Understanding Rate Filing Process Insurance for Insurance Brokers

The rate filing process insurance carriers follow determines whether the rates your clients pay are legally effective, how quickly carriers can respond to market changes, and what actuarial justification sits behind every premium you quote. Most brokers never see the inside of a rate filing, but understanding the mechanics -- who files, what each component means, how state reviews work, and what happens when a filing fails -- makes you a sharper advisor and helps you spot potential problems before they affect your clients. This guide walks through every stage of the process.

Key Takeaways

• Rates for most personal and commercial lines of insurance are filed either by the individual carrier or by an advisory organization such as ISO or NCCI on the carrier's behalf; in 2024, ISO filed rates on behalf of approximately 1,400 member carriers across 50 states (ISO 2024 Participation Data).
• A complete rate filing includes three actuarial components: loss costs (expected claims per unit of exposure), loss adjustment expenses (LAE, the cost to settle claims), and a profit and contingency loading; inadequate documentation of any component can trigger a regulatory deficiency notice (NAIC 2025 Rate Filing Reference Guide).
• The actuarial justification requirement means that every rate change must be supported by loss experience data, trend analysis, and an actuarial certification signed by a credentialed actuary (Fellow or Associate of the Casualty Actuarial Society) under state regulations in 37 states (CAS 2025 Actuarial Certification Requirements by State).
• State insurance department review timelines range from 30 days in file and use states to 180 days in prior approval states such as Massachusetts; during this period, regulators may issue one or more requests for additional information that reset or extend the review clock (NAIC 2025 Rate Filing Reference Guide).
• The NAIC's System for Electronic Rate and Form Filing (SERFF) processed 387,000 rate and form filings across all states in 2024, representing a 14% increase from 2021 (NAIC SERFF 2024 Annual Statistics).
• A withdrawn or disapproved rate filing in a prior approval state requires the carrier to maintain existing rates until a corrected filing is approved, which can leave carriers charging inadequate rates for months during a hardening market (NAIC 2024 Market Conduct Annual Statement data).

Who Files Rates and How the Advisory Organization System Works

The rate filing process insurance industry uses is built on a two-tier structure: advisory organizations develop industry-level data and loss costs, and individual carriers apply their own adjustments before filing.

Advisory organizations and their role. ISO (Insurance Services Office, now part of Verisk) and NCCI (National Council on Compensation Insurance) are the two largest advisory organizations in the United States. ISO develops loss costs, rating plans, and policy forms for most property-casualty lines. NCCI develops workers compensation loss costs and rating plans for 38 states and the District of Columbia. These organizations collect premium and loss data from thousands of carriers, develop actuarially credible loss costs using the pooled data, and file those loss costs with state regulators for approval.

How carriers use advisory organization data. Individual carriers can choose to use ISO or NCCI loss costs as the actuarial foundation for their own rates. The carrier then files a loss cost multiplier (LCM) or development factor that reflects the carrier's expense structure, profit target, and any experience adjustments. The final rate equals the advisory organization's loss costs multiplied by the carrier's LCM. A carrier with lower expenses might file an LCM below 1.0, producing rates below the advisory organization benchmark. A carrier targeting higher-risk segments might file a higher LCM.

Independent carrier filings. Large carriers often develop their own actuarial models rather than relying on ISO or NCCI data. Independent filings require the carrier to develop and document its own loss costs from its own historical data, which requires a large book of business for statistical credibility. Carriers with smaller books typically rely more heavily on advisory organization data, especially in states or lines where they lack sufficient experience to develop credible independent rate indications.

The role of the credentialed actuary. Every rate filing, whether based on advisory organization data or independent carrier data, must include an actuarial memorandum or certification signed by a qualified actuary. In 37 states, the actuary must be credentialed as a Fellow or Associate of the Casualty Actuarial Society (FCAS or ACAS). The actuarial memorandum describes the data used, the actuarial methodology applied, the rate indication developed, and the actuary's opinion that the filed rates are actuarially sound.

The Components of an Insurance Rate Filing

Understanding what goes into a rate filing helps brokers interpret rate changes and respond intelligently to client questions about why premiums change.

