{"id":17450,"date":"2026-01-02T23:23:38","date_gmt":"2026-01-02T23:23:38","guid":{"rendered":"https:\/\/www.simtrade.fr\/blog_simtrade\/?p=17450"},"modified":"2026-01-03T15:12:52","modified_gmt":"2026-01-03T15:12:52","slug":"understanding-wacc-student-friendly-guide","status":"publish","type":"post","link":"https:\/\/www.simtrade.fr\/blog_simtrade\/understanding-wacc-student-friendly-guide\/","title":{"rendered":"Understanding WACC: a student-friendly guide"},"content":{"rendered":"\n\"Daniel<\/a>\n\n

In this article, Daniel LEE<\/a> (ESSEC Business School, Global Bachelor in Business Administration (GBBA) \u2013 2023-2027) explains the Weighted Average Cost of Capital (WACC).<\/p>\n\n\n

Introduction<\/h2>\n\n

The Weighted Average Cost of Capital (WACC) is one of the most important concepts in corporate finance and valuation. I know that for some students, it feels abstract or overly technical. In reality, WACC is simpler than we think. <\/p>\n\n

Whether it is a DCF, investment decision or assessing long-term value creation, understanding WACC is essential to interpret the financial world. In a DCF, WACC is used as the discount rate applied for FCF. Moreover, a higher WACC lowers the PV of future cashflows whereas a lower WACC increases the firm value. That is why WACC is a benchmark for value creation.<\/p>\n\n\n

What is the cost of capital?<\/h2>\n\n

Every company needs funding to operate, which comes from two main sources: debt and equity. Debt is provided by banks or bondholders and equity is provided by shareholders. Both expect to be compensated for the risk they take. Shareholders typically require a higher return because they bear greater risk, as they are paid only after all other obligations have been met. In contrast, debt investors mainly expect regular interest payments and face lower risk because they are paid before shareholders in case of financial difficulty. The cost of capital represents the return required by each group of investors, and the Weighted Average Cost of Capital (WACC) combines these required returns into a single percentage.

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The cost of capital is the return required by each investor group and WACC combines these two expectations with a simple %.<\/p>\n\n

Breaking down the WACC formula<\/h2>\n\n

WACC is calculated with this formula: <\/p>\n\n\n

\"Formula<\/a><\/p> \n\n<\/p>To gather these elements, we use several methods such as: <\/p>\n\n

Cost of Equity: CAPM model<\/p>\n\n

Cost of equity = Risk-free rate + \u03b2 (Expected market return – Risk-free rate)<\/p>\n\n

Beta measures how sensitive a company\u2019s returns are to movements in the overall market. It captures systematic risk, meaning the risk that cannot be eliminated through diversification. A beta above 1 indicates that the firm is more volatile than the market, while a beta below 1 means it is less sensitive to market changes. <\/p>\n\n

It is important to distinguish between unlevered beta and levered beta. The unlevered beta reflects only the risk of the firm\u2019s underlying business activities, assuming the company has no debt. It represents the pure business risk of the firm and is especially useful when comparing companies within the same industry, as it removes the effect of different financing choices. This is why analysts often unlever betas from comparable firms and then relever them to match a target capital structure.<\/p>\n\n

The levered beta, on the other hand, includes both business risk and financial risk created by the use of debt. When a company takes on more debt, shareholders face greater risk because interest payments must be made regardless of the firm\u2019s performance. This increases the volatility of equity returns, leading to a higher levered beta and a higher cost of equity.<\/p>\n\n

The risk-free rate represents the return investors can earn without taking any risk and is usually approximated by long-term government bond yields. It acts as the baseline return in the CAPM, since investors will only accept risky investments if they offer a return above this rate. Choosing the correct risk-free rate is important: it should match the currency and the time horizon of the cash flows. Changes in the risk-free rate have a direct impact on the cost of equity and, therefore, on firm valuation.<\/p>\n\n

Cost of Debt<\/p>\n\n

The interest payments are tax-deductible. That\u2019s why we include 1-T in the formula. For example: if a company pays 5% interest annually and the corporate tax rate is 30% then the net cost of debt is 5%*(1-0.3) = 3.5%.<\/p> \n\n

Capital Structure Weights<\/p>\n\n

The weights Equity\/(Equity+Debt) and Debt\/(Equity+Debt) represents the proportion of equity and debt in the company\u2019s balance sheet. We can then assume that a firm with more debt will have a lower WACC because debt is cheaper, but too much debt is risky. That is why the balance is very important for valuation and that usually you use a \u201ctarget capitalization\u201d. Target capitalization is an assumption of the level of debt and equity that a company is expected to have in the long term, rather than the current one.<\/p>\n\n

Understanding risk through the WACC<\/h2>\n\n

WACC is a measure of risk. A higher WACC means the company is riskier and a lower WACC means it\u2019s safer. <\/p> \n\n

WACC is also closely linked to a firm\u2019s capability to create value. If ROIC > WACC then the company creates value, but if ROIC < WACC, the company destroys value. This rule is widely used by CFO and investors to take decisions.<\/p>\n\n

How is WACC used in practice?<\/h2>\n