Mezzanine Financing: How It Works And Key Legal Terms

If your business is growing fast, you’ll eventually hit a familiar funding problem: you need more capital than a normal bank loan will comfortably provide, but you’re not ready (or willing) to give away a big chunk of equity.

That’s where mezzanine financing often comes in.

Mezzanine finance can be a powerful tool for UK businesses that are scaling, acquiring another company, buying out a shareholder, or funding a big expansion. But it’s also a type of funding where the legal terms really matter, because it typically sits between senior debt (like bank lending) and equity (like selling shares).

Below, we’ll break down what mezzanine financing is, how it works in the UK, and the key legal terms you’ll want to understand before you sign anything. This guide is general information only, and isn’t legal, financial, tax or accounting advice.

What Is Mezzanine Financing (And Why Do Growing Businesses Use It)?

Mezzanine financing is a funding structure that sits “in the middle” of a company’s capital stack:

• Above equity (shareholders) – meaning it has priority over shareholders if things go wrong.
• Below senior debt (banks and secured lenders) – meaning it’s usually repaid after senior lenders.

In practical terms, mezzanine finance is often described as a “hybrid” of debt and equity, because it can include:

• a loan (which may be unsecured or have second-ranking security, depending on the deal); and
• a return “sweetener”, such as an option to convert into equity, warrants, or other equity-linked rights.

From a small business perspective, mezzanine financing is typically used when:

• you have strong revenues and cashflow, but your business still looks “too risky” or “too early-stage” for a large senior loan;
• you want to keep control (and avoid a large equity raise); or
• you’re funding a big step-change, like acquiring a competitor, opening a new site, or expanding internationally.

Why it’s attractive: mezzanine funding can unlock growth when you’re stuck between “not enough bank funding” and “don’t want to dilute ownership too much”.

Why you need to be careful: it’s often more expensive than senior debt, and the legal documents can be heavily negotiated (including strict controls over how you run the business).

How Does Mezzanine Financing Work In The UK?

There’s no single “standard” mezzanine structure in the UK, but most deals share the same moving parts: repayment, priority, and upside for the lender.

Where It Sits In The Capital Stack

In a typical funding stack, you might have:

• Senior debt – usually secured, first-ranking, with the lowest interest rate.
• Mezzanine debt – second-ranking or unsecured, higher interest, often with equity upside.
• Equity – founders/shareholders, highest risk, highest upside.

This ranking matters because if the business can’t pay everyone back, senior lenders get paid first. Mezzanine lenders often accept that risk, but they expect a higher return in exchange.

How The Lender Gets Paid (Interest + Fees + Equity Upside)

Mezzanine returns often include a combination of:

• Cash interest (paid monthly/quarterly);
• PIK interest (“payment-in-kind”, rolled up and paid later);
• Arrangement fees and sometimes exit fees; and
• Equity upside (for example, warrants or conversion rights that benefit if your valuation increases).

This is why mezzanine finance can look cheaper than equity at first glance (because you don’t immediately give up shares), but you still need to model the total cost carefully (with appropriate financial advice).

Common Use Cases For Mezzanine Finance

Mezzanine financing is often used for:

• Acquisitions (including bolt-on acquisitions where you need to move quickly)
• Management buyouts (MBOs) or shareholder buyouts
• Growth capex (new premises, equipment, new product lines)
• Refinancing (restructuring existing debt and extending runway)

In many of these scenarios, you’ll see mezzanine used alongside other funding (bank finance, invoice finance, and/or an equity injection).

Is Mezzanine Financing Right For Your Business?

Mezzanine financing can be a strong fit, but it’s not “one-size-fits-all”. The right answer depends on your growth plans, cashflow reliability, and how much control you’re prepared to trade for funding.

When It Can Make Sense

Mezzanine finance is often worth exploring if:

• your business has predictable cashflow and you can service interest (even if part is PIK);
• you’re at an inflection point (new sites, acquisition, expansion) and the returns justify the cost of capital;
• you want to reduce dilution compared with a straight equity round; and
• you’re comfortable with tighter investor-style controls than you’d see in some standard bank loan facilities.

