Letter of Intent (LOI) Guide: What It Is and How to Write One (2026)

What Is a Letter of Intent and Is It Legally Binding?

A letter of intent (LOI) is a short, written document that outlines the preliminary terms of a proposed business deal before a formal contract is signed. Most LOI terms are non-binding — meaning neither party is legally required to complete the transaction — but specific clauses such as confidentiality, exclusivity, and governing law are typically made enforceable. The document's label as an "LOI" does not automatically determine its legal effect; courts look at the actual language and the conduct of the parties.

Key takeaways

• An LOI signals serious intent and structures early negotiations without creating a full contractual obligation.
• Clauses covering confidentiality, exclusivity, and governing law are routinely made binding even in an otherwise non-binding LOI.
• Words like "shall," "agree," and "commit" can inadvertently make non-binding terms enforceable — use "intend," "propose," or "expect" instead.
• A signed LOI typically triggers the due diligence phase in M&A transactions.
• Courts focus on the objective language of the document, not what either party privately meant.

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When Is a Letter of Intent Used?

A letter of intent fits any situation where parties want to confirm shared interest and set a negotiating framework before investing in full contract drafting. Common use cases include:

Context	What the LOI Typically Covers
Business acquisition (M&A)	Purchase price, deal structure (asset vs. stock), exclusivity, due diligence timeline
Real estate	Purchase price, contingencies, closing date, deposit terms
Joint venture or partnership	Proposed ownership split, each party's contributions, governance approach
Licensing or distribution deal	Proposed territory, royalty range, exclusivity, term
Strategic investment	Valuation range, proposed stake, key conditions to closing
Employment (executive hire)	Compensation structure, start date, equity terms, conditions

An LOI makes the most sense when the deal is complex, when significant due diligence or legal work is needed before both sides are ready to commit, or when either party needs something in writing to satisfy an investor, lender, or board. For simple, low-stakes transactions with already-agreed terms, skipping the LOI and drafting the final agreement directly is often more efficient.

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Binding vs. Non-Binding Clauses: What the Law Actually Says

This is where most confusion lives. A document labeled "Letter of Intent" is not automatically non-binding — and one labeled "non-binding" is not automatically safe. Courts look at what the language actually says, and at how the parties behaved after signing.

The landmark case: In Empro Manufacturing Co. v. Ball-Co Manufacturing, Inc., 870 F.2d 423 (7th Cir. 1989), Judge Easterbrook of the Seventh Circuit described the recurring problem directly: two companies sign a preliminary agreement, one term proves divisive, the deal collapses, and the losing party claims the LOI had standalone legal force. The court held that the LOI was not binding because the language — "subject to" a formal definitive agreement, plus a requirement for shareholder approval — made the objective intent to remain unbound clear. The lesson: use explicit language, not just the "LOI" label, to establish non-binding intent.

The Turner Broadcasting cautionary tale: In a later case, Turner Broadcasting signed an LOI with a 45-day exclusivity period for a $96 million sports team sale. After the LOI expired, Turner's CEO said "We have a deal" and his principal negotiator said "The deal is done." An appeals court found those statements — along with the LOI's language — sufficient for a jury to conclude the parties intended to be bound, even without a signed definitive agreement. Oral conduct can override a written non-binding clause.

What to label as binding vs. non-binding

Clause	Typical Treatment	Why
Confidentiality / NDA	Binding	Sensitive information is shared; protection must survive a collapsed deal
Exclusivity / no-shop	Binding	Prevents seller from marketing to competing buyers during due diligence
Governing law	Binding	Determines which court or jurisdiction resolves disputes
Dispute resolution (arbitration)	Binding	Sets the process for any disagreement during negotiations
Purchase price	Non-binding	Subject to due diligence findings
Deal structure	Non-binding	May change based on tax, liability, or regulatory considerations
Representations and warranties	Non-binding	Placeholder; final language drafted in definitive agreement
Closing conditions	Non-binding	Contingent on findings and approvals not yet completed

To avoid ambiguity, separate binding and non-binding sections under distinct headings, and add a sentence like: "This LOI is non-binding except for Sections 4 (Confidentiality), 5 (Exclusivity), and 6 (Governing Law), which the parties intend to be legally binding."

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How to Write a Letter of Intent: Step-by-Step

1. Identify the parties

State the full legal names of every party — companies with their jurisdiction of formation, individuals with their full names. Ambiguity here creates enforcement problems later.

2. State the purpose and transaction structure

Describe what the deal is: an asset purchase, a stock acquisition, a licensing arrangement, a joint venture. In M&A, specify whether it's an asset deal or a stock deal — buyers often prefer asset deals to isolate liabilities; sellers often prefer stock sales for tax reasons.

3. Outline key business terms

Cover the proposed purchase price (or range), payment structure, any earn-out or holdback provisions, and major assets or liabilities included. Keep enough specificity to align expectations without accidentally drafting a full contract.

4. Set the exclusivity period

Define a fixed end date or a milestone-based trigger. Buyers in M&A typically request 45–120 days. Sellers should negotiate the shortest period they can, and consider making exclusivity contingent on the buyer meeting due diligence milestones. If the buyer misses deadlines, they should lose exclusivity.

5. Include binding confidentiality provisions

This clause should survive even if the deal falls through. Specify what counts as confidential information, who can receive it, and how long the obligation lasts. If you've already signed a standalone NDA, the LOI can reference and incorporate it — but consider expanding its scope to cover the transaction details themselves.

6. Describe the due diligence process

Set out what documents and access the buyer will receive, who bears the cost, and what happens to information if the deal collapses. Failure to address due diligence scope in the LOI is a common source of friction later.

