Commitment Letters and “Certain Funds” Explained: How a Sponsor Proves the Money Is There Before a Pound of Debt Is Drawn — the Equity Commitment Letter, the Debt Papers, the Interim Facilities Agreement, and Why a Well-Advised Seller Never Lets Closing Depend on the Financing

The Question the SPA Never Answers: What Guarantees the Money Turns Up on Completion Day

A buyout has a timing problem hiding in plain sight. The sponsor signs the sale-and-purchase agreement — the SPA — and at that moment it is legally committed to buy the company. But the loan agreement that funds most of the purchase price is rarely finished at signing; it is a long, negotiated document that often lands only days before completion. And the debt itself is not drawn until completion day, when the money actually moves. So the seller is being asked to sign away its company to a buyer whose cash is not in the room, whose loan documents may not exist yet, and whose lenders have not transferred a penny. The obvious question — what guarantees the money turns up? — is the one the SPA does not answer on its own.

It is answered before signing, in two documents that candidates almost never read and rarely name. The equity commitment letter binds the fund to provide the equity. The debt commitment letter binds the lenders to provide the debt. Between them they let the buyer stand behind a single representation in the SPA — that it has fully committed financing for the whole consideration — and it is that representation, backed by those two letters, that gives the seller the certainty the SPA alone cannot. Financing certainty is not a completion event. It is manufactured at signing, on paper, before a pound is drawn.

The Equity Commitment Letter: the Fund’s Binding Cheque, Deliberately Capped and Limited-Recourse

The equity commitment letter — the ECL — is the fund’s written, binding undertaking to contribute a stated amount of equity to the acquisition vehicle at completion, subject only to the same conditions as the SPA itself. It is what converts “the fund intends to back this deal” into “the fund is legally obliged to fund it.” Without an ECL, the buyer at the top of the deal is a newly incorporated shell — a Bidco with no assets — and its promise to pay is worthless. The ECL puts the fund’s balance sheet behind the shell for the equity portion of the cheque.

Two features define it, and both are deliberate. First, it is capped at the equity commitment amount — the fund is on the hook for its equity cheque and not a penny more, never for the debt and never for the seller’s wider losses. Second, it is limited recourse: classically the ECL is enforceable only by the acquisition vehicle it funds, not by the seller, so the fund’s exposure runs to its own deal structure rather than to a third party. This is where UK and US practice diverge, and the difference matters. In US deals the seller has, since the litigation that followed the 2007–08 financing failures, routinely won a direct right to specifically enforce the ECL — to compel the fund to fund — which turns the ECL into a tool the seller can pull itself. In UK deals the seller more often relies on the buyer’s own SPA obligation to complete, standing behind a reverse termination fee, and does not get a direct enforcement right against the fund. Same instrument, two philosophies about who holds the string.

The Debt Commitment Letter: a Binding Agreement to Lend Before the Loan Agreement Exists

The debt commitment letter is the lenders’ side of the same problem. It is a binding agreement — signed by the arranging banks or direct lenders — to provide the debt financing on agreed terms, entered into before the full facilities agreement is negotiated. It does not stand alone: the “commitment papers” are a package — the commitment letter itself, an attached term sheet setting the economics and structure of the debt stack, the fee letters (kept separate and confidential because they carry the arranger’s economics), and, in UK and European deals, an interim facilities agreement.

The interim facilities agreement is a distinctly European answer to the timing problem, and it is the neatest illustration of what certain funds means. It is a short-form, ready-to-sign loan agreement bolted to the commitment letter, drafted so that if the full long-form facilities agreement is not finished by completion, the sponsor can simply draw under the interim agreement and close anyway. The lenders cannot hold the deal hostage to the pace of loan-document drafting, because a working loan already sits inside the commitment package. The full agreement then replaces it shortly after close. It is belt and braces, engineered so that document risk can never become funding risk.

