California Self-Insurance Law: Application, Deposit, and Reporting

California lets an employer pay its own workers’ compensation claims instead of buying a policy, but only after the state’s Office of Self-Insurance Plans (OSIP) grants a Certificate of Consent to Self-Insure. California self-insurance for workers’ compensation is regulated under Labor Code Section 3700, and it demands a $5 million net worth, three years of audited financials, a licensed third-party claims administrator, and an annually recalculated security deposit that stays posted for as long as any claim remains open.¹

Who Can Self-Insure

Labor Code Section 3700 gives every private employer three ways to meet its workers’ compensation obligation: buy a policy from a licensed insurer, obtain a certificate to self-insure individually, or join a group self-insurance certificate. Public entities self-insure under a separate provision of the same statute.¹

Three structures exist under OSIP:

Individual private self-insurance, where one company assumes its own liabilities. This is the path most large corporations take, and the requirements below focus on it.
Group self-insurance, where unrelated private employers in the same or related industries pool their risks under a single certificate. Groups must carry specific excess insurance from an admitted California carrier.²
Public entity self-insurance, for cities, counties, school districts, and other political subdivisions, which follows a separate rule set focused on claims administration rather than private-sector financial thresholds.

Financial Requirements

The financial bar for individual private self-insurance is intentionally steep, because OSIP has to be confident the employer can absorb years of claim costs without failing. An applicant must demonstrate all of the following:

At least three calendar years in business in a legally authorized business form such as a corporation, partnership, or nonprofit.³
Three years of certified, independently audited financial statements prepared by a CPA.⁴
A current net worth of at least $5 million.
Average net income of at least $500,000 over the preceding five years.⁵
Three consecutive years of satisfactory creditworthiness as assessed by OSIP.

None of these are one-time hurdles. The employer must maintain each standard for every year it holds a certificate. A marked reduction in financial strength, loss of the minimum net worth, or failure to produce audited statements gives the Director of Industrial Relations grounds to raise the security deposit or revoke the certificate outright.⁵

If the applicant is a subsidiary, the parent must execute a Guaranty of Workers’ Compensation Liabilities (Form A-4), backing the subsidiary’s obligations with parent-level resources.

Claims Administration and TPAs

Financial capacity is only half of what OSIP looks at. The employer also has to run a competent claims operation from the first day of coverage. For the first three years after certification, every new self-insurer must contract with a licensed Third-Party Administrator. No exceptions.³ The TPA must be separately licensed by OSIP and must adjust all claims within California.

After three years, an employer can apply to bring claims administration in-house. OSIP certifies individual administrators through an examination offered throughout the year, and internal claims handling requires that certification.³

The Application

Private employers apply on Form A-1, the Application for Certificate of Consent to Self-Insure, available from OSIP.⁶ A non-refundable $500 filing fee goes with it.⁷

The application package includes:

Three years of certified, independently audited financials, plus a current unaudited financial statement or published quarterly report.
A corporate resolution on Form A-5 authorizing the company to pursue self-insurance.
The Agreement and Undertaking for Security Deposit on Form A-6.
For a subsidiary, the parent guaranty on Form A-4.

OSIP’s review of a complete application from a new private employer takes roughly 21 days from receipt to a decision.³ That assumes a properly completed package. Missing documents or financial red flags extend the process, and OSIP may run a pre-certification audit to verify readiness before issuing the certificate.

The Security Deposit

The security deposit is the financial backstop that protects injured workers if a self-insured employer defaults. Labor Code Section 3701 requires every private self-insurer to post and maintain a deposit each year with the Director of Industrial Relations.⁸

The amount equals the employer’s projected losses as of December 31 each year. That projection covers liabilities for claims already reported, claims incurred but not yet reported, allocated loss adjustment expenses, and unallocated loss adjustment expenses, reduced by any specific excess insurance coverage the employer carries.⁸ A qualified actuary prepares the estimate, and the supporting actuarial study goes to OSIP annually.

The deposit can take the form of a surety bond, an irrevocable letter of credit from a financial institution, approved securities, or cash held in trust. A renewed existing deposit continues from year to year; a new deposit must be in place within 60 days of filing the annual report and no later than May 1. Missing that deadline puts the certificate at risk.⁸

If the employer defaults on its obligations, it loses all right and interest in the deposit. The Director can liquidate the posted assets and apply the proceeds to outstanding liabilities, either directly or through the Self-Insurers’ Security Fund.

Excess Insurance

Individual private self-insurers are not required to carry excess (stop-loss) insurance, but most do because a single catastrophic claim or a bad year can generate exposure that dwarfs ordinary reserves. Specific excess coverage caps liability on any one claim above a chosen retention. Aggregate excess coverage caps total annual claim payments across all claims.

