What Is a Car Insurance Premium?

A car insurance premium is the amount you pay the insurer in exchange for coverage over a defined period. U.S. personal auto policies are almost always written as either a 6-month or 12-month term, with the premium billed monthly, pro-rated across the term. Premium is distinct from deductible (what you pay toward a claim) and from limits (the maximum the insurer will pay).

What a premium is made of

Insurers build the premium from these components:

1. Base rate, filed with the state insurance department. The starting point for a hypothetical average driver.
2. Rating factors that multiply or add to the base rate: age, driving record, credit (where allowed), vehicle, mileage, prior insurance, coverage limits, deductibles.
3. Discounts: multi-car, multi-policy, good-driver, good-student, defensive driver, paid-in-full, etc.
4. Surcharges: at-fault accidents, violations, lapse, SR-22 filing, DUI.
5. State and policy fees: policy fee, installment fee if paying monthly, state surplus-lines or guaranty-fund assessment.
6. Taxes: a handful of states levy a tax on auto insurance premium directly.

Billing terms

• 6-month policies are the common structure at Progressive, GEICO, and many non-standard carriers. The carrier re-rates every 6 months, so a change in record (clean period, new citation, address change) hits sooner.
• 12-month policies are standard at State Farm, Allstate, Farmers, and most independent-agent carriers. The premium is locked in for 12 months barring material misrepresentation or policy changes.
• Monthly billing is nearly universal. Carriers usually add a modest installment fee ($2 to $10 per installment).
• Paid-in-full discount: paying the entire term up front typically saves 5 to 10 percent at most carriers.

Why the same driver sees different premiums at different carriers

Each carrier files its own base rate and its own weighting of rating factors with the state insurance department. One carrier may weight credit heavily; another may weight prior-insurance tenure. A driver with excellent credit and a 5-year clean record may be cheapest at Carrier A; the same driver with a thin credit file may be cheapest at Carrier B. For the complete decomposition, see our how insurers calculate rates guide.

Premium vs other similar terms

• Premium: what you pay the insurer.
• Deductible: what you pay toward a claim before the insurer pays.
• Limit: the maximum the insurer pays on a covered claim.
• Policy fee: a flat fee on top of the premium at some non-standard carriers.
• Installment fee: a per-payment surcharge for monthly billing.