How does a class action lawsuit work? Start to finish

How does a class action lawsuit work? The 8 stages at a glance

Every class action follows the same arc, whether it's about hidden delivery fees or a 100-million-record data breach. The durations below are typical ranges for consumer cases in U.S. courts; securities and antitrust cases often run longer.

Stage 1–2: the complaint, the motion to dismiss and discovery

A class action starts like any lawsuit: one or more people — the lead plaintiffs — file a complaint, except that it's written on behalf of "all persons similarly situated." The lawyers work on contingency, so class members never pay them directly. Larger consumer cases usually land in federal court under the Class Action Fairness Act, which lets defendants move most multi-state class actions with more than $5 million at stake into federal court.

The defendant's first move is almost always a motion to dismiss, and this is where a lot of cases die quietly. A second common exit is arbitration: if your terms of service contain an arbitration clause with a class-action waiver, the company asks the judge to send everyone to individual arbitration instead. Cases that survive both move into discovery — document exchanges, depositions and expert reports — which is the slowest stretch of the whole process and frequently takes a year or more.

Stage 3: class certification

Certification is the hinge of the case. The plaintiffs move to certify a class, and the judge applies Rule 23's tests — numerosity, commonality, typicality and adequacy, plus predominance and superiority for damages classes (see what a class action lawsuit is for each test in plain English). If certification is denied, the case usually collapses into a handful of individual claims; if it's granted, the defendant's exposure suddenly multiplies by the size of the class, which is why settlement talks tend to get serious right afterwards. Either side can ask an appeals court to review the certification decision within 14 days under Rule 23(f).

Many consumer cases skip a contested certification fight entirely: the parties negotiate a deal and ask the court to certify a settlement class at the same time as it reviews the settlement. Our guide to what happens after a class action is certified covers the post-certification path in detail.

Stage 4–5: settlement and preliminary approval

The overwhelming majority of certified class actions settle rather than go to verdict — trials are expensive, slow and risky for both sides (settlement vs. trial verdict explains why). A settlement agreement sets the fund (say, $92 million in the TikTok privacy settlement), the class definition, how money is divided (flat payments, pro rata shares, documented-loss tiers), the attorneys' fee request, and the release — the legal claims class members give up in exchange.

Under Rule 23(e) a class settlement needs court approval, and it happens in two steps. Preliminary approval means the judge has reviewed the deal, found it likely to be approved, and authorized notice to the class. This is the moment a settlement website goes live and claims open — which is why you'll see settlements described as "pending" or "awaiting final approval" while you're already filing. Federal law also requires the defendant to notify state and federal officials, and the court can't grant final approval until at least 90 days after that notice. If you're looking at a settlement in this stage, read what 'awaiting approval' means before you decide to wait.

Stage 6: notice and the claims period — where you come in

Rule 23(c)(2)(B) requires "the best notice that is practicable," including individual notice to everyone who can be identified with reasonable effort, by mail, email or other appropriate means. In practice that means postcards, emails from the administrator's domain, banner ads, and sometimes court-approved text messages or in-app notices — and in data-breach cases like the Bank of America settlement, a mailed letter to everyone whose records were exposed. The notice has to tell you four things you can do:

• File a claim — the only way to get paid, by the claims deadline (typically 90–120 days after notice).
• Opt out (request exclusion) — you get nothing from the settlement but keep the right to sue on your own; the deadline is usually a few weeks before the claims deadline. See what opting out means.
• Object — stay in the class but tell the judge why the deal is unfair.
• Do nothing — you stay bound by the settlement and, in most cases, get nothing.

If you've received a notice, here's the short version of what to do:

1. Verify it. Find the official settlement website (it's printed on the notice) and confirm the case exists on the administrator's site or ClassAction.org. Never pay a fee.
2. Check you fit the class definition — product, place, dates. Our guide on how to check if you're part of a class action walks through it.
3. File before the deadline, using the claim or notice ID from your postcard if you have one. How to file a class action claim covers every field.
4. Save the confirmation and set a reminder for the final approval hearing date listed on the site.

Stage 7–8: fairness hearing, final approval and payment

After the claims deadline the judge holds a fairness hearing, considers objections and the fee request, and — if satisfied the deal is fair, reasonable and adequate — grants final approval. That ruling is a judgment, and it can be appealed; a single objector's appeal can freeze payments for a year or more. Once appeals are exhausted (or the appeal window passes), the settlement reaches its effective date, the defendant funds the account, and the administrator calculates each claimant's share — reviewing claims, rejecting duplicates and fraud, and sending deficiency notices where something's missing.

Realistic expectations: most people are paid 3–18 months after the claims deadline, with the fastest flat-payment settlements landing in a few months and contested ones dragging past two years. Payment arrives as a check, a prepaid card, or a digital transfer (PayPal, Venmo, Zelle, direct deposit) depending on what you chose on the claim form — see how long it takes to get a settlement check for what delays it.

What all this means for you, in practice

Strip away the procedure and the class member's job is tiny: notice when a settlement covers you, file a claim inside the window, and keep your contact details current so the payment reaches you. The hard part is the first step, because notice reaches far fewer people than the courts intend — the FTC's study of 149 settlements found a median claims rate of only 9%. Two practical fixes: check the open settlements directory every month or two, or let Owed match you against open settlements with a 9-question quiz, pre-fill the forms, and remind you before each deadline — free, with no cut of what you're paid.

This article explains the process in general terms and isn't legal advice. If you have large individual losses — a totaled car, thousands in unauthorized charges — the notice stage is also when you should consider whether opting out and hiring your own lawyer makes more sense than the class payout.

Glossary

Complaint

The document that starts the lawsuit, describing what the defendant did and who the proposed class is.

Class certification

The court's ruling that the case may proceed on behalf of a defined group because it satisfies Rule 23.

Preliminary approval

The judge's first-look approval of a settlement, which triggers notice to the class and opens the claims period.

Fairness hearing

The court hearing, after the claims deadline, where the judge considers objections and decides whether to grant final approval.

Final approval

The court order declaring the settlement fair, reasonable and adequate and binding the class; it can be appealed.

Effective date

The date when a settlement becomes final (appeals exhausted) and the administrator can start paying claims.

FAQ