LBO Debt Stack Explained: Tranches, Leverage & Cov-Lite

Key takeaways

A buyout is financed with a stack of debt tranches sitting on a sliver of equity, and the stack has a strict order: a first-lien revolver and term loans get paid first, then second lien, then unsecured high-yield notes, then subordinated or PIK debt, and only then the sponsor's equity. Seniority and security decide who recovers what when the business breaks — which is the entire reason the structure exists
The term loan B does the heavy lifting. It is an institutional loan bought by CLOs and credit funds, not banks; it amortises at roughly 1% a year and repays in a bullet at maturity; it is priced floating at SOFR or EURIBOR plus a margin of roughly 350–450 basis points, often issued at a small discount to par. Everything below it is priced wider because everything below it recovers less
Leverage is the engine. Total debt on a buyout runs at roughly 5.5x EBITDA in the current market — down from nearer 7x at the 2021 peak — against purchase prices of around 11–12x, which is why the equity cheque has climbed back toward half the capitalisation. The same leverage that multiplies the sponsor's return on the way up magnifies the loss on the way down, and it is fixed: the lenders are owed their coupon whether EBITDA grows or not
The market repriced risk almost entirely toward borrowers. Around 90% of US institutional leveraged loans now ship covenant-lite — no maintenance leverage covenant tested each quarter, only an incurrence covenant tested when the borrower acts. That hands the sponsor room to operate through a downturn without tripping the lenders, and it is why first-lien recoveries in recent defaults have fallen below their historical norm

A Buyout Is Bought With Other People's Money — Roughly Half of It

Every leveraged buyout starts with a sources-and-uses table, and the single most important fact on it is how little of the purchase price the sponsor actually pays. The buyer agrees an enterprise value — say 11 times EBITDA — and then funds it with as much debt as the lenders will advance against the business's cash flow, plugging the rest with equity. The debt is the point. Borrow more and the same exit multiplies a smaller equity base into a larger return.

That debt is not a single loan. It is a stack of tranches, each with its own security, seniority, maturity and price, layered so that the cheapest, safest money sits at the top and the most expensive, riskiest money sits just above the equity. The structure is not financial decoration — it is a queue, and the queue decides who gets repaid when the business cannot repay everyone.

Understanding a buyout's financing means understanding that queue, so start at the top of it.

The Stack Has an Order, and the Order Is the Whole Point

The debt tranches are ranked by two things: where they sit in the security — a first-priority claim on the assets, a second claim, or no security at all — and where they sit in the payment waterfall if the company defaults. The higher the claim, the safer the lender, the lower the coupon they accept. Each step down the stack trades a wider spread for a weaker claim, and the whole structure is a single, continuous trade-off between price and priority.

Tranche	Security / rank	Typical leverage	Indicative pricing	Repayment
Revolver (RCF)	First lien, senior secured	Undrawn at close	SOFR + ~300–375	Revolving; for working capital
Term Loan A	First lien, senior secured	Part of senior	SOFR + ~300–375	Amortises fully; bank-held
Term Loan B	First lien, senior secured	~4.0–4.5x	SOFR + ~350–450, with OID	~1%/yr, bullet at maturity
Second lien	Second-priority security	~0.5–1.5x incremental	SOFR + ~650–850	Bullet
Senior unsecured (high yield)	Unsecured, structurally junior	~1–2x incremental	Fixed coupon, high single to low double digits	Bullet, with non-call period
Subordinated / mezzanine / PIK	Contractually junior	Thin top layer	Low-to-mid teens, part or all PIK	Bullet; interest may accrue
Sponsor equity	Residual claim	The plug	—	Last in line; takes the loss first

The figures move with the cycle — spreads widened materially through 2022–2023 as base rates rose — but the ordering does not. A first-lien term loan is cheap because it is first in the queue with a claim on the collateral; a PIK note is expensive because it is last before the equity and may have no security at all. Read the stack top to bottom and you are reading a list of lenders sorted by how much risk each agreed to take.

The Term Loan B Is the Workhorse: Institutional, Bullet, SOFR + 400

The term loan B is where most of a buyout's debt lives, and it behaves nothing like a corporate bank loan. It is bought not by the banks that arrange it but by institutional investors — collateralised loan obligations (CLOs), which package leveraged loans into rated tranches, plus credit and loan funds. The bank underwrites and syndicates it; the long-term holders are the institutions. That investor base is why the TLB market is deep, liquid, and able to absorb single financings of several billion.

