Convertible loan notes: a flexible financing lever for UK buyers

Convertible loan notes (CLNs) are hybrid debt instruments that enable an investor or lender to advance a loan to a company with the right, or obligation, to subsequently convert that loan into equity at a future date on pre-agreed terms.

In UK practice, they are documented as loan notes paying a fixed or floating rate of interest. However, unlike standard vendor or bank debt, they embed conversion mechanics tied to events such as a funding round, company sale or other defined triggers.

For a quick summary, please scroll to the bottom of this page to view the infographic.

In M&A, UK buyers can feasibly use CLNs as a flexible component of a consideration and/or deal financing. A buyer may issue CLNs to a seller as deferred payment (a vendor CLN) instead of full cash at completion, or feed CLNs into a target as bridge funding that later converts when a buy-out or equity round completes, allowing acquirers to conserve cash, share risk with vendors and delay hard valuation decisions.

With M&A financing conditions remaining tight, CLNs increasingly have the potential to emerge as a valuable tool for UK buyers to stretch cash, manage valuation risk and keep sellers engaged in private-company acquisitions, especially in vendor-financed and tech/growth deals.

CLNs in UK M&A
UK acquirers most often encounter loan notes as straight vendor debt in sale and purchase agreements, but these can also be structured as convertible, enabling sellers or co-investors to flip these into equity in the buyer or target on agreed triggers.

Such CLNs can sit alongside vendor loan notes, earn-outs and senior bank debt in UK deals, such as management buy-outs and PE-backed transactions, providing buyers with an extra lever to balance cash, control and future upside.

Core niches where buyers use CLNs
CLNs can be used by UK buyers across three practical niches: as part of the purchase consideration, as vendor finance in MBOs and as bridge/control instruments into tech and scale-up targets.

In each case, the CLN can enable the buyer to defer payment, share risk with the seller and delay harder valuation calls until a clearer funding or exit event.

Vendor CLN as consideration
The use of a vendor CLN as part of an M&A consideration may involve a buyer acquiring 100 per cent of a private company and paying through a mix of cash, ordinary vendor loan notes and convertible loan notes, with the CLN giving the seller a right to convert into buyer equity on events such as a future sale of the business, IPO or covenant breaches.

This reduces day-one cash for the buyer, aligns the seller economically with post-deal performance and allows the buyer to settle part of the price in shares rather than cash, if the business generates growth post-acquisition.

Vendor CLNs in MBO funding
Guidance on UK MBOs shows Newcos funded by management and PE investors issuing CLNs to exiting shareholders (and sometimes to the PE fund) as part of the price, with conversion into Newco equity if there has been no exit by a long-stop date or on change of control.

This can prove attractive to incoming management teams because it protects cash flow in the early years, preserves flexibility around refinancing and lets equity participation evolve if the deal’s exit plan slips.

CLNs into the target as a “flip” tool
Tech and growth-company practice can involve buyers or VCs advancing CLNs directly into the target to fund expansion, secure information and veto rights and attach options or warrants.

Upon a later qualifying funding round or sale, the CLN converts into a significant minority stake or automatically flips into equity on share purchase, providing the investor with a platform for a fuller buy-out at a pre-agreed valuation or discount.

Plugging the debt gap with a CLN
Justus Luttig set out to acquire and consolidate two asset-light trades businesses, now operating as Copeland Home Services, with combined annual earnings of roughly $1.5m.

The difficulty lay in the debt tranche of the deal. With no property or other substantial tangible assets to lend against, Luttig was unable to secure conventional bank finance. Regional banks, he found, "really dislike" cash-flow-only deals and declined, while larger banks considered the deal too small to bother with.

That left Luttig with the option of specialist lenders, such as credit funds and family offices, who would lend against cash flow but priced the risk aggressively. Their terms stacked a low-teens cash interest rate, PIK (payment-in-kind) interest accruing on top, as well warrants that diluted every holder on the cap table. This resulted in an all-in cost in the mid-to-high teens.

Luttig came close to accepting this "expensive piece of paper," but his equity investors balked at the warrants and the cost.

