Guides
Commercial rate filing: prior approval, file-and-use and deregulation
How states regulate commercial rates and forms: prior approval, file-and-use, use-and-file, flex rating, large-risk exemptions, and how SERFF works.
Rate filing is how a state oversees what admitted insurers charge. In a prior-approval state the insurer must get the regulator's sign-off before using a new rate; in file-and-use states it files first and may use the rate after a waiting period or right away; in use-and-file states it files after the fact; and a few lines or large accounts need no filing at all. Commercial lines are regulated far more lightly than personal auto and homeowners, and surplus lines insurers, which are not admitted, generally do not file.
Rates, rules, loss costs and forms
An insurance filing has several parts, and states often treat them differently.
- Rates are the prices per unit of exposure: per $100 of payroll for workers' compensation, per $100 of building value for property, per $1,000 of sales or per unit of area for general liability.
- Rating rules set how rates are applied: classification, territory, deductible credits, increased limits factors.
- Loss costs are the portion of the rate that covers expected claims and loss adjustment expense without the insurer's expenses and profit. Advisory organizations such as ISO and NCCI file loss costs, and each insurer adds its own loss cost multiplier.
- Forms are the policy wording and endorsements, such as the ISO commercial general liability form CG 00 01 or the NCCI workers' compensation policy WC 00 00 00 (ISO forms and why most commercial policies look alike).
- Schedule rating plans let the insurer apply debits or credits within a filed range to reflect individual risk characteristics (schedule rating).
The filing systems
The NAIC and regulators commonly describe these systems. A state may use different ones for different lines.
| System | How it works | Typical use |
|---|---|---|
| Prior approval | The insurer files and cannot use the rate or form until the regulator approves it (or a deemed-approval period passes) | Workers' comp in many states; personal lines in many states |
| File-and-use | The insurer files before use, or within a short period, and may use the rate once filed or after a short waiting period; the regulator can disapprove later | Much of commercial property and liability |
| Use-and-file | The insurer uses the rate and files it within a set number of days | Some commercial lines |
| Flex rating | Prior approval is needed only if the change exceeds a band, such as plus or minus a set percentage | Some lines in some states |
| No-file or open competition | No filing, or filing for information; the market sets the price | Some large commercial risks, some lines, surplus lines |
Which one applies to you depends on the state, the line, the size of the risk and whether the insurer is admitted. The statutes differ in detail and the Department of Insurance's website is the authority. Use the workers' comp and benefits requirements by state to find your state guide.
Why commercial lines are lighter
Regulators generally assume commercial buyers have more sophistication and bargaining power than households, so states exempt many commercial lines or large accounts from the strictest controls. Common features:
- Large commercial risk exemptions. Many states let insurers negotiate rates and forms for accounts above a premium or size threshold without filing. Definitions vary by state, so a mid-sized account may fall on either side.
- Specific lines. Marine, aviation, surety and some professional and cyber coverages are commonly exempt or lightly filed.
- Individual risk rating. Even with filed plans, underwriters apply schedule credits and debits. The rate the insurer files is rarely the price a middle-market insured pays.
- Workers' compensation is the exception. Most states regulate it more tightly. Many states use NCCI loss-cost filings with insurers' multipliers, some states run their own bureaus, and monopolistic funds set their own rates (monopolistic state fund). California uses open rating: insurers set their own rates, while the Insurance Commissioner publishes an advisory pure premium rate. The commissioner's September 2026 advisory pure premium rate was $1.65 per $100 of payroll, up 6.6%, per the California Department of Insurance (release 024-2026) (California; workers' comp trends: frequency, severity and rates in 2026).
Surplus lines and manuscript wording
A non-admitted insurer is not bound by the state's filing requirements for rates and forms, which is a large part of why risks that do not fit filed programs end up there (excess and surplus lines insurance explained). The tradeoffs are fewer rate controls and no guaranty fund. Likewise, a manuscript endorsement agreed between an insurer and a large insured may fall under an exemption in states that allow it. See admitted vs non-admitted insurers: what the difference means.
SERFF
SERFF, the System for Electronic Rate and Form Filing, is the NAIC-run electronic platform through which insurers submit filings to participating state regulators and the state reviews and responds. For the insured it matters in two ways: it creates a public or semi-public record of filed rates and forms in many states, and it speeds up uniform filings. Some states make filings searchable through a SERFF Filing Access portal or on their own sites, which a broker or risk manager can use to see whether an endorsement or rate plan was filed. See The NAIC: what it does and why it matters.
What it means at renewal
- A rate change did not always go through a regulator. In file-and-use and exempt segments, the insurer set its own rates.
- Your price still depends on underwriting. The filed rate is a starting point; schedule credits, your experience and loss history, retentions and market conditions change the premium (experience modification rate for comp).
- Form changes need to be filed, so a new exclusion on a standard line should usually appear in a filing. If you suspect an endorsement was not filed, ask your broker to check the state's filing database or contact the department (state insurance departments and what they can do for businesses).
- Large accounts can negotiate. If you exceed a state's large-risk threshold, the insurer can quote any rate and form it chooses and you can negotiate wording that a filed program would not allow.
A hypothetical
Say a 150-employee distributor in a file-and-use state renews its package policy. The insurer files a rate revision under that system, and a new water-damage sublimit endorsement is filed the same way. The account's premium is above the threshold the insurer uses for individual risk pricing, so the underwriter quotes using schedule credits and offers the broker a manuscript endorsement. In a prior-approval state for the same line, the new rate and endorsement could have waited for approval before it was used. Check your own state (for example Texas or New York) rather than assuming either.
Key takeaways
- Prior approval, file-and-use, use-and-file, flex rating and no-file describe how much review happens before an insurer uses a rate or form.
- Commercial lines are lightly regulated; large risks and surplus lines carry the fewest controls.
- Workers' compensation is generally the most regulated commercial line, but even there, states differ (California uses open rating with an advisory pure premium rate).
- SERFF is the NAIC's electronic filing system; filings are one way to check what an insurer has filed.
- Your premium is the product of filed rates, rating rules and underwriting judgment, so ask your broker which components were negotiable.