What Is a Car Insurance Rate Filing, and Why Does It Change My Bill?

A rate filing is the set of documents an insurance company submits to a state insurance regulator when it wants to change the prices it charges for a type of policy, or the rules and rating factors it uses to calculate those prices. Insurance is regulated state by state, so a company that sells car insurance in many states files separately in each one.

A filing can change your bill because it changes the rates and factors the insurer applies when your policy renews. The percentage attached to a filing is not a personal number, though. The Texas Department of Insurance describes the percent change on a filing as "the estimated impact that the rate change has on existing policyholders," and notes that impacts "could be higher or lower for any policyholder depending on changes to specific factors." ²

A filing is more than a single percentage. The Texas Department of Insurance's public search shows the main fields a reader will meet on most filings: the company name, the date the insurer gave the filing to the department, the type of insurance (personal auto or homeowners), a product name, the estimated percent change, a SERFF filing number, and two separate effective dates, one for new policies and one for renewals ². It also shows a status: a "pending" filing is still under review, and a closed filing is marked as reviewed, rejected or withdrawn ².

Most filings are submitted electronically through SERFF, the System for Electronic Rates and Forms Filing, which the National Association of Insurance Commissioners runs as a shared platform connecting state regulators and insurers ¹. Its public side, SERFF Filing Access, gives consumers online access to rate and form filings that states make public ¹.

States do not all review filings the same way, and the wording on a news story or a filing summary reflects that.

• Prior approval. In California, Proposition 103 requires property and casualty rates to be approved by the Insurance Commissioner before they are used. A consumer may request a hearing within 45 days, and when a rate request exceeds 7%, the Commissioner must hold a hearing upon a timely request ⁵.
• Filed before use, without advance approval. Texas requires insurers to file home and auto rates with the department before using them, but the department says, "We don't approve rates in advance." It reviews filings to make sure they follow state law ²³.
• Mixed systems. North Dakota describes itself as generally a prior approval state, but a personal auto filing under 5 percent may be use-and-file once per calendar year per company ⁴.

So "filed" means the insurer submitted it, "requested" describes what the insurer asked for, and "approved" means a regulator signed off where approval is required. A request is not an approval. Some departments publish summaries of the outcomes: Oklahoma, for example, posts monthly summaries of approved property and casualty rate changes and says its review does "not constitute rate-setting by the Department." ⁶

A filed percentage is an average across the company's existing policyholders in that state and product ². Inside that average, some drivers may see larger changes, some smaller, and some may see a decrease. The change for one household also mixes in everything else that moved at renewal: a new car, a new driver, a move, a lost discount or a different coverage choice.

The company name matters too. One insurance brand often sells through several legal companies, and each legal company files its own rates. The Texas department advises readers to find the exact company name on the policy or billing statement, or by calling their agent, because the insurer's name can differ from the agency's ².

A filing usually carries two effective dates. In the Texas listing, one is the date the company starts using the rate for new policies and the other is the date it starts using it for policies being renewed ². For an existing customer, the renewal date is the one that counts: a filing that took effect for new business in the spring may not reach your bill until your next renewal after the renewal effective date.

This is one reason prices seem to change without warning. A filing can be submitted, reviewed and put into use months before an individual policyholder sees it in a renewal notice.

• Search SERFF Filing Access for states that publish filings there ¹.
• Use your state insurance department's own search or summaries where it has one, such as Texas's filing search ² or Oklahoma's monthly summaries ⁶.
• Search by the legal company name on your policy, not only the brand you see in advertising ².

Filings can be long and technical. The pieces most readers need are the company name, the product (usually private passenger auto), the overall percentage, and the renewal effective date.

A filing explains what an insurer changed for a group of customers. It does not tell you your own renewal price, and it does not explain every reason a single bill moved. For that, start with the renewal notice itself; our guide on how to read your car insurance renewal notice walks through it line by line. If your price rose with a clean record, see why car insurance went up with no accident or ticket, and for one of the biggest cost drivers behind recent filings, see how repair costs push car insurance prices up. The full list of causes is in our main guide, why did my car insurance go up.

If you have a question about a filing or how it was applied to your policy, your insurer and your state insurance department are the places to ask.

• ¹ Official record: what SERFF is and that SERFF Filing Access gives the public online access to filings states publish, checked October 11, 2026.
• ² Official record: Texas filing fields, the definition of percent change as the estimated impact on existing policyholders, separate new and renewal effective dates, filing statuses, and advice on finding the company name, checked October 11, 2026.
• ³ Official record: Texas statement that the department does not approve rates in advance, checked October 11, 2026.
• ⁴ Official record: North Dakota's prior approval rule and the use-and-file option for personal auto filings under 5 percent once per calendar year per company, checked October 11, 2026.
• ⁵ Official record: California Proposition 103 prior approval, the 45-day window to request a hearing and the 7% hearing threshold, checked October 11, 2026.
• ⁶ Official record: Oklahoma's monthly summaries of approved rate changes and its statement that review is not rate-setting, checked October 11, 2026.