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General information only — not legal advice. Published by Edward & Amaury Solicitors, solicitors regulated by the SRA (no. 800525). How that affects what you read.

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Class Action Requirements and Opt-Out Rights

United States (federal and general)Last reviewed 18 September 2026

A federal class action needs a class so large that joining everyone is impractical, common questions, typical claims and adequate representatives. For damages classes, members must generally get notice and can opt out, and the court must approve any settlement as fair, reasonable and adequate.

What a Class Needs

Direct Answer: Rule 23(a) requires that the class is so numerous that joinder is impracticable, that there are common questions, that the representatives' claims are typical, and that they will fairly and adequately protect the class.

For a class seeking damages, Rule 23(b)(3) adds that common questions must predominate over individual ones, and that a class action must be superior to other ways of resolving the dispute. A judge decides whether to certify the class, and many cases turn on that decision.

Notice and Opting Out

In a damages class action, the court must direct the best notice practicable, including individual notice to members who can be identified with reasonable effort. The notice must explain the time and manner to request exclusion. If you opt out, you keep the right to sue on your own, but you do not share in the class recovery. If you do nothing, you are usually bound by the outcome.

Settlements

Under Rule 23(e), the court must approve a class settlement after finding it fair, reasonable and adequate, considering factors such as how well the class was represented, whether it was negotiated at arm's length and whether relief is adequate. Attorney fees in class cases are typically subject to court approval as well, so read the notice for the details.

Frequently Asked Questions

What is required for a federal class action?

Numerosity, commonality, typicality and adequate representation, plus, for damages classes, predominance and superiority.

Can I opt out of a class action?

In a damages class action, yes. You must follow the process in the notice by the stated deadline, and you then keep the right to sue individually.

What happens if I do nothing?

You are usually treated as a class member and bound by the judgment or settlement, and may be entitled to share in any recovery.

Who approves a class settlement?

The court, which must find it fair, reasonable and adequate.

Do state courts follow the same rules?

Each state has its own class action rules, which may differ from the federal Rule 23.

Can I get a class action lawyer without paying upfront?

Often, yes. Many attorneys handling these cases work on contingency or fee-shifting arrangements, so you pay no hourly fees upfront, but the terms and the treatment of case costs are set out in a written agreement. Read it before you sign and ask how costs are handled.

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How Contingency Fees Work

From free consultation to settlement

Read more

Where this applies: Contingency fee rules are set state by state. Check your own state's rules before acting.

Sources for this page

Every rule stated above is based on the primary sources below. Each link goes to the legislation, court rule or regulator itself so you can check it. Last verified 18 September 2026.

  1. ABA Model Rule 1.5 (Fees)

    Model, not law. Each state adopts its own version. Rule 1.5(d) bars contingency fees in most domestic relations matters and in criminal defence.

  2. Cornell LII — contingency fee
  3. Federal Rule of Civil Procedure 23 — Class actions

    A class needs numerosity, commonality, typicality and adequate representation; a damages class also needs predominance and superiority, with notice and a right to opt out, and court approval of any settlement as fair, reasonable and adequate.

Who wrote and checked this page

Written and published by
Edward & Amaury Solicitors (Edward & Amaury Ltd, company no. 12195443), regulated by the Solicitors Regulation Authority under no. 800525.
Legal review
This page has not yet been through independent legal review. It is written from the primary sources listed below, which you can check directly.
Review dates
Last reviewed 18 September 2026. Next review due 18 March 2027.

Fee rules change. California’s medical malpractice fee limits changed on 1 January 2023, and the QOCS rules in England and Wales changed on 6 April 2023. If you spot something out of date, tell us — we publish corrections.

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Where this applies: Contingency fee rules are set state by state. Check your own state's rules before acting.

Sources for this page

Every rule stated above is based on the primary sources below. Each link goes to the legislation, court rule or regulator itself so you can check it. Last verified 2 August 2026.

  1. ABA Model Rule 1.5 (Fees)

    Model, not law. Each state adopts its own version. Rule 1.5(d) bars contingency fees in most domestic relations matters and in criminal defence.

  2. Cornell LII — contingency fee
  3. Federal Rule of Civil Procedure 54(d) (costs to the prevailing party)

    A losing plaintiff may be ordered to pay the defendant's taxable costs. There is no US equivalent of QOCS.

Who wrote and checked this page

Written and published by
Edward & Amaury Solicitors (Edward & Amaury Ltd, company no. 12195443), regulated by the Solicitors Regulation Authority under no. 800525.
Legal review
This page has not yet been through independent legal review. It is written from the primary sources listed below, which you can check directly.
Review dates
Last reviewed 2 August 2026. Next review due 2 February 2027.

Fee rules change. California’s medical malpractice fee limits changed on 1 January 2023, and the QOCS rules in England and Wales changed on 6 April 2023. If you spot something out of date, tell us — we publish corrections.