You get hurt on the job. Your employer’s workers’ compensation insurance pays your medical bills and a portion of your lost wages. That’s the deal – you trade your right to sue your employer for no-fault benefits. But here’s the catch: that trade only applies to your employer and, in most cases, your coworkers. If someone else caused your injury, you may have a separate, full-blown personal injury claim against them. That’s called a third-party liability claim, and it can mean the difference between scraping by on workers’ comp and getting full compensation for your pain, suffering, and long-term losses.

Let’s be clear about how workers’ comp works. It’s a no-fault system. You don’t have to prove your employer was careless. You just have to show you were injured in the course of your work. In exchange, you get medical treatment and a percentage of your usual paycheck – typically around two-thirds in most states – but you get nothing for pain and suffering, emotional distress, or loss of enjoyment of life. The benefits are modest by design. They’re meant to keep you afloat while you recover, not to make you whole. And if your injury leaves you permanently disabled, the payout is often far below what a jury would give you in a negligence case.

That’s where a third-party claim changes the game. Suppose you’re a construction worker on a project site. A crane owned by a rental company, not your employer, drops a load on you. The crane company had a duty to maintain its equipment. They didn’t. That’s negligence. Or imagine you’re a warehouse employee and a pallet collapses because of a defect in the manufacturer’s design. The manufacturer is on the hook. Or you slip on a wet floor in a customer’s facility while making a delivery – the property owner failed to put up a warning sign. In all these scenarios, someone other than your employer created the hazard that hurt you. That person – or company – is a third party, and you can sue them directly.

Why would you bother? Because a successful third-party claim can recover everything workers’ comp can’t: full past and future lost wages (not just a percentage), medical costs that workers’ comp caps or denies, and non-economic damages like chronic pain, disfigurement, and the inability to play with your kids. In a worst-case scenario, say a spinal injury leaving you paralyzed, workers’ comp might pay a few hundred thousand dollars total. A jury verdict against a negligent equipment manufacturer could be several million. That’s the real-world stakes.

Now, there’s a legal twist you need to understand. Workers’ comp insurers have what’s called a subrogation lien. This means if you settle a third-party claim, the insurer can demand repayment of what it already paid you for medical bills and lost wages. In many states, the workers’ comp carrier gets a portion of your third-party recovery – sometimes a hefty one, often around one-third or more. You don’t keep every dollar. But even after that deduction, you usually end up far ahead. The trick is that the lien only covers what the comp insurer actually paid. It doesn’t touch your pain and suffering damages. And you can often negotiate the lien down, especially if your lawsuit was risky or required significant attorney time.

Don’t think this is an easy road. Third-party claims are full-blown negligence cases. You have to prove duty, breach, causation, and damages. That means evidence, expert witnesses, and a lawyer who knows how to fight a corporation’s defense team. The third party will argue you were partially at fault. If you were, say, not wearing a hard hat and that contributed to your head injury, the jury can reduce your award by your percentage of fault. In a few states, if you’re found more than 50% at fault, you get nothing. Your own employer’s negligence – or even your own careless behavior – won’t do you any favors if you were also breaking safety rules.

Also, time is not on your side. Every state has a statute of limitations for personal injury claims. It’s usually two to three years from the date of injury, but some states have shorter deadlines for claims against government entities. Miss that deadline, and your claim is dead, no matter how strong it is. Workers’ comp claims have their own deadlines, but they’re different – and far more forgiving. Don’t assume that because your comp claim is pending, your third-party lawsuit can wait. It can’t.

What about the employer? Can you ever sue your employer directly? In nearly every state, no, so long as the employer has workers’ comp insurance. That’s the whole point of the system. But there are rare exceptions: if your employer intentionally harmed you, or if they removed a safety guard knowing you’d get hurt, some states allow a lawsuit. These are extremely hard to prove. For practical purposes, your employer is off-limits. Your focus should be on the person or company whose carelessness actually caused the hazard.

Here’s the bottom line. If you’re hurt at work, take your workers’ comp benefits. Don’t give them up. But do investigate whether anyone besides your employer contributed to the injury. Ask yourself: Was there defective equipment? A dangerous condition on someone else’s property? A negligent contractor? A truck driver who ran you over in the company lot? If the answer is yes, get a personal injury attorney immediately. They’ll protect your claim, deal with the comp lien, and negotiate the best possible settlement. The system is complicated, but the principle is simple: you shouldn’t have to bear the full cost of someone else’s carelessness just because you were at work.