WACC: An important indicator that investors need to know

Deciding to invest in a particular project is not an easy task. Investors need to assess whether the expected profits are commensurate with the risks and financial costs. While many often focus solely on the expected rate of return, there is another equally important factor: the cost of capital, which can be calculated using the WACC or Weighted Average Cost of Capital. This is why financial analysts commonly use the WACC to aid investment decision-making.

What is the Weighted Average Cost of Capital (WACC)?

WACC measures the average cost that a company must pay to obtain capital for its operations. In other words, it is the weighted average cost of all sources of capital, including debt and equity. When a company needs to raise funds for a project, it must pay for that money, whether through borrowing or issuing shares. The WACC helps us understand the total cost involved.

Investors compare the WACC with the expected rate of return. If the return exceeds the WACC, the investment is considered valuable. If it is lower, the project may not be worthwhile.

Components of WACC

The WACC consists of two main components of capital costs:

Cost of Debt(

This is the expense incurred from borrowing money from banks or financial institutions, expressed as an annual interest rate. For example, if a company borrows at an interest rate of 7% per year, its debt cost is 7%.

) Cost of Equity###

This is the expected return that shareholders anticipate from their investment, typically higher than the cost of debt due to increased risk.

How to Calculate WACC

When a company uses only one source of capital, calculating the cost is straightforward. However, most companies use both debt and equity, so a weighted average calculation is necessary, using the formula:

WACC = (D/V × Rd × )1 - Tc(( + )E/V × Re)

where:

• D/V = proportion of debt relative to total value
• Rd = cost of debt (interest rate)
• Tc = corporate tax rate
• E/V = proportion of equity relative to total value
• Re = cost of equity (expected rate of return)

Practical Example of WACC Calculation

Suppose a company named ABC has the following capital structure:

• Debt: 100 million THB (60% of total value)
• Equity: 160 million THB (40% of total value)
• Borrowing interest rate: 7% per year
• Corporate tax rate: 20%
• Expected return for shareholders: 15%

Plugging into the formula:

WACC = (100/260 × 0.07 × 0.8) + (160/260 × 0.15(

WACC = )0.3846 × 0.07 × 0.8) + (0.6154 × 0.15)

WACC = 0.0215 + 0.0923 = 0.1138 or 11.38%

This result indicates that ABC’s average capital cost is 11.38%. If a project yields a return higher than 11.38%, it is considered worthwhile.

When is a WACC considered good?

A low WACC is a positive sign, indicating that the company can raise funds at a lower cost. However, the attractiveness of the WACC also depends on other factors such as:

• Industry in which the company operates (Different industries have different WACC)
• Risk level of new investment projects
• Company’s financial management policies
• Macroeconomic conditions

If the expected return > WACC → the project is worth investing in If the expected return < WACC → the project is not worth investing in

Finding the Optimal Capital Structure

Companies can choose different methods to raise funds, each affecting the WACC differently.

Using only equity (All Equity) results in the highest WACC because shareholders bear all the risk and require higher returns.

Mixing debt and equity can lower the WACC, as debt interest rates are usually lower than shareholders’ expected returns, and interest expenses are tax-deductible, reducing taxable income.

However, excessive borrowing increases financial risk for the company.

Limitations of Using WACC

While WACC is very useful, it has limitations that should be acknowledged:

( It does not account for future changes WACC is calculated based on current data, but factors such as interest rates, debt levels, and shareholder returns may change over time.

) It does not reflect project-specific risk Different investments carry different risks, but WACC uses a single value, which may not be suitable for high-risk projects.

( Complexity in calculation Requires multiple data points and assumptions, which can lead to inaccuracies.

) It is only an estimate Due to various factors, WACC is not an exact figure but a guiding signal.

How to maximize the effectiveness of WACC

1. Use WACC alongside other analytical tools

Do not rely solely on WACC. Combine it with other indicators such as NPV ###Net Present Value### and IRR ###Internal Rate of Return### for a clearer picture.

( 2. Regularly update WACC Interest rates, debt levels, and economic conditions change constantly. Recalculate WACC periodically to ensure decision-making is based on current data.

) 3. Consider project-specific risk For high-risk projects, adjust WACC upward to provide a more realistic assessment.

Key points to remember about WACC

The WACC is a valuable financial metric for investors and managers, helping to understand the cost of capital for the company. It forms a fundamental basis for investment decisions, company valuation, and capital structure management.

However, caution should be exercised when using WACC, considering its limitations such as not reflecting individual project risks, not accounting for future changes, and being an estimate. Investors should use WACC in conjunction with other financial analysis tools to make clearer and more reasonable investment decisions.