What Is a Letter of Intent (LOI), and How Is It Different From a Contract?

A Letter of Intent (LOI) is a document outlining the key terms of a proposed deal that both sides genuinely intend to formalize into a full agreement later — a structured way of saying "we're serious about this deal, here's roughly what we've agreed on so far" before either side commits to the binding, fully-negotiated terms of an actual contract.

What an LOI is actually for

Deals that involve real complexity — an acquisition, a significant partnership, a commercial lease, a major supply agreement — often can't jump straight from a first conversation to a signed contract. There's real value in first getting the *key* terms (price, scope, timeline, major conditions) agreed on paper, before either side invests the time and legal cost of drafting and negotiating every clause of a full contract. An LOI captures that middle step: a documented, mutual understanding of the deal's shape, signaling genuine intent to proceed, without yet locking in every legal detail a final contract will eventually cover.

The single most important thing to understand: binding vs non-binding sections

This is the concept that matters more than anything else about an LOI, and it's also the most commonly misunderstood: a well-drafted LOI is explicitly a mix of binding and non-binding provisions, clearly labeled as such — it is not simply "a less formal contract" that's entirely non-binding, nor is it "basically a contract" that's entirely binding. Reading an LOI without checking which specific sections are marked binding is the single most common, and most consequential, mistake made with this type of document.

What's typically non-binding

• The core deal terms themselves — price, valuation, ownership percentage, scope of the transaction — are usually explicitly non-binding, meaning either party can still walk away or renegotiate these specifics before a final contract is signed.
• Any timeline or closing-date estimate — stated as a target, not a binding commitment, since the actual final agreement's terms haven't been locked yet.

What's typically binding, even in an otherwise non-binding LOI

• Confidentiality — obligations to keep the discussions and any shared information confidential are almost always binding immediately, functioning much like a standalone NDA for the duration of the negotiation.
• Exclusivity (a "no-shop" clause) — a commitment that one party won't simultaneously negotiate a similar deal with someone else for a defined period, which is genuinely binding and enforceable, and matters a great deal in competitive deal situations (a company being courted by multiple potential acquirers, for instance).
• Governing law and dispute resolution — which jurisdiction's law applies and how disputes about the LOI itself get resolved, typically binding from signing.
• Expense allocation — who pays for what if the deal falls through (due diligence costs, legal fees incurred so far), often binding to avoid a dispute over sunk costs if the deal doesn't close.
• A defined expiration date — after which the LOI (and any exclusivity it granted) automatically lapses if a final agreement hasn't been signed, genuinely binding as a deadline mechanism.

Why the non-binding core terms still matter enormously

Even though the price and scope in an LOI are typically non-binding in the strict legal sense, walking away from them without a genuinely good reason carries real, practical cost — reputational damage in a small industry, wasted legal and due-diligence expense on both sides, and the loss of trust that made the deal move this far in the first place. "Non-binding" describes the legal enforceability, not the practical seriousness — a party that treats an LOI's core terms as a costless, throwaway starting position, renegotiated aggressively downward once the other side has already invested significant time and cost, is engaging in exactly the kind of bad-faith behavior that damages a reputation well beyond this one deal.

What happens after an LOI is signed

Signing an LOI isn't the end of a negotiation — it's usually the start of the most intensive phase. The period immediately following typically involves due diligence (the buyer or partner verifying the financial, legal, and operational claims underlying the deal), continued negotiation of the specific terms the LOI left open or marked non-binding, and drafting of the actual, full contract by each side's legal counsel. A well-structured LOI makes this phase more efficient precisely because the big, potentially deal-breaking questions (price range, structure, exclusivity) were already worked through before either side invested in the more expensive, detailed work of due diligence and full contract drafting — the LOI's real value is front-loading the highest-level disagreements to before the expensive part of the process, not after it.

LOI vs Memorandum of Understanding (MOU) — is there a real difference?

In practice, the terms LOI and MOU are often used close to interchangeably, and there's no single universal legal distinction that always separates them — usage varies by industry, region, and the specific parties involved. If there's a general tendency, it's that an LOI more often appears in a one-directional context (one party expressing intent toward another, common in M&A and real estate) while an MOU more often implies a mutual, multi-party understanding (common in partnerships and government/institutional agreements) — but this isn't a strict rule, and the specific document's own content (its binding/non-binding structure, what it actually covers) matters far more than which of the two labels sits at the top of the page.

LOI vs a full contract: the real differences

• Level of detail: an LOI covers key terms at a summary level; a contract spells out every operative clause, warranty, condition, and remedy in full, enforceable detail.
• Enforceability: an LOI is mostly non-binding on the core deal terms by design; a contract is fully binding on everything it contains once properly executed.
• Purpose: an LOI signals serious intent and locks in the deal's shape before deeper investment in due diligence and legal drafting; a contract is the actual, final, legally operative agreement.
• Typical next step after signing: an LOI is followed by due diligence and full contract negotiation; a signed contract is followed by actual performance of the deal's obligations.

