
Chapter 18 Capital structure and the required return 479
18.1 INTRODUCTION
Most financing decisions in practice reduce to a choice between debt and equity. The
finance manager wishing to fund a new project, but reluctant to cut dividends or to
make a rights issue, has to consider the borrowing option. In this chapter, we further
examine the arguments for and against using debt to finance company activities and,
in particular, consider the impact of gearing on the overall rate of return that the com-
pany must achieve.
The main advantages of debt capital centre on its relative cost. Debt capital is usu-
ally cheaper than equity because:
1 The pre-tax rate of interest is invariably lower than the return required by share-
holders. This is due to the legal position of lenders who, have a prior claim on the
distribution of the company’s income and who, in a liquidation, precede ordinary
shareholders in the queue for the settlement of claims. Debt is usually secured on
the firm’s assets, which can be sold to pay off lenders in the event of default, i.e.
failure to pay interest and capital according to the pre-agreed schedule.
2 Debt interest can also be set against profit for tax purposes.
3 The administrative and issuing costs are normally lower, e.g. underwriters are not
always required, although legal fees are usually involved.
The downside is that excessively high borrowing levels can lead to inability to meet
debt interest payments in years of poor trading conditions. Shareholders are thus
exposed to a second tier of risk above the inherent business risk of the trading activi-
ty. As a result, rational shareholders seek additional compensation for this extra expo-
sure. In brief, debt is desirable because it is relatively cheap, but there may be limits to
the prudent use of debt financing because, although posing relatively low risk to the
lender, it can be highly risky for the borrower.
In general, larger, well-established companies are likely to have a greater ability to
borrow because they generate more reliable streams of income, enhancing their abili-
ty to service (make interest payments on) debt capital. Ironically, in practice, we often
find that small developing companies that should not over-rely on debt capital are
forced to do so through sheer inability to raise equity, while larger enterprises often
operate with what appear to be very conservative gearing ratios compared with their
borrowing capacities. Against this, we often encounter cases of over-geared enterpris-
es that thought their borrowing levels were safe until they were caught out by adverse
trading conditions.
So is there a ‘correct’ level of debt? Quite how much companies should borrow is
another puzzle in the theory of business finance. There are cogent arguments for and
against the extensive use of debt capital and academics have developed sophisticated
models, which attempt to expose and analyse the key theoretical relationships.
For many years, it was thought advantageous to borrow so long as the company’s
capacity to service the debt was unquestioned. The result would be higher earnings
per share and higher share value, provided the finance raised was invested sensibly.
The dangers of excessive levels of borrowing would be forcibly articulated by the
stock market by a downrating of the shares of a highly geared company. This prompt-
ed the concept of an optimal capital structure which maximised company value.
However, while the critical gearing ratio is thought to depend on factors such as the
steadiness of the company’s cash flow and the saleability of its assets, it has proved
to be like the Holy Grail, highly desirable, but illusory, and difficult to grasp. Some
academics felt that a firmer theoretical underpinning was needed to facilitate the
analysis of capital structure decisions and to offer more helpful guidelines to practis-
ing managers.
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