- Make realistic assumptions. If you think you'll get more than you actually will, it can lead to bad investment decisions.
- Set a standard for your costs. Look at what other companies in your field are doing to find problems.
- Work with NBFCs and lenders you can trust. Stable access to capital and transparent terms matter for long-term planning.
Conclusion
The cost of capital is more than just a number—it shows how smartly a company uses its money and how much confidence investors have in it. When businesses understand its types, parts, and impact, they can make better, data-backed decisions.
For Indian companies, especially when interest rates change, managing the cost of capital well can support steady growth and reduce risk. By handling their finances wisely and partnering with trusted names like Shriram Finance, businesses can face risks better and build steady, long-term growth. Check our website for more information.
FAQs
What are some common errors people make when figuring out the cost of capital?
Companies usually often don't take into account the market value of their debt and equity, use book values, or don't account for taxes. Some people think that WACC doesn't change, which can lead to bad project evaluations.
Is WACC the same for every project in a company?
No. There are different levels of risk for each project. To show the right expected returns, companies may raise WACC for riskier projects or lower it for safer ones.
What does "Marginal Cost of Capital" mean?
The marginal cost of capital (MCC) is the extra cost a company pays when it raises one more unit of money. It shows how getting new funds affects the overall cost of financing.
Does a bigger debt part always lower WACC?
Not always. Debt is cheaper initially because interest is tax-deductible. But if a company borrows too much, the risk increases. Lenders may charge higher rates and as well as equity investors may expect more return. This can push up the overall WACC instead of reducing it.
What is the difference between Cost of Capital and Required Rate of Return?
Cost of Capital is the lowest return that the company will accept (or still continue with the project), while the Required Rate of Return is what investors think the company should return. For a balanced valuation, they should be in line with each other.