Why a High Interest Coverage Ratio Can Still Hide a Cash Shortfall
Understand the meaning and limits of operating profit divided by interest expense. Work through a hypothetical calculation that also considers capitalized interest, floating rates, and principal maturities.
The interest coverage ratio usually divides operating profit by interest expense to show how well earnings cover the interest burden. Some definitions use a different numerator, such as EBIT, so state the basis. The measure does not guarantee cash collection or the ability to repay principal.
Keep the numerator and denominator definitions consistent
The operating profit basis common in Korean company analysis may differ from the EBIT basis in overseas materials because of the inclusion of other income and expenses. Also check whether the denominator is gross interest expense or net finance costs after deducting interest income. Using net finance costs for a company with substantial cash-like assets can make the interest burden on its debt appear small. When the denominator is close to zero or negative, conventional multiple-based interpretation becomes difficult. Because interest is directly connected to the core business of financial institutions, avoid applying a manufacturing-company formula unchanged to their credit assessment.
Connect accounting profit with the cash payment schedule
Even sufficient operating profit may coexist with a cash shortage because receivables are collected slowly or inventory is expanding. Conversely, a company with substantial noncash depreciation and amortization may have relatively strong near-term cash inflows despite a low earnings-based coverage ratio. Review cash interest payments, operating cash flow, and essential investment spending together. Borrowing costs included in assets under construction and similar items can make income statement interest expense differ from the total financing burden, so check the relevant notes. Even substituting EBITDA can overstate repayment capacity if cash needed to maintain equipment is ignored.
Calculate rate increases and debt maturities separately
Higher rates on floating-rate debt can lower coverage even if earnings remain unchanged. For fixed-rate debt, the timing of refinancing at a new rate after maturity also matters. Read debt currencies, hedges, and maturity distribution, and examine a scenario combining lower operating profit with higher interest rates. Keep a separate maturity schedule: a company may be able to pay interest but lack the cash to repay a large principal amount in the same year. Rather than setting a safe multiple for every industry, interpret business volatility and liquidity arrangements together. If borrowing balances change during the period, closing principal multiplied by the annual rate will differ from actual interest expense. Matching quarterly average balances with the periods during which rates apply helps explain the difference.
Worked example
Hypothetical example: Operating profit of KRW 12 billion and interest expense of KRW 3 billion give interest coverage of 4 times. If operating profit falls to KRW 9 billion and interest expense rises to KRW 4.5 billion, coverage becomes 2 times. This connects to the simple assumption that a 1.5 percentage point rate increase on KRW 100 billion of floating-rate principal raises the annual burden by KRW 1.5 billion. The conditions are constant principal throughout the year and no hedging or capitalization effects. Principal repayments are outside the ratio calculation.
What to check
- Have you stated whether the numerator is operating profit or EBIT?
- Have you distinguished gross interest expense from net finance costs?
- Have you checked capitalized interest and actual cash payments?
- Have you calculated rate changes and principal maturities separately?
Sources and primary materials
This is educational material about research methods. For an actual company decision, verify the filings and primary sources for the relevant period.