What Does LOI Mean in Business and Is It Binding?

In business, LOI stands for letter of intent, a preliminary document that sets out the main terms of a proposed deal before the parties sign a final contract. Most of what it says is non-binding — a good-faith sketch of where the parties expect to end up — but specific protective clauses inside it, usually confidentiality and exclusivity, are enforceable from the moment you sign. That split is the reason an LOI deserves careful reading: you can walk away from the deal itself, but not from every promise in the document.

What a Letter of Intent Actually Contains

An LOI opens by naming the parties with their full legal names and entity types, so any obligations attach to the correct people or companies. It then lays out the proposed purchase price, which may be a fixed dollar amount or a formula tied to a financial metric such as a multiple of earnings. The structure of the deal appears next: whether the buyer is acquiring stock, buying specific assets, or merging the two entities. That choice carries major tax consequences for both sides, which is why it is one of the first points negotiated.

Beyond price and structure, a typical LOI covers:

The assets or equity being transferred — specific inventory, intellectual property, real property, or a percentage of outstanding shares.
The payment method — cash, stock, a combination, or installments, and how the funds will be delivered at closing.
A target closing date and deadlines for milestones such as finishing due diligence or securing financing.
Conditions that must be satisfied before closing, such as regulatory approvals, board votes, or acceptable inspection results.

A letter of intent filed with the SEC for a commercial real estate acquisition, for example, identified the buyer, seller, property address, financing terms, inspection deadlines, and closing conditions, all before a formal purchase contract was drafted.¹

Which Parts of an LOI Are Binding

A well-drafted LOI sorts its provisions into two labeled categories: non-binding and binding.

The non-binding section holds the core commercial terms — purchase price, deal structure, closing timeline, and similar points. These reflect where the parties expect to land, but they do not force anyone to close. If negotiations stall or due diligence turns up problems, either side can walk away without liability for the deal itself.

The binding section protects both parties during the window between signing the LOI and either closing or abandoning the transaction. The clauses that typically carry legal weight include:

Confidentiality. Both sides agree not to share sensitive business information they learn during the process. A breach can lead to a lawsuit for damages or a court order halting further disclosure.
Exclusivity, often called a no-shop clause. The seller agrees not to negotiate with other potential buyers for a set period, often 30 to 60 days, giving the buyer room to complete due diligence without competing bids.
Expense allocation. Each party usually bears its own legal, consulting, and due diligence costs unless the final contract shifts that burden.
Governing law. The LOI specifies which state’s laws apply if a dispute arises over the document itself.

The SEC commercial real estate LOI referenced above illustrated this split: the non-binding section stated that neither party had any legal obligation until a formal purchase contract was signed, while the binding section created an enforceable exclusivity agreement preventing the seller from negotiating with anyone else.¹

How an LOI Can Become Binding by Accident

Even when the parties intend an LOI to stay non-binding, loose drafting can create enforceable obligations. Courts look past the label on the document and focus on the actual language. If the terms are specific enough, and the parties behaved as though they had a deal, a court may conclude that a binding contract already exists.

The best-known example is Texaco, Inc. v. Pennzoil Co. A Texas jury found that Getty Oil and Pennzoil had formed a binding agreement based on a preliminary memorandum, even though no final contract had been signed. Texaco, which later acquired Getty Oil, was found liable for interfering with that agreement. The Texas Court of Appeals upheld the finding, and when Texaco took the case to the U.S. Supreme Court, the Court declined to disturb the state court’s ruling on the merits. The lesson: if a preliminary document reads like a done deal, a court may treat it as one.

A few drafting choices raise the risk of accidental binding:

Good faith or best efforts language. Phrases requiring “best efforts” or “good faith” to finalize a definitive agreement can be read as a promise to reach a deal rather than a promise to try. Some courts have held that this creates a duty to negotiate fairly, and a party that walks away without a legitimate reason can be liable for the other side’s costs.
Overly specific terms. The more detailed the commercial terms — price, closing date, representations — the easier it becomes for a court to treat those terms as a final agreement rather than a framework for continued negotiation.
Missing disclaimer language. Without a clear statement that the non-binding provisions do not create enforceable obligations, a court has more room to find a binding commitment.

