Contract law examples turn up in situations most people never label as “legal”: accepting a job offer, buying a refrigerator, signing a lease, hiring a contractor, clicking “I agree” on a checkout page. Each of those is a contract, and each one has to clear the same five hurdles to be binding: an offer, acceptance of that offer, consideration (something of value flowing both ways), legal capacity on both sides, and a lawful purpose.1Legal Information Institute. Contract What changes from one example to the next is the body of rules layered on top, the warranties built in by default, and what you can do when the other side fails to hold up their end.
What Makes Any Agreement a Contract
Acceptance has to mirror the offer. If the other side changes a material term while “accepting,” that’s a counter-offer, and the original offer dies. Consideration means each side gives up something of value, whether money, a promise to act, or a promise not to act. A one-way gift isn’t a contract no matter how sincere the promise.1Legal Information Institute. Contract
Capacity usually means being at least 18 and of sound mind.2Legal Information Institute. Age of Majority A contract with a minor isn’t automatically void, but the minor can walk away from it; the adult on the other side cannot. The purpose has to be legal, so an agreement to split profits from an illegal operation is unenforceable no matter how carefully drafted.
Most agreements don’t need to be in writing. The main exception is the Statute of Frauds, which demands a signed writing for sales of land, contracts that can’t be performed within a year, sales of goods worth $500 or more under the Uniform Commercial Code, and promises to pay someone else’s debt.3Legal Information Institute. Statute of Frauds Outside those buckets, a handshake deal is technically enforceable. Proving what you agreed to is another matter.
Employment Agreements
Starting a job triggers a stack of contracts. The offer letter sets salary or hourly rate, start date, title, and benefits. In every state except Montana, it also establishes at-will employment, meaning either side can end the relationship for any reason that isn’t illegal.4Legal Information Institute. Employment-at-Will Doctrine At-will is the default even when the letter doesn’t say so.
Confidentiality and Ownership of Work
A non-disclosure agreement creates a legal duty to protect proprietary information, often indefinitely. Share trade secrets with a competitor after signing one and your former employer can sue for damages or get a court order stopping further disclosure.
Work-for-hire provisions decide who owns what you create on the job. Under federal copyright law, when an employee creates something within the scope of their job, the employer is the author and owns the rights.5Office of the Law Revision Counsel. 17 USC 101 – Definitions For independent contractors, the rule is narrower: the work has to fall into specific categories, and the parties must agree in writing that it’s a work for hire.6Office of the Law Revision Counsel. 17 USC 201 – Ownership of Copyright A freelance developer who builds an app without that written agreement may own the copyright even if a company paid for the work.
Non-Competes and Non-Solicitations
A non-compete clause restricts you from working for a competitor within a defined area for a set period after you leave. Courts weigh whether the scope and duration are reasonable, and an overly broad clause can be struck down or trimmed. Four states ban non-competes entirely, and more than 30 others impose significant restrictions, such as income thresholds below which they don’t apply. The FTC tried a nationwide ban in 2024, but a federal court blocked the rule. As of 2026, the FTC is pursuing case-by-case enforcement actions against companies with practices it considers unfair.7Federal Trade Commission. FTC Takes Action Against Noncompete Agreements, Securing Protections for Workers
Non-solicitation clauses are narrower. Instead of blocking you from a whole industry, they stop you from recruiting your former employer’s clients or coworkers, and courts tend to enforce them more readily because they don’t prevent you from earning a living in your field.
Wage Promises
Your agreement to work for a specific wage is itself a contract. Under federal law, an employer who violates wage rules may owe you the unpaid amount plus an equal sum in liquidated damages, effectively doubling what’s owed, along with attorney’s fees and court costs.8U.S. Department of Labor. Back Pay Courts award those liquidated damages by default unless the employer proves it acted in good faith and genuinely believed it was following the law.
Consumer Purchases
Buying physical goods triggers a specialized set of rules. The Uniform Commercial Code, adopted in some form by every state, governs sales of goods from a $20 kitchen gadget to a $40,000 piece of equipment.9Legal Information Institute. UCC – Article 2 – Sales The UCC fills gaps the parties didn’t address, which matters because most consumer purchases don’t involve any negotiation.
Built-In Warranties
The implied warranty of merchantability is one of the UCC’s most important protections. Any merchant who sells goods automatically promises those goods are fit for their ordinary purpose. A new refrigerator that can’t keep food cold, or boots that fall apart on the first wear, breaches that warranty even if nobody explicitly promised quality.10Legal Information Institute. UCC 2-314 – Implied Warranty: Merchantability; Usage of Trade The seller doesn’t have to be the manufacturer; the warranty attaches to any merchant selling goods of that kind.