When You Should Be Cautious

You’ll want to slow down and get advice if:

• your cashflow is seasonal or uncertain (tight covenants can become a real headache);
• you’re already highly leveraged; or
• your shareholder group isn’t aligned (mezzanine terms can create friction if a future conversion or warrant exercise is on the table).

If your shareholders aren’t already on the same page about dilution, control, and exits, it’s usually a good time to tighten your internal rules with a Shareholders Agreement before bringing in another sophisticated funding counterparty.

Mezzanine vs Equity (A Simple Way To Think About It)

If you raise equity, you typically:

• give up ownership now;
• usually don’t have mandatory repayments; and
• take on a co-owner with voting rights and governance controls.

If you raise mezzanine finance, you typically:

• keep ownership (at least initially);
• take on repayment obligations; and
• may still give away some future upside (through warrants/conversion features).

Neither option is automatically “better” - but the legal terms and commercial realities are very different.

Key Legal Terms In Mezzanine Financing (What To Watch Out For)

The documents for mezzanine financing can be detailed, and it’s easy to focus on the headline interest rate while missing the terms that really shape risk.

Here are the key legal terms UK businesses should understand before signing.

1) Subordination And Intercreditor Arrangements

Subordination is what makes mezzanine “mezzanine”. It means the mezzanine lender agrees they get paid after the senior lender.

This is often documented in an intercreditor agreement between:

• the senior lender,
• the mezzanine lender, and
• sometimes the company and/or key shareholders.

Intercreditor terms can control things like:

• when the mezzanine lender is allowed to enforce security;
• standstill periods (where the mezz lender must wait if there’s a default);
• what happens on insolvency; and
• payment blockages (when mezz interest/principal can’t be paid).

2) Security, Guarantees, And Ranking

Mezzanine facilities may be:

• unsecured (often where senior lenders take the full security package); or
• second-ranking secured (sometimes used, depending on the deal and existing security).

You’ll also want to look closely at whether:

• directors or shareholders are asked for personal guarantees (this can be a big risk for founders);
• there are debentures or fixed and floating charges; and
• any group companies are giving cross-guarantees.

3) Covenants (The Rules You Must Follow After You Take The Money)

Covenants are ongoing promises about how you’ll run the business, and they can be more detailed than many standard SME lending arrangements.

Common covenants include:

• financial covenants (e.g. leverage ratios, interest cover, minimum EBITDA);
• information covenants (regular reporting, budgets, forecasts);
• negative covenants (limits on new debt, acquisitions, asset sales, dividends, hiring senior staff); and
• change of control restrictions (what happens if shareholdings change).

These restrictions can feel frustrating when you’re trying to move fast - but they’re also standard risk controls for lenders. The key is making sure they’re realistic for how your business actually operates.

4) Events Of Default (What Triggers Enforcement)

Mezzanine financing documents will define “events of default”, which can trigger penalties, accelerated repayment, or enforcement.

Typical events of default include:

• missed payments;
• breach of covenants;
• insolvency-related events;
• material adverse change clauses;
• cross-defaults (a default under one facility triggers default under another); and
• misrepresentation (information you gave turns out to be untrue or misleading).

This is one reason it’s so important to ensure the deal documents accurately reflect what’s happening in the business - and that your board understands ongoing compliance obligations.

5) Equity Kickers: Warrants, Conversion, And Dilution

Many mezzanine facilities include an “equity kicker” giving the lender some upside if your business grows in value.

This might be:

• warrants (the right to subscribe for shares at a set price);
• conversion rights (the ability to convert debt into shares under certain conditions); or
• equity-linked returns tied to an exit.

These terms can directly affect:

• founder dilution;
• control and voting rights;
• future fundraising (because new investors will review the cap table carefully); and
• exit outcomes (who gets what in a sale).

If you’re issuing new shares or creating new share rights, it’s crucial that the terms match your company’s constitution and shareholder arrangements. In many cases, you’ll also be signing a formal Share Subscription Agreement to document how equity is issued and what rights attach to it.

6) Representations, Warranties, And Liability Caps

Mezzanine lenders (like equity investors) typically require the company and sometimes shareholders to give a set of representations and warranties - statements about the business that the lender relies on to decide whether to fund.

These might cover:

• ownership of assets and IP;
• no litigation;
• accuracy of financial statements;
• compliance with laws;
• no undisclosed liabilities; and
• validity of key contracts.