That rejection opened an alternative. Rather than borrow at around 15 per cent from the market, Luttig asked his existing equity investors to provide the debt themselves at 12 per cent, a strong risk-adjusted return for parties who already held board seats and downside protection.

On a fellow investor’s suggestion, the structure was then refined into a convertible loan note, with a term of one to three years.

The appeal of the instrument was the cushion it provided for the business if growth did not materialise as planned. If the debt could not be repaid or refinanced by the end of the term, the balance converted to equity rather than forcing a default.

As Luttig put it: “It gives the company a get-out-of-jail-free card - not free, because you get diluted when it converts, but it at least buys you time and avoids getting into a cash crunch.”

The cost of that flexibility was dilution - Luttig, his investors and the rolled-over sellers would all hold less equity on conversion - but a liability that converts, he noted, is “not fatal to the business.”

The CLN, sitting alongside seller rollover, seller notes and investor equity, ultimately clinched the transaction, which closed in September 2025. Luttig retained roughly 25–30 per cent ownership, in line with a traditional search-fund model.

Key structuring levers for UK buyers
UK legal and advisory sources tend to converge on a predictable set of levers in CLN instruments that buyers can tune to fit their acquisitions. The most important variables are triggers, pricing, interest/maturity, security and governance rights, all of which need to be anchored to what the buyer wants the CLN to achieve in the deal.

Trigger events and conversion mechanics
Common CLN triggers in UK practice include the next priced equity round, a sale or IPO of the buyer or target and maturity where notes have not been redeemed. Conversion prices are set either as fixed per-share levels, discounts (for example 20 per cent to the next round price) or via valuation caps that protect investors from overvaluation.

Pricing, interest, maturity and security
UK CLNs on private deals often pay a modest rate of interest, which can either be paid out in cash or rolled up and added to the balance that eventually converts into shares. They usually run for one to five years, timed to match when the buyer expects to refinance or exit, and can be set up either as simple unsecured vendor-style IOUs or as notes secured on assets but sitting behind the banks in the repayment queue.

Governance rights and protections
CLN holders in UK deals usually negotiate events of default, information rights and consent rights over fundamental corporate actions such as major capital changes or incurring senior debt above agreed levels.

Buyers must balance these protections against UK tax and regulatory restrictions: excessive veto or operational control can jeopardise SEIS/EIS (Seed Enterprise Investment Scheme/Enterprise Investment Scheme) relief in related structures and constrain post-deal flexibility.

Tax and accounting considerations
HMRC guidance on special securities and loan relationships means the tax treatment of CLN interest and returns depends on whether the note behaves like straightforward debt or equity-like profit participation.

Where some of the share sale price is paid in loan notes, buyers and sellers may try to structure things so that the seller’s gain can be rolled over for capital gains tax purposes. To have a chance of achieving that, the way the loan note converts, how it is secured and how the return is paid must be carefully designed and often run through specialist tax modelling.

Strategic advantages for UK buyers
CLN-heavy deal structures can potentially provide UK acquirers with material strategic advantages over pure cash or equity-only consideration. These advantages are most visible in cash conservation, risk-sharing, valuation flexibility and execution speed.

Conserving cash at completion: Swapping part of cash consideration for vendor CLNs allows buyers to close larger or earlier deals while preserving liquidity for post-acquisition investment.

Risk-sharing with sellers or co-investors: Tying seller returns to interest, conversion prices and future equity value keeps them economically engaged and aligned with the buyer’s growth plan.

Valuation flexibility: Deferring price discovery to a later funding round or exit, with discounts or caps, helps avoid contentious valuation debates in early-stage tech acquisitions.

Execution speed: CLNs can often be put in place more quickly and at lower cost than issuing new shares, because they avoid immediate reengineering of the company’s ownership structure.

Common pitfalls UK buyers should avoid
There are potential recurring problems when CLNs are bolted into deals without clear design or modelling. Here is a practical checklist of pitfalls to avoid.

Over-complex conversion formulas: Multi-layer discounts, caps, ratchets and performance adjustments create fertile ground for disputes and exit friction if triggers are ambiguous.