7. Add a clear non-binding statement

Don't rely on the document's title. Include explicit language: "Except for the provisions expressly identified as binding above, this letter does not create any legal obligation on either party to consummate the transaction." Avoid words like "shall," "agree," "accept," and "commit" in non-binding sections — use "intend," "propose," "expect," and "would" instead.

8. State governing law, costs, and termination

Specify which state's or country's law governs the LOI. Note that each party bears its own negotiation costs. Include a termination mechanism — either party should be able to end negotiations on written notice.

9. Get signatures from authorized representatives

An LOI signed by someone without authority to bind the company is enforceable against the signer personally, not the company. Check that signatory authority has been properly delegated.

For complex deals — especially M&A, joint ventures, or anything involving significant money — have a lawyer review the draft before it goes out. As Mintz's M&A team notes, sellers have the most negotiating leverage before they sign an LOI; that leverage diminishes significantly once exclusivity kicks in.

You can also generate a services agreement or draft a founders agreement through Pactlio once LOI terms are settled — or use Pactlio to build the definitive deal document with AI assistance.

For more on what makes any preliminary or final document legally enforceable, see our guide to what makes a contract legally binding. If you're heading into active negotiations, our contract negotiation guide covers practical tactics for both sides of the table.

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LOI vs. MOU: What's the Real Difference?

The terms are often used interchangeably, and in most U.S. jurisdictions their legal weight is functionally the same — it depends entirely on the language, not the label. That said, there are conventional usage differences:

Feature	Letter of Intent (LOI)	Memorandum of Understanding (MOU)
Typical initiator	One party sends it to the other	All parties sign simultaneously
Primary use	Signaling intent in a specific transaction (M&A, real estate)	Broader collaborations, research partnerships, government agreements
Detail level	Usually concise (2–5 pages); points to a future deal	Often more detailed; outlines roles and responsibilities
Legally binding?	Generally no, except specified clauses	Generally no, except specified clauses
Replaces NDA?	No — treat confidentiality as a separate or expressly binding clause	No — same rule applies

For an individual transaction between two companies — a business sale, a licensing deal, an exclusive supply arrangement — an LOI is the more common instrument. For multi-party collaborations, research alliances, or government relationships where no immediate commercial transaction is contemplated, an MOU is more typical.

If you're structuring a joint venture, you'll likely want both an LOI (to frame the deal) and eventually a full joint venture agreement. For partnerships, see when and whether a partnership agreement needs legal counsel involved from the start.

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Common Mistakes to Avoid

• Treating a "non-binding" label as a guarantee. Courts look past the label to the actual language. An LOI that reads like a contract — with "shall," "agree," and fully specified terms — may be enforceable regardless of what you called it.
• Leaving binding and non-binding clauses mixed together. The binding sections (confidentiality, exclusivity, governing law) and non-binding sections (price, structure, conditions) should be in separate, clearly labeled parts of the document.
• Signing an overly long exclusivity period. Sellers who grant 120-day exclusivity without milestone requirements can find themselves locked out of the market while a buyer drags out due diligence. Tie exclusivity to a buyer's obligation to deliver specific materials on a schedule.
• Using contract-language words in non-binding sections. "The parties agree to a purchase price of $X" can be read as a binding commitment. Write "The parties propose a purchase price of approximately $X, subject to completion of due diligence."
• Skipping confidentiality protections. Without a binding confidentiality clause, sensitive financial data, customer lists, and IP exposed during negotiations has no legal protection if the deal falls through.
• Treating the LOI as a casual first step. In practice, the deal almost always closes on the terms set in the LOI. Walking back on purchase price or deal structure after signing creates distrust and often kills the deal. Negotiate the LOI carefully — it's where your leverage is highest.

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Sources

• Empro Manufacturing Co. v. Ball-Co Manufacturing, Inc., 870 F.2d 423 (7th Cir. 1989): https://law.justia.com/cases/federal/appellate-courts/F2/870/423/312199/
• Wiley Law, "Purposes and Pitfalls of Letters of Intent" (Turner Broadcasting case discussion): https://www.wiley.law/newsletter-4160
• Morgan & Westfield, "M&A Basics: The Letter of Intent": https://morganandwestfield.com/knowledge/letter-of-intent/
• Harter Secrest & Emery LLP, "Is Your Non-Binding Letter of Intent Actually Binding?": https://hselaw.com/news-and-information/in-the-news/is-your-non-binding-letter-of-intent-actually-binding/
• Mintz M&A, "Seller Considerations When Negotiating a Letter of Intent": https://www.mintz.com/insights-center/viewpoints/2871/2025-03-31-seller-considerations-when-negotiating-letter-intent
• Corporate Finance Institute, "Letter of Intent (LOI) Template: All Key Terms Included": https://corporatefinanceinstitute.com/resources/valuation/letter-of-intent-loi-template/
• Playbook Advisory, "Letter of Intent for Business Acquisition — Best Practices in 2025": https://www.playbookadvisory.com/business-broker-blog/letter-of-intent-business-acquisition-best-practices-2025
• Aaron Hall (Attorney), "Letter of Intent Terms That Trigger Binding Obligations": https://aaronhall.com/letter-of-intent-terms-trigger-binding-obligations/
• Angel Law Offices, "5 Steps to Keep Your Letter of Intent Non-Binding": https://www.angellawoffices.com/negotiating-letters-intent/
• Reinhart Law, "Ten Mistakes to Avoid in Letters of Intent": https://www.reinhartlaw.com/news-insights/ten-mistakes-avoid-letters-intent

This article is general information, not legal advice. Laws vary by jurisdiction. Pactlio generates professional drafts for review — have a licensed attorney review anything important.