An agreement in principle is a preliminary document that sets out the main terms of a future deal, and in most cases it is not legally binding. It records what both sides are aiming for so that lawyers, lenders, or negotiators have a shared starting point when they draft the real contract. The catch is that certain clauses inside the document, certain behavior after signing, and the absence of a few protective words can turn parts of it into obligations a court will enforce.
What an Agreement in Principle Is For
The purpose is to set direction before anyone spends serious money. The document spells out the broad strokes: what’s being bought or sold, the approximate price, the rough timeline, and any major conditions each side wants met before closing. Both parties can point to it during later negotiations without claiming it is the final word.
It does not replace a final contract. It gives the people drafting that contract a framework so they aren’t starting from scratch, and it flags early whether the parties were ever close enough to make the deal worth pursuing.
Is an Agreement in Principle Legally Binding?
Usually no. A standard agreement in principle is drafted to be non-binding. It signals interest, not commitment. For a contract to be enforceable, it needs a clear offer, acceptance, something of value exchanged, legal capacity, and a mutual intention to be bound. Most preliminary agreements deliberately leave out that last ingredient.
The phrase “subject to contract” does a lot of the work. When a preliminary document includes those words, courts consistently read them to mean nothing is final until a formal contract is signed. Without that language, things get murkier. Courts then look at how specific the terms are, whether either party started performing, and whether the document reads more like a done deal than a wish list.
When a “Non-Binding” Agreement Becomes Enforceable
This is where people get caught. Labeling a document “non-binding” does not guarantee a court will treat it that way. Several doctrines can convert a preliminary agreement into something enforceable.
The Document Already Contains Every Essential Term
If the agreement specifies the price, the subject matter, the timeline, and each party’s obligations with enough detail that nothing material is left to negotiate, a court may conclude the parties already made a deal and simply hadn’t formalized it. One New York appellate court enforced a letter of intent because its plain language showed the parties intended to be bound, it contained no reservation allowing either side to walk away before a formal agreement was signed, and it set out the price, scope of work, and timeline with sufficient specificity.
Promissory Estoppel
Even without a binding contract, you can be held liable if you make a promise that reasonably causes the other side to take action and then you pull the rug out. Under promissory estoppel, a promise is enforceable when the person making it should have expected it to trigger reliance, it actually did trigger reliance, and enforcing the promise is the only way to avoid injustice. A property owner signs a preliminary agreement with a prospective tenant, the tenant starts construction and buys materials based on the deal, and the owner then cancels to accept a better offer. The owner may owe damages for the tenant’s wasted costs, even though the preliminary document was technically non-binding.
Bad Faith Withdrawal
Several states treat a preliminary agreement as creating at least some obligation to negotiate in good faith toward a final deal. The consequences of walking away in bad faith vary sharply by jurisdiction. California, Delaware, Illinois, New York, and Washington have enforced good-faith obligations, though most limit recovery to out-of-pocket costs like legal and advisory fees. Delaware has gone further: in at least one notable case, a court awarded full expectation damages for a bad-faith breach of a negotiation agreement, meaning the breaching party paid what the other side would have earned had the deal closed. Texas, Georgia, and Virginia refuse to enforce negotiation agreements at all.
Partial Performance
Once one or both parties start performing the deal described in the preliminary agreement, courts become more willing to treat it as binding. If you’ve already delivered goods, started construction, or transferred funds based on the terms in the document, arguing that no binding deal existed becomes much harder. The more you behave as though the agreement is real, the more likely a court will agree.
The Clauses That Bind Even When the Rest Doesn’t
Most well-drafted agreements in principle split their provisions into two categories: non-binding terms covering the deal itself and binding terms governing the negotiation process. Price, payment structure, and closing conditions sit on the non-binding side. The binding side typically includes:
- Confidentiality, so neither side can disclose the deal’s existence or the information shared during negotiations. This survives even if the deal falls apart.
- Exclusivity, under which one or both parties agree not to negotiate with anyone else for a set period.
- Due diligence access, giving the buyer the right to inspect the seller’s financial records, contracts, and operations.
- Expense allocation, deciding who pays for what if the deal doesn’t close.
- Termination fees in larger transactions, which compensate the non-breaching party if the other side walks away. In public M&A deals, these typically range from about 2% to 3.5% of transaction value, with a median around 2.6%.
For these carve-outs to hold up, the agreement should state explicitly which provisions are binding and which are not. Ambiguity here is an invitation for litigation.
Where You’ll Encounter One
Mortgage Pre-Approval
In mortgage lending, the same concept goes by several names: agreement in principle, decision in principle, mortgage promise, or pre-approval. The lender reviews your income, debts, and credit history and tells you roughly how much it would be willing to lend. It isn’t a loan offer. The lender hasn’t verified everything and hasn’t appraised the property. These typically expire after 60 to 90 days, so a long house search means asking for a new one.
Business Acquisitions and Mergers
Before a buyer spends heavily on legal and financial due diligence, both sides usually sign a preliminary document covering the purchase price, deal structure, and key conditions. The formal purchase agreement comes later, after the buyer has examined the target company’s books, contracts, and liabilities.
Divorce Settlements
Divorcing spouses sometimes reach a preliminary understanding on the big issues, such as how to divide property, who gets custody, and whether either spouse will pay support, before their attorneys draft a formal settlement. Reaching early consensus can cut legal fees, because every contested issue sent to a judge costs both sides more.
Large Commercial Deals
Joint ventures, licensing arrangements, and major supply contracts often start with a preliminary agreement. When the stakes are high enough that both parties need board approval, regulatory clearance, or third-party financing before they can close, a preliminary document lets everyone confirm the deal makes sense before committing resources.
Protecting Yourself at the Preliminary Stage
The biggest risk is not that an agreement in principle binds you when you don’t want to be bound. It’s that you assume it protects you when it doesn’t.
Include “subject to contract” or equivalent non-binding language if you aren’t ready to commit. Be specific about which clauses are binding and which are not. Vague drafting is the single most common source of disputes over preliminary agreements. If you’re the party relying on the deal going through, do not make major financial commitments like starting construction or quitting a job on the strength of a non-binding document alone. Doing so is a bet that promissory estoppel will bail you out, and that is an expensive and uncertain bet.
If you sign a preliminary agreement that includes a good-faith negotiation clause, take it seriously. Walking away without a legitimate reason after the other side has invested significant time and money can expose you to liability in many jurisdictions, even when the document says “non-binding” at the top. The label matters less than your conduct.