WACC is the average rate of return a company must pay to all its security holders (debt and equity). It's the hurdle rate for investment decisions.
Company: $6B equity, $4B debt, cost of equity 12%, cost of debt 6%, tax rate 25%. WACC = (6/10 × 12%) + (4/10 × 6% × 75%) = 7.2% + 1.8% = 9.0%.
If a project's expected return exceeds WACC, it creates value. If below, it destroys value. Companies with lower WACC can invest more profitably. WACC is used in DCF valuations as the discount rate — it's the single most important number in corporate finance.
WACC varies significantly by industry based on business risk, capital structure, and market conditions. Here are representative benchmarks from NYU Stern (Damodaran) and industry sources:
| Industry | Average WACC | Why It's High/Low |
|---|---|---|
| Software / SaaS | 9.0-11.5% | High growth risk, mostly equity-financed |
| Semiconductors | 9.3-10.5% | Cyclical demand, high R&D costs |
| Utilities (Regulated) | 6.0-7.5% | Stable cash flows, high debt (tax shield) |
| Real Estate (REITs) | 5.5-7.5% | Asset-backed, predictable income |
| Financial Services | 8.0-10.0% | Regulatory risk, leverage |
| Retail | 7.5-9.0% | Moderate risk, mixed capital structure |
Let's calculate WACC for a mid-cap software company with realistic numbers:
WACC = (E/V × Re) + (D/V × Rd × (1-T))
WACC = (6/8 × 12%) + (2/8 × 6.5% × 79%)
WACC = 9.0% + 1.3% = 10.3%
This means the company must earn at least 10.3% on new projects to create shareholder value. A project returning 8% would destroy value despite being profitable on paper.
💡 Pro Tip: WACC as a Sanity Check
When valuing a stock with DCF, small changes in WACC dramatically affect fair value. A 1% change in WACC can shift a stock's calculated fair value by 15-25%. Always run a sensitivity analysis: calculate DCF value at WACC ±1% and ±2% to see the range. If your buy thesis only works at the very lowest WACC, you're probably too optimistic.
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Most companies have a WACC between 6-12%. Capital-intensive businesses like utilities tend to have lower WACC (5-7%) due to stable cash flows and high debt capacity. Tech startups can have WACC above 15% due to higher risk. The lower the WACC, the less the company needs to earn on investments to create shareholder value.
Why does WACC matter for investors?
WACC is the "hurdle rate" — any project must return more than WACC to create value. If a company earns 15% ROIC with a 10% WACC, it's creating 5% of value per dollar invested. If ROIC is below WACC, the company is destroying value regardless of how fast it grows. This is the core of value investing analysis.
How is WACC calculated?
WACC = (E/V × Re) + (D/V × Rd × (1-T)), where E = equity value, D = debt value, V = total value, Re = cost of equity (from CAPM), Rd = cost of debt, and T = tax rate. The tax shield on debt (1-T) is why some debt can lower WACC — interest payments are tax-deductible.