“Certain Funds”: Financing With Almost Every Condition Stripped Out, and the Short List That Survives

A normal loan is riddled with conditions. The lender can decline to fund if any representation is untrue, if any default has occurred, if a material adverse change has hit the business, if a condition precedent is unmet. That flexibility is fatal in an acquisition: if the lender can find a reason not to fund on completion day, the sponsor cannot honour a signed SPA, and no seller would accept that risk. “Certain funds” is the drafting convention that removes the flexibility. During the certain funds period — running from signing to completion — the conditions to drawdown are stripped back to a deliberately short list, and the lenders are contractually barred from refusing to fund for anything outside it.

What survives is narrow and specific. The lenders can still decline only if the borrower is insolvent, if one of a handful of major representations is breached (typically that the borrower exists, has authority, and that the loan is legal and binding), or if a major default occurs (typically non-payment, insolvency, or a breach that goes to the deal’s validity). Everything else — the business reps, the general covenants, the ordinary defaults, and critically any material adverse change at the target — is switched off for the certain funds period. The lender takes the market and business risk of the target from signing to completion precisely because that is the risk the sponsor has already assumed by signing the SPA. The financing is made as unconditional as the acquisition, no more and no less.

A Worked Signing: What Has to Be True Before the Sponsor Can Sign the SPA

Take the same shape used across these pieces. The target runs £100m of EBITDA and the sponsor is buying at 8x, so enterprise value is £800m. The sources are £480m of debt and £320m of equity. Here is what must exist, on paper, before the sponsor is allowed to sign.

The Funding Condition the Seller Refuses: Why Closing Must Never Depend on the Debt Arriving

Once the financing is committed to certain-funds standard, a specific negotiating line follows: a well-advised seller refuses a financing condition in the SPA. A financing condition would make the buyer’s obligation to complete contingent on its debt actually turning up — pushing the risk of a financing failure onto the seller, who would sign away its deal and then discover the buyer cannot pay. Sellers reject it because the whole point of the commitment package is that the buyer has already solved its financing risk before signing. The buyer’s obligation to close is absolute; how it funds that obligation is the buyer’s problem, not a condition the seller carries.

In a UK public bid the point is not merely a negotiating preference — it is law. The Takeover Code forbids a bidder from making an offer conditional on financing, which is exactly why the Rule 2.7 announcement must carry a certain-funds cash confirmation from the bidder’s financial adviser before the bid can be announced at all. The certain-funds convention that private deals adopt by contract is, in the public market, a hard rule enforced by a regulator. Either way the outcome is the same: the seller does not accept financing risk, so the sponsor does all of the financing work up front. It is the same instinct that runs through the whole signing-to-closing gap — the seller pushes every risk it can back onto the buyer, and financing is the one risk the buyer can pre-solve entirely.

When the Money Still Doesn’t Come: the Reverse Termination Fee as the Priced Escape Hatch

No structure is perfect, and the residual case — the financing collapses despite the commitments, or the buyer simply refuses to close — has to be allocated to someone. It is not allocated through a condition; it is allocated through a price. The reverse termination fee is the sum the buyer pays the seller if it fails to complete, and in a sponsor deal the financing-failure version of it is the cap on the buyer’s exposure. If the debt genuinely falls away and the deal dies, the seller keeps the target and collects the fee; it does not get to force the sponsor to find £480m elsewhere. This is the mirror image of the ECL enforcement question: where a US seller with a specific-performance right can try to compel the equity in, a UK seller more often lives with a reverse termination fee as its remedy and its ceiling.

The size of that fee is the real negotiation. Set it high and the buyer is effectively forced to close; set it low and the buyer holds a cheap option to walk. Financing-failure reverse termination fees have historically clustered at a few per cent of equity value — the precise figure is deal-specific and worth flagging as an approximation rather than a rule — but the direction of travel matters more than the number: the higher the fee, the closer the buyer’s obligation is to absolute, and the less the seller is really carrying any financing risk at all. The fee is where the last sliver of uncertainty that certain funds cannot eliminate gets converted into money. It belongs in the same family as the break fees and deal-protection package — a price on an outcome nobody wants, not a condition on the deal itself.

