What the multiplier does
The workers compensation multiplier adjusts your premium when you add payroll beyond the base amount used to set the rate, ensuring the insurer charges proportionally for the extra exposure.
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How it is calculated
First, determine the base payroll used to establish the original premium. Then add the additional payroll amount. The multiplier is the ratio of total payroll to base payroll, expressed as a decimal. Multiply the original premium by this ratio to get the adjusted premium.
Typical multiplier ranges
| Base payroll size | Additional payroll | Resulting multiplier |
|---|---|---|
| Up to $50,000 | $0‑$10,000 | 1.00‑1.20 |
| $50,001‑$200,000 | $10,001‑$50,000 | 1.10‑1.35 |
| Over $200,000 | Any increase | 1.15‑1.50 |
Factors that affect the multiplier
- Industry classification: Higher‑risk classes often have steeper multiplier increments.
- State regulations: Some states cap the multiplier or require specific reporting thresholds.
- Policy terms: Blanket policies may use a flat multiplier, while per‑employee policies calculate it per payroll segment.
Reporting additional payroll
Accurate reporting is critical. Submit the new payroll figures by the deadline specified in your policy—typically within 30 days of the change—to avoid retroactive premium adjustments or penalties.
Best practices for managing multipliers
Maintain detailed payroll records, review your classification codes annually, and use payroll software that can generate reports aligned with workers compensation filing requirements. When in doubt, consult your insurer or a certified risk manager to verify the multiplier applied.