Compare Car Insurance Rates in Ohio
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How Insurance Companies Build a Rate Filing
Every time your car insurance premium changes, that change had to be justified — in writing, with data — before it could reach your bill. Insurance companies don't set rates arbitrarily. They employ actuaries, who are mathematicians that specialize in risk, to build detailed rate change filings backed by years of claims and financial data.
The Actuarial Foundation
Before an insurer submits a single page to a state regulator, its actuarial team analyzes:
- Historical loss data — Years of claims, how often they occur, and how much they cost
- Loss development trends — How quickly claims are being settled and at what cost
- Expense ratios — The company's operating costs as a percentage of premiums collected
- Projected future losses — Forecasts of what claims will cost in the coming policy period
- Permissible loss ratio — The maximum share of premium the insurer can pay in claims and still remain financially healthy
The goal is a rate that is actuarially sound: adequate to cover claims, not excessive for the risk, and not unfairly discriminatory between similar policyholders.
Understanding how insurance loss ratios drive rate changes can give you important context for why your premium moves up or down.
What Goes Into a Rate Filing Submission
Once the actuarial work is done, insurers submit a formal filing to the state. A complete personal auto rate filing typically includes:
| Document | Purpose |
|---|---|
| Actuarial memorandum | Signed certification that the rate is actuarially justified |
| Loss & expense exhibits | Historical data supporting the rate change indication |
| Rate manual | The complete schedule of rates, factors, and rules |
| Rate change indication | Summary showing the percentage change requested |
| Consumer disclosures | Required notices for policyholders receiving increases above a threshold |
In states like Arizona, insurers must also include a certification from a company officer attesting to the accuracy and completeness of the filing. Many states require policyholders to be notified at least 30 days before a renewal premium increase above a certain percentage takes effect.
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The Four State Regulatory Systems Explained
Not all states regulate insurance rates the same way. The system your state uses has a significant impact on how quickly rates can change and how much consumer protection is built into the process.
Prior Approval
Insurers must file and receive explicit approval from the state insurance department before a new rate can take effect. This gives regulators the most oversight but can also slow down the market.
File-and-Use
Insurers file rates with the state and can begin using them immediately (or after a brief waiting period), while regulators review the filing afterward and may require modifications or order the insurer to roll back rates.
Use-and-File
Insurers implement rates first, then submit the filing to the state within a defined period (often 30 days). Arizona, for example, operates on a use-and-file system for personal auto insurance.
Flex Rating
Insurers can adjust rates within a pre-approved band — such as plus or minus 7% — without needing further approval. Any change exceeding that band triggers the full prior-approval review process.
Your state's regulatory system is one of the reasons car insurance requirements and costs differ so dramatically by state. The system in place directly shapes how quickly rate increases reach your policy.
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How Long Does Rate Approval Actually Take?
The timeline from filing to approval varies widely by state and the complexity of the filing.
Average Days to Approval
According to Milliman's analysis of public rate filing data through mid-2025, the nationwide average for private passenger auto rate approvals is approximately 73–76 days. However, state-by-state variation is extreme:
| State Example | Approx. Average Days to Approval |
|---|---|
| Fast states (e.g., Wisconsin) | ~11–15 days |
| Moderate states (e.g., Arizona) | ~47 days |
| Slow states | 100+ days |
| California (rate cap system) | ~246 days (2023 data) |
The average days to approval for auto rate filings grew from 39 to 54 days over the period from 2010 to 2023, reflecting increased regulatory scrutiny and higher filing volumes. In Q1 2025, median approval times were notably higher than 2023 levels, as regulators handle a surge of filings driven by continued cost pressures.
What Causes Delays?
- Deficiency letters — Regulators request additional data or clarification, restarting the clock
- High filing volumes — Departments with limited staff face backlogs during peak filing seasons
- Contested filings — Consumer advocacy groups or state attorneys general may formally challenge a proposed rate
- Complex multistate filings — Insurers filing in dozens of states simultaneously face staggered timelines
Understanding what factors drive your individual premium alongside these systemic pressures gives you the full picture of why your rate is what it is.
Consumer Protections & How to Challenge a Rate Increase
The rate filing system isn't just designed to protect insurers' solvency — it includes meaningful consumer protections at both the state and federal levels.
Your Built-In Protections
- Public record access: Rate filings are public documents in most states. You can review exactly what your insurer filed and whether approved rates match what you were charged.
- Advance notice requirements: Most states require insurers to notify you of a significant premium increase — typically 30 to 45 days — before your renewal date.
- Not-at-fault protections: Several states, including Ohio, prohibit insurers from raising rates after a not-at-fault accident. California and Massachusetts have similar protections.
- Prohibited rating factors: Some states ban the use of credit scores, gender, or occupation in setting auto rates. California, Hawaii, Massachusetts, and Michigan have credit score restrictions. Learn more about how your credit score affects your car insurance rate.
- Public hearings: In prior-approval states, major rate increases may trigger public comment periods, giving consumers a formal voice in the review process.
How to Challenge a Rate Increase You Believe Is Unfair
If you receive a rate increase and suspect a procedural violation — such as a rate being applied before it was approved, or not receiving proper advance notice — filing a complaint with your state's Department of Insurance is your most direct avenue. Most state DOI websites allow online complaints.
For increases related to an adverse underwriting decision — such as a denial, nonrenewal, or coverage reduction — you also have rights under the Fair Credit Reporting Act. Understanding insurance adverse action notices and your FCRA rights can help you take appropriate action.
If your insurer is engaging in bad faith practices beyond a standard rate increase, you may have additional legal remedies. Reviewing your rights when it comes to denied claims and appeals is a valuable related step.
Frequently Asked Questions
Can an insurance company raise my rates without state approval?
In prior-approval states, no — insurers must receive regulatory sign-off before a rate change can take effect. In file-and-use and use-and-file states, the rate can be implemented before or simultaneously with review, but the state still has authority to disapprove it afterward and require adjustments. If you're charged a rate that was never properly filed or approved, that's a regulatory violation you can report to your state's Department of Insurance.
How do I find out if my rate increase was actually approved by my state?
Rate filings are public records in most states. Visit your state Department of Insurance website and search the rate filing database — most use the SERFF (System for Electronic Rate and Form Filing) system — to look up your insurer's filings by company name and line of business. You can verify the approved rate change percentage and the effective date to confirm your renewal matches what was filed.
Why do car insurance rates go up even when I haven't filed any claims?
Insurance rates are set based on pooled risk across thousands of policyholders, not just your individual record. When repair costs, medical bills, litigation costs, or weather-related losses rise across your insurer's book of business or your region, those costs are spread across all policyholders — including drivers with clean records. Understanding what affects your car insurance rates beyond your driving record can help you anticipate and respond to these systemic increases.
How long does it take for a rate increase to be approved?
The national average for private passenger auto rate filing approvals is approximately 73–76 days as of mid-2025, though this varies significantly by state. Fast-moving states can approve filings in under two weeks, while states like California with stricter review standards averaged over 240 days. More complex filings, or those that require additional data from the insurer, can take significantly longer regardless of the state.
What should I do if I think my insurer illegally increased my rate?
Start by requesting a written explanation of the rate change from your insurer. Then verify the increase against the insurer's public rate filing with your state's Department of Insurance. If the rate applied doesn't match what was approved, or if you weren't given required advance notice, file a formal complaint with your state DOI. For issues related to not-at-fault accident surcharges or other specific legal protections, consider consulting a consumer protection attorney, especially in states with statutes expressly prohibiting those increases.