| Coverage Types in a Standard Policy | Typically 6–8 distinct coverages (Insurance Information Institute) |
| States Requiring Auto Insurance | 49 out of 50 (New Hampshire is the exception) (Insurance Information Institute) |
| Most Common Claim Type | Collision damage (Insurance Information Institute) |
| Average Policy Renewal Period | 6 or 12 months (Standard U.S. industry practice) |
How to Use This Reference
Auto insurance policies are dense documents — but the terminology follows predictable patterns once you know the framework. This glossary covers the 40 most common terms you'll encounter when buying a policy, reviewing your declarations page, or working through a claim. Terms are grouped by theme rather than alphabetically so related concepts sit together.
For a broader explanation of how coverage types work together, see Auto Insurance Decoded. If you're also navigating vehicle financing, the car finance glossary covers loan and lease terminology separately.
| Coverage Types in a Standard Policy | Typically 6–8 distinct coverages (Insurance Information Institute) |
| States Requiring Auto Insurance | 49 out of 50 (New Hampshire is the exception) (Insurance Information Institute) |
| Most Common Claim Type | Collision damage (Insurance Information Institute) |
| Average Policy Renewal Period | 6 or 12 months (Standard U.S. industry practice) |
Policy Structure Terms
These terms describe the document itself — what it contains, how it's organized, and the key parties involved.
- Policy Period: The start and end dates during which your coverage is active. Coverage lapses if a renewal payment isn't made before expiration.
- Named Insured: The person listed as the primary policyholder. See the glossary above for the full definition.
- Additional Insured: A person added to the policy who receives some coverage protections, often a spouse or domestic partner.
- Exclusion: A situation or damage type not covered by the policy. Common exclusions include intentional damage, business use of a personal vehicle, and racing. Common misconceptions about exclusions trip up many drivers.
- Endorsement / Rider: A written modification to your base policy. Endorsements can add coverage (gap insurance, rental reimbursement) or remove it.
- Binder: A temporary proof of insurance issued immediately after purchase, before the formal policy document is produced.
State Minimum Requirements Vary Widely
Every U.S. state sets its own minimum liability coverage requirements, and some require additional coverage types such as personal injury protection (PIP) or uninsured motorist coverage. The minimums are a floor, not a recommendation — they often fall far short of what a serious accident can cost. Always verify your state's requirements with your state's department of insurance website.
Your Dec Page Is Your Quick Reference
Before filing any claim or shopping for a new policy, locate your declarations page. It summarizes every coverage type you carry, your policy limits, and your deductibles in one place. Insurers are required to provide one at issuance and at each renewal.
Coverage and Claims Terms
Understanding what each coverage type does — and how claims are settled — prevents surprises after an accident.
- Bodily Injury Liability (BI): Pays for medical costs, lost wages, and legal fees of other people injured in an accident you caused.
- Property Damage Liability (PD): Covers damage your vehicle causes to another person's property — their car, fence, or structure.
- Split Limits: A way of expressing liability coverage as three numbers (e.g., 25/50/25): per-person injury limit / per-accident injury limit / property damage limit, all in thousands of dollars.
- Combined Single Limit (CSL): A single total dollar amount that can be applied to any combination of bodily injury and property damage in one accident.
- Uninsured Motorist Coverage (UM): Protects you when the at-fault driver has no insurance at all. Why this coverage matters more than many drivers realize.
- Underinsured Motorist Coverage (UIM): Activates when the at-fault driver's limits are too low to cover your full losses.
- Personal Injury Protection (PIP): A no-fault coverage — required in some states — that pays medical bills and sometimes lost wages for you and your passengers regardless of who caused the accident.
- Medical Payments Coverage (MedPay): Similar to PIP but narrower in scope; covers medical expenses for occupants of your vehicle after an accident.
- Gap Coverage: Pays the difference between what your insurer pays (actual cash value) and what you still owe on a car loan or lease if your vehicle is totaled.
- Rental Reimbursement: An optional endorsement covering rental car costs while your vehicle is being repaired after a covered claim.
- Roadside Assistance: An add-on covering towing, flat tires, battery jump-starts, and lockout services.
- Towing and Labor: Similar to roadside assistance but typically limited to towing costs only.
1 in 8
Drivers on U.S. roads are uninsured
According to the Insurance Research Council, roughly one in eight drivers lacks any auto insurance coverage.
~13%
Share of claims involving uninsured drivers
Insurance Research Council data indicates uninsured motorist claims account for a significant and growing portion of all auto claims.
Valuation and Settlement Terms
When a claim is paid, the method used to calculate the payout significantly affects how much you receive.
- Actual Cash Value (ACV): Market value minus depreciation at the time of loss. Most standard policies use ACV for vehicle settlements.
- Replacement Cost Value (RCV): The cost to replace a damaged item with a comparable new one, without depreciation deducted. More common in homeowners policies but sometimes available as an auto endorsement.
- Depreciation: The reduction in a vehicle's value over time due to age, mileage, and wear. Insurers factor this into ACV payouts.
- Total Loss: When repair costs exceed a threshold — typically a percentage of the vehicle's ACV set by state regulation — the insurer declares the vehicle a total loss and pays ACV instead of repair costs.
- Salvage Value: The residual value of a totaled vehicle. If you keep a totaled car, the insurer deducts salvage value from your settlement.
- Subrogation: After paying your claim, your insurer may pursue reimbursement from the at-fault party. You may be required to cooperate but are not typically involved in negotiations.
- Appraisal Clause: A dispute resolution mechanism allowing each party to hire an independent appraiser if they disagree on a claim's value.
- Proof of Loss: A formal statement submitted to your insurer documenting the details and dollar amount of your claim.
Pricing and Risk Terms
These terms explain how insurers calculate what you pay — and what actions can change your rate.
- Underwriting: The process insurers use to evaluate an applicant's risk profile and determine whether to offer coverage and at what price.
- Risk Factor: Any characteristic used to assess the likelihood of a claim — driving history, vehicle type, location, credit-based insurance score (where permitted by state law), and others.
- Credit-Based Insurance Score: A scoring model — distinct from a credit score — used by many insurers in states where it's permitted to help predict claim likelihood.
- Surcharge: A premium increase applied after certain events, such as an at-fault accident or traffic violation.
- Discount: A premium reduction for qualifying factors such as a clean driving record, multi-policy bundling, or vehicle safety features.
- Loss Ratio: The proportion of premiums an insurer pays out in claims. Relevant when assessing an insurer's financial health, though not a consumer-facing metric directly.
- Telematics / Usage-Based Insurance (UBI): Programs where a device or app monitors driving behavior — speed, braking, mileage — and uses that data to adjust premiums.
- SR-22 / FR-44: State-required certificates of financial responsibility that some high-risk drivers must file, proving they carry minimum liability coverage.
This article is for general informational purposes only and does not constitute personalized insurance, legal, or financial advice. Coverage terms, definitions, and requirements vary by state and insurer. Always read your full policy documents and consult a licensed insurance professional for guidance specific to your situation.