DSCR vs interest coverage ratio: what each measures

The debt service coverage ratio and interest coverage ratio differ mainly in the obligations they test: DSCR includes scheduled principal and interest, while interest coverage tests interest alone. Their numerators can differ too, so a comparison needs the earnings definition as well as the debt schedule.

What each ratio measures

DSCR = Defined earnings or cash available for debt service / Scheduled debt service

Interest coverage ratio = EBIT / Interest expense, under the convention used here.

Scheduled debt service means the principal and interest required in the stated period, with any additional agreement-specific items identified separately. It is not the entire outstanding debt balance. The Federal Reserve's commercial-loan definition in section 244.14 uses EBITDA divided by annual principal and interest payments for commercial loans, and a different numerator for qualifying commercial real estate loans. That demonstrates why the numerator needs a label.

The Federal Reserve's research definition of interest coverage uses EBIT over interest expense. These are useful analytical conventions, rather than a substitute for the definitions in a particular financing agreement.

The separate DSCR formula guide owns the metric itself, while the interest coverage ratio guide develops EBIT reconciliation and interest definitions. This comparison focuses on what changes when the same business is tested both ways.

Build one consistent set of inputs

Use a closed annual P&L, the debt schedule covering that same year, and interest-account detail. Keep entity and currency consistent. A consolidated earnings figure paired with only one subsidiary's debt schedule understates the obligations being tested.

For each debt facility, retain the lender or facility identifier, payment dates, principal due, interest due, and any separately identified charges. Use the contractual payment schedule for an assessment of scheduled service. If you are examining payment performance, compare actual payments against it rather than quietly replacing due amounts with amounts paid.

Keep numerator adjustments on a separate list with account references and reasons. EBITDA is not simply whatever expenses management would prefer to exclude. The SEC's guidance on EBIT and EBITDA, question 103.01, distinguishes those measures from differently adjusted measures that need distinct labels.

The same company worked both ways

Cedar Supply is a fictional US industrial distributor. Its annual input table below is in USD. For this illustration, interest expense equals scheduled cash interest, and there are no other financing charges or numerator adjustments. That explicit equality keeps the example focused on principal and depreciation.

The debt schedule contains these two facilities for the same year:

Now divide the appropriate numerator by each denominator:

The business has earnings before interest and tax equal to three times interest expense. Its stated EBITDA is only one and a half times the full scheduled service. Neither multiple is wrong: each answers its own question. Ratios throughout this example use unrounded inputs and are displayed to two decimal places.

Separate the denominator effect from the numerator effect

The difference between 3.00x and 1.50x has two causes. First, DSCR adds $800,000 of principal to the denominator. Second, its chosen numerator adds back $600,000 of depreciation and amortization. Show both effects instead of attributing the entire difference to principal.

Across either row, adding principal reduces coverage because the denominator grows. Down either column, adding depreciation increases coverage because the numerator grows. This table gives reviewers a common basis when one report says interest coverage and another uses a different earnings convention.

For a pure obligation comparison, hold the numerator fixed. For the report's official calculation, use its documented definition. A business should not switch from EBIT to EBITDA simply to restore an earlier multiple after repayments increase.

Change principal and watch the result

Suppose the next planning case changes only scheduled principal, with earnings and interest unchanged. This is an analytical scenario, not an assumption that a lender will change repayment terms.

The extra $600,000 of principal uses all of the base case's $600,000 excess of EBITDA over scheduled service. Interest coverage never moves because neither of its inputs changed. The planning response is to review the repayment schedule and actual cash availability, rather than interpreting stable interest coverage as unchanged repayment capacity.

Reconcile before using the comparison

The principal rows must total the schedule's required annual repayments. Interest rows must total the schedule's interest, with any difference from P&L expense explained. The two total-service rows sum to $1,200,000, equal to principal of $800,000 plus interest of $400,000.

On the earnings side, subtract interest and tax from EBIT to return to net income: $1,200,000 - $400,000 - $200,000 = $600,000. Subtract depreciation and amortization from EBITDA to return to EBIT. These ties make the two ratio calculations reproducible from their source rows.

For longer maturities, the maximum annual debt service coverage ratio examines the largest annual scheduled burden. The cash debt coverage ratio instead compares operating cash flow with a balance-sheet obligation measure; it should not be substituted for annual DSCR.

Where it goes wrong

• Assuming the numerators match. Read the definition before comparing two reported multiples.
• Using debt balances as annual service. Outstanding principal and principal due this year answer different questions.
• Counting interest twice. A numerator already reduced by interest needs a documented treatment before comparison with a denominator that includes it.
• Missing maturity payments. A schedule limited to regular installments can omit a required final repayment.
• Calling EBITDA cash available. Working capital, tax payments, and capital spending can reduce actual cash even when the earnings numerator is positive.

Compare both ratios on your own file in Covirage

Bring a sample of your own earnings export, documented numerator adjustments, and debt repayment schedule as a file or Google Sheet. Covirage maps the columns, and its tools compute and check both ratios from the supplied definitions; the external AI model explains the differences with every figure traced to its rows. Create a free Covirage account to set up your business and bring the inputs; account creation takes about a minute.

See FP&A reporting with Covirage for the supporting finance workflow.