Its mechanics follow from that. A TLB amortises only nominally — roughly 1% of face a year — and repays the balance in a single bullet at a maturity usually around seven years, because institutional holders want yield, not their principal dribbled back early. It is priced floating: a margin over SOFR (or EURIBOR in Europe) of roughly 350–450 basis points for a typical single-B credit, reset every period as the base rate moves. And it is frequently issued at an original issue discount — sold at, say, 99.5 rather than 100 — which lifts the lender's effective yield without touching the headline margin.

OID and the soft call: the two terms that quietly move the yield A loan issued at an OID of 99.5 pays out 99.5 pence per pound of face but must be repaid at 100 — the half-point discount is extra yield the borrower concedes to clear the market, and in a weak market the discount widens. The mirror image is call protection: a TLB typically carries a "101 soft call" for the first six months, meaning the borrower must pay 101 to refinance the loan away in that window. The discount compensates the lender for taking the paper; the soft call compensates them if the borrower repays too soon. Both are yield, neither shows up in the quoted margin, and a candidate who reads only the spread misses part of the price.

The TLB sets the reference point for everything beneath it, because every junior tranche is priced as a spread over the risk the TLB already carries.

Below the TLB: Second Lien, High Yield, and the PIK That Pays in More Debt

Once the first-lien term loans are exhausted, additional leverage gets more expensive fast, because each new tranche sits behind the one above it in the queue. Second-lien debt takes a second-priority claim on the same collateral — it recovers only after the first lien is made whole — and prices a few hundred basis points wider to compensate, often SOFR + 650–850. In recent years private credit funds have absorbed much of this layer, sometimes collapsing the whole structure into a single blended unitranche facility from one lender.

Senior unsecured notes — high-yield bonds — sit lower still: no security at all, a fixed coupon rather than a floating margin, and a bullet maturity protected by a non-call period during which they cannot be redeemed. Below them, subordinated and mezzanine debt is contractually junior to everything, priced into the low-to-mid teens, and frequently structured to pay in kind.

Common mistake Treating PIK interest as cheap because it does not drain cash. A payment-in-kind note pays its coupon by issuing more debt rather than writing a cheque — the balance compounds instead of being serviced. That preserves liquidity in the early years, which is exactly why sponsors reach for it, but the debt grows every period at a low-to-mid-teens rate, and at exit the accreted balance is repaid before the equity sees a penny. PIK does not reduce the cost of leverage; it defers it and lets it compound. A "10% PIK" left to run for five years repays roughly 1.6 times its original face.

The price climbs at every step for one reason — recovery falls at every step — so it helps to put real numbers through the stack.

Worked Sources & Uses: A £1bn Buyout at 5.5x Leverage

Take a business with £100m of EBITDA, bought at an 11.0x multiple. The enterprise value is £1,100m. The sponsor levers it at 5.5x total — £550m of debt — and funds the rest with equity, plus the fees a deal of this size carries.

1. Uses: £1,100m to buy the business, plus ~£40m of fees. Transaction and financing fees — advisory, arrangement, OID, legal — run to several percent of the deal. Total uses ≈ £1,140m. This is the money that has to be raised.

2. First-lien term loan B: £450m at 4.5x. The cheapest, safest tranche carries the most leverage. At SOFR + 400 with the base rate near 4.5%, the all-in cost is roughly 8.5%, or about £38m of cash interest a year.

3. Second lien: £100m at 1.0x. The junior secured layer takes total leverage to 5.5x. At SOFR + 750 it costs around 12%, or ~£12m a year — a third of the TLB's cost for under a quarter of the debt.

4. Equity plug: ~£590m. Sources must equal uses, so the sponsor writes a cheque for £1,140m − £550m = £590m — about 52% of the capitalisation. That is the sliver the entire return is calculated on, and the layer that absorbs the first pound of loss.

The numbers expose the trade the sponsor is making. £550m of debt costs roughly £50m a year in cash interest against £100m of EBITDA — half of operating earnings goes to lenders before the equity earns anything. That is the price of the leverage, and it is fixed regardless of how the business performs.

