Insurance pricing can feel arbitrary, especially when two people with seemingly similar situations get very different quotes. In reality, underwriting is a structured process built around statistical risk factors specific to each type of coverage — understanding the main ones can help explain a quote, and sometimes reveal a lever you can actually pull to lower it.
The universal factors
Across nearly every type of personal insurance, two factors matter broadly: your claims history (both personal, and sometimes regional/statistical) and the coverage amount and structure you select, including your chosen deductible. Higher coverage, lower deductibles, and a history of claims all push premiums up.
Auto insurance factors
Age, driving record, vehicle make/model/safety rating, location (accident and theft rates vary significantly by area), annual mileage, and in many states, a credit-based insurance score all factor into pricing — though credit-based scoring has been restricted or banned in several states due to fairness concerns.
Homeowners insurance factors
Rebuild cost, roof age and material, home age, local catastrophe risk (wind, wildfire, flood zone proximity), claims history on the property, and proximity to a fire station or hydrant all play into pricing — which is part of why identical-looking homes in different zip codes can carry very different premiums.
Life insurance factors
Age and overall health dominate life insurance pricing, often assessed through a combination of a health questionnaire, sometimes a medical exam, and prescription/medical record checks. Tobacco use is one of the single largest single-factor price movers in life insurance underwriting.
Health insurance factors
Under the Affordable Care Act, individual market health insurers can generally only vary pricing based on age, location, tobacco use, and plan category (not health status or gender directly) — a meaningfully different, more restricted pricing model than auto, home, or life insurance.