Courts in some jurisdictions also recognize what are called Type II preliminary agreements, where the parties have agreed on the major terms and committed to negotiate in good faith toward a final contract. Under that framework, a party that refuses to negotiate or introduces unreasonable new demands can be held liable for the other side’s lost profits. The safer path is to label each provision as binding or non-binding and to avoid open-ended promises to reach a final deal.

Where You’ll See LOIs Used

LOIs appear in many kinds of transactions, but three settings account for most of them.

Mergers and Acquisitions

In an M&A deal, the LOI gives both sides a stable reference point while shareholders, board members, and advisors evaluate a potential change of ownership. The document typically identifies whether the transaction will be structured as a stock purchase, asset purchase, or merger. That choice significantly affects the tax position of both buyer and seller, so it is addressed early.

Commercial Real Estate

A real estate LOI lets a buyer lock in a property while arranging financing, running environmental inspections, and completing appraisals. The exclusivity clause matters especially here, because those steps cost real money. If the seller could accept a competing offer during the inspection period, the buyer would risk spending thousands on site surveys and reports with nothing to show for it.¹

Joint Ventures

When two businesses plan to combine resources for a specific project or market, an LOI establishes the scope of the partnership, each party’s contributions, and the basic framework for management and profit sharing. Documenting those points early helps both sides confirm they share the same vision before paying for detailed legal agreements.

What Happens After You Sign

Signing is the beginning of the process, not the end. A few significant steps follow.

Due Diligence

The buyer’s legal and financial teams conduct an intensive review of the target company’s records: tax returns, contracts, employee agreements, outstanding debts, litigation history, and regulatory compliance. The review typically runs 30 to 90 days. The buyer generally pays its own due diligence costs, including fees for environmental inspections, appraisals, and outside consultants. If the review turns up problems — undisclosed liabilities, inflated revenue figures, pending lawsuits — the buyer can renegotiate the price, demand protections in the final contract, or walk away under the non-binding terms.

Definitive Agreement

If due diligence goes well, the lawyers convert the LOI’s broad terms into a detailed purchase agreement. That final contract contains specific representations and warranties from both sides, indemnification provisions that allocate risk if those representations prove wrong, and precise closing conditions. Once signed, the definitive agreement replaces the LOI and becomes the enforceable document governing the transaction.

Regulatory Filings for Larger Deals

Certain transactions trigger mandatory government filings that the LOI itself does not address but that the parties must plan for. For acquisitions where the buyer would hold more than $133.9 million in the target’s voting securities or assets (the 2026 adjusted threshold), the Hart-Scott-Rodino Act requires both parties to file a pre-merger notification with the Federal Trade Commission and wait for clearance before closing.² The filing obligation exists regardless of what the LOI says, and the statute imposes significant daily civil penalties for closing without proper notification.³

If either party is a publicly traded company, the SEC may require a Form 8-K filing within four business days of entering into a material definitive agreement. A non-binding LOI generally does not trigger that requirement, but a binding agreement or a definitive purchase agreement does.⁴

LOI vs. Memorandum of Understanding

You may hear “letter of intent” and “memorandum of understanding” (MOU) used as if they were the same thing. In practice, an LOI tends to be more formal and shows up most often where a specific purchase is being negotiated — acquisitions, real estate deals, and investment rounds. An MOU is more common in earlier-stage or collaborative arrangements, such as a potential partnership or a joint research project, where the parties are still defining the relationship rather than negotiating a price. Both can contain binding and non-binding provisions, so the label on the document does not decide enforceability. What matters is the language inside and whether the parties clearly identified which obligations they intended to be legally binding.

1
SEC. Exhibit 2.1 Letter of Intent to Purchase Commercial Real Estate
2
FTC. New HSR Thresholds and Filing Fees for 2026
3
Office of the Law Revision Counsel. 15 U.S. Code 18a – Premerger Notification and Waiting Period
4
SEC. Form 8-K Current Report