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By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization
In California, Labor Code section 4660.1 — the SB 863 strict-rating formula — applies to industrial injuries occurring on or after January 1, 2013. The section 4660.1 California rule replaced the §4660 future-earning-capacity multiplier with a fixed 1.4 adjustment and limited add-ons for psychiatric and sleep impairments.
California Labor Code section 4660.1 — enacted by SB 863 and applicable to industrial injuries occurring on or after January 1, 2013 — sets the strict permanent-disability rating formula that replaced the older California Labor Code §4660 California future-earning-capacity multiplier for post-2013 California claims. Under section 4660.1, the California whole-person impairment from the AMA Guides is multiplied by a fixed 1.4 adjustment and then adjusted for age and occupation under the California Labor Code §4660 California rating-schedule mechanics. The section 4660.1 California formula was designed to make permanent-disability ratings more predictable and to tighten the boundaries on psychiatric add-on impairments that had grown under earlier law.
Under California Labor Code section 4660.1, the SB 863 formula replaced the variable California Labor Code §4660 California future-earning-capacity (FEC) multiplier — which had ranged from 1.1 to 1.4 depending on the body part and impairment — with a single fixed 1.4 adjustment applied to every post-2013 California claim. The section 4660.1 California rule eliminated the body-part-by-body-part FEC differential, simplifying the California PD rating calculation. The pre-2013 California Labor Code §4660 California FEC multiplier still applies to industrial injuries with a pre-2013 date of injury; the date-of-injury rule governs whether California Labor Code §4660 California or section 4660.1 California governs the rating.
Under California Labor Code section 4660.1, psychiatric add-on impairments are restricted for post-2013 California claims — psychiatric impairment cannot be added to the rating unless it arises from one of two narrow circumstances: (1) a violent act or direct exposure to a significant violent act, or (2) a catastrophic injury including loss of limb, paralysis, severe burns, or severe head injury. The section 4660.1 California restriction was a substantial tightening of pre-2013 California law that had allowed psychiatric add-on for most serious industrial injuries. The section 4660.1 California rule does not affect standalone psychiatric claims under California Labor Code §3208.3 California — those are separately governed.
Under California Labor Code section 4660.1, sleep-impairment and sexual-dysfunction add-on impairments are barred for post-2013 California claims in most circumstances — these add-ons cannot be added to the California PD rating except in the same narrow violent-act or catastrophic-injury contexts that allow psychiatric add-on. The section 4660.1 California restriction reflected the SB 863 California compromise to curb add-on growth in exchange for higher overall PD payment levels under California Labor Code §4658 California. The section 4660.1 California rule means a post-2013 California worker with chronic pain and sleep disruption typically cannot get a sleep add-on rated into the PD calculation.
Under California Labor Code section 4660.1, California Labor Code §4660 (rating mechanics), California Labor Code §4663 (apportionment), and California Labor Code §4658 (PD payment schedule), the California 2013-onward PD framework operates as a layered system. Section 4660.1 California sets the rating formula (1.4 adjustment, restricted add-ons); California Labor Code §4660 California then applies the age and occupation adjustments; California Labor Code §4663 California carves out non-industrial apportionment; and California Labor Code §4658 California pays out the final rating on the weeks-payable schedule. For post-2013 California injuries, section 4660.1 California is the front-end of every PD calculation.
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Tap to call →Last reviewed by Eman Yazdchi, Esq., May 2026.
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