WEIGHTED AVERAGE COST OF CAPITAL (WACC)

Saturday Brainstorming Thought (314) 14/02/2026

By:-Er. Avinash Kulkarni
9822011051

Chartered Engineer, Govt Regd Valuer, IBBI Regd Valuer,

Rera Certified Consultant, Black Money Act Regd Valuer

Weighted Average Cost of Capital (WACC) is the average rate a company expects to pay to all its security holders (debt and equity) to finance its assets

It serves as a benchmark for investment, decisions and the minimum return necessary to satisfy creditors and investors

A higher WACC indicates more risk

Key Components & formula for WACC

WACC = (E/V X Re) + (D/V X Rd X (1 – T)

E = Market value of equity

D = Market value of debt

V = Total value of capital (E + D)

Re = Cost of equity (often calculated via CAPM)

Rd = Cost of debt

T = Corporate tax rate

Important Considerations in WACC

1) After – Tax Cost of Debt

Because interest payments are tax-deductible, the cost of debt is adjusted to (1 – tax rate)

2 Market value Vs Book value

WACC should use the market value of debt and equity, not their book values

3) Usage

It is heavily used in DCF analysis to determine the net present value of future cash flows

Limitations of WACC

WACC relies on market fluctuations and assumes a constant capital structure, which may not hold true, potentially making it less reliable for rapidly changing companies

Ket Takeaways of WACC

1) Weighted Average Cost of Capital (WACC) is a critical financial metric that combines the cost of equity and debt, reflecting the average rate a company must pay to finance its business

2) WACC is widely used by investors and company management as it serves both as a discount rate in cash flow analysis and as a benchmark for evaluating investment opportunities

3) Calculating WACC involves determining the market value proportions of debt and equity financing and it accounts for tax advantages associated with interest expenses

4) While WACC provides valuable insights into a company’s financial health, its calculation can be complex due to varying assumptions and requires careful consideration of market conditions and inputs

Calculating WACC in Excel

1) Step 1 – Gather financial Data

A) Market value of equity and debt

B) Dividend per share

C) Current stock price

D) Interest rate on debt

E) Company’s tax rate

2) Step 2 – Determine Capital Structure Proportions

A) Equity Proportion = Equity / ( Equity + Debt)

B) Debt Proportion =
Debt / (Equity + Debt)

3) Step 3 – Calculate Cost of Equity

Use the Dividend Discount Model

Cost of Equity = (Dividend per share/ Current stock price) + Growth rate

Or use CAPM if appropriate

4) Step 4 – Compute Proportional Cost of Equity

= Equity Proportion X Cost of Equity

5) Step 5 – Find the Cost of Debt

Use the average interest rate the company pays on its borrowings

6) Step 6 – Adjust for rax

After – Tax cost of Debt = Cost of Debt = (1 – Tax Rate)

7) Step 7 – Compute Proportional Cost of Debt

= Debt Proportion X After – Tax Cost of Debt

8) Step 8 – Add to get WACC

WACC = Proportional Cost of Equity + Proportional Cost of Debt

Cost of Capital

1) It is the cost of investing the same money in different investments having similar risk and other characteristics

2) From a financing angle, cost of capital is simply the cost which is paid for using the capital

3) A percentage return on investment that convinces an investor to invest in a particular project or company is the appropriate cost of capital for that investor

4) Cost of Capital is the required return necessary to make a capital budgeting project, such as building a new factory, worthwhile

Cost of Equity Capital

= Risk Free Rate + Beta ( Market Risk Premium – Risk-Free Rate)

Cost of Debt Capital

= Interest Rate (1 – Tax Rate)

Sources of Capital

All sources of Capital including

1) Common Stock

2) Preferred Stock

3) Bonds

4) Any other long-term debt

Users of WACC