A simple contract is any legally binding agreement formed without a seal, deed, or other special formality. The word “simple” has nothing to do with how short or straightforward the terms are. A five-hundred-page software license and a handshake deal to mow your neighbor’s lawn are both simple contracts, because neither one requires a wax seal, notarization, or the ceremonial execution process that historically marked “formal” contracts. What makes any simple contract enforceable comes down to six core elements.
Simple vs. Formal Contracts
English common law historically split contracts into two categories. A formal contract, also called a contract under seal or a deed, had to be signed, witnessed, and physically sealed. Courts would enforce a sealed contract even without proof that anything of value changed hands. A simple contract skipped all of that ceremony. Instead, courts asked whether the parties genuinely agreed to exchange something of value, and if so, they enforced the deal.
Today, sealed contracts have largely disappeared from everyday transactions. A few states still recognize them for specific purposes like real estate conveyances, but the overwhelming majority of agreements people enter into are simple contracts. Employment agreements, leases, purchase orders, online terms of service, and verbal deals at a farmers’ market all fall into this category. If no law or tradition requires a seal or deed for the particular type of agreement, you’re looking at a simple contract.
The Six Elements Every Simple Contract Needs
A simple contract isn’t enforceable just because two people shook hands. Six elements must all be present. Drop any one and you don’t have a contract a court will enforce.
Offer
An offer is a clear proposal from one party to another, showing willingness to be bound if the other side agrees. It has to be specific enough that a reasonable person would understand what’s being proposed and expect a binding deal to follow from acceptance.1Legal Information Institute. Offer A price tag on a shelf, a written bid from a contractor, or a verbal quote for services can all qualify. Vague statements like “I might sell my car someday” are not offers, because they don’t signal a willingness to be bound right now.
Acceptance
Acceptance is the other party’s clear agreement to the offer’s terms. Under the traditional common law rule, acceptance has to match the offer exactly. If you change anything, you’ve made a counteroffer, which kills the original offer and starts a new negotiation.1Legal Information Institute. Offer This principle gets relaxed for sales of goods, where an acceptance with minor additional terms can still form a binding contract, especially between merchants. But for services, real estate, and most other agreements, changing the terms in your “acceptance” means you haven’t actually accepted.
Consideration
Consideration is the thing of value each side gives up or promises. Money is the most obvious example, but consideration also includes services, goods, or a promise to refrain from doing something you’d otherwise have a right to do. The key requirement is that consideration must be bargained for. Each party’s promise or action has to be given in exchange for the other’s. A gift doesn’t count because the person receiving it didn’t promise anything in return. Past favors don’t count either, because they weren’t part of the current deal. A token payment inserted purely to create the appearance of a bargain won’t satisfy a court.
The law doesn’t require consideration to be equal in value. You can sell a car worth $10,000 for $1,000 if that’s what you genuinely agree to. Courts care that both sides gave something, not that both sides gave something equivalent.
Intention to Create Legal Relations
Both parties need to intend their agreement to carry legal weight. In commercial settings, courts presume this intention exists. Nobody signs a purchase order as a joke. Social and family arrangements go the other way. If you promise to meet a friend for dinner and don’t show up, there’s no breach of contract, because neither of you intended that promise to be legally enforceable. The line can blur with family business deals or handshake agreements between friends involving real money, so putting the terms in writing helps signal that both sides mean business.
Capacity
Each party needs the legal ability to enter the contract. This generally means being at least 18 years old and mentally competent to understand what the agreement involves. Contracts signed by minors are not automatically void. Instead, they’re voidable at the minor’s option. A minor can walk away from a contract at any time before turning 18, or within a reasonable period after, by communicating an intent not to be bound. The adult on the other side stays bound unless the minor chooses to cancel. One important exception: minors remain liable for the reasonable value of necessities like food, housing, clothing, and medical care, even if they cancel the contract.
Mental incapacity works similarly. If someone lacks the ability to understand the nature of the agreement due to cognitive impairment or intoxication, the contract is typically voidable at that person’s option.
Legality
The contract’s purpose and subject matter must be lawful. An agreement to do something illegal is void from the start and can’t be enforced by either party. The same goes for contracts that violate public policy, such as agreements that unreasonably restrict competition or waive liability for intentional harm. A court won’t help you collect on a deal that shouldn’t have existed in the first place.
Oral and Written Simple Contracts
Simple contracts can be spoken or written. An oral contract is generally just as enforceable as a written one, as long as all six elements are present.2Legal Information Institute. Oral Contract The problem with oral contracts isn’t legality but proof. When a dispute arises, you need to convince a court that the agreement existed and what its terms were. Testimony from witnesses, emails and texts exchanged around the conversation, invoices, receipts, and the parties’ later behavior can all help establish what was agreed to, but none of it is as clean as a signed document.
