Reference Guide • Updated May 2026
California Contractor Dual Wage Class Codes
Sixteen California construction trades split their class codes by hourly wage — and the rate difference between low wage and high wage codes can mean tens of thousands of dollars in annual premium. The WCIRB has approved threshold increases of $2 to $5 per hour for 13 of those 16 trades, taking effect September 1, 2026.
What's changing on September 1, 2026
At its November 11, 2025 meeting, the WCIRB Classification and Rating Committee approved a proposal to raise the dual wage threshold for 13 of the 16 construction classifications by $2 to $5 per hour. The change is pending Insurance Commissioner Ricardo Lara's approval and, if accepted, applies to policies incepting on or after September 1, 2026.
The biggest jumps: Carpentry (5403/5432) and Steel Framing (5632/5633) both go from $41 to $46/hr. Electrical (5190/5140) goes from $36 to $40/hr. The three earthwork classes — Excavation, Sewer, and Water/Gas Mains — are still under review.
Interactive Tool
Wage Threshold Calculator
Check whether a given hourly wage qualifies for the high wage classification today — and after September 1, 2026.
Today (current threshold)
Low wage
Class code 5403
Threshold: $41/hr • Wage is $1.00/hr below the line
After Sept 1, 2026 (proposed)
Low wage
Class code 5403
New threshold: $46/hr • Wage is $6.00/hr below the line
Estimates only. Actual classification depends on documented regular hourly wages, verifiable payroll records, and WCIRB rules at the time of audit. Proposed 2026 thresholds pending Insurance Commissioner approval.
How it Works
How dual wage classification works
California's dual wage program dates back to 1986. After a WCIRB study showed that higher-paid construction workers had meaningfully lower injury frequency and claim costs, the Insurance Commissioner authorized splitting selected trades into two classifications — one for the higher-paid (and lower-risk) cohort and one for the lower-paid cohort.
Each pair of class codes covers the same scope of work, but the high wage code carries a meaningfully lower pure premium rate. A simple example: a contractor with $200,000 of payroll in carpentry might pay roughly $14,000 under the high wage code (5432) versus $23,000 under the low wage code (5403) — a 65% difference for the same work, driven only by hourly wage and documentation.
The three things audits check
- Regular hourly wage — the employee's normal pay rate, excluding overtime premium, bonuses, and one-time payments. Salary and piece rate employees get converted to an equivalent hourly rate using WCIRB methodology.
- Hours worked — verifiable through timecards or another timekeeping system. Total payroll alone is not enough.
- Threshold met — the regular hourly wage must equal or exceed the threshold in effect on the policy date. A worker who earns $40.99/hr does not qualify for a $41 threshold.
Miss any of the three and the auditor will assign the employee's payroll to the low wage code — at the higher rate — for the entire audit period. This is by far the most common cause of large unexpected audit bills for California contractors.
Reference
All 16 Dual Wage Classifications
Current thresholds in effect for policies incepting September 1, 2024 or later (unchanged for 2025). Proposed thresholds approved by the WCIRB on November 11, 2025 apply to policies incepting on or after September 1, 2026, pending Commissioner approval.
| Trade | Codes (Low / High) | Current | Change | Sept 2026 |
|---|---|---|---|---|
| Masonry | 5027 / 5028 | $35 | +$2 | $37 |
| Electrical Wiring | 5190 / 5140 | $36 | +$4 | $40 |
| Plumbing / HVAC | 5183 / 5187 | $32 | +$3 | $35 |
| Automatic Sprinkler Install | 5185 / 5186 | $33 | +$3 | $36 |
| Concrete or Cement Work | 5201 / 5205 | $33 | +$3 | $36 |
| Carpentry | 5403 / 5432 | $41 | +$5 | $46 |
| Wallboard Installation | 5446 / 5447 | $41 | +$4 | $45 |
| Glaziers | 5467 / 5470 | $39 | +$4 | $43 |
| Painting / Waterproofing | 5474 / 5482 | $32 | +$4 | $36 |
| Plastering or Stucco Work | 5484 / 5485 | $38 | +$4 | $42 |
| Sheet Metal | 5538 / 5542 | $33 | +$4 | $37 |
| Roofing | 5552 / 5553 | $31 | +$2 | $33 |
| Steel Framing | 5632 / 5633 | $41 | +$5 | $46 |
| Excavation / Grading | 6218 / 6220 | $40 | TBD | — |
| Sewer Construction | 6307 / 6308 | $40 | TBD | — |
| Water / Gas Mains | 6315 / 6316 | $40 | TBD | — |
Sources: WCIRB California Classification and Rating Committee, November 11, 2025 meeting presentation. Current thresholds per WCIRB Table of Dual Wage Classification Thresholds by Year.
