Idaho's Fault-Based System
Idaho operates under a fault-based auto insurance model, meaning the driver who caused an accident is financially responsible for damages. Unlike no‑fault states, the at‑fault party's liability coverage pays for the other driver's medical bills, property damage, and related losses.
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Required Liability Limits
State law mandates a minimum of 25/50/25 coverage: $25,000 per person for bodily injury, $50,000 per accident for bodily injury, and $25,000 for property damage. Drivers can purchase higher limits for greater protection, especially if they own high‑value assets.
How Fault Is Determined
Police reports, witness statements, and evidence such as photos or dash‑cam footage are used to assign fault. Idaho follows a comparative negligence rule: if the injured party is found partially at fault, their compensation is reduced proportionally. A driver who is 30% responsible will receive 70% of the claim amount.
Claim Process in an At‑Fault State
When an accident occurs, the non‑responsible driver files a claim with the at‑fault driver's insurer. The insurer investigates, assesses damages, and negotiates a settlement. If a dispute arises, the injured party may file a lawsuit to recover the remaining amount.
Uninsured/Underinsured Motorist Coverage
Because Idaho drivers can be held liable for damages exceeding their policy limits, many carriers recommend adding uninsured/underinsured motorist (UM/UIM) coverage. This protects you if the at‑fault driver lacks sufficient insurance.
Key Differences From No‑Fault States
In no‑fault states, each driver's own insurance covers medical expenses regardless of fault, typically through personal injury protection (PIP). Idaho's system requires the at‑fault driver's liability coverage to pay, which can lead to longer negotiations but often results in full compensation for the injured party.
Cost Considerations
Premiums in Idaho are influenced by factors such as driving record, vehicle type, mileage, and credit score. Adding higher liability limits or UM/UIM coverage raises costs but reduces financial risk.
Table: Comparison of Coverage Options
| Coverage | Minimum Limit | Typical Add‑On Cost |
|---|---|---|
| Liability (Bodily Injury/Property) | 25/50/25 | $0–$150 per year |
| Uninsured/Underinsured Motorist | Same as liability | $75–$200 per year |
| Comprehensive/Collision | Optional | $200–$500 per year |