UK Certain Funds vs US SunGard: the Same Problem, Two Drafting Traditions

The certainty problem is universal, but the two big leveraged markets solve it with different vocabulary, and knowing both signals cross-market fluency. The UK and European approach is the certain funds convention described above, reinforced in the public market by the Takeover Code and expressed in private deals through the interim facilities agreement and a short list of major reps and major defaults. The US approach goes by the informal name “SunGard” provisions — after a 2005 buyout whose financing papers set the template — sometimes called Xerox provisions. The SunGard limitations do the same job by a different route: they limit the conditionality of the debt so that only specified representations (broadly, the fundamental ones) and the specified acquisition-agreement representations the buyer negotiated with the seller need be true for the debt to fund. The material adverse change condition in the debt is tied to the MAC in the acquisition agreement, so the lender cannot refuse to fund on a business-condition point the buyer itself is not allowed to invoke against the seller.

Read side by side, the two conventions rhyme. Both strip the debt’s conditions back to fundamentals; both align the lender’s conditions with the acquisition agreement’s; both exist so that the buyer’s certainty to the seller is matched by the lender’s certainty to the buyer. The UK does it with a named certain-funds period and an interim facility; the US does it with SunGard limitations and specified reps. A candidate who can name both — and explain that they are two dialects of the same idea, that funding conditions must not outrun acquisition conditions — is describing a market they have worked in, not one they have read about.

The Verdict: Financing Certainty Is a Signing Problem the Sponsor Solves on Paper, Not a Completion Event

The instinct of a junior candidate is to picture financing as something that happens at completion — the day the money moves. The judgement is to see that by completion the outcome was decided long before. The work that guarantees the cash is the work done before signing: the equity commitment letter that binds the fund, the debt commitment papers and interim facilities agreement that bind the lenders, and the certain-funds standard that strips the conditions out so neither can walk. Completion is the drawdown; certainty was manufactured at signing. Everything the seller relies on is a document, not a balance.

For a student, the discipline is to hold three things together: what makes the money certain (the commitment letters written to certain-funds standard), why the seller therefore refuses a financing condition (the risk is pre-solved and, in a UK bid, a financing condition is banned outright), and what happens in the residual case where it fails anyway (a reverse termination fee, priced, not a condition). Anyone can say “the sponsor lines up its financing.” The candidate who stands out explains that the sponsor lines it up to a standard that makes it as unconditional as the obligation to buy — and that the one gap the standard cannot close is not left open, it is sold to the buyer for a fee.

Careers: This Package Is Built on Every Deal You Execute and Read on Every Deal You Diligence

For an associate at a sponsor, the commitment package is not background — it is a live workstream on every acquisition. The debt commitment letter and term sheet are negotiated in parallel with the SPA, the certain-funds conditions are argued line by line with the lenders’ counsel, the interim facilities agreement is settled so the deal can close on time, and the equity commitment letter is issued out of the fund. On the sell-side, an adviser reads the same package in reverse: the first thing a diligence lawyer checks on a leveraged bid is whether the buyer’s financing is genuinely committed to certain-funds standard, because a commitment riddled with conditions is a deal that may not close. And in a restructuring, the same instruments are re-read for where they failed — a financing that was never truly certain is often the first crack in a deal that collapsed between signing and completion.

Take Your Preparation Further

Commitment letters only make sense once you can see the money they are committing, so read this next to the Sources & Uses table, which lays out exactly what the equity and debt letters have to fund, and the LBO debt stack, the tranches the debt commitment papers actually commit. For where the certain-funds standard becomes a hard legal rule, work through Take-Privates and the UK Takeover Code; for the risk allocation this package sits inside, Conditions Precedent and the reverse termination fee in deal protection. And for the pricing risk certain funds deliberately does not cover, see how a leveraged loan is priced and the market flex the arranger keeps.

To build the sources, uses and debt schedule into a model yourself, use our LBO Model Template, and for the full set of PE interview questions and model answers — including how to talk about financing certainty under pressure — see the PE Interview Masterclass.

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