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In this article, you’ll find out how to calculate your debt financing, including interest rates. Next, it’s important to understand that there are multiple ways to https://www.apzomedia.com/bookkeeping-startups-perfect-way-boost-financial-planning/ calculate cost of debt. Two of the most common approaches to the cost of debt formula are to calculate the after-tax cost of debt and the pre-tax cost of debt.

The cost of debt is the effective interest rate the company pays on its current liabilities to the creditor and debt holders. The difference between the before-tax cost of debt and the after-tax cost of debt depends bookkeeping for startups on the fact that interest expenses are deductible. It is an integral part of WACC, i.e., weight average cost of capital. The company’s capital cost is the sum of the Cost of debt plus the Cost of equity.

## Debt Compared to Equity

In the calculation of the weighted average cost of capital (WACC), the formula uses the “after-tax” cost of debt. The effective interest rate is the weighted average interest rate we just calculated. The income tax paid by a business will be lower because the interest component of debt will be deducted from taxable income, whereas the dividends received by equity holders are not tax-deductible. But often, you can realize tax savings if you have deductible interest expenses on your loans.

These include a longer payback period, since the longer a loan is outstanding, the greater the effects of the time value of money and opportunity costs. The riskier the borrower is, the greater the cost of debt since there is a higher chance that the debt will default and the lender will not be repaid in full or in part. Backing a loan with collateral lowers the cost of debt, while unsecured debts will have higher costs.

## Relevance and Uses of Cost of Debt Formula

Using our WACC formula, we can start calculating each side of the equation — the equity side and the debt side. This will give you an idea of how long you’ll need to pay off your debts and how much interest you’ll accrue over time. You should be able to get this information from your business accountant.

### How do you calculate cost of debt for debentures?

To find your total interest, multiply each loan by its interest rate, then add those numbers together. To calculate your total debt, add up all your loans. Then, divide total interest by total debt to get your cost of debt.

You will also learn how to use Microsoft Excel or Google Sheets to calculate the cost of debt and how a tool like Layer can help you synchronize your data and automate calculations. For certain types of debt, we may not have the market prices readily available, for example, bank loan. In such cases, the cost of debt can be based on company’s rating by comparing it with the bonds with similar characteristics. YTM represents the most reliable estimate of a firm’s cost of debt as long as the firm’s debt is investment grade. Investment grade bonds are those whose credit quality is considered to be among the most secure by independent bond rating agencies. A rating of BBB or higher by Standard & Poor’s and Baa or higher by Moody’s Investors Service is considered to be investment grade.