What Are Commitment Letters?

If you’re raising finance or closing an investment, there’s a good chance a lender or investor will ask you to sign a commitment letter. It can look straightforward at first glance - a few pages setting out the key terms - but it carries real legal and commercial weight.

Handled well, a commitment letter can secure funding on fair terms and keep your timeline on track. Handled poorly, it can lock you into unfavourable fees, restrictive covenants, or an exclusivity period that stalls your other options.

In this guide, we unpack what a commitment letter is, what it should include, when it’s binding, and how to negotiate terms that protect your business from day one.

What Is A Commitment Letter (And When Do UK SMEs Use One)?

A commitment letter is a document issued by a lender or investor setting out their intention to provide funding, subject to conditions. You’ll see them most often in:

• Debt facilities - overdrafts, term loans, receivables finance, asset finance, and revolving credit lines.
• Project or acquisition finance - where timing and conditions precedent need to be nailed down clearly.
• Equity or hybrid rounds - sometimes used alongside a Term Sheet to record investor commitments ahead of final documents.

Think of the commitment letter as the commercial “bridge” between a proposal and the full funding documents. It typically comes after heads of terms are agreed, and before you sign your definitive agreements (for example, a Loan Agreement or a Share Subscription Agreement).

Commitment Letter Vs Term Sheet Vs Facility Agreement

These documents sometimes overlap, but they have different roles.

Term Sheet

A term sheet records the headline deal points you and a funder have agreed in principle (e.g. pricing, valuation or interest rate, security, timetable). A well-drafted Term Sheet helps align expectations early and reduces “surprises” in the long-form documents. Most commercial terms are non‑binding at this stage, though confidentiality and costs can be binding.

Commitment Letter

The commitment letter goes a step further. It states that the funder is prepared to proceed on defined terms, usually subject to conditions precedent, due diligence, internal approvals, and final documentation. Some parts of a commitment letter are commonly binding - for example, exclusivity, break fees, cost reimbursement, and governing law.

Facility/Subscription Agreement

These are the detailed, legally binding contracts that govern the funding relationship - such as your Loan Agreement for debt, or a Share Subscription Agreement for equity. They include the full set of representations, covenants, events of default, mechanics, and boilerplate clauses.

What Should A UK Commitment Letter Include?

There isn’t a single “standard”, but most commitment letters cover the following areas. If a clause is missing, ask yourself whether you’re comfortable leaving it open - or whether you should pin it down now to avoid drift in the final documents.

Parties And Purpose

• Who is providing the funding (and are there multiple lenders/investors)?
• Which entity in your group is the borrower/issuer?
• What the facility is for (e.g. working capital, capex, acquisition), especially if there will be use‑of‑proceeds restrictions.

Type Of Funding And Amount

• Facility type (term loan, revolving credit, asset finance; or equity subscription).
• Facility limit/commitment amount, currency, and any accordion/increase features.
• Availability period and drop‑dead date.

Pricing And Fees

• Interest rate or margin and the reference rate (e.g. SONIA) for debt.
• Arrangement, commitment and utilisation fees; any break fees if you don’t proceed.
• Cost reimbursement (e.g. due diligence, legal costs) - a common binding obligation.

Conditions Precedent (CPs)

• Corporate approvals (board minutes, Board Resolutions, shareholder approvals where required under the Companies Act 2006).
• Delivery of final documents (e.g. facility agreement, security documents, guarantees).
• Financial information (management accounts, forecasts) and satisfactory due diligence.
• Evidence of insurances, consents, and any third‑party waivers.

Security And Guarantees (If Debt)

• Whether the facility will be secured or unsecured, and the type of security (e.g. debenture, fixed/ floating charge, asset‑specific security).
• The security package may reference a General Security Agreement and registration at Companies House.
• Any cross‑company or director guarantees, often documented in a Deed of Guarantee and Indemnity.

Key Covenants And Undertakings

• Financial covenants (leverage, interest cover, minimum liquidity) and testing schedule.
• Information undertakings (management accounts, audited financials, notice of default).
• Operational restrictions (no further debt, no disposals, negative pledge, change‑of‑control controls).

Drawdown Mechanics And Timetable

• Notice periods for utilisation and any minimum/maximum draw amounts.
• Long‑stop dates and conditions to first draw.
• Milestones if funds are released in tranches.

Events Of Default And Remedies

• High‑level list of default triggers (non‑payment, breach of covenants, insolvency, MAC, cross‑default).
• Reference to standardised definitions to be expanded in the facility agreement. If you’re new to these, it’s worth reading through Events of Default to understand the common triggers.

Binding And Non‑Binding Clauses

• State clearly which provisions are binding now (often exclusivity, costs, confidentiality, governing law, process) and which are subject to contract.
• Duration of exclusivity and the consequences of breach.

Confidentiality And Financial Promotions

• Mutual confidentiality is common. If sensitive information will be shared, consider a separate NDA.
• Be mindful that funders’ communications can be “financial promotions” under the Financial Services and Markets Act 2000 - regulated firms will usually manage this, but it’s good practice to keep public statements aligned with the letter.

Is A Commitment Letter Legally Binding?

In UK practice, a commitment letter often mixes binding and non‑binding provisions. The core funding terms are usually “subject to contract”, while specific obligations can bind immediately. To avoid disputes, the letter should be explicit about status.

Commonly Binding

• Exclusivity/no‑shop clauses (you agree not to seek or negotiate alternative funding for a set period).
• Fee and cost reimbursement obligations.
• Governing law and jurisdiction.
• Confidentiality and announcement restrictions.

Commonly Non‑Binding (Subject To Contract)

• Facility amount, pricing, and covenants (until final documents are signed).
• Security package and detailed events of default.
• Detailed drawdown mechanics and representations/warranties.

