Cost of Equity

Cost of equity is the return that equity investors expect for their risk. Because shareholders are paid only after all creditors, they require compensation for this higher risk. In company valuation, it is a central metric for determining value. It is an opportunity cost rather than a payment: unlike interest it appears nowhere in the income statement, yet it directly affects value through the discount rate.

It is normally derived from the capital asset pricing model as the risk-free rate plus beta multiplied by the market risk premium. For unlisted companies, premiums are added in practice, for example for size or limited tradability. A premium added to the cost of equity reduces calculated value. Alternatively, a separate value discount may be used under appropriate assumptions. The two approaches are not automatically arithmetically equivalent and must not double-count the same risk. In Germany professional practice follows IDW principles, documenting and justifying base rate, market risk premium and beta. The link to capital structure matters: rising leverage increases shareholders' risk and therefore their required return, which partly consumes the advantage of cheaper debt. Financial sponsors express the same requirement less as a model input than as a target return, for example a target internal rate of return or a multiple on invested capital over the holding period. The two metrics describe different aspects of returns and cannot be equated without a holding-period assumption.

In valuation the cost of equity feeds together with the cost of debt and the target capital structure into the weighted average cost of capital. In practice it is worth comparing the modelled rate with the actual return requirements of the buyer groups in question, because the two can diverge considerably: a family business with a long horizon may have different return requirements from a fund with a limited life, and a strategic buyer also counts on synergies. For the price achievable, what matters is therefore less the model value than which type of buyer actually bids in the process.