The after-tax cost of debt for a firm with a pre-tax cost of debt is equal to 10% and a tax rate of 40% is 6%.
The effective interest rate that a business pays on its debts, such as bonds and loans, is known as the cost of debt. The cost of debt may be expressed as either the before-tax cost of debt, which is the amount owed by the business before taxes, or the after-tax cost of debt. The fact that interest expenses are tax deductible accounts for the majority of the difference between the cost of debt before and after taxes.
How is the after-tax cost of debt determined?
The initial cost of debt is the first cost of debt with the impact of the additional income tax rate taken into account. It is calculated by deducting the company's incremental tax rate from 100% and multiplying the result by the debt's interest rate. The equation is:
Debt service costs before taxes (100 percent - incremental tax rate)
= Debt's after-tax cost
Calculation:
10% * (100% - 40%)
= 6%
Therefore, the after-tax cost of debt for a firm with a pre-tax cost of debt is equal to 10% and a tax rate of 40% is 6%.
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