~52% The equity cheque as a share of total capitalisation in the worked deal — back near historic highs. A decade ago sponsors funded buyouts with closer to 40% equity; higher base rates since 2022 have cut how much debt cash flow can service, forcing more equity into every structure and compressing the returns leverage used to manufacture

Covenant-Lite Won: How the Loan Market Stopped Testing Leverage Every Quarter

For most of leveraged finance's history, a term loan came with a maintenance covenant — a leverage or interest-coverage ratio the borrower had to satisfy every quarter, regardless of whether it had done anything. Breach it and the lenders could accelerate, forcing the company to the table while there was still value to protect. The covenant was the lenders' early-warning system and their seat at the negotiation.

The institutional loan market has now largely abolished it. A covenant-lite loan carries only incurrence covenants — tested not on the calendar but only when the borrower takes an action, such as raising more debt or paying a dividend. Around 90% of US institutional leveraged loans now ship cov-lite. The sole concession to the old regime is the springing covenant: a leverage test on the revolver that applies only if the facility is drawn beyond a threshold, typically around 35–40%, so it protects the revolving lenders and no one else.

Insider tip Cov-lite did not happen because lenders got careless. It happened because demand for floating-rate loan paper — driven by relentless CLO formation — outstripped the supply of new buyouts, and in a market where capital is chasing assets, the borrower writes the terms. Sponsors used that leverage to strip out the maintenance covenant, loosen the EBITDA add-back definitions, and widen the baskets that let them incur more debt later. Naming the supply-demand cause, not just the label, is what tells an interviewer you understand cov-lite as a market outcome rather than a documentation quirk.

Common mistake Assuming cov-lite only helps the borrower. It helps the sponsor enormously — a struggling company can burn through a downturn without tripping a covenant, buying time the old regime never granted. But it removes the lenders' brake, so by the time a cov-lite credit actually defaults it has usually been deteriorating, unchecked, for far longer, with more secured debt layered ahead of any given lender. That is why first-lien recoveries in recent default cohorts have run below the ~70% historical average: the covenant that used to catch problems early is gone, and the loss when problems finally surface is correspondingly larger.

The covenant package decides what happens when leverage goes wrong, but it is the leverage itself that decides why a sponsor takes the risk in the first place.

Why Sponsors Lever Up: The Engine That Magnifies the Return Also Magnifies the Loss

Leverage is not a financing afterthought; it is a primary driver of the return. Buy a business for £1,100m with £590m of equity, grow EBITDA and pay down debt, and sell five years later for £1,400m, and the equity has captured the entire enterprise-value gain plus every pound of debt the cash flow retired — a multiple on the original cheque that the unlevered business could never produce. Debt paydown alone is one of the three legs of the value-creation bridge, and leverage is what makes the other two — earnings growth and multiple expansion — pay out on a small base.

The asymmetry is the catch. The lenders' claim is fixed and senior; the equity's claim is residual. If EBITDA falls instead of growing, the interest bill does not, the equity absorbs the shortfall first, and a buyout that would have been a flesh wound unlevered becomes a wipeout levered. The same multiplier works in both directions, and the sponsor chooses how far to push it knowing the downside lands on its own cheque before anyone else's.

The 2022 Repricing: Floating-Rate Debt Met a 500-Basis-Point Hike

The structure's hidden fragility is that most of the stack floats. When the US Federal Reserve raised rates from near zero to above 5% across 2022 and into 2023, SOFR rose with it, and every term loan repriced automatically. A buyout financed at SOFR + 400 saw its all-in cost roughly double — not because the business changed, but because the base rate underneath its debt did.

That mattered most where it was tightest. A company underwritten at, say, 2x interest coverage on cheap money could see that coverage halve as the floating coupon climbed, draining the cash that was meant to pay down debt and fund growth. Deals struck in the 2021 boom at 7x leverage and rock-bottom spreads were the ones caught, and the squeeze is part of why private credit stepped in: a sponsor in a tight spot would rather renegotiate with one fund holding the whole loan than a syndicate of CLOs it cannot get on the phone.

