When Can a Teenager Sign a Contract Legally in the US?
From phone plans and gym memberships to car purchases and freelance gigs — contracts are everywhere. But the law treats minors differently. Here is what every teenager (and their parents) needs to know about contractual capacity.
Updated March 2026 · 11 min read
The Short Answer
Minors can technically sign most contracts in the US — but the contract is generally voidable at the minor's option, not the adult's. This means a minor can walk away from most contracts they sign, while the adult is bound. There are exceptions: contracts for "necessities" and certain regulated agreements are treated differently. The legal term for a minor canceling a contract is disaffirmance.
The Doctrine of Contractual Capacity
American contract law requires that parties have legal capacity to enter a binding agreement. Capacity requires that both parties:
- Be of legal age (the age of majority — 18 in most states)
- Be mentally competent
- Not be under duress or undue influence
Minors — people below the age of majority in their state — are presumed by law to lack full capacity. This is not a moral judgment; it is a protective presumption. The law assumes that minors may not fully understand or appreciate the long-term consequences of binding legal commitments.
The practical consequence is that contracts signed by minors are voidable — valid and enforceable unless and until the minor chooses to void them. The adult party, however, cannot use the minor's age as a basis to void the contract themselves. The protection runs only in the minor's favor.
Voidable vs. Void: An Important Distinction
Voidable Contract
The contract is valid and operates normally — unless the minor chooses to cancel it (disaffirm). The minor can also ratify it (confirm it) once they reach adulthood, making it permanently binding. Most contracts minors sign are voidable.
Void Contract
Unenforceable from the start — neither party can enforce it. A contract requiring a minor to do something illegal is void (not just voidable). These are rare in the context of minor capacity.
Disaffirmance: How a Minor Cancels a Contract
Disaffirmance is the legal act by which a minor (or a recently turned adult) cancels a contract they entered as a minor. Key rules:
Timing: A minor can disaffirm a contract at any time while they are still a minor, or within a reasonable time after reaching the age of majority. What counts as "reasonable" varies by state — typically weeks to a few months, though courts have discretion.
Method: Disaffirmance can be oral or written, express or implied by conduct (such as returning goods and demanding a refund). The cleaner the communication, the better.
Return of consideration: Upon disaffirmance, the minor must generally return whatever they received under the contract in its present condition. If a minor bought a car and it has depreciated or been in an accident, most states require only that the minor return the car as-is — they do not have to pay for the depreciation.
Ratification: If a minor does nothing to disaffirm a contract after reaching the age of majority, and continues to use goods or services received under it, courts may find that they have ratified (confirmed) the contract, making it permanently binding.
The Necessities Doctrine: When a Minor IS Bound
The most important exception to the voidability rule is the necessities doctrine (sometimes called the "necessaries doctrine"). Under this rule, a minor is liable for the reasonable value of goods or services that are genuinely necessary for their basic welfare.
What Counts as a Necessity?
Generally YES
- · Basic food and groceries
- · Rental housing (basic shelter)
- · Necessary clothing
- · Emergency medical care
- · Necessary prescription medications
- · Legal representation (in some courts)
- · Tools needed for employment (in some courts)
Generally NO
- · Gym memberships
- · Streaming subscriptions
- · Video games and consoles
- · Concert tickets
- · Luxury clothing or accessories
- · Non-essential electronics
- · Sports equipment (recreational)
Importantly, the necessities doctrine holds the minor liable for the reasonable value of the necessity — not necessarily the contract price. If a minor agreed to pay an inflated price for a necessity, a court may reduce the obligation to the market rate.
Real-World Scenarios
Signing Up for a Gym Membership
A minor who signs a gym contract can generally disaffirm it. Gym memberships are not necessities. The minor would need to stop using the gym and notify the company of disaffirmance.
Many gyms now require minors to have a parent or guardian co-sign, which is smart business practice — because the co-signing adult is fully bound even if the minor disaffirms.
Getting a Phone Plan
A mobile phone contract signed by a minor is voidable. Major carriers (Verizon, AT&T, T-Mobile) typically require the account holder to be 18+ and will require a parent to be the primary account holder for minors.
If a minor somehow manages to sign a phone contract independently, they could disaffirm it — though whether a smartphone qualifies as a "necessity" is increasingly debated, particularly where it is needed for school communications or employment.
Buying a Car
A minor can sign a car purchase agreement — but can also disaffirm it and return the car (in its current condition). Dealerships know this and commonly require a parent to co-sign or simply refuse to sell to minors.
Some courts have found that a car used for work commuting qualifies as a necessity for an emancipated minor with no other transportation option — making disaffirmance unavailable in those limited circumstances.
Freelancing Online (Upwork, Fiverr, etc.)