Group self-insurers follow a different rule. They must maintain specific excess workers’ compensation insurance from an admitted carrier authorized in California, though aggregate excess coverage remains optional and earns no security deposit credit.² Any specific excess insurance an individual or group self-insurer carries does reduce the required security deposit, because the statute calculates the deposit net of that coverage.

Ongoing Compliance

Certification is the start, not the end. Several obligations run for the life of the certificate.

Annual Report and Actuarial Study

Every private self-insurer files the Self-Insurer’s Annual Report (Form AR-1) with OSIP by March 1 each year, covering claim activity, financial data, and open indemnity claims.⁹ The actuarial study that supports the coming year’s security deposit is filed alongside.

Audits

OSIP audits every private self-insured employer on a three-year cycle, reviewing claims-handling practices and reserve adequacy.¹⁰ The Division of Workers’ Compensation’s Audit and Enforcement Unit separately reviews whether self-insurers and their TPAs have met their Labor Code obligations.¹¹ Poor audit results can trigger increased security deposit requirements or enforcement action.

Security Fund Assessments

Membership in the Self-Insurers’ Security Fund (SISF) is a condition of keeping the certificate. The fund covers claims when a self-insured employer becomes insolvent and its security deposit is insufficient. Members pay pro rata assessments, capped so that no single assessment exceeds 1.5 percent of the benefits the member paid on claims during the prior calendar year, and total annual assessments cannot exceed 2 percent of those benefits.¹² These assessments are not optional, and they represent a recurring cost that employers sometimes overlook when comparing self-insurance to a traditional policy.

Leaving Self-Insurance

The Director can revoke a certificate for good cause after issuing a Notice of Intent describing the grounds and giving the employer an opportunity for a hearing.¹³ Grounds include a significant decline in financial strength, dropping below the minimum net worth, failure to maintain audited statements, or serious deficiencies in claims administration.

An employer can also request voluntary revocation at any time by notifying OSIP in writing. Ending the certificate does not end existing claims. The Director will only revoke it after the employer has established a program to discharge all liabilities and responsibilities incurred while the certificate was active.¹⁴ Serious workers’ compensation claims can remain open for years or decades, and the employer must keep paying them, maintaining reserves, and posting a security deposit throughout the entire runoff period.

A Tax Timing Trap

Self-insured employers sometimes assume they can deduct estimated claim liabilities as they accrue. They cannot. Under IRC Section 461(h), workers’ compensation liabilities are subject to a strict economic performance rule, and the deduction is available only as payments are actually made to injured workers or medical providers, not when the liability is estimated or reserved.¹⁵

The recurring item exception that lets accrual-basis taxpayers deduct certain expenses within eight and a half months after year-end does not apply here. Congress explicitly carved workers’ compensation and tort liabilities out of that relief.¹⁵ The result is a timing mismatch: the employer books a large actuarial reserve on its financial statements but cannot deduct those amounts until checks clear. For employers with long-tail claims, that mismatch is a real cost, and it needs to sit on the same page as premium savings when weighing self-insurance against a traditional policy, where premiums are deductible when paid.

1
California Legislative Information. California Code Labor Code 3700
2
Department of Industrial Relations. California Code of Regulations Title 8 Section 15478 – Excess Insurance
3
Department of Industrial Relations. Overview and Requirements for Becoming Self-Insured
4
Legal Information Institute. California Code of Regulations Title 8 15203.2 – Continuing Financial Capacity for Individual Private Self-Insurers
5
Department of Industrial Relations. California Code of Regulations Article 2 Sections 15203-15205
6
Department of Industrial Relations. Application for Certificate of Consent to Self-Insure as a Private Employer
7
Department of Industrial Relations. California Code of Regulations Title 8 Section 15204 – Application Filing Fee
8
California Legislative Information. California Code Labor Code 3701
9
Legal Information Institute. California Code of Regulations Title 8 15251 – Self-Insurer’s Annual Report
10
Office of Self-Insurance Plans. Audit Methodology and Random Selection
11
Division of Workers’ Compensation. DWC Audit and Enforcement Unit
12
Justia. California Code Labor Code 3740-3747 – Self-Insurers’ Security Fund
13
Department of Industrial Relations. California Code of Regulations Title 8 Section 15423 – Revocation
14
Department of Industrial Relations. California Code of Regulations Title 8 Section 15422 – Voluntary Revocation
15
Office of the Law Revision Counsel. 26 USC 461 – General Rule for Taxable Year of Deduction