The primary benefit of calculating the after-tax cost of debt is knowing how much a business can save on its taxes due to the interest it paid over the year. This means businesses need to know their effective tax rate to understand their total cost of debt. Calculating the effective tax rate for a business is easy.

How do you calculate cost of capital on financial statements?

The cost of capital is found using the the weighted average cost of capital formula. The weighted average cost of capital (WACC) is the cost of debt times the cost of debt tax break times the weight of debt in the capital structure plus the cost of equity times the weight of equity in the capital structure.

How is the cost of debt calculated after taxes?

Cost of Debt After Taxes. The after-tax cost of debt is the interest paid on debt less any income tax savings due to deductible interest expenses. To calculate the after-tax cost of debt, subtract a company’s effective tax rate from 1, and multiply the difference by its cost of debt.

How is the effective cost of debt determined?

The reduction in income tax due to interest expense is called interest tax shield. Due to this tax benefit of interest, effective cost of debt is lower than the gross cost of debt. After-tax cost of debt can be determined using the following formula:

How is the cost of debt included in cost of capital?

The after-tax cost of debt is included in the calculation of the cost of capital of a business. The other element of the cost of capital is the cost of equity. A business has an outstanding loan with an interest rate of 10%. The firm’s incremental tax rates are 25% for federal taxes and 5% for state taxes, resulting in a total tax rate of 30%.

What is the effective tax rate on debt?

The effective tax rate is the weighted average interest rate of a company’s debt. For example, say a company has a $1 million loan with a 5% interest rate and a $200,000 loan with a 6% rate. The effective interest rate on its debt is 5.2%.