Of everything it costs to keep a car, insurance is the only line that can be known precisely, for a specific car, before buying it. It takes ten minutes and it is routinely done afterwards.
The national figure
The National Association of Insurance Commissioners collects what was actually written rather than what was quoted. Its 2023 Auto Insurance Database, published in June 2025, gives a national average combined premium of $1,438.44 a year, which is $119.87 a month.
State matters. The same database puts Texas at $1,726.92 a year, $143.91 a month, which is $288.48 a year more than the national average for the same coverage on average vehicles.
The car matters more
A second set of figures, quoted rather than written, shows the size of the effect the buyer actually controls. MoneyGeek's model-year-matched rates put a mainstream car at about $214 a month, a sports car at about $282.50, and an exotic at about $340.
Those three are comparable with each other and not with the NAIC average above them: different method, different population, quotes rather than written premiums. The honest reading is the ratio rather than the level. On a like-for-like basis a sports car costs around a third more to insure than a mainstream one, and an exotic around sixty percent more.
Why the quote comes first
A payment can be negotiated, a deposit can be found, a term can be stretched. A premium is priced by an underwriter looking at the car, the postcode, the driver and the record, and there is nothing to negotiate. It is the least flexible number in the whole purchase and it is the one most often discovered last.
Before the test drive, not after
Run a real quote on the exact year, model and trim, at the address the car will live at, with the coverage actually wanted. Two cars at the same price can be $80 a month apart, which is $4,800 over five years.
What moves a premium that a buyer controls
The car, first and by a distance. Then the coverage: the difference between a $500 and a $1,000 deductible is a real monthly saving and a real amount of money owed at the worst possible moment, and that trade is a personal one rather than a right answer. Then the address, which is not usually up for discussion but does explain why a friend's quote is not yours.
What does not move it is loyalty. Premiums are re-rated every renewal, quotes are free, and the only cost of checking annually is the twenty minutes.
- Source: NAIC, 2023 Auto Insurance Database Average Premium Supplement (June 2025), read 1 September 2026
- Source: MoneyGeek, model-year-matched car insurance rates, read 2 September 2026
