Sensitivity Analysis - WACC

In a WACC sensitivity analysis in my textbook the drivers sensitized for are 'debt-to-total capitalization' and 'pre-tax cost of debt'.

What is the reason for using pre-tax cost of debt rather than just cost of debt? Further, is that just one of several possibilities to sensitize WACC, or are these the drivers commonly used?

 

Interest is a tax-deductible expense, so a company taking on debt (be it a bond or a debenture) creates a tax shield. Tax shields allow companies to reduce income taxes due as allowable deductions (as per the taxation act). This obviously affects cash flows and subsequently, overall value of the entity in question.

Hence the after-tax cost of debt = pre-tax cost of debt * (1 - taxation rate) is used to capture this interest tax shield.

 
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