WSU Lexicon: Corporate Issuers

Cost of Equity

Cost of equity is the rate of return shareholders require for holding a company's shares, given the risk they bear. It is an opportunity cost rather than a cash outlay, and is typically estimated with the CAPM, a dividend discount model, or a bond-yield-plus-risk-premium build-up.

It is the equity component input to the weighted average cost of capital.

The entry

Three Estimation Routes and the Assumptions Behind Each

The capital asset pricing model builds the required return from three inputs: the risk-free rate, the equity risk premium, and beta. In words, take the risk-free rate and add beta multiplied by the equity risk premium, where beta measures the stock's sensitivity to broad market movements. The model assumes only systematic risk is priced, so company-specific risk earns no compensation.

A dividend discount approach inverts the valuation equation instead. Under constant growth, the required return equals next year's expected dividend divided by the current share price, plus the sustainable growth rate. It works only for firms paying stable, predictable dividends, and it is highly sensitive to the growth assumption.

The bond-yield-plus-risk-premium build-up starts from the company's own long-term debt yield and adds a judgmental premium for the extra risk equity holders bear. It is pragmatic for firms with traded debt but no reliable beta.

The entry

Beta, Leverage and the Problem of Private Companies

Beta is normally estimated by regressing a stock's returns on a market index, but the raw estimate is noisy and often adjusted toward one to reflect mean reversion. A more serious issue is that observed beta embeds the firm's existing capital structure: financial leverage magnifies the volatility of equity returns, so a levered beta is always at least as high as the underlying asset beta.

For a private company or a new division, analysts take a comparable listed firm's beta, strip out its leverage to obtain an asset beta, then re-lever it using the subject company's target debt-to-equity ratio and tax rate. This pure-play method is standard practice in project appraisal, where the relevant risk is the project's, not the parent's.

Small, illiquid or emerging-market issuers frequently attract further add-ons, most commonly a country risk premium layered onto the equity risk premium.

The entry

Where the Cost of Equity Bites in Practice

No income statement or balance sheet reports the cost of equity, yet it drives more corporate decisions than most reported figures. It is the equity weight's input into the weighted average cost of capital, which becomes the hurdle rate for capital budgeting and the discount rate in free-cash-flow-to-firm valuation. Because equity is the more expensive component, small changes in it move enterprise values materially, especially for firms whose cash flows sit far in the future.

It also frames capital allocation choices. A management team deciding between a buyback, a dividend, and an internal project is implicitly comparing the project's expected return with what shareholders could earn on comparable-risk alternatives. Regulators of utilities set allowed returns using explicit cost-of-equity estimates, and disputes in rate cases often turn precisely on the equity risk premium and beta chosen.

The entry

Exam-Level Competencies to Secure

Candidates should be able to compute a required return from each of the three approaches given the standard inputs, and to explain why the same company can yield materially different estimates depending on the method. Expect to be asked which approach is defensible for a given issuer: a mature dividend payer, a non-dividend-paying growth firm, a private target, or a subsidiary in a different industry from its parent.

Equally testable is directional reasoning. Know that a rise in the risk-free rate, an increase in beta, additional leverage, a wider country risk premium, or a fall in the share price with dividends unchanged all raise the estimated cost of equity. Finally, be comfortable unlevering and relevering beta, and remember that the tax shield affects the cost of debt in the weighted average calculation, never the cost of equity itself.

Common trap

“Financing with retained earnings is free, because the company pays nothing out to shareholders.”

Retained earnings belong to shareholders, so reinvesting them forgoes the return they could earn elsewhere at equal risk. Internally generated equity carries essentially the same required return as new shares, less any issuance costs.

In practice

Rising discount rates in 2022

As central banks lifted policy rates through 2022, government bond yields rose sharply. Because the risk-free rate feeds directly into CAPM, required equity returns rose too, and long-duration growth equities repriced downward most severely.

Candidates ask

Questions on this term

Why is the cost of equity almost always higher than the cost of debt?Shareholders rank last in liquidation, receive no contractual payments, and bear residual cash-flow volatility, so they require more. Interest is also tax-deductible in most regimes, pushing debt's after-tax cost lower still.
Which estimation method should I use for a given company?Use CAPM when a reliable beta and market data exist; it is the default at Level I. Use the dividend discount inversion only for mature firms with stable, forecastable dividends and a meaningful payout. Use bond yield plus a risk premium when the issuer has traded debt but no usable beta, such as a thinly traded or recently listed company. For private firms or divisions, take a pure-play comparable's beta and relever it to the target structure.
Does taking on more debt change the cost of equity?Yes. Leverage does not alter the riskiness of the underlying assets, but it concentrates that risk in a smaller equity base, so equity returns become more volatile and shareholders demand a higher return. Formally, levered beta rises with the debt-to-equity ratio. This is why a firm can add cheap debt and still see its weighted average cost of capital fall only up to a point, after which rising equity and debt costs offset the tax benefit.

Related entries

Capital Asset Pricing ModelThe Capital Asset Pricing Model states that an asset's expected return equals the risk-free rate plus its beta multiplied by the equity risk premium.
Cost of DebtCost of debt is the rate of return lenders require to hold a company's debt, measured as the current market yield on its borrowings rather than the historical coupon.
Gordon Growth ModelThe Gordon growth model values a share as next year's expected dividend divided by the required return on equity minus a constant dividend growth rate (V0 = D1 / (r − g)).
Weighted Average Cost of CapitalThe weighted average cost of capital (WACC) is a firm's blended required return across all capital providers, calculated by weighting the after-tax cost of debt and the cost of equity by each source's proportion of total capital.

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Cost of Equity

It is the equity component input to the weighted average cost of capital.