How a Personal Injury Lawsuit Works: Filing, Discovery, and Trial

A personal injury lawsuit works in stages: you get medical treatment and gather evidence, your attorney sends a demand to the at-fault party’s insurer, and if that negotiation fails, a complaint is filed in civil court. From there the case moves through discovery, more settlement talks (often with a mediator), and only then to trial. Most cases never reach a courtroom. Understanding how a personal injury lawsuit works matters because the choices you make early — when to treat, when to sign, when to sue — shape what you can recover and how long it takes to get there.

Before Any Lawsuit Is Filed

The lawsuit is the last stage, not the first. Almost every personal injury case begins as an insurance claim and stays there.

Medical care comes first, for two reasons. Your health is one. The other is that the records and bills generated by that treatment become the core evidence of what happened to you and what it cost.¹

An attorney is usually brought in during this early period, most often on a contingency fee — the lawyer gets paid a percentage of the recovery only if the case succeeds, and nothing if it doesn’t.¹ The attorney then works up the facts: police reports, witness statements, photographs, and medical documentation. When the investigation is complete, a demand letter goes to the at-fault party’s insurance carrier setting out the injuries, the evidence of fault, and the total damages claimed.²

Negotiation follows. If the two sides can agree on a number here, the case ends without a lawsuit ever being filed. That is the outcome in the majority of claims.

When a Lawsuit Actually Becomes Necessary

An insurance claim and a lawsuit are two different things. A claim is a request for payment handled by an adjuster, resolved through negotiation, and never touches a courtroom. A lawsuit is a formal proceeding in civil court governed by procedural rules and decided by a judge or jury.³

Most people start with the claim because it is faster and cheaper. Filing suit becomes necessary when the insurer denies the claim outright, disputes who was at fault, or offers a settlement that doesn’t come close to covering actual losses. Policy limits can also push a case into court when damages exceed the coverage available.¹

There is also a hard outside deadline. Every state sets a statute of limitations on personal injury claims. Miss it and the right to sue is gone. Deadlines range from one year in Kentucky and Tennessee to six years in Maine and North Dakota, with two years being the most common window and applying in California, Texas, Florida, Pennsylvania, and more than two dozen other states. Certain circumstances can pause the clock, such as when the injured person is a minor or when the injury wasn’t discovered right away. Claims against government agencies typically involve even shorter notice deadlines, and a missed notice can bar the whole lawsuit.⁴

Filing the Complaint

The lawsuit begins when your attorney files a complaint in civil court. The complaint identifies the parties, states the legal claims, describes the facts behind those claims, and specifies the compensation being sought. It is paired with a summons, which notifies the defendant of the suit and sets a deadline for a response.⁵

Where the complaint gets filed matters. The court must have jurisdiction, and the venue is usually the county where the defendant lives, where the defendant does business, or where the accident happened.⁶

Once the defendant is served, they have a set number of days to file an answer. That answer typically admits or denies each allegation and raises any defenses. From this point forward, both sides are operating under the court’s schedule.

Discovery: Where the Case Actually Gets Built

After the pleadings are exchanged, the case enters discovery. This is where both sides trade evidence and information, and it is usually the longest phase of a personal injury lawsuit. Discovery exists to prevent surprises at trial and to let each side measure the strength of the other’s case. It commonly takes several months, and complex cases can stretch it past a year.²

Four tools do most of the work in discovery:

Interrogatories, which are written questions the other side must answer under oath.
Requests for production of documents, which demand items like medical records, financial statements, and emails.
Requests for admissions, which ask the other side to confirm or deny specific facts so they don’t have to be proved at trial.
Depositions, in-person testimony given under oath and recorded by a court reporter.¹

Expect to be deposed if you are the plaintiff. Expect the defense to ask you to attend an independent medical examination, conducted by a doctor chosen and paid for by the defense, who will write a report that typically questions the severity of your injuries or attributes them to something other than the accident. Refusing usually results in the court limiting or dismissing your claims.⁷

Settlement Talks and Mediation

Filing a lawsuit doesn’t shut down negotiations. Settlement discussions usually continue throughout discovery and can keep going even after a trial has started. In many cases the parties bring in a mediator — a neutral third party who helps both sides work toward an agreement. The mediator has no power to decide the case or impose a number; the parties keep control over whether to accept any proposal.²

The numbers show why this stage matters so much. Estimates put the share of personal injury cases that settle without a trial at 95% to 97%.⁸ If you are picturing a courtroom drama, adjust: the far more likely ending is a signed settlement agreement and a check.

Trial

When no settlement is reached, the case proceeds to trial. A personal injury trial moves through a set sequence: jury selection (called voir dire), opening statements from each side, presentation of evidence and witness testimony with cross-examination, closing arguments, jury instructions from the judge, and finally deliberation and a verdict.⁹

The plaintiff carries the burden of proof under the “preponderance of the evidence” standard. That means showing it is more likely than not that the defendant is responsible for the harm.¹⁰ Jury size and the number of jurors needed to agree on a verdict vary by state. If the jury can’t reach the required agreement, the judge may declare a mistrial, which means the case may have to be tried again.

After the Verdict: Motions and Appeals

A verdict doesn’t always end a case. The losing party can file post-trial motions in the same court, including a motion for a new trial or a motion for judgment notwithstanding the verdict, which argues that no reasonable jury could have reached the result it did. In some states these motions must be filed within as few as ten days of the verdict, so the window is short.¹¹

Either side can also appeal. An appeal is not a second trial. It asks a higher court to review the record for legal errors such as improper jury instructions, wrongful admission or exclusion of evidence, or a damages award that was excessive or inadequate. In California, a party who thinks the damages figure was too high or too low must file a motion for a new trial in the trial court first, or lose the right to challenge that figure on appeal.¹² Appeals can add years to a case.