Best Practices
How to bulletproof your audit
Keep timecards for every field employee
Daily or weekly time records showing start time, stop time, lunch, and total hours. Paper or digital — both work. Without them, you cannot prove the hourly wage at audit, and the auditor defaults to the low wage code.
Separate regular pay from overtime and bonuses
Overtime premium (the half-time portion of time-and-a-half) is excluded from workers comp payroll and does not count toward the hourly wage threshold. Bonuses and one-time payments also do not count.
Document multi-trade workers carefully
If an employee splits time between trades (e.g., carpentry and roofing), keep hours by classification. Without that breakdown, the entire payroll goes to the highest-rated code.
Get COIs from every subcontractor
An uninsured sub becomes your problem at audit — their payroll gets added to yours and classified under your codes. Collect current certificates of insurance and verify they are active through the audit period.
Model the 2026 threshold change before renewal
Pull a list of every field employee currently within $5/hr of the proposed new threshold. Compare the cost of a small raise to the premium difference between low and high wage codes. The math often favors the raise.
Common Questions
FAQ
What are dual wage class codes in California?
California uses a dual wage classification system for 16 construction trades. Each trade has two class codes — one for "low wage" workers (paid below an hourly threshold) and one for "high wage" workers (paid at or above the threshold). High wage classifications carry significantly lower workers comp rates because higher-paid workers statistically have fewer claims. The program was adopted by the California Insurance Commissioner in 1986.
How much can dual wage classification save on workers comp premium?
Savings can be substantial. For example, in carpentry the high wage class code 5432 might carry a pure premium rate roughly 30-40% lower than the low wage code 5403. On $500,000 of payroll, the difference between paying the high wage rate vs the low wage rate can easily exceed $20,000 per year.
What happens if I cannot prove an employee earned above the threshold?
At audit, if you cannot produce payroll records and timecards showing the employee's regular hourly wage met or exceeded the threshold, the auditor will classify that employee's entire payroll under the low wage code — at the higher rate. This is the single most common cause of large audit bills for California contractors.
Are dual wage thresholds changing in 2026?
Yes. The WCIRB approved proposed threshold increases on November 11, 2025 that would take effect September 1, 2026, pending Insurance Commissioner Ricardo Lara's approval. Thirteen of the 16 dual wage classifications would see increases of $2 to $5 per hour. The largest proposed increases are for carpentry and steel framing (+$5, from $41 to $46) and electrical wiring (+$4, from $36 to $40).
How is "regular hourly wage" defined?
Regular hourly wage means the employee's normal hourly pay rate, not including overtime premiums, bonuses, or other irregular payments. For workers paid by salary or piece rate, the WCIRB has specific rules for converting compensation to an equivalent hourly rate. The wage must be verifiable through payroll records and time records.
Do dual wage codes apply to subcontractors?
Dual wage classifications apply to the workers comp policy of whoever employs the worker. If you use a properly insured subcontractor, their policy handles their own employees' classification. However, if you use an uninsured subcontractor, their payroll is added to yours and classified under your codes — including the dual wage rules.
What if my employees work multiple trades during the day?
The WCIRB has specific division-of-payroll rules. Payroll can only be divided between classifications if the employer maintains time records showing hours spent in each operation. Without those records, all payroll defaults to the highest-rated classification.
Does prevailing wage on public works automatically qualify for high wage?
Often yes, but not automatically. California prevailing wages for most construction trades exceed the dual wage thresholds, so workers on public works projects typically qualify for high wage classification. However, you still must document that the employee actually received the prevailing wage.
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