Arbitration Agreements: Are They Enforceable and Can You Opt Out?

Last updated: 23 October 2026. This guide explains when arbitration agreements are enforceable in the United States, the main exceptions, how opt-out clauses work and how consumer rules differ in the UK and the EU. It is general information, not legal advice.

Short answer: In the US, most arbitration agreements are enforceable. The Federal Arbitration Act makes them “valid, irrevocable, and enforceable” unless a normal contract defence such as unconscionability applies, and the Supreme Court has upheld class action waivers. Key exceptions cover sexual harassment and assault claims and transportation workers. If your contract has an opt-out window, using it in time is the surest way out.

Key takeaways

• Section 2 of the Federal Arbitration Act (FAA) makes written arbitration agreements enforceable, subject only to defences that apply to contracts generally.
• Since March 2022, a person bringing a sexual harassment or sexual assault claim can choose to go to court even if they signed a pre-dispute arbitration agreement.
• Many consumer and employee agreements include an opt-out clause. It only works if you follow its deadline and method exactly.
• In England and Wales, an arbitration clause in a consumer contract is automatically unfair for claims of £5,000 or less, and EU law treats forced consumer arbitration with suspicion.

What is an arbitration agreement?

An arbitration agreement is a promise to resolve a dispute in private arbitration rather than in court. Most are written into contracts before any dispute exists, such as employment contracts, phone and credit card terms, app terms of service and commercial deals. Less often, the parties sign one after a dispute arises, sometimes called a submission agreement.

Modern clauses usually do more than pick arbitration. They often include:

• A class action waiver, which requires each person to bring claims individually rather than as part of a group.
• A delegation clause, which gives the arbitrator rather than a judge the power to decide whether the clause itself is valid.
• Rules and costs terms, naming a provider, the seat of the arbitration and who pays the fees.
• An opt-out clause, which lets you reject arbitration within a set time after accepting the contract.

For how arbitration itself works, including hearings, awards and costs, see our guide to what arbitration is and when to choose it.

Are arbitration agreements enforceable in the US?

Usually, yes. Section 2 of the FAA says a written arbitration provision in a contract involving commerce “shall be valid, irrevocable, and enforceable, save upon such grounds as exist at law or in equity for the revocation of any contract”. In plain terms, courts treat an arbitration clause like any other contract term. It can be defeated by general defences such as lack of agreement, fraud, duress or unconscionability, but not by rules that single out arbitration for worse treatment.

The Supreme Court has read the FAA broadly for decades. The cases below shape most disputes today.

The Court’s 2025 to 2026 term also produced Jules v. Andre Balazs Properties (May 2026), which held that a federal court that stays a case for arbitration keeps jurisdiction to confirm or vacate the award afterwards.

When is an arbitration agreement not enforceable?

Despite the FAA’s reach, there are several ways to avoid a clause. The most common are:

1. No real agreement. Arbitration rests on consent. If terms were never properly presented or accepted, there may be no contract to enforce.
2. Unconscionability. Most states require both procedural unfairness (how the deal was made, such as a take-it-or-leave-it form with no meaningful choice) and substantive unfairness (one-sided terms). California’s Armendariz decision, for example, set minimum protections for mandatory employment arbitration of statutory claims, including a neutral arbitrator, adequate discovery, a written award and limits on the costs an employee can be made to pay.
3. Sexual harassment and assault claims. A federal statute lets the person bringing the claim choose court instead, as explained below.
4. Transportation workers. Section 1 of the FAA excludes contracts of employment of workers engaged in interstate commerce, which recent cases have read to include many drivers and logistics staff.
5. Waiver. A business that sues or defends in court for months before asking for arbitration may lose the right, and after Morgan v. Sundance the other side need not show it was harmed by the delay.

Class waivers are the hardest part to escape. After Concepcion and Epic Systems, a waiver will usually be enforced unless the whole clause falls. One response from claimants’ lawyers has been to file large numbers of individual arbitrations at once, which our article on mass actions and class actions puts in context.

What does the 2022 law on sexual harassment claims change?

The Ending Forced Arbitration of Sexual Assault and Sexual Harassment Act of 2021 was signed into law on 3 March 2022 and added Chapter 4 to the FAA. Under 9 U.S.C. § 402, at the election of the person alleging sexual harassment or sexual assault, “no predispute arbitration agreement or predispute joint-action waiver shall be valid or enforceable” for a case that relates to that dispute.

Three details matter in practice:

• It is the claimant’s choice. They can still arbitrate if they prefer.
• It covers both the arbitration clause and any class or collective action waiver.
• A court, not an arbitrator, decides whether the Act applies, even if the contract has a delegation clause. The Act applies to disputes or claims that arise or accrue on or after 3 March 2022.

If you are dealing with workplace harassment, our guide to the actions victims of sexual harassment can take sets out the wider options.

Can you opt out of an arbitration agreement?

