Letter of Commitment: When You Need One and Key Terms to Include

If you’re negotiating a deal, lining up funding, or bringing in a key supplier, you’ll often reach a point where everyone wants reassurance that the project is real - but you’re not quite ready to sign the final contract.

That’s where a letter of commitment can be useful.

For many small businesses, a letter of commitment is a practical way to document what’s been agreed so far, show intent, and keep momentum in negotiations. But it can also create legal and commercial risks if the wording accidentally makes you legally bound to terms you didn’t mean to lock in.

Important: This guide is general information, not legal advice. Whether a letter is enforceable is highly fact-specific and can also vary depending on which part of the UK applies (for example, England & Wales, Scotland, or Northern Ireland).

Below, we’ll break down what a letter of commitment is, when it makes sense to use one, the key terms to include, and how to avoid the common traps.

What Is A Letter Of Commitment (And Is It Legally Binding)?

A letter of commitment is a written document where one party confirms their intention to proceed with a transaction or relationship on certain terms.

In practice, you’ll see letters of commitment used for things like:

• confirming a party’s intention to enter into a future contract;
• setting out key commercial terms agreed in principle;
• giving the other side confidence to invest time or money to progress the deal; and
• recording interim obligations (like confidentiality or exclusivity) while final documents are prepared.

The big question is: is a letter of commitment legally binding?

It depends. A letter of commitment can be:

• fully binding (like a contract),
• partly binding (some clauses binding, others not), or
• non-binding (a statement of intent only).

Whether it becomes enforceable often comes down to standard contract principles - offer, acceptance, consideration, intention to create legal relations, and certainty of terms. If you want a refresher on what makes something enforceable, it helps to understand what a legally binding contract looks like in the UK.

Practical tip: Don’t assume a letter of commitment is “informal” just because it’s called a letter. Courts look at the substance and wording, not the label.

When Do Small Businesses Actually Need A Letter Of Commitment?

You don’t always need a letter of commitment - and sometimes it’s better to move straight to a proper contract. But for small businesses, there are a few common situations where a letter of commitment is genuinely helpful.

1) You’ve Agreed The Main Commercial Deal, But The Contract Will Take Time

For example, you and a supplier may have agreed pricing, volumes, and a timeline, but the full supply agreement still needs negotiation (or a lawyer needs to draft it).

A letter of commitment can keep both sides aligned while the formal agreement is prepared - especially if you need to start operational planning right away.

2) You’re Securing Funding Or A Facility

Sometimes a lender, investor, or strategic partner wants a written commitment before they allocate resources or issue final approvals. A letter of commitment can record the key terms and conditions that will later appear in the full set of documents.

In funding contexts, this document can overlap with (or sit alongside) a Term Sheet, depending on the deal structure.

3) You Want To Lock In Exclusivity While You Finalise The Deal

If you’re investing time (and professional fees) into a transaction, you might want the other side to agree not to negotiate with competitors for a limited period.

This can be a good use of a letter of commitment - but exclusivity needs to be drafted carefully to avoid disputes about what’s restricted and for how long.

4) You Need To Start Sharing Sensitive Information

When negotiations progress, you may need to disclose pricing models, customer lists, financials, or product details. A letter of commitment often includes confidentiality obligations, but in many cases it’s cleaner to use a standalone Non-Disclosure Agreement (or include an NDA-style schedule) so it’s crystal clear what must be kept confidential.

5) You’re Running A Multi-Document Negotiation

Some deals involve several moving parts - for example, a services contract, an IP licence, and a data processing schedule. In those cases, a letter of commitment can work like a roadmap for what documents will be signed, and in what order.

Depending on the context, you might instead use a Heads of Agreement or a Memorandum of Understanding. The best option depends on what you’re trying to achieve (and how much you want to commit right now).

Letter Of Commitment Vs Heads Of Terms Vs MOU: What’s The Difference?

You’ll sometimes see “letter of commitment” used interchangeably with other early-stage documents - and that’s where confusion (and risk) creeps in.

