What are the six types of contracts
Look, if you're doing business or just signing stuff in your personal life, you gotta wrap your head around the six main types of contracts. They're legally binding promises—that's the whole deal. How they're classified tells you what's enforceable, who owes what, and what happens if things go sideways. Contract law? Yeah, it's a beast. But these six categories? They're your basic framework. We're talking express, implied, unilateral, bilateral, executed, and executory. Each one does its own thing and comes with its own legal baggage.
1. Express vs. Implied Contracts: How are they formed?
So first up, how do parties actually show they agree? An express contract happens when everything's laid out crystal clear—written or spoken. All the terms are right there. Think a signed lease, or someone saying "I'll pay you fifty bucks to mow my lawn." Boom, express. Then there's implied contracts. These get created by what people do, not what they say. The law just infers a promise from their behavior. Classic example: you walk into a doctor's office and get treated. No paper signed, no discussion of fees. But legally? You're on the hook to pay a reasonable amount. They call these "implied-in-fact" contracts sometimes.
What is an example of an implied contract?
Implied contracts come from people's actions, plain and simple. Order food at a restaurant? You've got an implied contract. By ordering, you're promising to pay. The restaurant, by serving, promises the food won't poison you. Nobody's talking about payment terms out loud, but the law says there's a deal based on how everyone's acting. Another one: a property owner lets a contractor start working, knowing the guy expects to get paid. If the owner doesn't stop it, an implied contract exists. It's practically automatic.
2. Unilateral vs. Bilateral Contracts: Who makes the promise?
This one's about how many promises are floating around. A bilateral contract is a promise for a promise. Both sides have to do something. Most business deals—like buying a car—are bilateral. Buyer promises cash, seller promises the car. A unilateral contract? That's a promise for an act. Only one person makes a promise. The contract only forms when the other side actually does the thing. Think reward offers: "I'll give $100 to whoever finds my dog." Nobody gets the contract until they find the mutt and hand it over.
What is the key difference between unilateral and bilateral contracts?
The big difference is how you accept. Bilateral contract? You accept by promising to do something. Simple. Unilateral? You gotta actually finish the act. Until that's done, the offer can be yanked off the table. That matters for risk. Say a construction company offers a bonus for early completion—that's unilateral. The bonus only comes when the project's actually, totally finished. Not a minute before.
3. Executed vs. Executory Contracts: Are the obligations complete?
Now we're looking at where things stand performance-wise. An executed contract means everyone's done their part. All obligations? Fulfilled. Like buying coffee with cash—you pay, you get the coffee. Nothing left to do. An executory contract has stuff still pending. Most long-term deals—a year-long lease, a construction project—stay executory until the last payment and delivery. A contract can be part executed, part executory. Contractor finishes half the job? That half's executed, the other half's still hanging.
Why is the distinction between executed and executory important?
This distinction decides your rights and what you can do about it. With an executory contract, if someone screws up big time, you might be able to back out or change the deal. Executed contract? The performance is done, so you're mostly looking at money damages. Plus, the statute of frauds—that's the law that says some contracts gotta be in writing—often cares about whether a contract's still executory. A written note might be enough if it's not yet performed.
Data Table: Overview of the Six Types of Contracts
| Type | Basis of Classification | Key Feature | Example |
|---|---|---|---|
| Express | Formation | Terms are stated explicitly (written or oral) | Signed employment contract |
| Implied | Formation | Terms are inferred from actions and circumstances | Receiving medical treatment |
| Unilateral | Promise | One promise in exchange for an act | Reward offer for lost property |
| Bilateral | Promise | Promise exchanged for promise | Contract for sale of a car |
| Executed | Performance | All obligations have been fully performed | Buying a coffee with cash |
| Executory | Performance | Some or all obligations remain to be performed | A one-year lease agreement |
Checklist: How to Identify Which Type of Contract You Have
Use this checklist to analyze any agreement:
- Formation: Are the terms spoken or written? If yes, it is likely an express contract. If terms are inferred from behavior, it is an implied contract.
- Promise Structure: Is there a promise for a promise? If yes, it is bilateral. Is there a promise for an act? If yes, it is unilateral.
- Performance Status: Have all obligations been completed? If yes, it is executed. If anything remains to be done, it is executory.
- Consideration: Is there a bargain for exchange of value? If no, the contract may be void or voidable.
- Writing Requirement: Is the contract subject to the statute of frauds? If yes, it must be in writing to be enforceable.
Expert Insights on Contract Classification
"Knowing these six contract types isn't just some academic thing—it's real-world risk management. Take unilateral contracts: the offeror's at risk because acceptance happens through performance, and they can revoke anytime before that's done. Bilateral contracts? Way more certain—both sides are locked in once acceptance happens. And the executed vs. executory split? That's huge for accounting and figuring out when you can sue for breach."
Frequently Asked Questions (FAQ)
Can a contract be both express and implied?
Generally, no—it's one or the other. But a single deal can have both flavors. A written lease is express, but the law might imply stuff like a warranty that the place is habitable. The main agreement is express; the law just adds some implied duties on top.
What happens if a unilateral contract offer is revoked before performance?
In most places, if the offeror revokes before you start doing the thing, you're out of luck. But once you begin performing, the offer becomes irrevocable for a reasonable time so you can finish. That's the "start of performance" rule—it protects you a bit.
Is a verbal agreement a valid contract?
Yeah, tons of verbal deals are totally enforceable, as long as they've got the basics: offer, acceptance, consideration, capacity, and legality. But some stuff—like selling land or agreements that take over a year to complete—needs to be in writing because of the statute of frauds.
What is an example of an executory contract?
Think subscription services. Sign up for a year of streaming? You're promising to pay monthly, they're promising to keep the content flowing. At the start, both of you have future obligations—payments and service. The contract stays executory until the subscription ends.
Short Summary
- Six Core Types: The six types of contracts are express, implied, unilateral, bilateral, executed, and executory, classified by formation, promise, and performance.
- Formation Matters: Express contracts use explicit words; implied contracts are inferred from conduct. Both are legally binding.
- Promise Structure: Bilateral contracts involve a promise for a promise; unilateral contracts involve a promise for an act.
- Performance Status: Executed contracts are fully performed; executory contracts have future obligations. This distinction is vital for remedies and accounting.