Compare Car Insurance Rates in Ohio
See if you qualify for a lower rate in less than 2 minutes
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, mathematicians who 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. Modern insurers increasingly use machine learning models, telematics data, and advanced vehicle scoring that processes hundreds of data points to build more precise risk profiles.
Understanding how car insurance premiums are calculated 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. Most states require policyholders to be notified at least 30 days before a renewal premium increase above a certain threshold takes effect.
Compare Car Insurance Rates in Ohio
See if you qualify for a lower rate in less than 2 minutes
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. California's prior-approval system averaged 185 days for approval in 2025, with a 4-quarter rolling average of 234 days through mid-2025 — the longest in the nation — and the state's combined rejection and withdrawal rate has remained elevated in recent years.
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, with an average approval time of around 40 days in 2025 and a 4-quarter rolling average of just 31 days.
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 key reasons car insurance requirements and costs differ so dramatically by state. The system in place directly shapes how quickly rate increases reach your policy.
Protect your car with Farmers
Average Rate:
Find coverage options that fit your budget.
The insurance savings you expect.
Average Rate:
Enjoy personalized policies, comprehensive coverage & more.
See how much you could save today!
Average Rate:
Drivers who switch their auto insurance and save with State Farm save $764 on average!
Safe Drivers Save with Allstate®
Average Rate:
Get rewarded with savings for having a clean driving record.
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 Q2 2025 data, the nationwide average for private passenger auto rate approvals was 59 days in 2025 (through June 30), with a 4-quarter rolling average of 67 days (July 2024–June 2025) — up significantly from approximately 39–49 days a decade ago, reflecting increased regulatory scrutiny and higher filing volumes. However, state-by-state variation is extreme:
| State | Approx. Average Days to Approval (2025) | 4-Qtr Rolling Avg |
|---|---|---|
| Tennessee | ~28 days | ~36 days |
| Arizona | ~40 days | ~31 days |
| Alabama | ~36 days | ~46 days |
| Countrywide Average | ~59 days | ~67 days |
| Colorado | ~101 days | ~138 days |
| Texas | ~157 days | ~170 days |
| California | ~185 days | ~234 days |
The District of Columbia requires the Commissioner to review filings within 90 days, with automatic deemed approval if no determination is made within that period.
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. You can also explore 2026 rate trends and forecasts to understand what's coming next.
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 via the SERFF Filing Access portal and verify 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: As of 2026, four states fully ban the use of credit scores in auto insurance rating: California, Hawaii, Massachusetts, and Michigan. Several others — including Maryland, Oregon, and Utah — restrict their use (e.g., not allowed for cancellations or renewals). New York has pending legislation that would expand credit score restrictions further. Learn more about what affects your car insurance rate including how credit factors into pricing.
- Minimum coverage updates: Several states raised minimum liability limits recently — including California (to $30k/$60k/$15k effective Jan. 1, 2025), Virginia (to $50k/$100k/$25k), North Carolina (to $50k/$100k/$50k, effective July 2025), and Utah (to $30k/$65k/$25k) — providing better consumer protection, though these changes can push up premiums for drivers previously at the minimum.
- Public hearings: In prior-approval states, major rate increases may trigger public comment periods, giving consumers a formal voice in the review process. In California, consumer groups like Consumer Watchdog can formally intervene in rate hearings.
- Regulator rate denials: State insurance departments actively block unjustified hikes. Pennsylvania's Insurance Department denied over $210 million in requested auto rate increases in early 2025 alone.
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.
Understanding how car insurance premiums are calculated at the individual level gives you even more power to identify whether your increase is warranted. You can also review why your car insurance quote may have changed to spot discrepancies between estimates and what you're actually billed.
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. Always verify any increase against public filings using your state's DOI website or the SERFF Filing Access portal at portals.naic.org/serff-filing-access.
How do I find out if my rate increase was actually approved by my state?
Rate filings are public records in most states. Visit the SERFF Filing Access portal (portals.naic.org/serff-filing-access) or your state's Department of Insurance website and search by insurer name and line of business. You can verify the approved rate change percentage and effective date to confirm your renewal matches what was filed. If the numbers don't match, that's grounds for a formal complaint. Learning more about state-by-state insurance regulation can help you navigate your specific state's process.
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. National premiums declined roughly 6% in 2025 after two years of double-digit increases, but 25% tariffs on imported auto parts effective May 2025 are already pushing parts inflation up 6.6% year-over-year, with projected premium impacts of 3–7% in the hardest-hit markets through 2026. Understanding what affects your car insurance rates beyond your driving record helps you anticipate and respond to systemic increases.
How long does it take for a rate increase to be approved?
According to Milliman Q2 2025 data, the nationwide average for private passenger auto rate filing approvals was approximately 59 days in 2025 (through mid-year), with a 4-quarter rolling average of 67 days. Fast-moving states like Tennessee average around 28 days, while California averaged 185 days in 2025 with a rolling average of 234 days. More complex filings — or those that require additional data via deficiency letters — can take significantly longer regardless of state. You can also check how your policy renewal works to time your coverage decisions strategically.
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 via the SERFF Filing Access portal or your state's DOI website. 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 prohibited rating factors like credit scores — which are banned outright in California, Hawaii, Massachusetts, and Michigan — consider consulting a consumer protection attorney. You can also review 2026 car insurance rate changes by state to determine whether switching insurers makes more financial sense than challenging the rate.