Weighted Average Cost of Capital (WACC)

## What it is The Weighted Average Cost of Capital is the blended rate of return a company must earn to satisfy all its capital providers — both lenders and shareholders. It weights the cost of equity and the after-tax cost of debt by their respective shares in the company's capital structure. In short, WACC is the minimum return a company needs to generate to create value rather than destroy it.

## The formula in plain terms WACC = (proportion of equity × cost of equity) + (proportion of debt × cost of debt × (1 − tax rate)). Two things stand out:

- Cost of equity is usually estimated via the Capital Asset Pricing Model (CAPM): the risk-free rate (in India, the 10-year G-Sec yield, typically ~6.5–7%) plus the stock's beta × the equity-risk premium. - Cost of debt is the interest rate on borrowings, multiplied by (1 − tax rate) because interest is tax-deductible — the "tax shield" makes debt cheaper than its headline rate.

## Why it matters WACC is the discount rate at the heart of valuation. In a Discounted Cash Flow (DCF) model, future free cash flows are discounted back at WACC to estimate intrinsic value — so a higher WACC means a *lower* valuation, and vice versa. It's also the hurdle rate companies use for capital-budgeting: a project should be undertaken only if its expected return exceeds WACC. A company consistently earning ROCE/ROIC above its WACC is creating shareholder value; one earning below it is eroding value despite being profitable on paper.

## The Indian context - India's higher risk-free rate (G-Sec yields ~7% vs near-zero in some developed markets in the past) and a larger equity-risk premium mean Indian companies typically have a higher WACC than developed-market peers — which is one reason Indian DCF valuations use steeper discount rates. - Corporate tax cuts (the 22%/15% concessional rates under Sections 115BAA/115BAB) lower the after-tax cost of debt, nudging WACC down. - Capital structure matters: adding cheap debt can lower WACC up to a point, but too much leverage raises financial risk, pushing both debt and equity costs up — so there's an optimal mix.

Bottom line: WACC is the yardstick for whether a company's returns justify the cost of the money it uses. As an investor, compare a firm's ROIC against its WACC — sustained ROIC above WACC is the signature of genuine value creation, and WACC is the rate you'd plug into any DCF to judge what the stock is really worth.