Maturity misaligned with business plan: Notes falling due before realistic refinance or exit windows can force distressed refinancing or trigger default covenants at the worst time.

Cap-table blind spots: Buyers frequently underestimate cumulative dilution when multiple CLNs, options and warrants stack at exit or the next round.

Tax leakage: Poor design can deny interest deductibility, undermine intended roll-over treatment for vendors, or cause SEIS/EIS failure for early-stage co-investors.

Bank covenant conflicts: Senior lenders may insist on subordination and tight restrictions on CLN redemption, and can treat PIK interest as leverage in covenant calculations.

Actionable lessons for UK buyers
1. Be explicit about the CLN’s role
Before drafting, buyers should decide whether the CLN is primarily vendor finance, a control/option mechanism or a pricing deferral tool. Then it is important to tie triggers, interest and conversion price back to that purpose.

Clarity at this stage reduces later complexity and ensures each party understands whether they are primarily lending, co-investing or deferring valuation.

2. Keep triggers and pricing simple
Using one or two clear triggers - such as a sale or defined “qualifying round” - and a straightforward pricing mechanism (fixed price, discount or cap) materially reduces disputes; combining all three should be reserved for exceptional circumstances.

Buyers should model dilution under each trigger so that management, vendors and incoming investors remain within tolerable ownership ranges.

3. Align maturity with exit and refinance windows
For buy-outs and PE-backed deals, the CLN end date should line up with when the buyer realistically expects to refinance its bank debt or sell the business, with some extra time built in for slippage.

Allowing a short grace period to fix problems, and treating minor breaches more flexibly, can stop one-off technical defaults from giving noteholders disproportionate bargaining power.

4. Integrate CLNs into bank and equity stacks early
Because banks will usually insist that CLNs sit behind their own lending and limit when they can be repaid, buyers should bring senior lenders into the conversation early and build those requirements into the CLN terms from the start.

Similarly, if there are SEIS/EIS-backed investors in the structure, their money is generally better put in straightforward equity or SEIS/EIS-compliant ASAs/SAFEs, and CLNs kept for investors who are not relying on those tax reliefs.

5. Build and share cap-table waterfall models
A simple waterfall model covering no conversion (cash repayment), conversion in a down round, and conversion on target and stretch exit valuations will highlight hidden dilution and control shifts.

Sharing this with management, vendors and key investors fosters informed consent and reduces surprises when liquidity events occur.

6. Pay careful attention to default and control rights
Events of default, acceleration mechanics and any mandatory conversion or redemption on default should be drafted clearly and mapped to the buyer’s operational reality.

CLN-holder consents should be limited to genuinely fundamental matters, with day-to-day control firmly in the boardroom to avoid creeping co-control and regulatory complications.

7. Treat tax as a design variable, not an afterthought
UK buyers should treat tax as part of instrument design, obtaining specialist modelling and, where possible, HMRC clearances on loan-relationship treatment, interest deductibility and vendor capital vs income treatment.

This is particularly important when CLNs are used as share consideration in roll-overs or in transactions that sit alongside SEIS/EIS investors.

A buyer considering a CLN should begin by deciding exactly what problem the instrument is meant to solve. If the real issue is deferred consideration, the CLN should be drafted primarily as a vendor-finance tool; if the issue is valuation uncertainty, the conversion economics should reflect this from the outset.

Terms should be kept simple wherever possible. One or two clear triggers and a straightforward pricing mechanic will usually serve buyers better than an instrument loaded with discounts, caps and multiple fallback formulas.

Buyers should also involve senior lenders, tax advisers and cap-table modellers early, because the success of a CLN structure often depends less on concept than on how cleanly it fits into the wider deal package.

For buyers who are aware of the wide-ranging implications of using CLNs in M&A, they have the potential to emerge as a valuable tool, enabling buyers to structure their deals more effectively, stretch cash further and, ultimately, increase their chances of closing deals successfully.


Click here to download a template Convertible Loan Note instrument for a deferred consideration in an M&A deal

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