Ask two insurers for coverage on the same car, at the same address, with the same driver, and you will often get two noticeably different answers. That is not a mistake, and it does not mean one of them is wrong.
Understanding how rates get built explains both why the numbers differ and why your renewal can move without anything in your life having changed.
Underwriting and rating are two different steps
These get used interchangeably and they are not the same.
Underwriting is the yes-or-no decision, plus which company within a group and which tier you are placed in. It asks whether the insurer is willing to take on the risk at all, and on what terms. An underwriting decision is why an application can be declined, non-renewed, or moved to a different tier.
Rating is the arithmetic that produces the number, applying the insurer's filed rates and factors to your specific characteristics.
You can be accepted and still land in an expensive tier, or be declined outright. When the standard market declines a risk, the remaining routes are typically a surplus lines carrier, which is not licensed by the state in the same way and is not backed by the state guaranty association, or a residual market mechanism: a FAIR plan for property, an assigned risk plan for auto.
What goes into an auto rate
Insurers weigh these differently, and each files its own approach, which is a large part of why quotes diverge.
About the driver
- Driving record, meaning at-fault accidents, moving violations and any serious convictions, generally looked at over a defined recent period
- Years of driving experience
- Age, where the state permits its use
- Prior insurance history, including whether you have had continuous coverage or a lapse
About the vehicle
- Make, model, model year and trim
- The vehicle's actual claims experience, meaning how often that model is involved in claims, how expensive it is to repair, and how often it is stolen. Insurers draw on loss data compiled by organizations such as the Highway Loss Data Institute and theft data from the National Insurance Crime Bureau, so this is empirical rather than a judgment about the car
- Safety features and anti-theft equipment
About the use
- Annual mileage and whether the car is used for commuting
- Where the vehicle is garaged, which reflects local claim frequency, theft rates, traffic density and repair costs
- Whether it is used for business or delivery work
About the policy
- The coverages you select and the policy limits you choose
- Your deductibles
- How many vehicles and drivers are on the policy
What goes into a home rate
About the structure
- Estimated cost to rebuild, which drives Coverage A and is not the same as market value or purchase price
- Age of the home and of its major systems, meaning roof, electrical, plumbing and heating
- Construction type and materials
- Square footage, layout and any special features
- Roof age, surface material and condition, which has become one of the more influential single factors in property rating
About the location
- Exposure to the perils common in your area: wind, hail, wildfire, earthquake, flooding
- Protection class, a rating reflecting distance to a fire station and to a fire hydrant, and the quality of local fire protection
- Local claim experience and construction costs
About the property's history and use
- Prior claims on the property, which is where C.L.U.E. comes in
- Whether it is a primary residence, a second home, or rented out
- Presence of features insurers treat as elevated liability, such as a pool, a trampoline, or certain dog breeds. The specifics vary considerably by insurer
About the policy
- Your Coverage A limit and liability limits
- Deductibles, including any separate wind, hail or hurricane deductible
- Valuation method and endorsements
Claims history follows the property, not just the person
Most people know their own claims count. Fewer know that property claim history attaches to the address.
Insurers use claims history databases, the most widely known being C.L.U.E., maintained by LexisNexis. A C.L.U.E. report on a property typically shows claims filed over roughly the last several years, including claims filed by a previous owner. Buy a house that had two water losses under its last owner and that history can follow you into your first quote.
Two practical points:
- Under the Fair Credit Reporting Act you can request your own C.L.U.E. report, for yourself and for a property you own, and dispute inaccurate entries. Doing this before buying a home, or before shopping coverage, is worth the effort.
- Inquiries are not always claims. Calling to ask hypothetically about coverage can sometimes be recorded. Asking your agent whether a question will be logged before you describe an incident is a reasonable thing to do.
Credit-based insurance scores
In most states, insurers may use a credit-based insurance score as a rating factor. It is not your lending credit score. It is a separate score built from credit report data and validated against insurance loss experience, and it does not consider income.
Its use is restricted or prohibited in a number of states, and this is an area where you should verify locally rather than trust any national summary, including this one.
Broadly, California, Hawaii, Massachusetts and Michigan are the states most commonly identified as prohibiting credit-based insurance scores in auto insurance. The specifics differ: California's restriction dates to Proposition 103 and limits auto rating factors much more broadly; Hawaii's prohibition applies to auto while credit may still be used for homeowners; Michigan's came with its 2020 no-fault reform and carries a carve-out around installment payment eligibility, which is why some sources count three states rather than four.
Several other states restrict rather than prohibit. Maryland, Oregon and Utah are frequently cited, with rules that variously bar credit-based non-renewal or cancellation, limit its use at renewal, or forbid it as the sole basis for an underwriting decision. Other states impose narrower constraints.
These rules change through legislation and regulation. Confirm the current position with your state's Department of Insurance.
Why two insurers quote differently
Four reasons, none of them arbitrary.
Each insurer files its own rates. Rates and rating factors are filed with the state regulator, and companies weigh the same information differently based on their own loss experience and their own view of risk.
Each has an appetite. One insurer may want newer homes in low-wind areas; another may specialize in older properties or in drivers with a violation on record. You look better to the company whose appetite you fit.
Regulatory regimes differ by state. Some states use prior approval, where a regulator must sign off before a rate change takes effect. Others use file and use, where the insurer can implement a filed change and the regulator reviews it afterward. Which regime applies affects how quickly rates move.
Discounts differ. The available discounts and their weight are insurer-specific, which is a large part of the spread between two quotes for identical coverage.
Why a renewal can rise when nothing changed
This one frustrates people, and the explanation is usually not about them at all.
Most rate changes are not individual. They are approved changes applied across a book of business in a state, reflecting the insurer's overall loss experience, the cost of repairs and construction, severe weather activity, and the cost of the reinsurance the insurer itself buys. Repair and rebuilding costs have moved substantially in recent years, and rebuilding a home costs what it costs regardless of your personal claim record.
Individual factors can also shift quietly: a discount that expired, a driver added or removed, a change in your credit-based insurance score in states where it is used, a roof that crossed an age threshold, or a change in how your area is rated for wildfire or wind.
If a renewal moves significantly, ask your insurer or agent what specifically changed. In many states you are entitled to an explanation, and if a credit-based insurance score contributed to an adverse decision, adverse action notice requirements generally apply.
What you can actually influence
Some factors are fixed. Others are not.
- Your coverage choices and deductibles, the most direct lever you control. See how car insurance deductibles work for the trade-off involved
- Your driving record, over time
- Discounts you qualify for but have not claimed, covered in insurance discounts worth asking about
- Roof age and mitigation on the property side, where a replacement or wind-resistant upgrade can affect both eligibility and rating
- Continuous coverage, since a lapse is itself a rating factor
- Accuracy of the information on file, including mileage, garaging address, drivers listed, and your C.L.U.E. history. Your declarations page is where to check it
Reviewing your coverage at renewal, and after any life event that changes the picture, is how most of these get caught.
Related reading: car insurance coverage types and what homeowners insurance covers.
Rating factors, their weight, and the state rules governing their use vary by insurer and by state and change over time. Nothing here predicts what you will be charged. For anything specific to your situation, speak with a licensed agent or your state's Department of Insurance. When you are ready, you can request quotes for auto insurance or home insurance and get connected with licensed providers who cover your area.