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Cost of capital

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Cost of capital

In economics and accounting, the cost of capital is the cost of a company's funds (both debt and equity), or from an investor's point of view is "the required rate of return on a portfolio company's existing securities". It is used to evaluate new projects of a company. It is the minimum return that investors expect for providing capital to the company, thus setting a benchmark that a new project has to meet.

For an investment to be worthwhile, the expected return on capital has to be higher than the cost of capital. Given a number of competing investment opportunities, investors are expected to put their capital to work in order to maximize the return. In other words, the cost of capital is the rate of return that capital could be expected to earn in the best alternative investment of equivalent risk; this is the opportunity cost of capital. If a project is of similar risk to a company's average business activities it is reasonable to use the company's average cost of capital as a basis for the evaluation or cost of capital is a firm's cost of raising funds. However, for projects outside the core business of the company, the current cost of capital may not be the appropriate yardstick to use, as the risks of the businesses are not the same.

A company's securities typically include both debt and equity; one must therefore calculate both the cost of debt and the cost of equity to determine a company's cost of capital. Importantly, both cost of debt and equity must be forward looking, and reflect the expectations of risk and return in the future. This means, for instance, that the past cost of debt is not a good indicator of the actual forward looking cost of debt.

Once cost of debt and cost of equity have been determined, their blend, the weighted average cost of capital (WACC), can be calculated. This WACC can then be used as a discount rate for a project's projected free cash flows to the firm.

Suppose a company considers taking on a project or investment of some kind, for example installing a new piece of machinery in one of their factories. Installing this new machinery will cost money; paying the technicians to install the machinery, transporting the machinery, buying the parts and so on. This new machinery is also expected to generate new profit (otherwise, assuming the company is interested in profit, the company would not consider the project in the first place). So the company will finance the project with two broad categories of finance: issuing debt, by taking out a loan or other debt instrument such as a bond; and issuing equity, usually by issuing new shares.

The new debt-holders and shareholders who have decided to invest in the company to fund this new machinery will expect a return on their investment: debt-holders require interest payments and shareholders require dividends (or capital gain from selling the shares after their value increases). The idea is that some of the profit generated by this new project will be used to repay the debt and satisfy the new shareholders.

Suppose that one of the sources of finance for this new project was a bond (issued at par value) of $200,000 with an interest rate of 5%. This means that the company would issue the bond to some willing investor, who would give the $200,000 to the company which it could then use, for a specified period of time (the term of the bond) to finance its project. The company would also make regular payments to the investor of 5% of the original amount they invested ($10,000), at a yearly or monthly rate depending on the specifics of the bond (these are called coupon payments). At the end of the lifetime of the bond (when the bond matures), the company would return the $200,000 they borrowed.

Suppose the bond had a lifetime of ten years and coupon payments were made yearly. This means that the investor would receive $10,000 every year for ten years, and then finally their $200,000 back at the end of the ten years. From the investor's point of view, their investment of $200,000 would be regained at the end of the ten years (entailing zero gain or loss), but they would have also gained from the coupon payments; the $10,000 per year for ten years would amount to a net gain of $100,000 to the investor. This is the amount that compensates the investor for taking the risk of investing in the company (since, if it happens that the project fails completely and the company goes bankrupt, there is a chance that the investor does not get their money back).

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