For products over $15, federal law adds a layer. The Magnuson-Moss Warranty Act requires any seller offering a written warranty to label it either “Full” or “Limited” and spell out what’s covered, what’s excluded, and how to make a claim.11Federal Trade Commission. Businessperson’s Guide to Federal Warranty Law If the product breaks and the warranty terms aren’t met, the buyer has a federal claim in addition to state UCC remedies.
Online “I Agree” Boxes
Checking an “I agree” box during an online purchase creates a click-wrap agreement. Courts generally enforce these because the buyer has notice of the terms and affirmatively indicates consent. They govern returns, data privacy, and dispute resolution, and they often include mandatory arbitration clauses that waive your right to sue in court. The purchase itself is a straightforward express contract: you promise payment, the seller promises delivery.
Door-to-Door and Off-Premises Sales
Some sales come with a cancellation window built in. The FTC’s Cooling-Off Rule gives you three business days to cancel purchases of $25 or more made at your home, your workplace, or at temporary locations like hotel conference rooms or trade shows.12Federal Trade Commission. Cooling-off Period for Sales Made at Home or Other Locations The seller has to provide cancellation forms at the time of sale; if they don’t, you can write your own cancellation letter. The deadline runs to midnight of the third business day after the sale, and Saturday counts.
Real Estate Agreements
Land contracts are heavily regulated. Because every parcel is unique and the dollar amounts are large, the Statute of Frauds requires every real estate agreement to be in writing and signed to be enforceable.3Legal Information Institute. Statute of Frauds A verbal promise to sell a house is not a contract.
Purchase Agreements
A residential purchase agreement sets price, closing date, and the contingencies that let a buyer back out. The usual ones are a satisfactory home inspection, the buyer’s ability to secure financing, and an appraisal that supports the purchase price. The buyer typically puts up an earnest money deposit held in escrow. If the buyer walks away without a valid contingency, the seller may keep that deposit as liquidated damages.
Because land is considered unique, courts can order specific performance rather than just awarding money. If a seller backs out, a judge can order the sale to go through, since money can’t perfectly substitute for the particular property.
Residential Leases
A lease creates a temporary right to occupy property in exchange for rent. It locks in the monthly payment, the duration (commonly 12 months), the security deposit, and the rules of the property. Both sides are held to its terms. If a tenant stops paying, the landlord can begin eviction proceedings. If the landlord fails to maintain habitable conditions, the tenant may have remedies ranging from rent withholding to lease termination, depending on the jurisdiction.
Mortgage Documents
Buying with borrowed money involves two contracts. The promissory note is your personal promise to repay the loan over a set term, typically 15 or 30 years. The mortgage (or deed of trust, depending on the state) creates a security interest in the property itself, giving the lender the right to foreclose if you default. These documents are recorded in local land records, putting the world on notice that the lender has a claim.
Service and Professional Contracts
Service contracts cover labor and expertise rather than goods, so the UCC doesn’t apply. General contract-law principles govern instead, which means the automatic warranties that come with goods don’t exist here. What you get depends on what the written agreement says.
Home Improvement
A renovation contract should define the scope of work in detail: materials, finished product, timeline, and payment schedule. Contractors commonly structure payments in stages, such as a percentage upfront with the balance on completion. The homeowner isn’t paying in full for work not yet done, and the contractor isn’t financing the whole project. If the work doesn’t meet the agreed standard, the homeowner can seek damages for the cost of correcting the deficiencies.
Consulting
Consulting agreements engage independent contractors who manage their own taxes and equipment, which distinguishes them from employment contracts. They specify deliverables, set milestones, and establish a fee that’s hourly, flat, or per-project. Specific benchmarks like “deliver a 30-page market analysis by June 1” prevent disputes; vague language like “satisfactory results” invites them.
Indemnification
Professional service contracts often include indemnification clauses, sometimes called hold-harmless provisions. These shift risk by requiring one party to cover losses, legal fees, or third-party claims arising from the other party’s work. A broad clause covers all liabilities regardless of fault; a limited one applies only when the indemnifying party was directly at fault. If you’re signing a service contract, this is where the real financial exposure usually hides.
When Someone Breaks the Deal
A breach happens when one party fails to perform. The distinction between a material breach and a minor one drives the whole analysis.
