Term
Weighted average cost of capital (WACC)
A BudgetBurrow glossary entry. Scroll down for a plain-English definition and related concepts.
A BudgetBurrow glossary entry. Scroll down for a plain-English definition and related concepts.
The weighted average cost of capital (WACC) quantifies the overall rate a company is expected to pay to finance its assets, blending the cost of equity and the cost of debt according to their proportions in the capital structure. WACC represents the minimum return required by all investors—both lenders and shareholders—given the company's risk profile and capital mix.
WACC emerged as financial decision-makers sought a rigorous method to evaluate the combined cost of capital from multiple sources. It was designed to address the challenge of assessing investment opportunities when companies rely on a mix of financing—balancing debt and equity—to fund operations and growth, ensuring a consistent benchmark for value creation.
WACC is calculated by multiplying the cost of each capital component (such as debt and equity) by its respective weight in the company’s capital structure, then summing the results. The cost of debt is adjusted for tax benefits where interest is deductible, while the cost of equity reflects shareholder expectations. This aggregate rate is used as a discount rate to assess whether future project cash flows will generate value above financing costs.
While WACC itself is a standard calculation, variations arise depending on context. For businesses with multiple divisions or in different geographic markets, a segment-specific WACC may be computed to reflect differing risks. Project-specific WACC may also be used for investments with risk profiles distinct from the overall company.
WACC is applied when valuing companies, setting discount rates in discounted cash flow (DCF) analysis, evaluating mergers and acquisitions, and making capital budgeting decisions on new projects. It is also integral in adjusting capital structures or assessing shareholder value impact during debt or equity issuance.
Suppose a company is financed 60% by equity and 40% by debt. Its cost of equity is 10%, and its after-tax cost of debt is 5%. The WACC calculation would be (0.6 × 10%) + (0.4 × 5%) = 8%. This means any investment should yield a return greater than 8% to increase firm value.
WACC serves as a critical benchmark for evaluating whether prospective investments will generate enough return to compensate all capital providers. If a project's expected return falls below WACC, it erodes value rather than creating it, influencing capital allocation, shareholder returns, and overall company growth.
Small adjustments to capital structure or market assumptions can significantly alter WACC, affecting project valuations and corporate strategies. Moreover, using WACC as a universal discount rate can distort decisions if risk is unevenly distributed across a firm’s operations, potentially leading to overinvestment in riskier segments.