Interest Coverage and Leverage Ratios in IB and PE Interviews

Leverage and coverage ratios show up in LBO talks, credit interviews, and IB debt discussions. Memorizing formulas is step one. Interviewers care whether you can say what breaks first when EBITDA falls: covenants, interest, or equity returns.

The short answer

"Debt to EBITDA shows turns of leverage. Net debt to EBITDA nets cash. Interest coverage is EBITDA over interest and speaks to near-term serviceability. In an LBO I watch how those move as we pay down debt and as EBITDA grows, and I stress a downside where coverage tightens first."

Core formulas

Debt / EBITDA = Total Debt ÷ EBITDA
Net Debt / EBITDA = (Debt − Cash) ÷ EBITDA

Interest Coverage = EBITDA ÷ Interest Expense
(or EBIT ÷ Interest, if asked)
Fixed Charge Coverage ≈ EBITDA ÷ (Interest + Mandatory Debt Amort + other fixed charges)
(definitions vary by credit agreement; say so)

Say which EBITDA you are using: LTM, NTM, or covenant EBITDA with addbacks. Mixing those casually is a common miss.

What each one answers

In REPE you will hear DSCR (NOI or CFADS ÷ debt service) more than corporate interest coverage. Same idea: cushion before cash debt service.

Worked snapshot

EBITDA                     100
Interest                    25
Total debt                 450
Cash                        50

• Debt / EBITDA = 4.5x
• Net Debt / EBITDA = 4.0x
• Interest coverage = 4.0x

How to talk about "high" leverage

There is no universal bad number. Context:

• Industry cyclicality and FCF conversion
• Senior vs total leverage
• Rate environment: floating vs fixed
• Covenant package: maintenance vs incurrence

Also name the debt stack. Senior leverage of 3.5x with total leverage of 5.5x tells a different story than all-senior 5.5x. Mezz, HoldCo notes, and preferred can sit under OpCo debt and change who gets hurt first.

LBO angle

Entry leverage sets equity check size and interest burden. In the debt schedule, coverage can tighten in early years if EBITDA dips or rates reset. When you walk an LBO, offer a quick coverage check in Year 1 and at exit, not only MoIC.

Sponsors love de-levering via EBITDA growth and mandatory or excess cash sweep. Your narrative should include both: "We enter at 5.5x, pay down to about 3.5x by exit if the plan hits, and coverage widens as interest falls with the balance."

Downside stress (verbal)

"If EBITDA drops 20% to 80: Debt / EBITDA rises to about 5.6x and interest coverage falls to 3.2x, all else equal. I would check covenants and whether revolver capacity still exists."

That sentence shows you can shock the ratio without a full model. Add one more beat if they push: "If interest is floating and rates are up, coverage can tighten even before EBITDA falls."

Related metrics interviewers mix in

• Loan-to-value (LTV) in real estate and asset-backed deals
• Debt / (EBITDA − CapEx) style maintenance leverage for capex-heavy names
• Senior leverage vs total leverage when mezz or HoldCo notes sit under OpCo debt
• Fixed charge coverage when amort and rent-like fixed obligations matter

Common mistakes

1. Mixing EBIT and EBITDA casually in coverage
2. Using NTM EBITDA in the denominator with LTM debt without saying so
3. Ignoring cash when the question asked for net leverage
4. Treating covenant definitions as identical to textbook EBITDA
5. Quoting a leverage number with no industry or FCF context

30-second verbal

"Debt to EBITDA shows turns of leverage. Net debt to EBITDA nets cash. Interest coverage is EBITDA over interest and speaks to serviceability. In an LBO I watch how those move as we pay down debt and as EBITDA grows, and I stress a downside case where coverage tightens first."

Practice

On Project Apollo, compute Year-1 net leverage and interest coverage, then shock EBITDA −15% and restate both out loud. Pair with debt schedules and cash sweeps and covenant-lite.