Here’s a simple way to think about it:

• Letter of commitment: often used to confirm one party’s intention to proceed, sometimes with certain obligations kicking in immediately (like exclusivity or confidentiality).
• Heads of terms / Heads of agreement: usually a summary of the key commercial terms agreed in principle, often “subject to contract” (but can still include binding clauses).
• Memorandum of Understanding (MOU): commonly used where parties want a high-level framework for collaboration, particularly where the relationship is evolving and the details will be agreed later.
• Term sheet: often used in funding/investment contexts, summarising the proposed deal terms before the long-form documents are drafted.

The key point for your business is not what the document is called, but what it says - particularly whether it clearly states what is binding and what is not.

If you’re unsure, it’s worth getting advice early (before you send the document) because fixing problems after the other side relies on it is where disputes start.

Key Terms To Include In A Letter Of Commitment (And Why They Matter)

A strong letter of commitment should do two things at once:

• move the deal forward; and
• protect your business from being accidentally locked into the wrong obligations.

Here are the most common (and most useful) terms to consider including.

1) Parties And Background

Start with the basics:

• legal names of the parties (including company numbers where relevant);
• registered addresses; and
• a short background paragraph explaining the purpose of the letter.

This is more important than it sounds - disputes often arise because the wrong entity signed (for example, a trading name rather than the legal company).

2) The Proposed Transaction Or Relationship

Be clear about what the parties are intending to do. For example:

• purchase/sale of assets or shares;
• appointment of a service provider;
• supply arrangement;
• commercial partnership; or
• funding arrangement.

At this stage, you don’t need every detail - but you do need enough clarity that everyone understands what’s being discussed.

3) Key Commercial Terms (In Plain English)

This section usually sets out “headline terms”, such as:

• price and payment structure (fixed fee, milestone-based, retainer, etc.);
• scope of work or deliverables (high level);
• timeframes and target dates;
• assumptions (for example, volume forecasts); and
• any agreed responsibilities of each party.

One common trap is including detailed terms that look final, but without the legal protections that would normally sit around them in a full contract (like limitations of liability, indemnities, or a proper disputes clause).

If you’re heading towards a services relationship, you’ll often want these commercial terms to align with what will later go into your Service Agreement.

4) “Subject To Contract” (If You Don’t Want To Be Bound Yet)

If your intention is that the letter of commitment is not binding (except for certain clauses), it’s common to say that the proposed terms are subject to contract.

But wording matters. A vague statement like “we intend to proceed” can still be argued as binding if the letter includes all material terms and shows intention to create legal relations.

A safer approach is usually:

• clearly stating which parts are non-binding; and
• listing the specific clauses that are binding (for example, confidentiality and exclusivity).

5) Confidentiality

If you’ll be sharing sensitive information, include confidentiality obligations, such as:

• what counts as “confidential information”;
• permitted use (e.g. only for evaluating the transaction);
• who it can be shared with (advisers, staff with a need to know);
• how it must be protected; and
• how long the confidentiality obligations last.

If confidentiality is critical (and it often is), you might keep it in a separate NDA so it’s not mixed up with commercial terms and “subject to contract” language.

6) Exclusivity And Non-Solicitation (If Relevant)

Exclusivity can help protect your investment of time and money in negotiations, but it can also restrict your flexibility if the deal stalls.

If you include exclusivity, set out:

• the exclusivity period (start date and end date);
• what actions are prohibited (talking to competitors, accepting other offers, etc.);
• any carve-outs (existing discussions, required disclosures); and
• what happens if exclusivity is breached.

Some businesses also include non-solicitation (e.g. not poaching staff or customers) during the negotiation period.

7) Conditions Precedent (What Must Happen Before The Deal Proceeds)

This is where you list what needs to happen before the parties enter the final agreement, such as:

• board approval;
• finance approval;
• satisfactory due diligence;
• agreement of definitive documents; and
• regulatory approvals (if any apply).

