Why did I get a bill after my workers compensation policy ended?

What this assumes

• The policy is a California workers compensation policy written by an insurer rather than a self-insurance arrangement [2].

• The charge follows an audit rather than a mid-term change to the policy.

• You are asking why an amount arrived after the term rather than whether it is correctly calculated.

What changes the answer

• Whether actual payroll exceeded the estimate the charge was built on [1].

• Whether the audit moved payroll into a different classification, since classifications are assigned codes by the WCIRB and insurers generally use them when writing policies [1].

• Whether payroll records distinguish activities well enough to support the split claimed, since the audit works from the records that exist rather than from what was intended.

• Whether an experience modification was applied, and whether it is above or below 100 percent [1].

• Whether the arrangement is insurance at all, since securing compensation by a certificate of consent to self-insure is a different route [2].

Where it varies by state, form, carrier, or fact

• This is the California structure. Other states use different rating bureaus and different rules, and NCCI rather than the WCIRB administers classification in much of the country.

• California operates an open rating system in which individual companies set rates, so two insurers can reach different figures on the same payroll [1].

• This record explains why a post-term charge arises. Whether any particular charge is correct depends on the audit worksheet and the underlying records, which this page cannot see.

Next actions

1. Ask for the audit worksheet and compare the classifications and payroll it used against your own records, rather than against the estimate on the original declarations.

2. Establish which of the three inputs moved: payroll amount, classification assignment, or experience modification [1].

3. If a classification or experience modification is disputed, note that Title 10 of the California Code of Regulations sections 2509.40 through 2509.78 list detailed procedures for disputing them, including appeals to the CDI [1].

4. The WCIRB provides a policyholder ombudsman available to answer employer questions on classification, experience modification and rating issues [1].

5. Keep payroll records that separate distinct activities by employee, because an audit can only credit a split the records actually support.

Source ledger

2 sources. Every citation number above resolves to a record below. Nothing here sits behind an account.

1. [1]

   Workers' Compensation (Commercial Insurance Guide series)(opens the original record on California Department of Insurance)

   California Department of InsuranceRegulatorPrimaryJurisdiction CALast checked August 31, 2026Updates: Updated periodically by CDI; the page carries its own revision date, so re-check it before each content review cycle.ID cdi-wc-commercial-guide

   What this source supports (22)

   • CDI states that all California employers must provide workers compensation benefits to their employees under California Labor Code Section 3700.
   • CDI states that there are five basic types of workers compensation benefits: medical care, temporary disability benefits, permanent disability benefits, supplemental job displacement benefits, and death benefits.
   • CDI states that employers' liability insurance is offered under Part Two of a workers' compensation and employers' liability insurance policy, and that Part Two protects the employer against instances in which an employee's injury or disease is not subject to the workers' compensation laws.
   • CDI states that classifications that group distinct and identifiable occupations, industries, or businesses are developed and assigned codes by the Workers' Compensation Insurance Rating Bureau of California (WCIRB) and are approved by the Insurance Commissioner.
   • CDI states that the payroll for each classification is estimated and then multiplied, per each $100 of payroll, by the applicable rate.
   • CDI states that generally an experience modification of less than 100 percent reflects better-than-average experience and an experience modification of more than 100 percent reflects worse-than-average experience, and describes the modification as comparing an employer's loss history against similar-sized employers in the same industry classification.
   • CDI states that California workers compensation insurers operate under an open rating system, meaning individual companies set rates based on their ability to adequately cover losses and expenses in each industry classification.
   • CDI states that workers' compensation insurers assign a specific rate to each industry classification code and that these rates must be filed with the CDI.
   • CDI states that the final premium of a workers' compensation policy cannot be calculated until the policy term is over and the employer's payroll records have been audited.
   • CDI states that a dividend plan is a type of rating plan that allows an employer to share in the profits of its workers' compensation insurer in the form of a dividend.
   • CDI states that to become self-insured a business must obtain a certificate from the DIR's Office of Self-Insurance Plans (OSIP).
   • CDI states that State Fund is a state-operated entity that exists in order to transact workers' compensation on a non-profit basis, competes with private workers' compensation insurance companies for business, and also operates as the insurer of last resort if private companies are not willing to offer workers' compensation insurance.
   • Classifications that group distinct and identifiable occupations, industries, or business are developed and assigned codes by the Workers' Compensation Insurance Rating Bureau of California (WCIRB) and are approved by the Insurance Commissioner.
   • Workers' compensation insurers generally use these classifications when writing workers' compensation policies.
   • Insurance companies are allowed to develop and submit their own classification system to the CDI for approval, but this is uncommon due to the strict standards required to file a separate workers' compensation classification system.
   • The payroll for each classification is estimated and then multiplied, per each $100 of payroll, by the applicable rate, and the sum of the equation is referred to as the base premium.
   • The base premium continues to be modified, increased or decreased, using rating plans (usually schedule or judgment rating) and by experience modification.
   • An employer's experience modification is calculated from payroll and loss information that insurance companies are required to submit to the WCIRB on an annual basis, using a mathematical formula approved by the CDI.
   • An experience modification of less than 100 percent reflects better-than-average experience, and an experience modification of more than 100 percent reflects worse-than-average experience.
   • The WCIRB provides a policyholder ombudsman, who is available to answer questions from employers on classification, experience modification, and rating issues.
   • The final premium of a workers' compensation policy cannot be calculated until the policy term is over and the employer's payroll records have been audited.
   • Title 10, California Code of Regulations Sections 2509.40 through 2509.78 list detailed procedures for disputing experience modifications and classification assignments, including appeals to the CDI.

   Published: 2025-06-23

   Active
2. [2]

   California Labor Code section 3700(opens the original record on California Legislative Information (Legislative Counsel of California))

   California Legislative Information (Legislative Counsel of California)Primary lawPrimaryJurisdiction CALast checked August 31, 2026Updates: Amended by the Legislature; check leginfo for the current text each session.ID lab-3700

   What this source supports (5)

   • The section opens: Every employer except the state shall secure the payment of compensation in one or more of the following ways.
   • One listed method is being insured against liability to pay compensation by one or more insurers duly authorized to write compensation insurance in California.
   • Another listed method is securing from the Director of Industrial Relations a certificate of consent to self-insure, either as an individual employer or as one employer in a group of employers.
   • A further listed method applies to political subdivisions and public entities, which may secure a certificate of consent to self-insure against workers compensation claims.
   • The section as displayed carries the amendment note: Amended by Stats. 2002, Ch. 905, Sec. 10. Effective January 1, 2003.

   Effective: 2003-01-01

   Active

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