Interest Expenses: How They Work, Plus Coverage Ratio Explained
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
Interest expense is the cost of borrowed money recognized in an accounting period, covering interest accrued on bonds, loans and credit lines whether or not it has been paid yet.
Key takeaways
- Interest expense sits on the income statement as a non-operating cost, usually after operating income and before tax.
- Interest accrued but not yet paid is recorded as interest payable, a current liability on the balance sheet.
- The interest coverage ratio divides EBIT by interest expense, and a ratio below 3 is often seen as a warning sign.
- US business interest deductions are limited largely to 30% of adjusted taxable income for many larger businesses.
Interest expense is the cost of borrowed money recognized during an accounting period. For a company, it is the interest accrued over the period on bonds, bank loans, convertible debt, lines of credit and other borrowings, whether or not it has been paid in cash yet. Individuals incur interest expense too, most visibly on a mortgage, where total interest over the life of the loan can run to tens of thousands of dollars.
Where Interest Expense Appears in Financial Statements
Income statement. Interest expense is reported on the income statement, typically after operating income and before income tax. It is classed as non-operating because it reflects how the business is financed rather than how it runs day to day. Many companies show a single net interest expense line, which is interest expense minus interest income earned on cash and investments.
Balance sheet. Interest expense itself is not a balance sheet account. Because accrual and payment rarely happen on the same day, the timing gap lands on the balance sheet. Interest accrued but not yet paid is interest payable, a current liability. Interest paid in advance is a prepaid item under current assets.
Cash flow statement. Actual cash paid for interest appears here. Under US GAAP it is classified as an operating cash outflow; IFRS lets companies choose operating or financing classification.
Banks are the main exception to the “non-operating” label. Paying interest on deposits is central to a bank’s business, so its interest expense is an operating cost, and analysts focus on net interest income: interest earned on loans minus interest paid to depositors and other lenders.
How Interest Expenses Work
Calculating Interest Expense
At its simplest, interest expense equals the interest rate times the outstanding principal, scaled to the length of the period:
Interest expense = principal × annual interest rate × (days or months in period ÷ days or months in year)
The amount also depends on the general level of rates. High inflation tends to bring higher interest rates, so companies that borrow or refinance then lock in larger costs (see the U.S. inflation rate by year). Variable-rate debt passes rate changes through almost immediately; fixed-rate debt delays the effect until refinancing.
Recording Interest Expense: Debit or Credit?
Interest expense is an expense account, so it increases with a debit. Hypothetical: A company has a $1,000,000 note at 6% annual interest, paid once a year. At the end of the first quarter, it accrues three months of interest: $1,000,000 × 6% × 3/12 = $15,000.
| Event | Debit | Credit |
|---|---|---|
| Quarter-end accrual | Interest expense $15,000 | Interest payable $15,000 |
| Annual payment (four quarters accrued) | Interest payable $60,000 | Cash $60,000 |
The expense hits profit and loss each quarter; the payable builds on the balance sheet until the cash payment clears it.
Interest Expense vs. Interest Payable
These two terms are often confused. Interest expense is the cost recognized for a period and flows into net income. Interest payable is the unpaid balance owed at a specific date. A company can report large interest expense with zero interest payable if it pays every month, or a growing payable if payments lag the accrual.
The Interest Coverage Ratio
The interest coverage ratio compares operating income, or EBIT (earnings before interest and taxes), with interest expense:
Interest coverage ratio = EBIT ÷ interest expense
A higher ratio means operating profit covers interest obligations more comfortably. Lenders and analysts watch it closely alongside debt-to-equity, especially during downturns, when heavily indebted companies can struggle to service their debt as earnings fall.
Example
Hypothetical: A company carries $100 million of debt at 8%, giving $8 million of annual interest expense. With EBIT of $80 million, coverage is $80 million ÷ $8 million = 10.
If EBIT dropped below $24 million, coverage would fall under 3. A ratio below 3 is often treated as a warning sign that the company could have trouble meeting its obligations, though acceptable levels vary by industry and business stability.
Some analysts substitute EBITDA for EBIT, which adds back depreciation and amortization and produces a higher ratio for the same interest bill.
Tax Treatment
For businesses, interest expense is generally tax-deductible, which lowers the after-tax cost of debt: at a hypothetical 21% tax rate, $1 million of deductible interest costs about $790,000 after tax. In the US, business interest deductions are limited largely to 30% of adjusted taxable income for many larger businesses.
For individuals, the rules depend on the country and the loan’s purpose. US homeowners who itemize can deduct qualifying mortgage interest within set limits; Canada does not allow it on a personal residence. Interest on money borrowed to earn investment income is deductible in many jurisdictions, with restrictions; in Canada, not when the investments sit in a registered account such as an RRSP, RESP or TFSA.
Limitations of Interest Expense as a Measure
- Accrual, not cash. The income statement figure is interest accrued; cash actually paid appears on the cash flow statement.
- Capitalized interest. Interest on funds used to build long-lived assets can be capitalized into the asset’s cost under both US GAAP and IFRS, so it bypasses the interest expense line and is expensed later through depreciation.
- Netting. A net interest expense line can hide a large gross interest bill offset by interest income on cash balances.
- Point in time. One period’s expense says little about upcoming refinancing at different rates.
- EBIT is not cash. A healthy coverage ratio can coexist with weak cash generation, which is why free cash flow is a useful cross-check.
FAQs
Is interest on bonds an income or an expense?
It depends on which side you are on. The issuer that borrowed by selling bonds records interest expense; the investor who holds the bonds records interest income. The same applies to a bank loan: an expense for the borrower, income for the bank.
Does interest expense relate to lenders, shareholders or both?
Lenders. Interest is the return paid to creditors for the use of borrowed money. Payments to shareholders, such as dividends, are distributions of profit and are not recorded as interest expense.
The Bottom Line
Investors, lenders and business owners use interest expense to judge how much a company's financing costs weigh on its profits. The income statement figure reflects accruals rather than cash, and it can be reduced by netting or capitalized interest. Reading it alongside interest payable, the coverage ratio, cash paid for interest and free cash flow gives a more reliable view of whether a borrower can keep servicing its debt.
