Weighted Average Cost of Capital (WACC)

Weighted Average Cost of Capital, or WACC, combines the cost of debt and equity based on their share in a company’s total funding.

• It shows the overall cost of financing a business.
• It considers the market value of debt and equity.
• The cost of debt is adjusted for tax.
• Companies use WACC to assess projects and funding decisions.
• Investors may use it to understand a company’s financing costs.
• A higher WACC generally indicates higher funding costs.
• WACC may not suit projects whose risks differ greatly from the company’s normal operations.
   

Weighted Average Cost of Capital, or WACC, is the average rate a company pays to raise money through debt and equity.
Companies may borrow money from lenders or raise funds from shareholders. Each source has a different cost. WACC combines these costs according to the proportion of debt and equity in the company’s total capital.
For example, if a company raises more money through equity than debt, the cost of equity will have a greater effect on its WACC.
 

The formula is:

WACC = (E/V × Re) + (D/V × Rd × (1 − T))

Where:

• E is the market value of equity.
• D is the market value of debt.
• V is the total value of debt and equity.
• Re is the cost of equity.
• Rd is the cost of debt.

• T is the applicable tax rate.

  
  

The cost of debt is adjusted for tax because interest expenses may reduce taxable income.

Suppose equity forms 60% of a company’s capital and debt forms 40%. The cost of equity is 12%, the cost of debt is 8%, and the tax rate is 25%.

WACC = (60% × 12%) + (40% × 8% × (1 − 25%))

WACC = 7.2% + 2.4% = 9.6%

This means the company’s average financing cost is 9.6%.

The cost of equity is the return shareholders expect for investing in a company. Two common methods used to estimate it are the Capital Asset Pricing Model and the Dividend Capitalisation Model.

Capital Asset Pricing Model

The CAPM formula is:

E(Ri) = Rf + βi × (E(Rm) − Rf)

Where:

• E(Ri) is the expected return.
• Rf is the risk-free rate.
• βi is beta, which measures the investment’s sensitivity to market movements.
• E(Rm) is the expected market return.
• E(Rm) − Rf is the market risk premium.

For example, suppose the risk-free rate is 6%, the expected market return is 11%, and beta is 1.2.

Expected return = 6% + 1.2 × (11% − 6%)

Expected return = 12%

The estimated cost of equity is therefore 12%.

Dividend Capitalisation Model

The formula is:

Re = (D1/P0) + g

Where:

• Re is the cost of equity.
• D1 is the expected dividend per share for the next period.
• P0 is the current market price per share.
• g is the expected dividend growth rate.

Suppose the expected dividend is ₹5 per share, the current share price is ₹100, and the expected dividend growth rate is 4%.

Cost of equity = (₹5/₹100) + 4%

Cost of equity = 9%

This method is generally more suitable for companies that pay regular dividends.

WACC and the Required Rate of Return, or RRR, both help assess financial decisions. However, they serve different purposes.

1. What they measure

WACC measures the average cost a company pays for debt and equity. It represents the combined return expected by lenders and shareholders.

RRR is the minimum return an investor expects from a particular investment or project.

2. How they are calculated

WACC considers:

• Cost of equity
• After-tax cost of debt
• Proportion of equity

• Proportion of debt

  
  

RRR may be calculated using methods such as CAPM. It considers the risk-free rate, beta and expected market return.

For example, a company may have a WACC of 9%, but an investor may require a 13% return from a riskier project.

Step 1: Gather financial data

Collect the market value of equity and debt, cost of debt, tax rate and the information required to calculate the cost of equity.

Step 2: Calculate capital proportions

Equity proportion = Equity ÷ (Equity + Debt)

Debt proportion = Debt ÷ (Equity + Debt)

Step 3: Calculate the cost of equity

Use CAPM or the Dividend Capitalisation Model.

Cost of equity = (Expected dividend per share ÷ Current share price) + Growth rate

Step 4: Calculate the weighted cost of equity

Weighted cost of equity = Equity proportion × Cost of equity

Step 5: Find the cost of debt

Use the company’s average borrowing cost or the return required by its lenders.

Step 6: Adjust the debt cost for tax

After-tax cost of debt = Cost of debt × (1 − Tax rate)

Step 7: Calculate the weighted cost of debt

Weighted cost of debt = Debt proportion × After-tax cost of debt

Step 8: Add both costs

WACC = Weighted cost of equity + Weighted cost of debt

If the weighted cost of equity is 7.2% and the weighted cost of debt is 2.4%, WACC is 9.6%.

1. It can be difficult to calculate accurately

WACC depends on market values, tax rates, interest rates, beta and expected returns. These values may change over time.

It may also be difficult to calculate when a company has different types of debt with different interest rates.

2. It may not suit high-risk projects

A company-wide WACC reflects the average risk of its existing operations. It may not be suitable for a project with a much higher or lower level of risk.

For example, a stable company entering a new and uncertain industry may need to use a higher project-specific discount rate. In some cases, approaches such as Adjusted Present Value may be more suitable.

Companies use WACC to assess projects, business investments and financing decisions. It helps them compare the expected return from a project with the cost of funding it.
If the expected return is above the relevant WACC, the project may create value. If it is below WACC, the project may not cover its financing cost.
Investors and creditors may also use WACC to understand a company’s funding position. A higher WACC generally means higher financing costs, while a lower WACC generally means lower financing costs.
 

Weighted Average Cost of Capital helps a company understand the combined cost of raising funds through debt and equity. It supports project evaluation, business valuation and financing decisions by showing the return needed to cover funding costs. However, WACC depends on estimates such as market values, interest rates, tax rates and expected returns. It may also be unsuitable for projects with very different risk levels. Therefore, companies and investors should review the inputs carefully before using WACC for decisions confidently.