A Memorandum of Understanding (MOU) (also called heads of terms or a letter of intent) is a short document recording what two or more parties have agreed in principle before they sign a full contract. Your business does not have to use one, but for collaborations, joint ventures and deals in progress, an MOU can save time, prevent misunderstandings and keep negotiations on track. Here is when one helps, and how binding it is.
What an MOU is for
An MOU sets out the shared understanding of the parties: who is involved, what each will contribute, the broad commercial terms, and the intended next steps. Businesses commonly use them to:
- frame a partnership or collaboration before the detailed agreement;
- record the key terms of a deal in progress (such as buying a business or assets);
- give comfort to funders or stakeholders that the parties are serious; and
- identify deal-breakers early, before spending money on lawyers and due diligence.
Is an MOU legally binding?
Usually not, at least as to the main commercial terms. An MOU is generally a statement of intent, not a contract. To make that clear, MOUs are normally marked "subject to contract", which usually creates a strong presumption that the main commercial terms are not yet binding. However, this label is not an absolute guarantee: it does not prevent expressly binding ancillary clauses (such as confidentiality or exclusivity) from taking effect, and it cannot always override the substance of what was agreed.
But wording is everything. If an MOU is detailed and unconditional, a court could find that the parties intended to be bound by some or all of it, but intention alone is not enough: enforceability also requires sufficiently certain terms and consideration (unless the document is executed as a deed). So if you do not want it to bind, say so expressly; and if you do want certain parts to bind, say that too.
The parts that are often made binding
Even in a "non-binding" MOU, parties usually make a few clauses binding because they need them to work during negotiations:
- Confidentiality, protecting information shared in discussions.
- Exclusivity / lock-out, agreeing not to negotiate with others for a specified period. For this to be enforceable, it should be expressly binding, supported by consideration, and limited to a clearly defined period; a bare agreement to negotiate in good faith is generally unenforceable.
- Costs, who bears their own costs if the deal collapses.
- Governing law and jurisdiction for the MOU itself.
A well-drafted MOU states clearly which clauses bind and which do not.
When you might not need one
For a simple, quick transaction, an MOU can be unnecessary overhead, you may be better going straight to a short contract. MOUs add the most value where the deal is complex, will take time, or involves multiple parties.
Practical tips
- Use an MOU for complex or multi-party deals and collaborations.
- Mark the commercial terms "subject to contract".
- Make confidentiality and any exclusivity expressly binding.
- Keep it short, the detail belongs in the full agreement.
- Have it reviewed so the binding/non-binding split is clear.
Key takeaways
- An MOU records terms agreed in principle; it is not compulsory but useful for complex deals and collaborations.
- It is generally not binding on the main deal, mark it "subject to contract".
- Confidentiality, exclusivity and costs clauses are often deliberately made binding.
- Clear wording prevents an MOU from binding (or failing to bind) by accident.
Sources
- English contract law on intention to create legal relations and "subject to contract"
- Common practice on binding confidentiality and exclusivity provisions in MOUs/heads of terms
--- This article is general information about the law of England & Wales as at 2026, not legal advice. For advice on your circumstances, consult a qualified solicitor.