A material breach is a failure so significant that it destroys the core purpose of the contract. Hire a caterer for a wedding and they don’t show up: that’s material. The non-breaching party can stop their own performance, terminate the contract, and sue for damages. A minor breach is a less serious deviation. The caterer shows up but serves the wrong appetizer. Payment is still owed for the service as a whole, but damages are recoverable for the specific shortcoming.
Money Damages
The standard remedy puts you in the position you’d have been in if the contract had been performed. That means the direct loss of value plus consequential losses, minus any costs you saved by not having to perform. If a supplier fails to deliver materials and you lose a $50,000 production run, your damages include the cost of replacement materials plus the lost profits from the disruption.
Some contracts specify in advance what damages are owed for a breach. These liquidated damages clauses are enforceable if the amount is a reasonable estimate of likely harm and actual damages would be hard to calculate. The earnest money deposit in a real estate deal is a common example. A clause designed to punish rather than compensate is an unenforceable penalty.13Legal Information Institute. Liquidated Damages Courts measure reasonableness as of the time the contract was formed, not with hindsight.
Forcing Performance
When money can’t make a party whole, courts can order specific performance, compelling the breaching party to actually do what they promised. This is most common in real estate because every parcel is unique, and it extends to rare goods and one-of-a-kind items. Courts won’t order specific performance for personal services, since forcing someone to work raises obvious problems.
The Buyer’s Right to Cover
Under the UCC, if a seller fails to deliver goods, the buyer can “cover” by purchasing reasonable substitutes elsewhere. The buyer recovers the difference between the substitute price and the contract price, plus incidental or consequential damages.14Legal Information Institute. UCC 2-712 – Cover; Buyer’s Procurement of Substitute Goods The buyer has to act in good faith and without unreasonable delay. Waiting months and then buying a gold-plated replacement doesn’t qualify.
When a Signed Contract Isn’t Enforceable
Some contracts fail even after everyone signs. These defenses attack the formation itself, arguing the consent or purpose was fundamentally flawed.
Capacity is the first. Minors under 18 can disaffirm a contract during minority or within a reasonable time after turning 18, and recover any property they transferred.2Legal Information Institute. Age of Majority The adult on the other side has no corresponding right to walk away. People who were mentally incapacitated or intoxicated at signing may also be able to void the agreement.
Duress covers more than physical threats. If a vendor threatens to withhold critical supplies during a production deadline unless you accept a massive price increase, and you have no reasonable alternative, that economic pressure can qualify. The threat has to be credible and immediate, with no meaningful choice but to agree.
Unconscionability lets courts refuse to enforce a contract or strike specific terms when the deal is grossly one-sided. Courts look at both how the deal was made (deceptive fine print, extreme bargaining imbalance) and the terms themselves (price wildly out of line with value, terms overwhelmingly favoring one side). A contract is most vulnerable when both are present.15Legal Information Institute. Unconscionability
Illegality kills a contract from the start. You can’t sue to collect illegal gambling debts or enforce a price-fixing agreement. Courts will sometimes sever the illegal portion and enforce the rest, but only if the illegal part is secondary to the main purpose.
How Contracts End Cleanly
Most contracts don’t end in a lawsuit. They just run their course.
Full performance is the simplest ending: both sides do what they promised, and the obligations are discharged. Substantial performance is the close cousin. If a contractor builds a house that matches the blueprints in every material respect but installs a different brand of cabinet hinges, the contract is substantially performed. The homeowner can’t refuse to pay but can recover damages for the deviation. The question is whether the non-breaching party received essentially what they bargained for.
Both parties can also agree to tear the contract up. Mutual rescission is itself a contract, and each side’s consideration is giving up the right to enforce the original. For agreements originally required to be in writing, the rescission should also be in writing.
Extraordinary events can discharge obligations too. Many commercial contracts include a force majeure clause excusing performance when events like natural disasters, wars, or pandemics prevent a party from performing.16Legal Information Institute. Force Majeure Courts read these clauses narrowly. An economic downturn or general business difficulty doesn’t qualify; the event has to actually prevent performance, not just make it more expensive. Some jurisdictions require the specific type of event to be listed in the clause.
Even without a force majeure clause, two common-law doctrines can apply. Impossibility applies when an unforeseen event destroys the subject matter or makes performance objectively impossible, such as a fire destroying the specific building that was the subject of a lease. Frustration of purpose applies when the underlying reason for the contract has been eliminated by an unforeseeable event, even though performance is technically still possible. Both set a high bar: partial difficulty or reduced profitability isn’t enough.