Interview framing Asked why floating-rate debt is risky for an LBO, do not stop at "rates can rise". Connect it to the model: higher SOFR lifts the cash interest line, which lowers the cash available to amortise debt, which slows deleveraging, which shrinks the equity's share of the exit — and if coverage falls far enough, the springing covenant or a refinancing wall forces the issue. Tracing the rate move all the way through to the equity return is what separates a memorised fact from an understanding of the structure.

How This Is Tested: "Walk Me Through the Debt in an LBO"

The question is a staple of PE and leveraged-finance interviews, and the weak answer lists tranche names. The strong answer explains the logic of the order: first-lien term loans at the top because they hold the security and price cheapest, junior secured and unsecured layers beneath them paying progressively wider spreads for weaker claims, and the sponsor's equity at the bottom taking the first loss. Name the TLB as the workhorse, flag that it floats over SOFR and pays a bullet, and you have shown you know how the paper actually behaves.

The follow-ups probe depth. Why is a TLB cheaper than a second lien? Because it is first in the recovery waterfall. What is cov-lite and who does it favour? The borrower, because there is no quarterly leverage test to trip. What does PIK do to the structure? It compounds the junior debt instead of servicing it. A candidate who can move from the order of the stack to the price of each tranche to the covenants that govern it is describing a capital structure, not reciting a glossary.

The Verdict: The Stack Is a Priced Queue, and the Price Is the Risk

A buyout's debt looks complicated and is, underneath, a single idea: lenders are paid in the order of their claim, and they price their loan for the risk that the claim is worth less than its face when the business breaks. Senior secured money is cheap because it is first and collateralised; PIK money is dear because it is last and often bare. Every tranche in between is a point on that line, and the leverage multiple is just how far down the line the sponsor chose to borrow.

The structural shift of the last decade is that the borrower captured the documentation. Cov-lite stripped the lenders' early brake, looser definitions widened what counts as EBITDA and what debt can be incurred, and the result is a market that finances buyouts generously and polices them lightly — until a rate shock or an earnings miss tests a structure with no covenant to catch it. The stack still works exactly as designed; the question the next cycle answers is what the design costs the lender when it finally fails.

Anyone can name a term loan B and a high-yield bond — that is the glossary. The judgement is knowing why they are priced where they are: that the order of the queue sets the price, that the TLB floats and bullets because institutions buy it for yield, that cov-lite is a market outcome of capital chasing too few deals, and that the same leverage manufacturing the return is a fixed, senior claim that takes the equity out first when it goes wrong. Reading the stack as a priced queue rather than a list of acronyms is the difference between someone who has modelled a buyout and someone who has memorised one.

Careers: An Associate Builds the Debt Schedule and Lives in It

On a live deal the debt stack is not an abstraction the associate reads about — it is a schedule they build and maintain. Every tranche becomes a line in the model: a draw at close, a margin over a forecast SOFR curve, a cash-interest line, an amortisation profile, a PIK accretion if it compounds, and a mandatory cash sweep that pushes surplus cash flow into early repayment. The returns tab the partner cares about is downstream of that schedule getting the order, the pricing, and the paydown right.

The judgement shows in the assumptions. How much leverage will the market bear for this credit, and at what spread? What does coverage look like if the base rate stays higher for longer? How fast does the structure deleverage, and does the cash sweep or the bullet do the work? An associate who treats the debt schedule as plumbing produces a model that ties; one who understands the stack as a priced queue produces a financing the deal team can actually take to lenders. The first keeps the file moving — the second is what the seat is for.

Take Your Preparation Further

The debt stack sits at the centre of the buyout machinery, so read it alongside the pieces that surround it. Start with the LBO model, where the schedule is built, and the value-creation bridge, which shows how debt paydown becomes return. For the lenders on the other side of the table, private credit and direct lending covers the funds that increasingly hold the whole loan, and for the price the leverage is layered onto, the EV-to-Equity Bridge. For the wider context of how buyouts make money, PE strategies, and for the exam itself, the LBO modelling test.

For the valuation methods the entry multiple rests on, download our free Valuation Methods Cheat Sheet, and to build the debt schedule yourself — three tranches, amortisation, interest, and a returns bridge — see the LBO Model Template.

Ready for personalised feedback? Book a 1-on-1 mentoring session with an experienced IB/PE professional.

The LBO Debt Stack Explained: How a Buyout Is Financed From Senior Secured to PIK — and Why Covenant-Lite Took Over the Loan Market