Courts look at substance over labels, so simply writing “non‑binding” won’t save an exclusivity clause from being enforceable. Make sure the drafting is clear and internally consistent. If anything must not be binding until signing, say so in plain language.

How To Negotiate A Commitment Letter: Practical Tips For SMEs

Even if you’re eager to lock in funding, a few targeted negotiations at the commitment letter stage can save a lot of pain later.

1) Narrow The Binding Bits

Keep binding obligations limited to what is truly necessary (e.g. confidentiality and costs). Avoid broad “commitments” that could be read as an obligation to take the facility regardless of what due diligence reveals.

2) Manage Your Exclusivity Window

Exclusivity can be reasonable, but time‑box it (e.g. 30–60 days), tie it to funder milestones, and include carve‑outs if the funder changes key economics or misses deadlines. Consider a finite break fee rather than uncapped costs.

3) Cap Fees And Costs

Ask for fee caps, pre‑approval for third‑party costs, and clarity on what you’re paying for (e.g. external legal fees only). Build these into the letter so there’s no ambiguity.

4) Align With Your End Documents

Push for enough detail to avoid drift between the letter and your Loan Agreement or subscription agreement. If a lender expects a specific security or covenant package, get that stated at headline level now.

5) Think About Alternatives

If debt terms are overly tight for an early‑stage company, equity or hybrid instruments like an Advanced Subscription Agreement or a SAFE Note may be more flexible. Having credible alternatives strengthens your negotiating position.

6) Keep Your Timeline Realistic

Conditions precedent take time (especially if you need landlord waivers, third‑party consents, or to file security). Agree a timetable that fits real‑world logistics so you don’t immediately breach the letter’s long‑stop date.

Legal Considerations And Common Pitfalls In The UK

Beyond the commercial points, there are a few legal traps to watch out for when issuing or signing a commitment letter.

Corporate Authority And Approvals

Make sure the entity signing has the power to do so and that you’ve lined up internal approvals. In many cases, lenders will require board minutes or Board Resolutions authorising the facility and security under the Companies Act 2006.

Security Filings And Priorities

If security is contemplated, the letter should flag the security type and any intercreditor priorities. Expect filings at Companies House within 21 days once the General Security Agreement is signed. If existing lenders hold security, you may need consents or a deed of priority.

Director Guarantees And Personal Risk

Personal guarantees can be significant commitments. If the letter requires a Deed of Guarantee and Indemnity, clarify the cap, duration, and triggers for enforcement - and consider whether insurance or alternative structures could reduce personal exposure.

Events Of Default And Cross‑Defaults

Default triggers in the final facility will often mirror what’s outlined in the letter. Watch for “hair‑trigger” defaults or cross‑defaults to unrelated obligations. It’s worth mapping how typical Events of Default could impact your operations before you commit.

Data Protection And Confidentiality

Due diligence often involves sending financial and operational data to a funder. Under UK GDPR and the Data Protection Act 2018, ensure you only share what’s necessary, under an appropriate confidentiality framework, and that personal data is protected.

Financial Promotions And Unregulated Lenders

Most SME debt is arranged by authorised firms, but if you’re dealing with an unregulated party, be cautious around public communications. If the transaction strays into regulated territory, you may need authorised sign‑off on any invitations or inducements.

Step‑By‑Step: From Commitment Letter To Completion

Here’s a simple roadmap to keep your process on track.

Step 1: Align On Heads Of Terms

Confirm the main commercial points and decide which provisions (if any) should be binding now. If equity is in play, a concise Term Sheet keeps everyone aligned.

Step 2: Draft And Negotiate The Commitment Letter

Keep the binding scope tight, set sensible timelines, and call out the expected security, covenants and CPs at a headline level. Confirm who pays fees and when.

Step 3: Prepare The Definitive Agreements

Work with your funder’s lawyers to finalise the Loan Agreement or subscription agreement, plus any security documents and guarantees. Check the final documents match the commitment letter to avoid “scope creep.”

Step 4: Obtain Approvals And Satisfy CPs

Complete board approvals, deliver financials and insurances, line up landlord or supplier consents, and prepare filings for any security. If the package includes a General Security Agreement, plan for Companies House registration immediately after signing.

Step 5: Completion And First Draw

Once CPs are satisfied (or waived), sign and exchange the final documents, fund the facility or issue the shares, and diarise covenant testing and reporting dates so nothing slips post‑completion.

When Might You Not Need A Commitment Letter?

Not every deal needs a standalone commitment letter. For smaller or simpler facilities, you might move straight from an offer letter to a facility agreement. In equity rounds, some founders proceed from a high‑level heads of terms straight to long‑form documents (especially with standardized frameworks like an Advanced Subscription Agreement or a SAFE Note). The key is clarity: if you’re skipping the commitment letter, ensure that any binding obligations (like exclusivity or costs) are captured in another suitable document.

Key Takeaways

• A commitment letter records a funder’s intent to provide finance on defined terms, usually subject to conditions precedent and final documents.
• Clarify which provisions are binding now (often exclusivity, fees, confidentiality, governing law) and keep the binding scope as narrow as practical.
• Set out the big‑ticket items up front - amount, pricing, security, covenants, CPs, timeline - to avoid surprises in the long‑form agreements.
• Watch common risk areas: broad exclusivity, uncapped costs, onerous covenants, and personal guarantees without clear limits.
• Align the commitment letter with your definitive agreements such as your Loan Agreement, and plan early for board approvals, consents and filings.
• If debt terms feel too restrictive, consider alternatives like an Advanced Subscription Agreement or a SAFE Note to bridge your funding needs.

If you’d like help drafting or negotiating a commitment letter - or sense‑checking how it ties into your financing documents - you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no‑obligations chat.