What is a letter of intent and is it legally binding?

The parties may spend months negotiating a final contract but start working together under a letter of intent within days. This approach can speed up the transaction while creating uncertainty: which terms are already binding, and which remain subject to negotiation? The answer depends not on the document’s title but on its content, the applicable law, and the parties’ conduct. Unclear wording may lead to disputes over exclusivity, costs, confidentiality, or even the existence of the main contract. In this article, we explain how a letter of intent works, when it becomes legally binding, and how to distinguish binding from non-binding provisions.

What is a letter of intent and why do companies use it?

A letter of intent (LOI) is a preliminary document that records the main terms of a proposed transaction before the final agreement is signed. It shows serious intent, sets the scope of negotiations, and helps identify key disagreements before lengthy and costly transaction documents are prepared.

LOIs are often used for:

• Buying or selling a company;
• Raising investment or forming a joint venture;
• Entering into major supply agreements;
• Transferring technology or intellectual property;
• Commercial leases and financing;
• Launching projects that require due diligence or regulatory approval.

The document may cover the price, transaction structure, deadlines, financing terms, due diligence, and required corporate approvals. It also often includes confidentiality, exclusivity, governing law, and cost allocation provisions.

An LOI does not replace the final agreement and has no single legal status. It may be entirely non-binding, make only specific provisions binding, or operate as a full agreement. Its legal effect therefore depends not on its title but on its wording, content, and applicable law.

Letter of intent vs term sheet, MOU and heads of terms

Letters of intent, term sheets, memoranda of understanding, and heads of terms are used to record preliminary agreements. However, these titles do not create automatic legal consequences. The same term may describe either a short transaction outline or a partly binding agreement.

Letter of intent

An LOI usually reflects an intention to complete a transaction and provides a basis for further negotiations. It may include commercial terms, due diligence procedures, deadlines for preparing the final agreement, and specific binding clauses. LOIs are common in M&A, investment, and international commercial transactions.

Term sheet, MOU, and heads of terms

A term sheet is usually a short summary of key financial and commercial terms. An MOU often describes the agreed understanding, division of roles, and shared objectives. Heads of terms serve a similar purpose and are widely used in corporate, financial, and property transactions.

Regardless of its title, the document’s legal effect depends on:

• The intention to create obligations;
• The certainty and completeness of the agreed terms;
• The use of wording such as binding, non-binding, or subject to contract;
• The applicable law;
• Actions taken after signing.

Renaming an LOI as an MOU or term sheet does not remove the risk of creating obligations. The document’s content remains decisive.

Is a letter of intent legally binding?

The legal effect of an LOI depends on the applicable law and the circumstances of the transaction. Its wording, completeness of agreed terms, correspondence, and post-signing actions may all be considered.

Intention to create legal relations

The terms non-binding and subject to contract show that the main contract will not arise until the definitive agreement is signed. However, the disclaimer must be clear and consistent with the rest of the LOI. If the document also requires the transaction to be completed, payment to be made, or work to begin, its general non-binding status may not be enough.

A partly binding LOI must clearly separate its provisions. Commercial terms may remain subject to negotiation, while confidentiality, exclusivity, governing law, and dispute resolution clauses take effect upon signing.

Certainty of terms

A contract requires sufficiently certain essential terms. Depending on the transaction, these may include:

• The subject and scope of obligations;
• The price or pricing mechanism;
• Performance deadlines;
• Payment terms;
• Termination conditions.

If key issues remain open for negotiation, the LOI is less likely to qualify as a full contract. However, missing details do not always prevent enforceability if the agreement’s content can be established from the document, correspondence, and established business practices.

Conduct of the parties

Post-signing conduct may affect the LOI’s legal status. Starting production, transferring assets, paying invoices, or providing services may show an intention to create contractual relations, even without a signed final agreement.

After signing a non-binding LOI, the parties should act consistently with its status. If work must begin before the main contract is signed, a separate interim agreement is safer. It should define the scope of work, payment terms, duration, risk allocation, and termination rights.

Which LOI clauses are usually legally binding?

Even if the main commercial terms of an LOI are non-binding, specific provisions may create separate obligations. They should be clearly listed in the section covering the document’s legal effect.

