18.3 Cost of Capital
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18.3
Cost of Capital
Relevant cash fl ows are incremental after-tax cash fl ows. To be consistent, these cash fl ows
must be discounted using an incremental after-tax cost of capital. The fi rm’s relevant cost of
capital is computed from after-tax fi nancing costs. Firms pay preferred and common stock
dividends out of net income, so these expenses represent after-tax costs to the fi rm. Because
debt interest is paid from pretax income, the cost of debt requires adjustment to an after-tax
basis before computing the cost of capital.
A project’s incremental cash fl ows must be discounted at a cost of capital that represents
the incremental or marginal cost to the fi rm for fi nancing the project; that is, the cost of raising
one additional dollar of capital. Thus, the cost of debt and equity that determines the cost of
capital must not come from historical averages or past costs but must come from projections of
future costs. The fi rm’s analysts must evaluate investors’ expected returns under likely market
conditions and use these expected returns to compute the fi rm’s marginal future cost of raising
funds by each method.
Conceptually, investors’ required returns equal the fi rm’s fi nancing costs. The following
sections use the valuation concepts for bonds and stocks from Chapter 10 to fi nd investors’
required returns on bonds, preferred stock, and common stock. We then adjust these required
returns to refl ect the fi rm’s after-tax cost of fi nancing.
Cost of Debt
The fi rm’s unadjusted cost of debt fi nancing equals the yield to maturity (YTM) on new debt
issues, either a long-term bank loan or a bond issue. The YTM represents the cost to the fi rm
of borrowing funds in the current market environment. The fi rm’s current fi nancing costs
determine its current cost of capital.
A fi rm can determine its cost of debt by several methods. If the fi rm targets an “A” rating
(or any other bond rating), a review of the yields to maturity on A-rated bonds in Standard
& Poor’s Bond Guide can provide an estimate of the fi rm’s current borrowing costs. Several
additional factors will aff ect the fi rm’s specifi c borrowing costs, including covenants and fea-
tures of the proposed bond issue as well as the number of years until the bond or loan matures,
or comes due. It is important to examine bonds whose ratings and characteristics resemble
those the fi rm wants to match.
In addition, the fi rm can solicit the advice of investment bankers on the cost of issuing
new debt. Or if the fi rm has debt currently trading, it can use public market prices and yields
to estimate its current cost of debt. The publicly traded bond’s yield to maturity can be found
using the techniques for determining the internal rate of return on an investment discussed in
Chapters 9 and 10. Finally, a fi rm can seek long-term debt fi nancing from a bank or a consor-
tium of banks. Preliminary discussions with the bankers will indicate a ballpark interest rate
the fi rm can expect to pay on its borrowing.
The yield estimate, however derived, is an estimate of the coupon rate on newly issued
bonds (as bonds are usually issued with prices close to their par value) or the interest rate on a
loan. Interest is a pretax expense, so the interest estimate should be adjusted to refl ect the tax
shield provided by debt fi nancing. If the YTM is the pretax interest cost estimate, the after-tax
estimate is YTM times (1 –
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