Every business acquisition starts with a Letter of Intent (LOI) and a purchase agreement. A letter of intent opens the deal, and a purchase agreement closes it. Buyers who treat the letter of intent as a harmless formality can end up bound to terms they meant to leave open or unprotected on terms they meant to secure.
The LOI vs purchase agreement distinction is worth understanding in plain terms: what each document is, what each one does, which parts actually bind the parties, and where each belongs in a deal.
What is a Letter of Intent (LOI)?
A letter of intent is the document that turns a conversation into a plan. It records what a buyer and seller have agreed in principle, the price, the structure, and the broad terms, before either side commits time and money to a full contract.
Most of it reads as a roadmap rather than a binding promise, which is exactly why the parties sign one early. A letter of intent is generally not binding on the core deal terms, though a handful of clauses in it create real legal obligations.
What an LOI Typically Covers
The letter of intent sketches the shape of the deal without filling in every line. A typical version runs one to two pages and sets out the business terms both sides expect the final contract to reflect.
Common contents include:
- The proposed purchase price and how it will be paid
- Whether the deal is structured as an asset or stock purchase
- Key conditions such as financing, due diligence, and required approvals
- An exclusivity period and a target timeline to closing
- Confidentiality terms covering information shared during review
None of these figures are final; instead, they set expectations that the purchase agreement will later confirm, adjust, or replace once due diligence is complete.
Which Provisions Remain Binding Even When the LOI Is Non-Binding
A non-binding label does not cover the entire document. Even when the deal terms stay open, certain provisions are written to bind both sides the moment they sign. The parts that usually have legal effect include:
- Confidentiality, which protects sensitive information exchanged during diligence
- Exclusivity or no-shop terms, which stop the seller from approaching other buyers
- Governing law, which fixes the state whose rules apply to any dispute
- Allocation of expenses, which sets who pays for what if the deal ends
A buyer who signs without noticing these clauses can be held to them in court. Reading the binding sections as carefully as the deal terms saves a buyer from surprise obligations later.
What Is a Purchase Agreement?
The purchase agreement is the contract that actually transfers the business. Where the letter of intent describes intentions, the purchase agreement creates obligations, spelling out every term the parties are legally bound to honor at closing.
The purchase agreement is long, detailed, and negotiated line by line because once signed, it governs who gets what, who owes what, and what happens if something goes wrong. This is where the broad terms in the letter of intent become detailed legal obligations.
Asset Purchase Agreement vs. Stock Purchase Agreement
Two structures dominate private acquisitions, and the choice shapes the entire contract. In an asset purchase, the buyer picks up specific assets and liabilities and leaves the rest with the seller’s entity. In a stock purchase, the buyer acquires the ownership shares and takes the company whole, its history and obligations included.
Buyers often prefer asset deals because they can leave unwanted liabilities behind and reset the tax basis of what they buy. Sellers frequently prefer stock deals for cleaner exits and often better tax treatment. The structure chosen drives how the purchase agreement handles liabilities, consents, and taxes.
Core Sections Every Purchase Agreement Contains
Purchase agreements follow a recognized structure, even as the specifics vary by deal. A buyer reviewing one will find a familiar set of building blocks:
- Purchase price and payment terms, including any adjustments at closing
- Representations and warranties, the factual statements each side makes about itself and the business
- Covenants, the promises about conduct before and after closing
- Closing conditions are the events that must occur before the deal completes
- Indemnification, the rules for who covers losses if a representation proves false
- Termination rights, the circumstances under which either side can exit
Each section of the agreement carries weight, but it is worth noting that the representations and indemnification provisions in particular decide how risk is shared once the business changes hands.
4 Key Differences Between an LOI and a Purchase Agreement
The two documents differ in almost every dimension that matters to a buyer. One is short and mostly non-binding, the other is long and fully enforceable. One opens the deal, the other closes it.
Four differences capture the distinction most clearly.
1. Binding Nature and Enforceability
This is the difference buyers most often misjudge. A properly drafted letter of intent binds the parties only on a few named clauses, while the rest stays open.
A purchase agreement binds the parties on every term it contains. Sign the purchase agreement, and the obligation to close is real, subject only to the conditions written into the contract.
2. Length and Level of Detail
A letter of intent stays short on purpose, usually one to two pages, outlining the deal at a high level. A purchase agreement runs far longer, often dozens of pages, with schedules and exhibits attached.
The jump in length reflects a jump in precision, since the final contract has to define terms the letter of intent could leave comfortably vague.
3. Where Each Sits in the Deal Timeline
The two documents mark different moments in the same process. A buyer signs the letter of intent near the start, once the parties agree on the broad shape of the deal and before serious diligence begins.
The purchase agreement comes at the end of that work, after diligence, financing, and negotiation have settled the details. Weeks or months usually separate the two signatures.
