wacc-computation

WACC Computation

You are a Corporate Finance Manager. Your goal is to determine the minimum return a company must earn on its existing asset base to satisfy its creditors, owners, and other providers of capital.

Initial Assessment

1. Capital Structure

   • Market Value of Equity (Market Cap).
   • Market Value of Debt (or Book Value if Market Value is unavailable).
   • Preferred Stock (if any).

2. Cost of Equity (CAPM)

   • Risk-Free Rate ($R_f$): (e.g., 10-year Treasury yield).
   • Beta ($\beta$): (Raw or Unlevered/Relevered).
   • Equity Risk Premium (ERP).

3. Cost of Debt

   • Pre-tax Cost of Debt ($R_d$): (Yield to Maturity on existing bonds or marginal borrowing rate).
   • Marginal Tax Rate ($T$).

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WACC Framework

The Formula

WACC = (E/V * Re) + (D/V * Rd * (1 - T)) + (P/V * Rp)

• E: Market Value of Equity.
• D: Market Value of Debt.
• P: Value of Preferred Stock.
• V: Total Value (E + D + P).
• Re: Cost of Equity.
• Rd: Cost of Debt.
• Rp: Cost of Preferred Stock.

Priority Order

1. Data Collection (Gathering market prices and rates).
2. Cost of Equity Calculation (Using CAPM).
3. Cost of Debt Calculation (After-tax).
4. Weighting (Using Market Values, not Book Values).
5. Final Computation & Sensitivity.

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Technical Computation Steps

1. Unlevering/Relevering Beta

• If the target company is private or has a weird capital structure, unlever a peer group's beta and relever it based on the target's D/E ratio.
• β_unlevered = β_levered / (1 + (1-T)*(D/E)).

2. Market Value of Debt

• If market prices are unavailable, treat the book value as a proxy or use the "Synthetic Rating" method based on the Interest Coverage Ratio.

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Output Format

WACC Computation Memo

Summary Table

• Final WACC: (e.g., 8.4%).
• Weight of Equity: (e.g., 70%).
• Weight of Debt: (e.g., 30%).

Component Detail

• Cost of Equity: Breakdown of CAPM inputs ($R_f$, $\beta$, ERP).
• Cost of Debt: Pre-tax rate and tax adjustment.

Sensitivity Matrix

• WACC variance based on different Beta and Equity Risk Premium assumptions.

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Scripts

• calculate.py: CAPM, beta unlevering/relevering, and WACC functions. Run with python3 scripts/calculate.py to self-test; import the functions for actual computations.

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References

• CAPM Guide: Understanding the components.
• Beta Unlevering: The Hamada equation and adjustments.

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Assets

• wacc-memo-template.md: WACC memo with beta workpaper and sensitivity grid.

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Related Skills

• investment-analysis: WACC is the discount rate for DCF models.
• capital-budgeting: WACC is the hurdle rate for project NPV.