This helps avoid a common misunderstanding: one party thinks the deal is “done”, while the other thinks it’s still conditional.

8) Timetable And Next Steps

Letters of commitment work best when they keep momentum. Consider including:

• a target date for exchanging the long-form agreement;
• a proposed completion/start date;
• who is responsible for drafting the next document; and
• what information each party needs to provide (and by when).

9) Costs And Expenses

Negotiations cost money - legal fees, accounting, valuations, and internal time.

A letter of commitment can specify whether each party pays their own costs or if one party covers certain expenses (and on what conditions). This matters if the deal falls through and you’re left debating who should pay the bill.

10) Termination And Expiry

Even if the letter is mostly non-binding, you still want clarity on:

• when the letter expires (for example, automatically after 30 days);
• how either party can end negotiations; and
• which clauses survive termination (confidentiality, costs, exclusivity, etc.).

11) Governing Law And Jurisdiction

If you’re a UK business, you’ll usually want the letter governed by the laws of England and Wales (or Scotland / Northern Ireland where appropriate) and to specify the courts that will have jurisdiction.

This becomes particularly important if you’re dealing with overseas suppliers, investors, or group companies.

Just keep in mind that while governing law and jurisdiction clauses can be important (and are often drafted as standalone clauses), whether they are enforceable in a document that is otherwise described as “non-binding” will depend on the wording and context.

Common Risks And Mistakes With Letters Of Commitment (And How To Avoid Them)

A letter of commitment is meant to reduce uncertainty - but drafted poorly, it can create it.

Here are some common mistakes we see small businesses make.

Accidentally Creating A Binding Contract

This often happens when:

• the letter includes all key terms (price, scope, dates);
• the language is definitive (e.g. “will”, “shall”, “agree”); and
• there’s no clear statement that it’s subject to contract / non-binding.

If you’re not ready to be bound, your letter needs to say that clearly - and be consistent throughout.

Including Binding Obligations Without Proper Protections

Businesses sometimes include clauses like “we will supply X at £Y” without including the normal protections you’d expect in a full agreement (limits on liability, force majeure, payment timing, ownership of IP, and so on).

If you’re committing to deliver, you should usually be doing it in a properly drafted agreement, not an early-stage letter.

Vague Terms That Cause Disputes Later

Terms like “reasonable”, “ASAP”, or “commercially acceptable” can be useful, but they can also be a breeding ground for disagreement.

Where you can, define what “done” looks like (even at a high level) and give timeframes that are realistic.

Not Aligning The Letter With The Final Contract

If your letter of commitment says one thing and the final contract says another, you can end up in a messy negotiation (or worse, arguments about what was promised).

It’s often worth getting a lawyer to review the letter before it goes out, especially if the other side is likely to rely on it. A Contract Review early on can save you from paying to untangle avoidable issues later.

Forgetting Data Protection And IP Issues In Early Conversations

If the negotiations involve sharing personal data (for example, customer lists) or discussing ownership of deliverables, it’s worth thinking ahead. Even if you don’t include full IP and data clauses in the letter, you should be clear on what will be addressed in the definitive agreement so you don’t get boxed in later.

Key Takeaways

• A letter of commitment is a practical tool for small businesses to confirm intent and keep a deal moving while the final contract is being drafted.
• A letter of commitment can be binding, partly binding, or non-binding depending on how it’s written - the label doesn’t decide the legal effect.
• If you don’t want to be bound yet, include clear subject to contract language and specify exactly which clauses (if any) are intended to be binding.
• Clauses commonly drafted to take effect immediately can include confidentiality, exclusivity, and costs - and sometimes governing law and jurisdiction, depending on the wording.
• Be careful not to include “final contract” terms without the protections you’d normally have in a full agreement (like limits on liability and clear termination rights).
• Letters of commitment work best when they include clear next steps, timeframes, and any conditions that must be satisfied before the final deal is signed.

If you’d like help drafting or reviewing a letter of commitment (or turning your agreed terms into a proper contract), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.