When an LOI is genuinely worth using

• Before a business acquisition or merger, to lock in the core valuation and structure before both sides invest in expensive due diligence and legal drafting.
• Before a significant commercial lease or real estate transaction, to confirm key terms (rent, term length, key conditions) before detailed lease drafting begins.
• Before a major partnership or joint venture, to document the intended structure and each party's role before drafting the full partnership agreement.
• When exclusivity matters, since the binding no-shop clause genuinely protects the time and cost both sides are about to invest in moving the deal forward.

What a well-drafted LOI typically includes, section by section

• Parties and background — who's involved and a brief statement of the deal's purpose, setting context for everything that follows.
• Key commercial terms — price, valuation, ownership structure, or the core scope of what's being exchanged, clearly labeled as non-binding and subject to final agreement.
• Conditions precedent — what has to happen before the deal can actually close (financing secured, regulatory approval obtained, due diligence completed to satisfaction), which shapes the realistic timeline.
• Exclusivity/no-shop period — how long, and under what specific terms, one party commits not to pursue a competing deal.
• Confidentiality — obligations covering information exchanged during the negotiation, often referencing or standing in for a full separate NDA.
• Expenses — who bears due diligence, legal, and advisory costs, and specifically what happens to those costs if the deal ultimately doesn't close.
• Governing law and expiration — which jurisdiction's law governs the LOI itself, and the date after which it lapses if a full agreement hasn't been signed.

A realistic example, worked through

A software company negotiating to be acquired by a larger competitor signs an LOI setting out a preliminary valuation, the general deal structure (cash plus a smaller stock component), and a 60-day exclusivity period during which the target company agrees not to entertain other acquisition offers. The valuation and deal structure are explicitly marked non-binding — either side can still walk away or push for different terms once full due diligence uncovers something material. The exclusivity clause, confidentiality obligations, and a clause specifying that each side bears its own legal costs regardless of outcome, are all explicitly binding from the moment of signing. Over the following weeks, the acquirer's team conducts due diligence; if everything holds up as expected, the LOI's preliminary terms become the starting point for drafting the full, binding acquisition agreement. If diligence uncovers something significant, either side can renegotiate the non-binding terms — or walk away entirely — without breaching the LOI itself, since only the specifically-labeled binding provisions carry that obligation.

Negotiating an LOI: what actually matters most

Since the core commercial terms are typically non-binding anyway, the negotiation energy that actually matters most in an LOI often isn't the headline number — it's the binding provisions and the conditions precedent, since those are what genuinely constrain each side's options going forward. A party asked to sign a long exclusivity period, for instance, is giving up the real ability to explore other options for that entire window — worth negotiating down if the deal's likelihood of closing is genuinely uncertain, since a long no-shop period with a low probability of the deal actually completing is a real, meaningful cost, not a formality.

LOIs in fundraising: a specific, common variant

In startup fundraising, the LOI's rough equivalent is usually called a term sheet — a document outlining the proposed investment amount, valuation, ownership percentage, and key investor rights (board seats, liquidation preferences, anti-dilution provisions), with the same fundamental binding/non-binding split: the specific financial terms are typically non-binding pending full legal documentation, while confidentiality and exclusivity (sometimes called a "no-shop" period preventing the company from soliciting other investors while this deal is being finalized) are binding. Founders navigating a term sheet for the first time benefit from the exact same reading discipline as any other LOI: identify precisely which clauses actually bind you before treating the whole document as either "just a formality" or "basically a done deal" — neither framing is accurate.

When it's probably unnecessary overhead

For a simpler, lower-stakes engagement — a standard freelance project, a routine vendor purchase, a small services contract — going straight to a proposal and then a contract, without an intermediate LOI stage, is usually the more efficient path. An LOI earns its place specifically when a deal is complex or high-value enough that locking in the shape of the agreement before investing in full legal drafting and due diligence provides real, proportionate value — for a routine transaction, it's an extra step that adds process without adding much real protection.

The short version: an LOI documents serious intent and the key shape of a proposed deal, mixing genuinely binding provisions (confidentiality, exclusivity, expense allocation, expiration) with deliberately non-binding core terms (price, scope) still open to final negotiation. Read every LOI carefully to know exactly which sections actually bind you — that distinction, not the document's informal tone, is what determines what you're really agreeing to.

For anything beyond a routine, low-stakes deal, having a lawyer review the specific binding provisions before signing is worth the modest cost — the standard structure described here is a reliable general pattern, but the exact wording of what's binding versus non-binding in any given LOI is a matter of that specific document's drafting, not a universal guarantee, and a lawyer's five-minute read before signing is far cheaper than discovering after the fact that a clause you assumed was a formality was actually enforceable.

Treat the time spent getting an LOI right as an investment in the deal actually closing smoothly, rather than a bureaucratic delay before the real work starts — the clarity it creates about what's genuinely agreed versus what's still open is exactly what prevents the far more expensive kind of disagreement that surfaces midway through due diligence instead.

Whichever side of a deal you're on, the same habit applies: read the whole document, ask directly which specific clauses are binding if it isn't stated plainly, and negotiate the binding provisions with the same seriousness as a final contract — because, for those specific clauses, that's exactly what it already is.