Unitranche Debt and Lien Priority Explained

Traditional leveraged buyout financing used to involve carefully layered tranches — a senior secured term loan, a second lien facility, and often a mezzanine tranche beneath it — each with its own lenders, its own pricing, and its own seat at the table if things went wrong. Unitranche debt collapses that structure into a single facility, and understanding both unitranche and the lien priority concepts it's built around is essential to understanding how modern private credit deals are actually put together.

What Is Unitranche Debt?

A unitranche facility combines what would traditionally be separate senior and subordinated debt tranches into a single loan, with a single blended interest rate and a single set of documentation and covenants, provided by one lender or a small club of lenders (typically direct lending or private credit funds rather than banks). From the borrower's perspective, this is attractive largely for its simplicity: one lending relationship, one credit agreement to negotiate, and one covenant package to comply with, rather than coordinating across multiple tranches with potentially competing interests.

Behind the scenes, unitranche lenders often use an "agreement among lenders" (AAL) to internally allocate the risk and return of the facility between a notional "first-out" portion (economically similar to senior debt) and a "last-out" portion (economically similar to subordinated or mezzanine debt), splitting payment priority and the blended interest rate between participating lenders even though the borrower sees and deals with only a single facility.

Why Unitranche Has Grown So Fast

Unitranche lending has become one of the defining products of the direct lending and private credit boom of the past decade, particularly in the mid-market where it has displaced a meaningful share of what used to be a syndicated bank loan plus mezzanine structure. Private credit funds can move faster and with more certainty of execution than a syndicated bank process, since a direct lender commits its own capital rather than needing to sell down a loan to other banks, which matters enormously to private equity sponsors competing for deals in a tight auction process where speed and certainty of funding can be a genuine differentiator.

Lien Priority: First Lien vs Second Lien

Separately from unitranche structures, more traditionally layered deals use lien priority to establish which lenders get paid first from collateral if a borrower defaults. A first lien lender holds the senior-most secured claim on the company's assets, getting repaid before any other secured creditor in a default or insolvency scenario, and as a result typically receives the lowest interest rate among a company's secured lenders given its stronger position. A second lien lender holds a secured claim that ranks behind the first lien lender's claim on the same collateral pool — still ahead of unsecured and subordinated creditors, but subordinate to the first lien holder — and is compensated for that weaker position with a meaningfully higher interest rate.

An intercreditor agreement governs the relationship between first and second lien lenders, setting out standstill periods (how long second lien lenders must wait before taking enforcement action), payment subordination terms, and how proceeds from any collateral enforcement are split between the two classes, similar in function to the AAL used within a unitranche structure but governing two genuinely separate facilities rather than internal tranches of one.

How These Structures Compare

A unitranche facility is best understood as collapsing the economics of a first lien/second lien (or senior/mezzanine) structure into a single borrower-facing loan, with the lien priority and payment waterfall concepts still very much present — just allocated internally between lenders through an AAL rather than negotiated directly between the borrower and multiple separate creditor groups. Leveraged loans arranged through a traditional syndicated bank process, by contrast, typically still use explicit first lien and second lien tranches when a deal's capital structure calls for more than one layer of secured debt.

FAQ

Does a borrower know how a unitranche facility is split internally between lenders?
Not necessarily in detail — the agreement among lenders governing the first-out/last-out split is typically a separate arrangement between the participating lenders that the borrower isn't party to, though sophisticated borrowers are usually aware the facility is structured this way.

Why would a second lien lender accept a subordinate position?
In exchange for a meaningfully higher interest rate than a first lien lender receives, compensating for the increased risk of recovering less (or nothing) in a default scenario after the first lien claim is satisfied.

Is unitranche debt more expensive than a traditional multi-tranche structure?
The blended unitranche rate often sits between what a pure first lien rate and a pure second lien or mezzanine rate would cost separately, though the speed and simplicity benefits can outweigh the pricing difference for many borrowers.

Leveraged finance structures and private credit are core topics across Learnsignal's CPD course content for finance professionals.