Loss costs as the foundation. Loss costs represent the expected future claim payments per unit of exposure. For personal auto, exposure is typically a car-year. For commercial general liability, exposure might be payroll, sales, or square footage. Loss costs are developed from historical claim data, adjusted for development (the fact that not all claims are fully paid when reported), trend (changes in claim frequency and severity over time), and credibility (the statistical reliability of the data given the volume of claims).

Trend analysis and its impact on rates. Trend adjustment is often the most controversial part of a rate filing. Carriers must project past loss experience forward to the period when the filed rates will be in effect. If medical costs are rising at 7% annually, and the policy period being rated is two years from the average accident date of the historical data, the loss costs must be trended up by approximately 14% just to maintain current adequacy. Regulators scrutinize trend assumptions closely because they have a large impact on the indicated rate change.

Loss adjustment expenses. LAE represents the cost to investigate, defend, and settle claims. LAE includes defense attorney fees, adjuster salaries, court costs, and allocated claim expenses. LAE is expressed as a percentage of loss costs and is added to the loss cost indication before the profit loading is applied. In lines with high litigation rates -- commercial general liability, professional liability, and medical malpractice -- LAE can add 20% to 40% to the loss cost base.

Expense loading. Above the loss and LAE components, the carrier adds a loading for operating expenses, including agent commissions, underwriting staff, premium taxes, and general administrative costs. Expense loadings for property-casualty carriers typically run between 25% and 35% of premium. The expense loading is reflected in the carrier's LCM when the carrier files on top of advisory organization loss costs.

Profit and contingency loading. The final component of the rate is a loading for profit and contingencies. This reflects the return on equity the carrier targets and a cushion for adverse development on reserves. The profit loading is typically 5% to 10% of premium. State regulators review the profit loading to confirm it is not excessive, which is one of the legal standards for rate approval in both prior approval and file and use states.

How State Regulators Review Rate Filings

State insurance departments vary significantly in their review capacity, expertise, and approach to rate filings. Understanding the review process helps brokers anticipate carrier pricing timelines.

The SERFF filing system. Nearly all rate filings are submitted electronically through the NAIC's SERFF system. SERFF provides a standard submission format, tracks filing status, and allows regulators to communicate with filers through the system. Carriers can monitor the status of their filings in real time. SERFF processed 387,000 rate and form filings in 2024, according to NAIC SERFF 2024 Annual Statistics. Brokers whose carriers use SERFF can sometimes obtain filing status information by requesting it from their carrier representative.

The completeness review. When a filing arrives, the regulator first checks whether it includes all required components. A filing missing an actuarial memorandum, a loss cost support exhibit, or required form changes will be returned as incomplete. The filing date -- which starts the review clock in prior approval states -- is typically the date the filing is deemed complete, not the date it was originally submitted. Incomplete filings can lose weeks of review time.

The actuarial review. After completeness, the regulator's actuarial staff reviews the loss cost development, trend assumptions, expense loading, and profit loading. Regulators look for methodology that conforms to accepted actuarial standards of practice (ASOPs), data that is consistent with industry benchmarks, and trend assumptions that are defensible given current conditions. Regulators in California, New York, and Massachusetts publish detailed actuarial critique letters that identify every point of disagreement with the carrier's assumptions.

Requests for additional information. Most substantive filings receive at least one request for additional information from the regulator. Each request typically extends the review period by 30 days from the date the carrier responds. Carriers that respond quickly and completely minimize the total review time. Carriers that provide incomplete or evasive responses face repeated requests that can extend the review by months.

Regulatory disapproval and withdrawal. In prior approval states, a disapproved filing requires the carrier to either revise and refile or challenge the disapproval. While the revised filing is under review, the carrier must use its existing rates, which may be inadequate in a rapidly changing loss environment. According to NAIC 2024 Market Conduct Annual Statement data, carriers that had rate filings disapproved experienced an average of 4.7 months at inadequate rates before revised filings were approved.

What Rate Filings Mean for Brokers

Brokers interact with the rate filing process most directly during three scenarios: hard market rate increases, new product launches, and carrier market withdrawals.

