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Why insurance is regulated by states, not Washington
How an 1869 court case and the 1945 McCarran-Ferguson Act left car insurance to the states, what federal law still reaches, and what that means for drivers.
Car insurance is regulated by the states because a federal law passed in 1945, the McCarran-Ferguson Act, says "the business of insurance" is subject to state law and that federal laws do not override state insurance laws unless they specifically say so. That is why your minimum coverage, your rights after a claim and the agency you complain to all depend on where you live. Federal law still reaches parts of car insurance, mainly through consumer-reporting, privacy and vehicle laws.
How it happened
1869: insurance is "not commerce." In Paul v. Virginia, the U.S. Supreme Court held that issuing an insurance policy was not a transaction of interstate commerce, so the federal commerce power did not reach it. For the next 75 years, states regulated insurance more or less on their own, and state regulators had already begun meeting together in 1871, the origin of today's NAIC.
1944: the Supreme Court reverses itself. In United States v. South-Eastern Underwriters Association, decided June 5, 1944, the Court held that insurance conducted across state lines is interstate commerce, subject to Congress and to the federal antitrust laws. Justice Black wrote that the Court "cannot make an exception of the business of insurance" (Cornell LII). That threw the state system into doubt, especially the practice of insurers pooling data to set rates.
1945: Congress hands it back. The McCarran-Ferguson Act, signed March 9, 1945, restored state primacy. Its core provision, 15 U.S.C. 1012, says:
- Insurance "shall be subject to the laws of the several States which relate to the regulation or taxation of such business."
- "No Act of Congress shall be construed to invalidate, impair, or supersede" a state insurance law "unless such Act specifically relates to the business of insurance."
- The Sherman Act, Clayton Act and Federal Trade Commission Act apply to insurance "to the extent that such business is not regulated by State Law."
States responded by passing the rating and unfair trade practices laws that still form the backbone of insurance regulation; see how car insurance rate approval works.
What the federal government does today
There is no federal insurance regulator for car insurance. The closest thing is the Federal Insurance Office, created in the Treasury Department by the Dodd-Frank Act of 2010. According to Treasury, it monitors the insurance sector, represents the U.S. internationally and advises the Financial Stability Oversight Council. It does not license insurers, approve rates or handle consumer complaints.
Federal laws that do touch your car insurance include:
| Federal law or agency | How it affects car insurance |
|---|---|
| Fair Credit Reporting Act | Covers the consumer reports insurers buy, such as a CLUE report, driving-record and credit-based reports. If an insurer takes adverse action based on one, it must tell you which agency supplied it, and you can get a free copy and dispute errors |
| Federal Trade Commission | Enforces consumer protection against companies outside state insurance regulation, such as its January 2026 order against GM and OnStar over selling driving data; see connected-car data, data brokers and your premium |
| Graves Amendment (49 U.S.C. 30106) | Shields rental and leasing companies from vicarious liability for renters' crashes unless the company itself was negligent or criminal |
| National Motor Vehicle Title Information System (28 CFR 25.55) | Requires insurers to report total-loss vehicles monthly for the current model year and four prior years, which feeds vehicle history reports |
| Federal antitrust law | Applies to insurers where states do not regulate the conduct, and to boycotts, coercion and intimidation regardless |
Federal vehicle safety rules from NHTSA also shape insurance costs indirectly, through features such as automatic emergency braking, but NHTSA does not regulate insurance.
What stays with the states
Nearly everything a driver deals with day to day:
- Whether insurance is required and how much. Each state sets its own financial responsibility law and minimum limits. The state car insurance requirements lookup shows them.
- Fault rules. No-fault, at-fault and choice systems; comparative or contributory negligence; lawsuit deadlines.
- Rates. What factors insurers may use and whether rates need approval first.
- Claims handling. Deadlines to acknowledge and pay claims, total-loss rules, repair-shop choice.
- Licensing and solvency. Which companies and agents may sell, and the guaranty funds that pay claims if an insurer fails.
- Enforcement and complaints. Each state's state department of insurance, led by an insurance commissioner; see what your state insurance department does.
- Proof and penalties. Insurance verification, uninsured-driver penalties and SR-22 rules, usually run by the motor vehicle department.
The debate
The state system has defenders and critics, and the arguments come up whenever insurance prices spike.
| Arguments for state regulation | Arguments for more federal involvement |
|---|---|
| Rules fit local conditions: weather, litigation climate, traffic, cost of care | Fifty-six sets of rules raise compliance costs for national insurers |
| Regulators are closer to consumers and easier to reach | Consumer protection varies widely depending on where you live |
| States experiment, and others copy what works, such as no-fault reforms or claims deadlines | Coordination through NAIC models is voluntary and uneven |
| The NAIC provides common standards without a federal agency | Large national and global insurers are hard for any one state to supervise |
For car insurance, which is sold and claimed locally, the state system has never faced a serious federal replacement. Congress narrowed the McCarran-Ferguson antitrust exemption for health and dental insurance in 2021, but left property and casualty insurance, including auto, under the original framework.
What this means for you
- Use your state's rules, not national advice. Minimums, claim deadlines and lawsuit rights differ; check your state's guide, such as California or Texas.
- Complain to your state insurance department, not a federal agency, about an insurer's claims handling or pricing.
- Use federal rights for data problems. If an insurer cites a consumer report, request it and dispute errors under the Fair Credit Reporting Act.
- When you move, re-check everything. Your coverage must meet the new state's laws; see moving to a new state: how to switch your car insurance.
Key takeaways
- Paul v. Virginia (1869) kept insurance out of federal commerce power until South-Eastern Underwriters reversed it in 1944.
- The McCarran-Ferguson Act (1945) returned insurance regulation to the states and limits federal laws that do not specifically address insurance.
- The Federal Insurance Office monitors and advises but does not regulate car insurers.
- Federal law still matters through credit-reporting rights, FTC action on data practices, the Graves Amendment and total-loss reporting.
- Coverage requirements, rates, claims rules and complaints are handled state by state.