Often you can, but only if the contract gives you that right and you use it on time. Many terms of service and some employment programmes include an opt-out window, such as 30 days from first accepting the terms, and specify exactly how to send notice. Some still require a signed letter by post.

If you want to opt out:

1. Find the arbitration section and read the opt-out paragraph in full.
2. Note the deadline and when it starts, for example from account creation or from the date you accepted updated terms.
3. Send notice using the exact method required, with your name, account details and a clear statement that you reject arbitration.
4. Keep proof: a copy of the notice and proof of posting or sending.

Opting out normally removes only the arbitration clause, so the rest of the contract stays in force. An opt-out right can also make a clause harder to challenge later, because a court may find that you had a real choice. Courts do look at whether that choice was genuine. In Circuit City Stores v. Mantor (2003), the Ninth Circuit found a clause procedurally unconscionable where the employee was pressured not to opt out, saying “A meaningful opportunity to negotiate or reject the terms of a contract must mean something more than an empty choice.”

If there is no opt-out clause, you can try to negotiate, but a business is generally free to refuse to deal with someone who will not sign. That is why it pays to read the dispute section before you accept, much as our guide to drafting a legally binding contract recommends for any agreement.

How do the UK and the EU treat consumer arbitration clauses?

Consumers in Europe have much stronger protection than in the US.

• England and Wales. Under section 91 of the Arbitration Act 1996, an arbitration clause in a consumer contract is unfair, and so not binding on the consumer, so far as it relates to a money claim that does not exceed a specified amount. The Unfair Arbitration Agreements (Specified Amount) Order 1999 sets that amount at £5,000. Above that figure, a clause can still be challenged under the general unfair terms rules, now in the Consumer Rights Act 2015. Separately, the Arbitration Act 2025, which came into force on 1 August 2025, updated the 1996 Act for arbitration generally.
• European Union. The Unfair Contract Terms Directive lists, as an example of a term that may be unfair, one that requires the consumer “to take disputes exclusively to arbitration not covered by legal provisions” (Annex, point 1(q)). The consumer ADR Directive goes further: under Article 10, an agreement made before a dispute arises to submit complaints to an ADR body cannot take away the consumer’s right to go to court.

In business-to-business contracts the picture is different. Commercial parties on both sides of the Atlantic are generally held to their arbitration clauses, which is why international trade relies on them.

What should you do if you want to challenge an arbitration clause?

Start by collecting the exact version of the terms you accepted and the date. Check whether your claim falls within an exception, such as sexual harassment or transportation work, and whether the business has already started court proceedings. Then look for unfair features: hidden terms, high fees, a very short time limit or a remedy you would get in court but not in arbitration. Courts treat employment law claims seriously here, and our overview of employment rights and laws explains the statutory claims involved.

Finally, do not ignore an arbitration demand or a motion to compel. Deadlines in both systems are short, and mediation can sometimes resolve the dispute before either process runs its course, as our piece on resolving disputes through mediation explains.

Frequently asked questions

Can I refuse to sign an arbitration agreement?

Yes, but the other side can usually refuse to hire you, open an account or do business with you. If the agreement is already signed, check for an opt-out window, which typically runs for a short period after you accept the terms and must be used exactly as the contract describes.

Are arbitration agreements enforceable in employment contracts?

Generally yes. In Epic Systems v. Lewis (2018) the Supreme Court upheld employment arbitration agreements with class and collective action waivers. Exceptions include sexual harassment and assault claims, transportation workers covered by section 1 of the FAA, and clauses that are unconscionable under state law.

Can an arbitration agreement stop a class action?

Usually. The Supreme Court held in AT&T Mobility v. Concepcion (2011) that the FAA overrides state rules treating class waivers as unconscionable. A waiver may fall if the whole arbitration clause is invalid, or under the 2022 law for sexual harassment and assault claims.

Who decides if an arbitration agreement is valid, a judge or the arbitrator?

It depends on the clause. A valid delegation clause can give that question to the arbitrator. But a court decides whether the 2022 sexual harassment law applies, and in Coinbase v. Suski (2024) the Court held that a judge decides which of two conflicting contracts governs.

What happens if I file in court despite an arbitration clause?

The business will normally ask the court to compel arbitration. If the court agrees and a party asks for a stay, it must pause the case rather than dismiss it, under Smith v. Spizzirri (2024). If the business waits too long and litigates instead, it may waive arbitration.

Are arbitration clauses in consumer contracts valid in the UK?

In England and Wales, not for small claims. Under section 91 of the Arbitration Act 1996, an arbitration clause in a consumer contract is unfair for money claims of £5,000 or less. For larger claims the clause can still be challenged under the unfair terms rules in the Consumer Rights Act 2015.

This article is general information about arbitration agreements and is not legal advice. Whether a particular clause is enforceable depends on its wording, the facts and the law that applies, so take advice from a qualified lawyer in your jurisdiction before relying on it.