When Writing Is Required: The Statute of Frauds
Certain categories of contracts must be in writing to be enforceable, regardless of how clearly both sides remember the conversation. These rules, known collectively as the Statute of Frauds, vary somewhat by jurisdiction but generally cover:
- Contracts for the sale or transfer of an interest in land.
- Agreements that, by their terms, cannot be fully performed within one year from the date they’re made.
- Contracts for the sale of goods priced at $500 or more, which under the Uniform Commercial Code need written evidence signed by the party being held to the deal.2Legal Information Institute. Oral Contract
- Promises to pay someone else’s debt if they default.
- Agreements made in consideration of marriage, including prenuptial agreements.
The Statute of Frauds has exceptions. In real estate transactions, for example, courts sometimes enforce oral agreements when one party has already made payments, taken possession of the property, or made significant improvements in reliance on the deal. These actions can take the agreement outside the writing requirement. Counting on an exception is a gamble, though. If your contract falls into one of these categories, get it in writing.
Electronic Agreements
Clicking “I agree” on a website, signing a PDF with your finger on a tablet, or typing your name into an electronic form can all create enforceable simple contracts. Federal law provides that a signature or contract cannot be denied legal effect solely because it’s in electronic form.3Office of the Law Revision Counsel. 15 USC 7001 – General Rule of Validity This federal rule applies to any transaction affecting interstate or foreign commerce, which covers the vast majority of online purchases and digital agreements.
At the state level, 49 states and the District of Columbia have adopted the Uniform Electronic Transactions Act, which mirrors the federal approach. New York has its own separate law recognizing electronic signatures. The practical result is the same everywhere: electronic contracts are real contracts, and the same six elements apply. If you click “agree” to terms that include an offer, your acceptance, and an exchange of value, you’ve formed a binding simple contract just as surely as if you’d signed a paper document at a conference table.
For an electronic signature to be valid, both parties need to intend to sign, consent to conducting the transaction electronically, and retain access to the signed record. These aren’t burdensome requirements, and most online checkout flows and contract platforms satisfy them automatically.
When a Simple Contract Can Be Challenged
Having all six elements doesn’t make a contract bulletproof. Several defenses can make an otherwise valid agreement unenforceable, and the difference between a void contract and a voidable one matters here.
A void contract was never enforceable in the first place. It’s treated as though it never existed. Contracts for illegal purposes are the clearest example. Neither party can enforce a void agreement, and no amount of ratification fixes it.
A voidable contract is valid and enforceable until the party with the right to cancel actually does so. Contracts with minors are the classic example. The deal stands unless the minor exercises the right to walk away. If the minor reaches adulthood and doesn’t cancel within a reasonable time, the contract becomes fully binding. Only voidable contracts can be ratified through a new promise to perform.
Even when both parties had capacity and the subject matter was legal, the circumstances surrounding the agreement can undermine it. The most frequently raised defenses include fraud, where one party deliberately deceived the other to induce them to sign; misrepresentation, which covers the same kind of false statement about a material fact but doesn’t require that the lie be intentional; duress, meaning threats or wrongful economic pressure used to force a signature; undue influence, where one party used a position of power or trust to overpower the other’s free will, often in relationships between caregivers and elderly individuals or attorneys and clients; unconscionability, where the terms are so one-sided that no reasonable person would have agreed to them voluntarily; and mutual mistake, where both parties shared a false belief about a fundamental fact underlying the deal.
Raising one of these defenses doesn’t automatically cancel the contract. You typically need a court to confirm that the defense applies, especially if the other side disagrees. Acting quickly matters, because continuing to perform under the contract after discovering the problem can be treated as ratification.
Everyday Examples of Simple Contracts
Most people form multiple simple contracts every day without thinking about it. Buying coffee involves an offer (the menu price), acceptance (your order), and consideration (your payment for the drink). The transaction is so routine that it barely registers as a legal event, but all six elements are present and enforceable.
Hiring someone to walk your dog, booking a ride through a transportation app, purchasing something online, or agreeing to let a neighbor use your lawnmower in exchange for trimming your hedges are all simple contracts. The freelance designer who agrees to build your website for $2,000 has formed a simple contract, and so has the restaurant that takes your reservation for a prix fixe dinner.
Where people run into trouble is treating these everyday agreements casually when real money or real obligations are at stake. A verbal agreement to renovate a kitchen for $15,000 is still a simple contract, but proving its terms after a dispute will be significantly harder than proving the terms of a written one. The more money and complexity involved, the more important it becomes to document the deal, even though the law doesn’t always require it.