Hard market rate cycles. When a line of business enters a hard market driven by rising losses, carriers file for significant rate increases. In prior approval states, those increases take months to implement. Carriers in prior approval states may quote higher-than-filed rates and then reduce them to the filed rate at binding -- an error that creates regulatory exposure -- or they may simply decline to write new business during the review period. Brokers in hard markets should ask carriers directly whether filed rates are approved and effective.

New product and coverage launches. A carrier launching a new product in a state must file both rates and policy forms before the product can be offered. Form and rate filings often proceed in parallel, but a policy cannot be issued until both are approved in prior approval states. Brokers expecting a new product from a carrier should ask about the filing status in their key states before promising clients that coverage will be available.

Market withdrawal indicators. When carriers consistently fail to achieve actuarially justified rates in a prior approval state, they face the choice of absorbing underwriting losses or withdrawing. Brokers should monitor carrier loss ratios in prior approval states. A carrier with a combined ratio consistently above 110% in a state is a withdrawal candidate. Building a broader carrier panel in such states protects clients when withdrawals occur.

Frequently Asked Questions

Who is responsible for filing insurance rates -- the carrier or the broker?

Carriers are responsible for filing rates, not brokers. The carrier's actuarial and regulatory affairs teams prepare the rate filing, retain the certifying actuary, and submit the filing through SERFF to the state insurance department. Brokers do not file rates. However, brokers should know whether the rates they quote have been approved and are currently effective in prior approval states, because quoting unapproved rates creates E&O exposure and regulatory risk for the carrier.

What is a loss cost multiplier and how does it affect the rates I quote?

A loss cost multiplier (LCM) is the factor a carrier applies to an advisory organization's filed loss costs to produce its own rates. The LCM reflects the carrier's expense structure, profit target, and any experience adjustments beyond the advisory organization's baseline. A carrier with a 1.10 LCM charges 10% above the advisory organization's loss costs in its final rate. When a carrier announces a rate change, that change is often expressed as a change in the LCM rather than in the underlying loss costs. Understanding the LCM helps brokers interpret carrier rate changes in the context of market-wide loss cost trends.

How long does a state insurance department take to review a rate filing?

Review timelines depend on the state's regulatory system and the complexity of the filing. In file and use states, the carrier implements rates on the effective date stated in the filing without waiting for review. In prior approval states, statutory review periods run 30 to 60 days. However, requests for additional information extend the review period by 30 days per request in most states. States like California and Massachusetts are known for thorough reviews that can run 90 to 180 days for major personal lines filings. The Insurance Information Institute 2025 Rate Filing Speed Study found an average of 47 days from filing to implementation in prior approval states.

What is actuarial justification and why does it matter?

Actuarial justification is the documentation demonstrating that proposed insurance rates are adequate, not excessive, and not unfairly discriminatory. It includes the historical loss experience data, development factors, trend analysis, expense loading documentation, and the certifying actuary's opinion that the rates satisfy these standards. Every state requires actuarial justification for rate filings. In 37 states, the certifying actuary must hold an FCAS or ACAS designation from the Casualty Actuarial Society. Without adequate actuarial justification, a rate filing will be disapproved or receive a deficiency notice regardless of the regulatory system used.

What happens when a rate filing is disapproved?

In prior approval states, a disapproved filing requires the carrier to revise its submission and refile. During the revision and review period, the carrier must continue using its existing rates. If the existing rates are inadequate, the carrier absorbs underwriting losses on new and renewal business during this period. NAIC 2024 data shows that disapproved filings result in an average of 4.7 months at potentially inadequate rates before corrected filings are approved. In some cases, carriers respond to disapproval by withdrawing from a state rather than accepting inadequate rates.

How does the SERFF filing system work and can brokers access it?

SERFF (System for Electronic Rate and Form Filing) is the NAIC's electronic filing platform used by carriers and state insurance departments to submit and review rate filings. Nearly all rate filings are submitted through SERFF. Most state insurance departments make SERFF filings publicly available through their websites or through the SERFF Filing Access portal. Brokers can search for their carrier's filings by state and line of coverage on the public SERFF portal. This allows brokers to verify whether a rate filing has been approved, check the effective date of approved rates, and review the rate change percentage that was approved.

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Written by Javier Sanz, Founder of BrokerageAudit. Last updated April 2026.