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California Labor Code §4660.1 — Strict-Rating Formula for 2013-Onward Injuries
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By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization · Cal Bar #285231
(a) In determining the percentages of permanent partial or permanent total disability, account shall be taken of the nature of the physical injury or disfigurement, the occupation of the injured employee, and the employee's age at the time of injury.
What does California Labor Code section 4660.1 establish?
Section 4660.1 sets the strict permanent disability rating formula applied to every California injury occurring on or after January 1, 2013.
Section 4660.1 is the rule that sets the strict permanent disability rating formula for every California injury occurring on or after January 1, 2013, replacing the older multiplier system and tightening the rules on psychiatric, sleep, and sexual-dysfunction add-ons. The PD rating drives the final award. Certified Specialist Eman Yazdchi (California Board of Legal Specialization, State Bar of California) handles strict-formula rating cases.
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 §4660 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 §4660 rating-schedule mechanics. The section 4660.1 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.
How does section 4660.1 California change the §4660 future-earning-capacity multiplier?
The strict formula eliminates the older Future Earning Capacity multiplier and uses the AMA Guides 5th Edition impairment percentage as the rating base.
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.
How does section 4660.1 California restrict psychiatric add-on impairments?
Psychiatric add-on impairments are barred unless the injury arose from a violent act or a catastrophic event involving threat to life.
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.
How does section 4660.1 California treat sleep and sexual-dysfunction add-ons?
Sleep and sexual-dysfunction add-ons are similarly restricted under the strict formula and are only available in narrow circumstances.
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.
How does section 4660.1 California interact with §4658, §4663, and §4660 rating mechanics?
The rating mechanics still run through PD payment scaling, apportionment under the related rule, and the standard rating-schedule conversion.
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.
Related on yazdchilaw.com: California workers' comp settlement pillar · California Labor Code §4061.1 explained · California Labor Code §4663 (apportionment) · What happens at a mandatory settlement conference in california workers comp.
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What does California Labor Code section 4660.1 establish for 2013-onward injuries?
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 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.
How does section 4660.1 California change the §4660 future-earning-capacity multiplier?
Under California Labor Code section 4660.1, the SB 863 formula replaced the variable California Labor Code §4660 California FEC multiplier, which had ranged from 1.1 to 1.4 depending on the body part, 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 governs the rating.
How does section 4660.1 California restrict psychiatric add-on impairments?
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 rule does not affect standalone psychiatric claims under California Labor Code §3208.3 California.
How does section 4660.1 California treat sleep and sexual-dysfunction add-ons?
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.
How does section 4660.1 California interact with §4658, §4663, and §4660 rating mechanics?
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.
Last reviewed by Eman Yazdchi, Esq., June 2026.
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