If those statements are wrong, the lender may have rights to claim losses or trigger a default. So it’s worth negotiating both the scope of the warranties and the risk allocation, often through mechanisms such as limitation of liability concepts (for example, caps, time limits, and disclosure processes).

What Documents Are Involved (And What’s The Legal Process)?

Mezzanine deals can sometimes move quickly, but they shouldn’t be rushed. It’s common for problems to show up later when the business wants to refinance, raise equity, or sell - and the old mezzanine terms bite back.

While every deal is different, here’s what the process often looks like for UK businesses.

Step 1: Heads Of Terms / Term Sheet

Mezzanine funding usually starts with a commercial summary setting out the big points: amount, price, fees, maturity, security, covenants, and any equity-linked rights.

Even when “non-binding”, a term sheet can still shape the legal deal heavily and can include binding provisions (like exclusivity and confidentiality). It’s worth treating it seriously and getting it reviewed early, often alongside a Term Sheet review approach.

As a general rule, you don’t want to rely on assumptions about whether something is enforceable - contract formation is technical, and the safest approach is to ensure everyone is clear on what is (and isn’t) binding. The basics of What Makes A Contract Legally Binding can be especially relevant at this stage.

Step 2: Due Diligence (The Lender’s Deep Dive)

Expect the lender to run due diligence across:

• company structure and shareholder register;
• material contracts (customers, suppliers, leases);
• employment arrangements (especially senior team);
• existing debt and security;
• IP ownership and licensing; and
• financial performance and forecasts.

This is where having clean business legals makes life easier. For example, if your key hires don’t have properly documented terms, it can create uncertainty for a lender. Getting an Employment Contract in place for key team members can help avoid delays and misunderstandings.

Step 3: Facility Agreement + Security Documents

The core mezzanine loan document is often a facility agreement setting out:

• the amount, interest, fees, repayment timetable;
• conditions precedent to drawdown (what you must deliver before funding);
• covenants and reporting requirements;
• events of default; and
• boilerplate terms (governing law, notices, assignment, etc.).

You may also see:

• debentures or other security documents;
• guarantees (sometimes from group companies, sometimes from individuals); and
• intercreditor agreements (where there is senior debt).

Some mezzanine structures are documented as deeds (or include deed-like documents such as debentures). Execution formalities matter in the UK - if they’re done incorrectly, you can end up with enforceability issues. This is why it’s important to understand Executing Contracts & Deeds requirements before you sign.

Step 4: Equity Instruments (If Applicable)

If there’s an equity kicker, you might also need:

• a warrant instrument;
• updates to your articles of association;
• shareholder resolutions; and/or
• subscription documents.

This is a common point where founders accidentally create internal inconsistencies - for example, the warrant says one thing, the articles say another, and the shareholders agreement says something else. Fixing it later can be costly (and can spook future investors).

Step 5: Ongoing Compliance And Variations

Mezzanine financing isn’t a “set and forget” arrangement. You’ll need to:

• track covenant compliance;
• deliver reports on time;
• get consents before certain actions (like acquisitions or taking on new debt); and
• formally document amendments if the deal changes.

If terms change mid-way (for example, maturity extensions or covenant resets), those changes should be properly documented rather than handled informally. Depending on the structure, that might involve an amendment agreement or even a deed of variation.

Key Takeaways

• Mezzanine financing sits between senior debt and equity, often combining loan-style repayment with equity-linked upside for the lender.
• It can be a smart option for UK businesses funding acquisitions, rapid expansion, or buyouts when bank lending alone isn’t enough and you want to avoid heavy dilution.
• The headline interest rate isn’t the whole story - covenants, events of default, subordination terms, and equity kickers often drive the real risk and cost.
• Expect a detailed legal process: term sheet, due diligence, facility agreements, security/intercreditor documents, and (sometimes) share/warrant documentation.
• Getting your internal foundations right - including shareholder arrangements and key contracts - can make mezzanine funding smoother and reduce the chance of nasty surprises later.
• Because mezzanine deals are heavily negotiated and fact-specific, it’s worth getting legal advice early (before you’re locked into terms that restrict your growth).

If you’d like help reviewing mezzanine financing terms, negotiating deal documents, or getting your business legally set up for growth, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.