Only when your assigned fault exceeds 50 percent does Montana bar UM hit-and-run recovery. The insurer must shift a clear majority of blame to you before it can deny the claim.
How the 51-Percent Fault Bar Works in Hit-and-Run UM Claims
States with a 51-percent fault bar give hit-and-run UM claimants a slightly wider margin than 50-percent-bar states. You can be assigned exactly half the fault and still recover. But that margin should not create complacency. Your insurer benefits from pushing your fault share as high as possible, and exceeding the halfway mark eliminates the claim entirely. In a hit-and-run, evidence gaps work in the insurer's favor because the other driver is unavailable to confirm or deny any version of events. Building your own evidence record is the primary way to control the fault narrative.
Building Evidence to Stay Below the 51-Percent Bar After a Hit and Run
The 51-percent fault bar gives you more room than a 50-percent-bar state, but you still need evidence to hold the line. Document the crash scene thoroughly -- photographs, dashcam footage, and witness statements form the foundation of your fault defense. Pay attention to details that show the phantom driver's conduct: tire marks from aggressive acceleration, debris patterns indicating the other vehicle crossed into your lane, and impact angles that match your account. Your insurer's adjuster will examine these same details with a different objective, so make sure your documentation is complete and internally consistent.
A worked example with Montana’s rule applied
Take a hit and run claim with documented losses like these:
| Medical bills | $8,400 |
| Lost wages | $1,900 |
| Other out-of-pocket costs | $1,150 |
| Pain and suffering (2.5× medical) | $21,000 |
| Gross value before fault | $32,450 |
Under Montana’s 51% bar, percentages behave like a cliff edge. At 50% fault this claim still pays $16,225; at 51% it pays $0. One percentage point moves $16,225, which is why the fault number in the adjuster’s file is worth arguing about with evidence, not estimates.
Filing a UM Claim After a Hit and Run: What Your Insurer Will Not Tell You
A hit-and-run UM claim puts you in the unusual position of negotiating against your own insurance company. The insurer holds your policy, collects your premiums, and now decides how much to pay your claim. That arrangement creates a built-in conflict. The adjuster evaluates your medical records, reviews the police report, and constructs a valuation -- but the goal is to reach the lowest defensible number. Your leverage comes from thorough evidence: complete medical documentation, proof of wage loss, and a clear record of the crash that supports your version of events. If the insurer's offer falls short, most UM policies provide for arbitration rather than a traditional lawsuit as the dispute mechanism.
Before you rely on any number here
This page is general information, not legal advice. Nothing on hitandrunlawyer.us creates an attorney–client relationship, and no estimate produced by the calculator is a valuation, a prediction or an offer.
HitAndRunLawyer.us is an independent informational website operated by Mustafa Bilgic, an individual who is not a licensed attorney and does not run a law firm. We do not accept cases, review documents, negotiate with insurers or refer you to a particular lawyer.
Deadlines, fault rules, damage caps and insurance requirements differ by state and change over time, and a missed deadline can end a valid claim permanently. Consult a licensed attorney in your state before you accept, reject or file anything. To find one independently, use your state bar’s referral service or the American Bar Association’s Find Legal Help directory.
Questions
Montana questions
Does equal fault bar my hit-and-run UM claim in Montana?
No. Montana uses a 51-percent comparative fault bar, so equal fault -- 50 percent -- does not block your claim. You lose recovery only when your assigned fault exceeds 50 percent. At the even split, you still receive a proportionally reduced payout from your carrier.
How does Montana's 51-percent bar differ from a 50-percent bar in a hit-and-run UM claim?
The difference is one percentage point at the threshold. Under a 50-percent bar, reaching exactly half fault eliminates your claim. Under Montana's 51-percent standard, you must exceed half. That additional point of margin can be decisive when the insurer's fault assignment lands near the line.
What can I do if my UM insurer assigns me close to 51 percent fault in Montana?
Challenge the fault assignment with evidence. Dashcam footage, scene photographs, witness testimony, and the police report all contribute to the fault calculation. If the insurer's assignment relies on assumptions rather than documented facts, raise that during negotiations. Consulting an attorney before accepting the assignment is advisable when the percentage sits near the threshold.
- Sources: state comparative-fault statutes · Insurance Information Institute · Bureau of Labor Statistics · IRS Pub. 4345 · NHTSA
- Last reviewed 2026-08-25. Statutes, caps and fault rules change — re-check anything time-sensitive with a licensed attorney.