4. Who Drafts Each Document
The buyer usually prepares the letter of intent, since the buyer is proposing the terms and setting the pace. The purchase agreement is typically drafted by the buyer’s counsel as well, then negotiated hard by the seller’s lawyers, who mark up representations, indemnities, and conditions until both sides can live with the language.
LOI vs. Purchase Agreement: Table Overview
Here is a quick look at major differences between an LOI and a purchase agreement
| Feature | Letter of Intent | Purchase Agreement |
| Binding nature | Mostly non-binding, except select clauses | Fully binding on all terms |
| Length | One to two pages | Often dozens of pages with schedules |
| Timeline | Signed early, before diligence | Signed at the end, before closing |
| Primary purpose | Set expectations and secure exclusivity | Transfer the business and allocate risk |
| Who drafts it | Usually, the buyer’s counsel or broker | Buyer’s counsel, negotiated by the seller |
| Level of detail | High-level terms | Precise and comprehensive terms |
When Buyers Use an LOI vs. Going Straight to a Purchase Agreement
Not every deal needs a letter of intent, and part of a buyer’s judgment is knowing when one earns its place. Larger and more complex transactions almost always begin with one, since the parties want alignment on price and structure before committing resources to diligence and drafting.
The letter also locks in exclusivity, which matters more when a deal is competitive.
The regulatory scale can also determine if an LOI is needed. Deals above the federal reporting line, which the FTC set at $133.9 million for 2026, require the parties to notify antitrust regulators and wait before closing. This lengthens the timeline and makes an early written understanding more useful.
Smaller Main Street transactions often skip the letter entirely. When the deal is straightforward and both sides are ready to move, going straight to a purchase agreement can save weeks. The tradeoff is exposure, since a buyer then funds diligence with no exclusivity and no written agreement on the basic terms.
Negotiating Points to Settle Before Signing Either
Both documents are negotiated line by line rather than signed as first drafted, and a buyer who understands the leverage points enters each stage in a stronger position. Some of these terms are in the letter of intent, others in the purchase agreement, and a few deserve attention in both.
Exclusivity and No-Shop Provisions in the LOI
Exclusivity is often the main thing a buyer gains from a letter of intent. A no-shop clause bars the seller from negotiating with other buyers for a set window, usually thirty to sixty days. This protects the money a buyer is about to spend on diligence.
Buyers push for a longer window, while sellers try to keep it short and add conditions that end it early.
Due Diligence Rights and Timelines
A letter of intent sets the terms of the buyer’s investigation before the real work starts. It defines how long the buyer has to examine the books, contracts, and operations, and what access the seller agrees to provide.
A buyer benefits from a diligence window long enough to be thorough, along with clear language requiring the seller to hand over records promptly. Vague access terms tend to become friction once diligence is underway.
Indemnification Caps, Baskets, and Survival Periods in the Purchase Agreement
Indemnification decides how the parties handle losses that surface after closing, and its mechanics are heavily negotiated. A basket sets the minimum amount of losses that must build up before the seller has to pay, so minor claims do not trigger indemnity.
A cap sets the ceiling on the seller’s total responsibility, while survival periods fix how long each representation stays open to a claim.
Buyers press for a low basket, a high cap, and long survival on the representations that matter most, while sellers push the other way.
Walk-Away Rights and Termination Provisions
Every buyer wants a clear path out if problems appear before closing. In the letter of intent, that means a defined expiration date and the freedom to leave if diligence turns up trouble.
In the purchase agreement, termination rights spell out the specific conditions, missed deadlines, or failed closing conditions that let either side walk away without penalty. Knowing these exits in advance keeps a buyer from feeling trapped in a deal that no longer makes sense.
What Happens Between Signing the LOI and Signing the Purchase Agreement
The gap between the two signatures is where the deal is actually built. This interim period commonly runs thirty to ninety days, though complex or regulated deals take longer. Several things happen during this window:
- The buyer runs full due diligence on the financials, contracts, legal history, and operations
- The buyer secures financing and confirms the terms of any acquisition loan
- Both sides negotiate and draft the definitive purchase agreement
- The parties obtain third-party consents and any required regulatory clearances
Deals fall through in this window for familiar reasons. Diligence uncovers a problem serious enough to change the price or end the deal, financing falls through, or the parties simply cannot agree on final terms.
A well-written letter of intent does not guarantee a closing, though it does give both sides a shared starting point when the negotiation gets difficult.
Get the Right Document at the Right Stage of the Deal
The letter of intent and the purchase agreement do different jobs, and treating them as interchangeable is how buyers get hurt. One frames the deal and protects the early stage, and the other transfers the business and allocates the risk.
Business buyers who want experienced counsel drafting and negotiating either document can reach the M&A team at Legal Dealmakers by calling 844-332-5657 or through the contact page and get each document right at the stage where it counts.
