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California WC Deadline Ruling Speeds Reserve Finality

Mayor turns California's 60-day reconsideration cutoff into a reserve-status control: once the applicable clock and judicial-review window expire, an appeal discount should not remain solely because the claim system still says pending.

By Sam, EditorSeptember 2026 · 3 min read

The California Supreme Court ruled unanimously on August 24, 2026 that the Workers’ Compensation Appeals Board (WCAB) could not equitably toll its own 60-day deadline under the former version of Labor Code section 5909. Ross Valley Sanitation District filed for reconsideration of Joseph Mayor’s total and permanent disability award on March 23, 2023. The WCAB acted 144 days later, more than twice the statutory period.

The court held that the filing-based deadline was mandatory. A petition not acted on within 60 days was denied by operation of law, and the Board could not restart the clock because an administrative irregularity kept the petition from reaching it. The court left open the possibility of narrow due-process relief, but did not define it or apply it here.

Who it affects

The immediate audience is California self-insured cities, sanitation districts, transit agencies, school systems, hospitals, and other employers with litigated workers compensation files. Public entities face the sharper cash issue because a final permanent-disability award can move a large file from an expected-value reserve to required benefit payments and arrears.

This arrives while California public self-insured programs are already absorbing higher medical cost per claim and regional treatment delays are stretching medical development. Mayor addresses a different lever: when uncertainty ends.

Reserve mechanism

The reserve control is the legal finality date, not the date an adjuster eventually changes a claim status. In Mayor, the opinion says the 45-day window for a writ of review expired July 6, 2023, yet the WCAB later granted reconsideration on day 144. The Supreme Court also noted that Mayor had received no compensation since the March 2023 award.

For an employer that reduced an adverse award to reflect a chance of reversal, expiration of the applicable 60-day period and the 45-day judicial-review window can require a step increase in the case reserve. It can also advance cash needs if benefit payments or accumulated amounts become payable. Leaving the file coded “pending reconsideration” after those dates understates case adequacy and delays the development that should enter the reported loss triangle. The distinction between a genuine loss change and an administrative case-reserve change is explained in the case reserve strengthening guide.

The rule for new petitions is different. Current section 5909 retains 60 days but starts the clock when the trial judge transmits the case to the WCAB and gives notice to the parties. Section 5950 generally allows 45 days after denial to seek a writ of review. Claims teams therefore need both the petition date and the transmission notice. One field cannot serve both versions of the law.

What this means for your next review

Put every open California reconsideration file on a legal-calendar exception report. Capture petition filing, trial-judge transmission and notice, WCAB action, deemed denial, writ deadline, and payment start date. Then quantify the case-reserve and 90-day cash effect of removing any appeal discount after finality. The directional call is straightforward: old files governed by the filing trigger should close faster after Mayor, while current files require a transmission-based clock rather than an open-ended “pending” label.

Sources

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