What is Weighted Average Cost of Capital (WACC)?

WACC is the blended average rate of return a company must pay to all capital providers (equity shareholders and debt lenders) to finance its business operations and assets.

How does the interest tax shield affect WACC?

Because interest payments on debt are tax-deductible expenses, debt financing provides a tax shield that reduces the effective cost of debt to Rd * (1 - Tc), lowering overall WACC.

How is Cost of Equity calculated in WACC?

The Cost of Equity is primarily calculated using the Capital Asset Pricing Model (CAPM): Re = Rf + Beta * (Rm - Rf), where Rf is the risk-free rate, Beta measures systemic risk, and (Rm - Rf) is the equity risk premium.

What is Weighted Average Cost of Capital (WACC)?

WACC is the blended average rate of return a company must pay to all capital providers to finance its operations.

How does the interest tax shield affect WACC?

Debt interest payments are tax-deductible, reducing effective cost of debt to Rd * (1 - Tc) and lowering overall WACC.

How is Cost of Equity calculated in WACC?

Cost of equity is calculated via CAPM: Re = Rf + Beta * (Rm - Rf).

WACC & Cost of Capital Calculator Online

Calculate Weighted Average Cost of Capital (WACC), CAPM cost of equity, after-tax debt tax shield, and DCF hurdle rates. 100% private.

Running automated V8 WACC & CAPM financial verification... TESTING

⚖️ Capital Structure & Inputs

1. Capital Structure ($)

Market Value of Equity ($E)

Market Value of Debt ($D)

2. Cost of Equity (CAPM %)

Risk-Free Rate (Rf %)

Equity Beta (β)

Equity Risk Premium (Rm - Rf %)

3. Cost of Debt & Tax Shield (%)

Pre-Tax Cost of Debt (Rd %)

Corporate Tax Rate (Tc %)

📊 WACC & Discount Rate Output

Blended WACC

8.08%

DCF Hurdle Rate Baseline

Cost of Equity (Re)

10.33%

CAPM Derived Rate

Capital Component	Weight	Effective Cost
Equity (E/V)	60.0%	10.33% (Cost: 6.20%)
Debt (D/V)	40.0%	4.74% after tax (Cost: 1.90%)
Pre-Tax Cost of Debt (Rd)	-	6.00%
Tax Shield Saving	-	-1.26% (Tc: 21.0%)
Total Firm Capital (V)	$1,000,000,000

Mastering Weighted Average Cost of Capital (WACC)

WACC is the foundational cornerstone of corporate finance and valuation. It serves as the discount rate to calculate the Net Present Value (NPV) of future Free Cash Flows (FCFF). A lower WACC increases firm valuation, which is why optimizing capital structure between equity and tax-deductible debt is a primary objective for CFOs.

Why is debt generally cheaper than equity?

Debt holders have senior priority on assets in liquidation and guaranteed interest payments, carrying less risk than common equity holders who bear residual risk. Furthermore, debt interest is tax-deductible, creating an interest tax shield.

What is the Capital Asset Pricing Model (CAPM)?

CAPM links expected equity returns to systemic market risk: Re = Rf + Beta * ERP. A Beta higher than 1.0 means the stock is more volatile than the market, demanding a higher required return from shareholders.

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