New Hampshire Car Accident Laws

New Hampshire is genuinely unique here: it's the only US state that doesn't require drivers to carry auto insurance. Drivers who cause a crash without insurance are personally liable for the full cost — the obligation doesn't disappear, it just isn't insured against by default.

Every other state requires proof of insurance before you can legally drive. New Hampshire asks only that you're able to pay if something goes wrong — insurance is simply the most common way people do that.

Statute of limitations: 3 years

Under N.H. Rev. Stat. §508:4, you generally have three years from the date of the accident to file a personal injury or property damage lawsuit.

Fault rule: modified comparative negligence, 51% bar

Under N.H. Rev. Stat. §507:7-d, you can recover damages if you're found 50% at fault or less, reduced by your percentage. At 51% or more, you recover nothing. New Hampshire also caps total personal injury liability at the greater of $475,000 per person / $3,750,000 per incident, or the available insurance proceeds — worth knowing if a serious crash is involved.

Insurance: New Hampshire's unique no-mandatory-insurance rule

New Hampshire is the only US state that doesn't legally require drivers to carry auto liability insurance. Instead, the state's Financial Responsibility Law requires drivers to be able to pay for damages they cause — in practice, most drivers still carry insurance, but a driver who causes a crash without it is personally liable for the full cost, with no insurer standing behind them.

How this plays out in a real claim

Take an intersection collision where fault is genuinely disputed. If an insurer or court assigns you 40% of the blame, New Hampshire's rule still lets you recover 60% of your damages, and even at exactly 50% you still recover half. But at 51% or more, the claim is barred entirely — not reduced, eliminated. That one-point difference between 50% and 51% is exactly why insurers have a real incentive to push a borderline case just over the line rather than simply discount what they pay.

A mistake worth avoiding in New Hampshire

Because a single percentage point at the 51% threshold can be the entire difference between a reduced payout and nothing at all, careless statements at the scene or to an adjuster carry more weight here than in a pure comparative state. Avoid speculating about fault, even casually, until the full picture — police report, witnesses, any available footage — is in front of you.

If a government vehicle or agency was involved

Claims against New Hampshire state agencies require written notice within 180 days of the injury, and the claim itself must be brought within three years (RSA 541-B:14). Damages are capped at the greater of $475,000 per person or $3,750,000 per incident against the state, and $325,000 per person / $1,000,000 per incident against a local government (RSA 507-B:4) — a meaningful ceiling given New Hampshire is also the only state with no mandatory auto insurance requirement.

If the crash resulted in a death

New Hampshire gives an unusually long six years from the date of death to bring a wrongful death claim (RSA §556:11) — far longer than the three-year deadline for an ordinary injury claim in this state. A 2024 law significantly raised the state's damages caps effective January 1, 2025: a surviving spouse's loss-of-companionship damages rose from $150,000 to $500,000, and the per-child cap for loss of familial relationship rose from $50,000 to $300,000 per claimant. Filing is also unusually open: RSA §556:19 lets any person with a legal interest in the estate bring the claim, not just a court-appointed representative.

Beyond the deadline and the fault rule

The statute of limitations and the fault rule above decide whether you have a claim and how much of it survives — they don't decide what the claim is actually worth, or whether it's worth handling yourself. For that, see our guides on what affects a settlement, who pays your medical bills while a claim is pending, and whether New Hampshire law makes a lawyer worth it for your specific situation.

When it's worth talking to someone

Given the real possibility that the other driver in New Hampshire has no insurance at all, checking your own UM/UIM coverage before an accident — and getting advice quickly after one — is genuinely worth doing.