Leveraged Buyout Debt Structure Explained

A leveraged buyout is financed through multiple layers of debt, each with different seniority, interest rates, and repayment terms. The typical structure stacks senior secured debt (loans and bonds), mezzanine debt (subordinated instruments), and equity in a waterfall that reflects claim priority in default.

Why layer debt?

A leveraged buyout is built on the premise that debt is cheaper than equity. A bank loan costs 5–6%; mezzanine debt 9–11%; equity requires 15%+ returns. By borrowing at lower rates and using equity sparingly, the sponsor amplifies return on equity if the business performs.

But debt layers serve another purpose: they align risk. Senior lenders demand strong covenants and first claim on cash. Mezzanine investors accept greater risk but receive higher rates and upside participation through warrants. Equity sponsors bear the worst case but keep the full upside. Each layer is calibrated to its risk appetite.

Senior secured debt

Senior debt is the foundation of LBO financing. It typically comprises two tranches:

Revolving credit facility (revolver) — A $20–100M line of credit used for working capital, acquisitions, or temporary shortfalls. The company pays an annual fee (0.5–1% of the commitment) even if undrawn, and interest only when drawn. The revolver is senior-most: it is repaid first in any restructuring.

Term loan B (TLB) — The bulk of senior debt. A $100–500M term loan at LIBOR + 3–5% (or SOFR + 3–5% post-2021), maturing in 4–6 years. The company makes quarterly interest payments and occasional amortization (1–2% annually). The TLB is also secured by collateral: the company’s assets, cash conversion cycle, and future free cash flow.

Senior lenders impose tight covenants:

• Leverage ratio: Total debt ÷ EBITDA may not exceed 4.5–5.5x (varies by industry and cycle).
• Interest coverage: EBITDA ÷ interest expense must exceed 2.0–2.5x (the company can service its debt).
• Minimum cash balance: Often $10–50M, protecting liquidity.
• Restrictions on additional debt, dividends, and asset sales: Lenders want cash preserved for debt repayment.

If the company breaches a covenant, the lender can accelerate repayment and seize collateral—a catastrophic event. Thus, covenant compliance is paramount.

Mezzanine debt and subordinated instruments

Mezzanine (or sub-debt) sits below senior loans in the capital structure. It is subordinated: if the company defaults, mezzanine investors are paid after senior lenders have been repaid in full. This greater risk commands higher rates: 9–12%, sometimes higher in difficult vintage years.

Mezzanine characteristics:

• Higher coupon: Compensates for delayed repayment and subordination.
• Longer maturity: Often 7–10 years, extending beyond senior debt.
• Warrants or equity kickers: Mezzanine investors receive a small equity stake (e.g., 2–5% of the company) at purchase or via warrants exercisable later. This gives them upside participation if the company is sold successfully.
• Fewer covenants: Senior lenders already police the company, so mezzanine terms are lighter (e.g., looser leverage or interest-coverage ratios).
• PIK toggle: Some mezzanine instruments allow the company to elect payment-in-kind (PIK) in certain years, deferring cash interest and accruing it instead. This preserves cash during weak years but increases total debt owed.

A typical LBO might structure debt as follows:

• Senior revolver: $50M
• Senior term loan: $300M at SOFR + 4%
• Mezzanine debt: $100M at 10% (with 3% PIK toggle)
• Equity: $150M

Equity cushion and sponsor skin-in-the-game

The sponsor (the private equity firm) commits equity—typically 25–40% of the purchase price. This is called the “equity cushion.” Its role is threefold:

1. Absorbs the first losses: If the company underperforms and asset values decline, equity holders lose first. Senior and mezzanine investors are protected until equity is wiped out.
2. Provides incentive alignment: The sponsor has significant capital at risk, so it is motivated to manage the company well rather than milk cash and leave debt holders with a hollowed-out shell.
3. Provides debt capacity: Lenders feel secure when the sponsor has “skin in the game.” A sponsor with only 15% equity would raise alarm.

A lower equity cushion (20%) allows higher leverage and potentially greater returns if the deal succeeds—but increases risk of covenant breach or forced asset sales during downturns.

The repayment waterfall

In default or liquidation, the waterfall determines who is paid:

1. Costs of bankruptcy/restructuring (lawyers, advisors).
2. Senior secured debt (revolver and term loans) — paid in full before anyone else.
3. Mezzanine debt — paid only after senior is satisfied.
4. Equity sponsors — receive whatever remains (usually nothing in a default scenario).

This structure means mezzanine investors routinely take losses in distressed LBOs. Sponsors, as equity holders, often lose their entire investment. Senior lenders, however, usually recover principal and interest through collateral liquidation.

Refinancing and covenant management

As the LBO matures, refinancing becomes critical. Original senior term loans mature in 4–6 years. If the company’s business has improved—EBITDA growth, stronger cash flow—the sponsor can refinance at better terms, extract cash distributions to equity holders, or pay down debt.

But if performance deteriorates, refinancing is jeopardy. A company that was 4.0x levered at close might be 5.5x levered by year 3 due to EBITDA decline. At maturity, lenders are unwilling to refinance at par; they demand higher spreads or equity haircuts.

Covenant flexibility matters enormously. Some LBO agreements build in “step downs” (leverage ratios tighten over time as debt is repaid), while others allow covenant resets if EBITDA grows. These give sponsors room to breathe during cyclical downturns.

Pricing and market conditions

LBO debt pricing depends on the target’s credit rating, leverage ratio, and broader credit conditions.

In “sponsor-friendly” markets (low rates, strong lending appetite), senior TLBs price at SOFR + 2.5–3.5%, and mezzanine at 8–10%. In stressed markets, senior spreads widen to SOFR + 5–6%, and mezzanine hits 12–15% (or becomes unavailable).

The median LBO in 2015–2020 carried 5.5–6.0x leverage (senior + mezzanine debt ÷ EBITDA). By 2023, tighter credit conditions brought median leverage down to 4.5–5.0x as sponsors reduced debt levels to match lender appetite.

Default and restructuring outcomes

When an LBO company breaches covenants or misses interest payments, negotiation typically ensues. Senior lenders may amend covenants (raising leverage caps), extend maturity, or accept a modest principal reduction. Mezzanine and equity are asked to provide additional capital (a “mezzanine raise”) or accept haircuts.

If negotiation fails, the company enters bankruptcy. Senior debt is repaid through asset sales or a plan of reorganization. Mezzanine holders rarely recover par; equity is wiped out.

Historically, senior debt recovers 75–85% of principal in LBO defaults; mezzanine recovers 30–50%; equity recovers nearly nothing.

See also