The following provisions are most often binding:

• Confidentiality. Defines what information must be protected, who may receive it, and when it must be returned or destroyed.
• Exclusivity. Prevents one or both parties from negotiating with other potential counterparties for a set period.
• Due diligence. Regulates access to company documents, systems, premises, and representatives.
• Costs. Determines who pays for advisers, reviews, document preparation, and other transaction expenses.
• Intellectual property. Limits the use of shared materials, technology, brands, and work products.
• Non-solicitation. Restricts the recruitment of the other party’s employees or solicitation of its clients and suppliers.
• Governing law and dispute resolution. Specifies the applicable law and competent court or arbitration forum.
• Term and termination. Sets the LOI’s duration, termination grounds, and provisions that survive expiry.

An obligation to negotiate in good faith requires separate review. In some jurisdictions, an agreement to continue negotiations may be unenforceable if it is too uncertain. The UNIDROIT Principles may also apply in international transactions. They allow a party to end negotiations but provide for liability where it acts in bad faith.

Binding clauses must be precise and consistent with the non-binding status of the main transaction terms. Otherwise, the dispute may concern the LOI itself rather than the proposed transaction.

Main legal risks of signing a letter of intent

An unclear LOI may restrict negotiations, create unexpected costs, or cause a dispute over whether a contract exists. The main risks arise from the document’s wording and post-signing conduct.

Unintended contract formation

The risk increases when an LOI uses mandatory language, contains sufficiently certain commercial terms, and requires performance to begin. Terms such as shall, must, agrees to purchase, or undertakes to complete may conflict with its stated non-binding status.

The problem becomes more serious when deliveries, services, or payments begin before the definitive agreement is signed. Specific provisions or the entire document may then be treated as binding.

Unclear or conflicting provisions

An LOI may describe the transaction as preliminary while requiring its completion on agreed terms. Other common mistakes include an undefined exclusivity period, unclear termination rules, and conflicts between the LOI and NDA.

Obligations to agree on remaining terms or continue negotiations until a result is reached are particularly risky. Their enforceability depends on the governing law, precise wording, and objective performance criteria.

Financial and commercial consequences

A poorly drafted LOI may lead to:

• Liability for damages or negotiation costs;
• Disputes over breaches of exclusivity or confidentiality;
• Restrictions on negotiations with other counterparties;
• Disclosure of commercially sensitive information;
• Claims for payment for completed work;
• Delay or termination of the main transaction;
• Court or arbitration proceedings.

Before signing, the parties should assess both the proposed transaction and any obligations that apply even if it is not completed.

How to draft a clear and enforceable letter of intent

An LOI should reflect the current stage of negotiations and avoid obligations the parties are not ready to accept. Before signing, check the following:

• State whether the document is fully or partly non-binding;
• List all provisions with binding status;
• Use subject to contract where the transaction depends on signing a definitive agreement;
• Separate agreed terms from issues still under negotiation;
• Exclude any duty to complete the transaction before due diligence and required approvals;
• Define the duration of confidentiality and exclusivity obligations;
• Set the LOI termination process and the consequences of expiry;
• Allocate adviser, review, and document preparation costs;
• Choose the governing law and dispute resolution method;
• Confirm the authority of each signatory;
• Align the LOI with the NDA and other preliminary agreements;
• Prohibit performance without separate written approval or an interim agreement.

If deliveries, development, or services must begin before the main contract is signed, these activities require detailed rules. A separate interim agreement can define the scope of work, payment, liability, rights to work products, and maximum expenditure.

Industry restrictions, corporate approvals, and regulatory conditions should also be reviewed before signing. This is especially important in M&A, financial, technology, and cross-border transactions that require third-party or regulatory approval.

How Key2Law helps businesses prepare and review letters of intent

The Key2Law team advises companies on preliminary arrangements for international, corporate, and investment transactions. We assess the parties’ objectives, define an appropriate scope of obligations, and structure the LOI to support further negotiations.

Key2Law can assist with the following:

• Select the right format for the preliminary agreement;
• Draft or review a letter of intent;
• Clearly separate binding and non-binding provisions;
• Develop confidentiality and exclusivity clauses;
• Define the scope and conditions of due diligence;
• Agree on cost, termination, and non-solicitation provisions;
• Select the governing law and dispute resolution mechanism;
• Assist with negotiations between the parties;
• Align the LOI with the NDA, term sheet, and interim agreements;
• Review required corporate and regulatory approvals;
• Prepare definitive transaction documents;
• Assess risks before performance begins.

Planning to sign an LOI or reviewing a draft from a potential counterparty? Contact the Key2Law team to check its terms, remove ambiguous wording, and record the agreement without unintended obligations.

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This article is provided for general informational purposes and does not constitute legal, tax or financial advice. Applicable requirements depend on the jurisdiction and specific circumstances; professional advice should be obtained before making legal or business decisions.