How Long the Whole Process Takes

There is no fixed timeline. What the case is worth, how contested liability is, and how quickly you heal all move the numbers.

Simple car accident claims with clear fault and minor injuries can resolve in four to nine months without any lawsuit at all. Serious accident cases that enter the lawsuit process commonly take one to two years. Medical malpractice cases often run two to five years.¹³

For cases that go all the way through trial, the average time from filing to verdict is roughly 25.6 months, not counting appeals or post-trial motions.⁸

Common sources of delay include waiting for you to reach maximum medical improvement (the point at which your condition has stabilized enough for the claim to be valued accurately), disputes over fault, insurance-carrier tactics designed to pressure plaintiffs into taking less, and court scheduling backlogs.¹³ Settling before reaching maximum medical improvement is risky because you may not yet know what your long-term costs will be.

What You Actually Take Home

The gross settlement or verdict is not what you keep. Three things come out of it: attorney’s fees, case expenses, and liens.

Attorney’s Fees and Case Costs

Most personal injury lawyers work on contingency: nothing upfront, and a percentage of the recovery only if the case succeeds. According to the American Bar Association, contingency fees typically run from 33% to 40% of the recovery.¹⁴

The order of operations matters. Whether the attorney takes the percentage before or after case expenses are deducted meaningfully changes your check. On a $100,000 recovery with $20,000 in expenses and a one-third fee, you would net about $46,667 if the fee is calculated first and about $53,334 if expenses come off first.¹⁵ Case expenses include court filing fees, expert witness fees, investigation costs, and medical record retrieval charges. If the case is lost, whether you owe those expenses back depends on the retainer agreement.¹⁴

Liens and Reimbursement Rights

Health insurers, government programs, and medical providers may have the right to be paid back from your settlement for injury-related expenses they already covered.

Medicare treats its payments for accident-related care as conditional and must be repaid from any settlement, though its recovery is reduced proportionally by your attorney’s fees and litigation costs.¹⁶ Medicaid programs in many states can assert liens against the medical-expense portion of a settlement. Workers’ compensation carriers have statutory subrogation rights when a third party caused a workplace injury. Private health insurance plans, particularly employer-sponsored plans governed by the federal ERISA statute, can assert reimbursement rights based on plan language, and those rights may override state laws that would otherwise block subrogation.¹⁷ These claims need to be identified and negotiated before the settlement is distributed.

Taxes

Under Internal Revenue Code Section 104(a)(2), compensation received for personal physical injuries or physical sickness is excluded from federal income tax. That applies whether the money arrives as a lump sum or as periodic payments through a structured settlement.¹⁸

The exemption has limits. Punitive damages are taxable even when the underlying case involved a physical injury. Damages for purely emotional harm unrelated to a physical injury are generally taxable as well. When a settlement agreement doesn’t allocate the payment by category, the IRS looks at the circumstances and the paying party’s intent to decide how to classify it.¹⁸

How Fault Sharing Can Reduce What You Recover

If you were partly responsible for your own accident, your recovery can be reduced or in some states eliminated entirely. The rule depends on the state.

In Alabama, Maryland, North Carolina, Virginia, and the District of Columbia, contributory negligence still applies: if you are even 1% at fault, you recover nothing.¹⁹

Most states use some form of comparative negligence, which reduces your award by your share of fault instead of erasing it. Pure comparative negligence lets you recover even if you were 99% at fault, with the award reduced accordingly; California, New York, and Washington follow this rule. Under a 51% bar (Texas, Ohio, Illinois, Pennsylvania), you can recover only if your share of fault does not exceed 50%. Under a 50% bar (Georgia, Colorado, Kansas), your fault must be less than 50%.¹⁹ As a concrete example, a $100,000 award reduced for 10% plaintiff fault under a comparative system becomes $90,000.

When the Process Looks Different

Two situations change how a personal injury lawsuit works in ways worth knowing about before you file.

Suing a Government Entity

A case against a city, county, or state agency is not the same as a case against a private party. Sovereign immunity is the default: the government cannot be sued without its consent, and states waive that immunity only to the extent they choose.

Florida waives tort immunity but caps damages at $200,000 per person and $300,000 per incident. Awards above those caps can only be paid through a special act of the legislature.²⁰ Pennsylvania limits damages against the state to $250,000 per plaintiff and $1,000,000 per occurrence, and waives immunity only for specific categories of negligence such as vehicle liability, medical malpractice, and highway defects.²¹ At least 33 states cap recoveries against the government, and at least 29 prohibit punitive damages against government defendants entirely. Notice requirements are strict, and missing one can bar the lawsuit completely.²²

Mass Torts and Multidistrict Litigation

When a defective product, dangerous drug, or environmental disaster injures many people, the case may not proceed as a standalone lawsuit at all. In a class action, one or a few representative plaintiffs sue on behalf of a larger group, one trial binds every member, and any settlement is typically distributed on a uniform basis. Class actions fit cases where individual damages are small and the harm is similar across the group.²³

Multidistrict litigation, created by a 1968 federal statute, consolidates lawsuits sharing common factual questions into a single federal court for pretrial proceedings. Each plaintiff keeps their own attorney and their own case. The MDL judge handles shared discovery and pretrial motions, and “bellwether” trials of representative cases are used to test theories and establish a range of likely outcomes. Fewer than 3% of MDL cases return to their original courts for individual trials; most settle based on the bellwether results.²³

If you have a viable personal injury claim, the practical next step is the one at the top: get treatment, then talk to a lawyer well before the statute of limitations in your state runs out. Everything else — the demand, the filing, the discovery, the settlement, and the rare trial — flows from those first two steps.

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