Mandatory Auto Insurance: State Law, Not Federal

Mandatory auto insurance is a state law requirement; there is no federal mandate that forces every driver to carry coverage. Each state enacts its own statutes defining the minimum liability limits, proof‑of‑insurance procedures, and penalties for non‑compliance.

Why States Regulate Auto Insurance

States hold the primary authority over traffic safety and insurance regulation under the U.S. Constitution's police powers. This allows them to tailor coverage standards to local risk factors, such as population density and accident rates.

Common State Requirements

While specifics vary, most states require at least bodily injury liability coverage for drivers, with minimum dollar amounts ranging from $10,000/$20,000 to $25,000/$50,000. Some states also mandate personal injury protection (PIP) or uninsured motorist coverage.

Federal Influence Without a Mandate

The federal government influences auto insurance indirectly through legislation like the Motor Vehicle Safety Act and by setting standards for interstate commerce, but it does not impose a universal insurance requirement.

Variations Across States

Differences include:

• Minimum liability limits
• Whether PIP is required
• Proof‑of‑insurance documentation methods
• Penalty structures for violations

Table: Selected State Minimum Liability Limits