A letter of intent (LoI) is one of the first formal documents in an M&A deal process. It comes up after a buyer and seller have had promising early-stage discussions but nothing is on paper yet. At that point, both parties need a way to move forward together, and the M&A letter of intent provides exactly that by outlining the proposed key deal terms.
Read on to understand what goes into an LoI in M&A, whether it's legally binding, and what comes next in the deal process.
A Letter of Intent (LoI) for business acquisition is a preliminary, written agreement between a buyer and a seller that outlines the primary terms and structure of a proposed transaction. It’s more like a formal, detailed offer that opens the door for the buy-side M&A team to start the due diligence process while also keeping deal terms from drifting before the final definitive purchase agreement.
In most M&A transactions, the buyer initially drafts and presents the LoI to the sell-side M&A team. They use it to say, "Here is exactly how much we are willing to pay for your company, how we plan to structure the payment, what we need to verify, and how long we need to do it." The seller reviews it, pushes back on unfavourable terms, and both sides negotiate to reach a version they're comfortable signing.
In other scenarios, the seller’s advisors might provide a standardized LoI template and require all interested buyers to submit their bids using that exact template to make it easier to compare offers side-by-side.
As mentioned above, the main purpose of an M&A letter of intent is to outline the deal structure, and what’s included reflects that. The exact contents vary by deal size, industry, and the preferences of the parties involved. But here are the key components of a LoI for business acquisition:
An LoI is mostly non-binding, but not entirely. The core commercial terms, like the price, structure, and timeline, are generally non-binding. Either party can walk away if negotiations break down or if due diligence reveals something unexpected.
However, certain clauses within the M&A letter of intent are generally binding. These include confidentiality / non-disclosure obligations, which carry legal weight. Exclusivity provisions that prevent the seller from shopping the deal to other buyers during a defined window are usually enforceable too. So is any agreed cost-sharing or breakup fee arrangement.
Generally, a Letter of Intent (LoI) comes mid-stage / pre-due diligence in the M&A process. Once signed, it acts as a bridge from informal interest to a more formal commitment. A buyer won’t spend significant resources on due diligence, and a seller won’t share sensitive information, without it.
Below is an overview of the typical stages of an M&A transaction and where the LoI sits.
The seller gets their financial records in order and prepares marketing materials, like a Confidential Information Memorandum (CIM).
Once materials are ready, the seller's business is marketed to potential buyers. Interested buyers submit a loose, non-binding Indication of Interest (IOI) suggesting a rough valuation range to see if they can even get in the game.
After reviewing the IOIs, the seller selects the best candidate(s) for deeper discussions. The buyer then submits the formal letter of intent. Once both parties negotiate the terms and sign it, the deal officially enters the exclusive zone.
Up until this signature, the seller could talk to anyone. But the seller's hands are tied by the LoI exclusivity period clause, also known as a "no-shop" clause, once signed, and the buyer's clock starts ticking.
The signed letter of intent allows the buyer and their team of accountants and lawyers to conduct due diligence by accessing the seller's data room. They verify every information they need like tax return, customer contract, and employee record to make sure the business is exactly as advertised.
If due diligence checks out, the lawyers from both sides draft the final Definitive Purchase Agreement. This binds both parties legally, money changes hands, and the deal is officially closed. The LoI is now superseded by the final contract.
If you’re wondering how to write an M&A letter of intent, the key is ensuring you include all the major components we listed earlier. Ideally, the LoI should be drafted or reviewed by a lawyer with M&A experience. But here’s how to structure those elements effectively:
The LoI should start with a formal business formatting of the date and address. Then open by clearly identifying the buyer and the seller, naming the target business, and stating plainly that this document represents the parties' intent to explore a transaction on the terms that follow.
The next step is to state what the buyer is willing to pay and how they are going to do so. Begin with the total purchase price. Then break down the proposed deal structure (asset vs. stock) and any payment mechanisms, such as upfront cash, deferred consideration, or earnout.
This is where you tell the seller what the buyer wants to look at and how long they need to do it. State that the offer is contingent on a satisfactory review of their financial, legal, and operational records. Then give a reasonable timeframe, typically 30 to 90 days, to complete this investigation.
Include a paragraph that explicitly mentions which provisions are intended to be legally enforceable and which are not. For instance:
Add a LoI exclusivity period clause. Explicitly state that for a period of X days (normally 30 to 90 days), the seller cannot solicit, negotiate, or accept offers from other potential buyers. Be specific with the period and seller prohibitions.
If a separate NDA isn't already in place, add confidentiality agreement terms in the LoI. These establish the obligations of both parties to protect sensitive information shared during the process.
If you send an LoI, give the seller a timeline to accept it. Otherwise you may invite delays if no expiry date is set.
In a standard M&A transaction, the letter of intent is signed by authorized representatives from both the sell side and buy side teams. For the buyer, that’s either the individual or an executive signing on behalf of the acquiring company. For the seller it’s the business owner or an officer representing the company being sold.
If the business has multiple owners, buyers will often insist that all major shareholders or partners sign, or at least provide written consent, to ensure a minority owner cannot swoop in later and tank the deal. Third parties like brokers, lawyers, and M&A advisors do not sign the LoI, as they are not legal parties to the actual sale.
Like any deal tool, a letter of intent comes with genuine benefits and real limitations to both parties. Below is a quick overview.
Pros of a LoI for the Seller
| Cons of a LoI for the Seller |
| Vets whether a buyer is serious or worth the time | Prevents the seller from entertaining other offers |
| Gets a written record of agreed-upon terms before spending money | Buyers can use due diligence to aggressively grind the price down |
| Reveals major deal-breakers or disagreements on price or structure early | Can make inexperienced sellers feel the deal is already done
|
| Builds deal momentum as the buyer commits to moving forward | High risk of lost time and money if the transaction collapses |
| Pros of a LoI for the Buyer | Cons of a LoI for the Buyer |
| Secures exclusivity, protecting the buyer from being outbid during investigation | The seller can still walk away before the final agreement as its not a legal guarantee |
| Establishes a clear timeline and expectations for due diligence | Vague or inconsistent LoI language creates massive friction later |
| Identifies major financial or operational flaws early | High risk of lost accounting and legal fees if the deal fails |
| Speeds up final contracts by giving lawyers a solid framework to draft the definitive agreement |
A Letter of Intent is a written document that outlines the terms of a deal including purchase price, payment structure, due diligence requirements, exclusivity and confidentiality clauses, and closing conditions. It gets buyers and sellers on the same page before either party commits significant time, money, and energy to the full deal process. Used well, it allows for negotiations, reduces misunderstanding, sets clear expectations, and creates a structured path toward closing.
An M&A letter of intent is generally not legally binding regarding the actual sale of the business. However, certain clauses, specifically confidentiality, exclusivity, responsibility for transaction expenses, and governing law, are fully legally binding on both parties.
