Car insurance, explained.
Plain-language guides to how car insurance actually works. Each guide focuses on a process or method that cuts across coverage types, states, and insurers, and hands off to the coverage, cost, state, or situation guide when you need more depth.
How car insurance works
A plain-language primer on what car insurance is, how premiums are set, and what to expect if you file a claim.
How car insurance works
4 guidesFoundational orientation: the contract, the coverages, how premiums are set, and what to expect from the claims process.
How to read an auto insurance policy
How to read the actual policy document: what the declarations page controls, how the coverage forms, endorsements, exclusions, definitions, and conditions layer together, and what to verify at every renewal or policy change.
How it worksWhat is the declarations page?
The one-page summary that lenders, lessors, and the DMV ask for as proof of coverage. 10 fields on a dec page and when each is enforced.
How it worksWhat is a car insurance premium?
The seven components of a premium, 6-month vs 12-month terms, paid-in-full discount, and why the same driver sees different premiums at different carriers.
How it worksTypes of car insurance coverage
Every line a U.S. personal auto policy can carry in one place: 4 mandatory liability components, 2 physical-damage lines, 2 first-party medical lines, 15 common optional endorsements. One sentence per line plus a link to the full guide.
Shopping and switching
8 guidesComparing quotes, choosing coverage limits, moving from one insurer to another, and reading a policy without getting lost.
How to compare car insurance
A method for comparing car insurance quotes on identical terms, with a checklist, an 8-step playbook, and the traps that make quotes look cheaper than they are.
Shopping and switchingHow to get car insurance
The buying-process guide: what information insurers ask for, how to request comparable quotes, how to verify the insurer, and how to bind coverage without a gap.
Shopping and switchingHow to switch car insurance
How to move from one auto insurer to another without a coverage gap: bind the replacement, confirm the effective date, and only then cancel the old policy.
Shopping and switchingHow to choose car insurance coverage limits
A method for reasoning about coverage limits: how to separate the state legal floor from the personal risk limit, how liability, UM/UIM, PIP, deductibles, umbrella underlying requirements, and lender contracts interact, and how to test the incremental cost of each tier.
Shopping and switchingHow to cancel car insurance
Bind the replacement policy first, cancel in writing, keep a confirmation letter. Pro-rata vs short-rate refunds, early-termination fees, and the lapse trap that triggers DMV reporting.
Shopping and switchingHow to transfer insurance between vehicles
ISO 30-day newly-acquired-auto rule gives you a window of automatic coverage. 3 steps to transfer and 4 common pitfalls (ownership gap, inherited coverage, timing).
Shopping and switchingHow to add or remove a driver
Who to list, what happens on the MVR check, how to remove a household driver safely, and when a Named Driver Exclusion is the right call.
Shopping and switchingWhen to drop collision and comprehensive
The 10x rule, four conditions that must all be true, and worked examples. What you lose when you drop the physical-damage lines.
Claims and total losses
3 guidesWhat to do when you file a claim, how insurers handle a total loss, and how actual cash value is determined.
How to file a car insurance claim
The full car insurance claims process: reporting the loss, working with the adjuster, reviewing estimates and settlements, resolving supplements and disputes, and closing the claim.
Claims and total lossesHow long does an accident stay on car insurance?
3 to 5 years at most insurers; Progressive 3, Allstate 5, State Farm 3 to 5. California statutory 3-year cap. Not-at-fault vs at-fault, surcharge decay, and switching carriers mid-cycle.
Claims and total lossesThe car insurance claim timeline
What happens on each day after you file. Day 0 FNOL; days 1 to 3 adjuster + liability; days 3 to 10 inspection and estimate; days 7 to 21 repair; days 10 to 30 payment. State prompt-pay deadlines. Injury claims run on a different clock.
Pricing and rating
4 guidesHow insurers calculate rates, what factors move a premium, and where credit-based scoring is restricted.
How to lower car insurance
A method for lowering your premium without silently buying less protection: identical-inputs shopping, deductible trade-offs, discounts, telematics, mileage, vehicle choice, and a premium-versus-risk decision framework.
Pricing and ratingHow car insurance companies calculate rates
How auto insurers turn risk information into a premium: the underwriting-then-rating model, the driver, vehicle, policy, and location factors that enter, and why the same driver can be priced differently by different insurers or at a new renewal.
Pricing and ratingWhat is a car insurance deductible?
Which parts of a policy have deductibles, how changing the deductible changes the premium, per-claim vs per-year rules, and vanishing-deductible programs.
Pricing and ratingHow your insurance score works
The CBIS score weights payment history ~40%, utilization ~30%, length ~15%. How it differs from FICO; the 4 states that prohibit credit-based rating.
What Guides cover
Guides are for process and method. When your question is about what one coverage type does, see the coverage guides. For dollar figures and national averages, see the cost guide. For the rules in a specific state, the state guides. If you had an accident or another life event, the situation guides.
How car insurance works
Foundational orientation: the contract, the coverages, how premiums are set, and what to expect from the claims process.
Shopping and switching
Comparing quotes, choosing coverage limits, moving from one insurer to another, and reading a policy without getting lost.
Claims and total losses
What to do when you file a claim, how insurers handle a total loss, and how actual cash value is determined.
Pricing and rating
How insurers calculate rates, what factors move a premium, and where credit-based scoring is restricted.