Most major freelance platforms require users to be 18+ in their Terms of Service. A minor who creates an account by falsely confirming they are 18 violates the platform's terms and risks account termination and fund withholding.
Legally, the minor's ToS agreement would be voidable — but this rarely helps them in practice, since it is the platform (not the minor) that typically acts first by closing the account. Minors who want to freelance professionally should do so under a parent's account or wait until they are 18.
Renting an Apartment
As discussed in our guide on moving out, landlords can legally decline to rent to minors because a lease signed by a minor is voidable. A minor could disaffirm a lease, leaving the landlord without a valid contract and potentially without rent.
Emancipated minors are treated as adults for leasing purposes and can sign binding leases.
Clicking "Agree" on Terms of Service
Online terms of service agreements are contracts. A minor who clicks "I Agree" enters a voidable contract — meaning they could technically disaffirm. However, the practical enforceability of ToS against individual minor users is essentially nonexistent. The ToS matters more when the platform wants to enforce obligations against the minor (data licensing, arbitration clauses, etc.).
COPPA (Children's Online Privacy Protection Act) provides separate federal protections for children under 13, requiring verifiable parental consent before collecting personal data.
Contracts Minors Generally Cannot Disaffirm
Beyond necessities, several categories of contracts are specifically non-voidable by minors under various state statutes:
- ·Court-ordered obligations: If a court orders a minor to pay restitution, child support, or comply with any other legal obligation, that order is binding regardless of age.
- ·Enlistment contracts: Military enlistment agreements signed with parental consent are binding on the minor.
- ·Student loan agreements (federal): Federal student loans made under the Higher Education Act have specific rules — generally, minors who borrow under federal programs cannot disaffirm.
- ·Professional/entertainment contracts (some states): California, New York, and some other states have laws that allow courts to validate entertainment contracts for minors (child actors, musicians), making those contracts binding if judicially approved.
- ·Insurance agreements (some states): Some states allow minors to purchase health or life insurance and bind themselves to those contracts.
- ·Contracts by emancipated minors: An emancipated minor has the full contractual capacity of an adult. Their contracts are fully binding and cannot be disaffirmed on the basis of age.
Frequently Asked Questions
Can a minor be held to an employment contract or non-compete?
Minors can enter employment agreements for wages, and employers can legally pay and supervise a minor employee. However, restrictive clauses like non-compete agreements are generally not enforceable against minors because the minor can disaffirm the contract. Courts are also skeptical of non-competes against minors even if the minor is emancipated, since public policy generally disfavors restraints on a young person's ability to earn income.
If I lie about my age to sign up for an online service, am I legally bound?
Possibly, depending on state law. Some states (notably California) hold that a minor who lies about their age to enter a contract may be estopped (legally prevented) from disaffirming. In most states, however, the ability to disaffirm survives even fraudulent misrepresentation of age — though the minor may be liable for any damages caused by the fraud itself. As a practical matter, most online service agreements are not actively enforced against individual minors.
Can a parent be held responsible for a contract their child signs?
Not automatically. Parents are not parties to contracts their children sign and are not liable simply because the minor is their child. However, if a parent co-signs a contract with a minor, the parent is fully liable as a co-signer. Some states also have statutes making parents liable for a minor's acts of willful misconduct (not contract breaches). A parent's liability for a minor's contracts generally requires the parent to have explicitly agreed to be a guarantor.
What counts as a 'necessity' for the necessities doctrine?
Courts use a context-sensitive test. Classic necessities include basic food, housing, clothing, and medical care. Whether something qualifies depends partly on the minor's circumstances — what is a necessity for a homeless minor may not be a necessity for one who has a stable home. Courts have sometimes found car purchases necessary for employment transportation, internet access necessary for education, and certain professional services (like attorney fees) to be necessities. Luxury items, entertainment, and non-essential goods clearly do not qualify.
Can a freelance platform (like Upwork or Fiverr) enforce its ToS against a minor?
Technically, a minor could disaffirm their account agreement as a voidable contract. In practice, most freelance platforms explicitly prohibit users under 18 in their Terms of Service. If a minor circumvents this age restriction, they risk account termination and potential withholding of earned funds. Some platforms are beginning to offer pathways for minor professionals with parental oversight, but for most major platforms, under-18 users operate in a legal gray zone even if their work is legitimate.
What happens to a car or phone I bought under contract if I disaffirm?
If you disaffirm a contract to purchase a car, phone, or other item, you are generally required to return the property in the condition it's in at the time of disaffirmance — even if it has depreciated or been damaged. You do not have to restore the seller to their original position by paying for depreciation or damage in most states. This is a meaningful protection for minors but can be harsh for sellers, which is why many businesses simply refuse to transact with minors.