Key Points
- A ratio below 1.5 typically signals elevated going concern risk because the entity barely generates enough profit to service its debt.
- Lenders commonly set covenant thresholds between 2.0 and 4.0, depending on the borrower's industry and risk profile.
- The ratio is calculated as operating profit (or EBIT) divided by interest expense for the period.
- A declining trend over consecutive periods matters more than any single-period figure when assessing financial health.
What is Interest Coverage Ratio?
ISA 520.5 requires the auditor to design and perform analytical procedures as risk assessment procedures. The interest coverage ratio is one of the most direct tests of an entity's ability to meet its financing obligations. You take operating profit (before interest and tax) and divide it by total interest expense. A result of 3.0 means the entity earns three times what it needs to cover its interest payments.
The ratio feeds directly into the going concern evaluation. ISA 570.10 requires the auditor to consider whether events or conditions exist that cast significant doubt on the entity's ability to continue as a going concern. An interest coverage ratio that falls below a debt covenant threshold does not automatically mean going concern doubt, but it forces a specific line of inquiry: has the lender waived the breach, does management have a credible plan to restore the ratio, is refinancing available on acceptable terms, and what does the forward-looking cash flow projection show?
Where it gets overlooked is in the denominator. Interest expense under IFRS 16 now includes the finance charge on lease liabilities. Teams that calculate the ratio using only bank interest understate total obligations and overstate the coverage figure. ISA 520.A5 reminds the auditor to consider whether the data underlying the analytical procedure is reliable and whether the expectation is precise enough to detect a material misstatement.
Worked example: Fernandez Distribucion S.L.
Client: Spanish wholesale distribution company, FY2025, revenue EUR 34M, IFRS reporter. Fernandez carries EUR 12M in bank debt (average interest rate 5.2%) and lease liabilities of EUR 3.4M generating annual finance charges of EUR 170,000. The bank facility includes a covenant requiring an interest coverage ratio of at least 2.5.
Step 1 — Determine operating profit
Fernandez reports EBIT of EUR 2.1M per the audited statement of profit or loss. Confirm that EBIT excludes interest income (EUR 18,000 from a short-term deposit) and is stated before finance costs.
Step 2 — Determine total interest expense
Bank interest is EUR 624,000 (EUR 12M at 5.2%). Lease finance charges are EUR 170,000 under IFRS 16. Total interest expense is EUR 794,000. The covenant definition in the loan agreement specifies "all finance costs recognised in profit or loss," which captures both components.
Step 3 — Calculate the ratio
Interest coverage ratio = EUR 2.1M / EUR 794,000 = 2.64. The ratio exceeds the covenant threshold of 2.5 by a margin of 0.14.
Step 4 — Assess going concern implications
The ratio is above the covenant floor, but the margin is thin. Management's FY2026 budget projects EBIT of EUR 2.4M with stable finance costs, which would increase the ratio to 3.02. The auditor should evaluate whether the forecast assumptions (revenue growth of 4%, stable gross margins) are consistent with the FY2025 trend and with the entity's order book.
Conclusion: the FY2025 interest coverage ratio of 2.64 is defensible and the covenant is not breached, but the limited headroom requires the auditor to document the sensitivity analysis and the basis for concluding that no material uncertainty exists.
Why it matters in practice
Teams frequently calculate the interest coverage ratio using only bank interest, omitting IFRS 16 lease finance charges from the denominator. When the debt covenant references "all finance costs in profit or loss," this exclusion overstates the ratio. ISA 520.A5 requires the auditor to evaluate whether the data underlying the analytical procedure is sufficiently reliable and complete.
The ratio is often calculated at year-end only, without consideration of interim covenant testing dates. Many loan agreements require quarterly compliance. A year-end ratio of 2.8 can mask a Q2 ratio of 1.9 that triggered (or nearly triggered) a waiver request. ISA 570.11 requires the auditor to consider events throughout the period, not only at the reporting date.
Interest coverage ratio vs. debt service coverage ratio
| Dimension | Interest coverage ratio | Debt service coverage ratio (DSCR) |
|---|---|---|
| Numerator | EBIT (operating profit before interest and tax) | Net operating income or EBITDA (varies by lender definition) |
| Denominator | Interest expense only | Total debt service: interest plus scheduled principal repayments |
| What it measures | Ability to cover interest obligations from operating earnings | Ability to cover all debt payments, including principal amortisation |
| Common covenant range | 2.0 to 4.0 | 1.2 to 1.5 |
| When it falls short | Signals the entity may struggle to pay interest; does not capture principal repayment pressure | Signals the entity may struggle to meet all debt obligations; more conservative measure |
The interest coverage ratio tells you whether the entity can pay what it owes on the cost of borrowing. The DSCR tells you whether it can pay back the borrowing itself. On engagements with significant amortising debt, the interest coverage ratio alone may give false comfort. A ratio of 3.0 looks healthy until you add EUR 2M in annual principal repayments to the denominator and watch the DSCR drop below 1.0.
Related terms
Frequently asked questions
What is a good interest coverage ratio?
There is no universal answer. Lenders typically set covenant thresholds between 2.0 and 4.0, depending on industry risk. Capital-intensive industries (manufacturing, infrastructure) often accept lower thresholds because asset backing provides collateral protection. Service businesses with volatile cash flows face higher thresholds. ISA 520.A13 notes that the auditor's expectation should be tailored to the entity's circumstances and industry norms.
Does the interest coverage ratio include lease finance charges under IFRS 16?
Yes, if the denominator is defined as total finance costs in profit or loss. IFRS 16 requires lessees to recognise a finance charge on lease liabilities, which appears within finance costs. Whether the entity's debt covenant captures this charge depends on the covenant definition. The auditor should read the facility agreement to determine whether "interest expense" includes or excludes lease liability finance charges under ISA 570.16(b).
How does a covenant breach affect the going concern assessment?
A breach (or projected breach) of an interest coverage covenant does not automatically create a material uncertainty. ISA 570.16 requires the auditor to evaluate management's plans, including whether the lender has granted a waiver and whether refinancing is available on acceptable terms. An actual breach with no waiver and no credible plan is a strong indicator of material uncertainty under ISA 570.A3.