Answer: is highly dependent upon a company's tax rate.
Step-by-step explanation:
The after-tax cost of debt is defined as the net cost of debt that is determined by adjusting the gross cost of debt incurred for its tax benefits. The after-tax cost of debt
equals the pre-tax cost of debt which is then multiplied by (1 – tax rate).
The after-tax cost of debt is the cost of debt which is included while calculating the weighted average cost of capital and it has a greater effect on the cost of capital of a firm when there's an increase in the debt-equity ratio.