Legal Injury GuidePrejudgment Interest in Personal Injury Cases: How It Works and Why It Changes Settlement Math
A deep explanation of prejudgment and post-judgment interest in injury cases: why it exists, how states differ, which damages it may apply to, and how it affects settlement timing.
Personal injury cases can take years. During that time, an injured person may carry medical debt, lose income, and wait for compensation that a jury later decides was owed from the start. Prejudgment interest is one way the law addresses that delay. Whether it applies, how much, and from when depends heavily on the state. This guide explains the concepts so you can ask the right questions. It is general information, not legal advice.
Two kinds of interest
- **Prejudgment interest** covers the period before a court enters judgment, often measured from the date of injury, the date a claim was made, or the date a lawsuit was filed.
- **Post-judgment interest** covers the period after judgment until the judgment is paid. It is common across jurisdictions. In federal court it is governed by 28 U.S.C. section 1961 and tied to a Treasury yield; state courts use their own statutory rates.
Why prejudgment interest exists
The idea is that money has time value. If an injured person was owed compensation on the date of harm, a defendant who delays payment for years keeps the benefit of that money. Interest is meant to make the injured person whole for the delay and to remove an incentive to stall.
How states differ
Approaches vary widely and can change, so the law of the relevant state should be checked:
- **Broad availability.** Some states add interest to most or all damages from an early date.
- **Economic damages only.** Some allow interest on past economic losses, such as medical bills and lost wages, but not on non-economic damages like pain and suffering, or not on future damages.
- **Offer-based rules.** Some tie prejudgment interest to settlement offers, for example awarding it only if the final judgment exceeds a formal offer the defendant rejected.
- **Not available for unliquidated damages.** Some states do not allow prejudgment interest on personal injury damages that were uncertain in amount until trial.
- **Different start dates and rates.** The trigger date and statutory rate can differ significantly, and some states use a fixed rate while others use a market-linked rate.
Which damages it may apply to
When interest is allowed only on some categories, the verdict form may separate past medical expenses, past lost income, future losses, and non-economic damages. That separation can significantly change the total. Future damages are usually reduced to present value instead, so adding interest to them would double-count.
Effect on settlement strategy
Even though interest is applied to judgments rather than settlements, it can shape negotiation:
- **Pressure to settle.** In states with substantial prejudgment interest, every month of delay may increase the defendant’s exposure if the case goes to verdict.
- **Formal offers.** Offer-of-judgment or offer-of-settlement rules can shift interest or costs depending on whether the final result beats a written offer. These rules are technical, with strict timing and format requirements.
- **Policy limits.** An insurer’s duty to protect its insured can be implicated if interest pushes a likely verdict above policy limits, which can matter in bad-faith analysis in some jurisdictions.
Practical questions to ask
- Does the state where the case would be tried allow prejudgment interest on personal injury damages?
- From what date does it run, and at what rate?
- Does it apply to all damages or only certain categories?
- Is it affected by settlement offers?
- How does it interact with liens and attorney fees in the final net calculation?
A simple illustration
Imagine a verdict where a portion of the award is past economic loss. If the state applies a statutory rate to that portion from the date of the claim, several years of interest can add a meaningful amount. If the state does not allow interest on that category, the same verdict produces a smaller judgment. Understanding which rule applies helps explain why two similar cases in different states can settle for very different numbers.
Bottom line
Prejudgment interest is not a bonus; it is compensation for delay, and its availability depends entirely on the jurisdiction. Knowing the rule helps you understand the real value of waiting for trial versus settling, and why formal offers and timing can matter as much as the facts.
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Frequently Asked Questions
What is prejudgment interest?
It is interest added to a damages award for the period before judgment, intended to compensate for the time the injured person went without money they were owed. Whether and how it applies depends on state law.
Does every state allow prejudgment interest in injury cases?
No. Some allow it broadly, some limit it to certain damages or certain periods, some tie it to settlement offers, and some do not allow it for unliquidated personal injury damages at all.
Is a settlement the same as a judgment for interest purposes?
Usually not. Statutory interest normally applies to judgments. A settlement amount is negotiated, though the risk of interest accruing on a future judgment can influence what the defense is willing to pay.
For informational purposes only. Not legal advice. Consult a licensed attorney.