WACC — The Real Cost of Capital (Where Everything Comes Together)

Core Claim: A company creates value only when it earns returns higher than its WACC, Not just Cost of Equity or Cost of Debt individually.

Series Continuity (Don't Break the Chain)

This article is part of the Financial Modelling & Valuation Series.

In previous articles:

Now: We combine all components into WACC, The final cost of capital used in valuation.

Big Picture: Cost of Capital → WACC → ROIC Comparison → Valuation → Intrinsic Value

What is WACC?

WACC (Weighted Average Cost of Capital) is the blended cost of all capital sources:

Equity
Debt
Preference Shares

WACC Formula

WACC = (E/V × Ke) + (D/V × Kd × (1−T)) + (P/V × Kp)

What are Weights? (Most Misunderstood Concept)

Weights = Proportion of each capital source in total capital

Formula:

E/V = Equity ÷ Total Capital
D/V = Debt ÷ Total Capital
P/V = Preference ÷ Total Capital

Critical Rule: Always use Market Value, Not Book Value.

Example (Market Value Based)

Equity = ₹60,000 Cr
Debt = ₹30,000 Cr
Preference = ₹10,000 Cr
Total = ₹1,00,000 Cr

E/V = 60%
D/V = 30%
P/V = 10%

Step-by-Step WACC Calculation

Assign Costs

Cost of Equity (Ke) = 14%
Cost of Debt (Kd) = 8%
Tax Rate = 25%
After-tax Kd = 6%
Cost of Preference (Kp) = 10%

Apply Formula

WACC = (0.6×14%) + (0.3×6%) + (0.1×10%)

= 8.4% + 1.8% + 1% = 11.2%

What is ROIC? (The Comparison Metric)

ROIC (Return on Invested Capital) measures how efficiently a company generates returns from capital.

Formula:

ROIC = NOPAT ÷ Invested Capital

NOPAT = Net Operating Profit After Tax
Invested Capital = Equity + Debt (excluding non-operating assets)

Interpretation: ROIC shows actual performance; WACC shows required performance.

Final Decision Rule (Core of Valuation)

ROIC > WACC → Value Creation
ROIC < WACC → Value Destruction

Reality: Profits alone don't create value — only excess returns do.

RBI Policy & WACC (Advanced Insight)

Repo Rate ↑ → Cost of Debt ↑ → WACC ↑
Market Risk ↑ → Cost of Equity ↑ → WACC ↑

Impact:

Higher WACC → Lower valuation
Lower WACC → Higher valuation

Key Risk: Rising interest rates can destroy valuation even if profits remain stable.

DCF Link (Why WACC Matters Most)

WACC is used as the discount rate in DCF valuation.

Higher WACC → Lower present value of future cash flows

Lower WACC → Higher valuation

Optimal Capital Structure (Advanced Insight)

Adding debt initially lowers WACC (tax benefit)
Too much debt increases risk → increases WACC

Conclusion: There exists an optimal balance between debt and equity.

Comparison Table — ROIC vs WACC

Company	ROIC	WACC	Value Creation
Tata Steel	13%	12%	⚠️ Weak
UltraTech Cement	16%	12%	✅ Strong
ONGC	11%	11.5%	❌ Destroying

Common Mistakes

Using book value weights
Ignoring preference shares
Using outdated WACC
Ignoring macro factors

Golden Rule

Value is created only when returns exceed WACC — Consistently.

Final Conclusion

WACC is the single most important number in valuation. It connects capital structure, risk, and return into one framework.

If you understand WACC, you understand valuation.

Disclaimer: This content is for educational purposes only and does not constitute financial or investment advice. Please conduct your own research or consult a qualified advisor before making any financial decisions. Investing involves risk, and past performance does not guarantee future results.