Workers Comp Experience Mod 2027 Calculator

Your Experience Modifier (EMR) directly multiplies workers comp premium. A 1.20 EMR adds 20% to every dollar; a 0.85 EMR saves 15%. This 2027 tool shows what your claims history is costing — and how much one safe year could save.

How EMR Is Calculated By NCCI

NCCI uses 3 years of payroll and losses, dropping the most recent year (e.g., a 2027 EMR uses 2023-2025 data). Formula: EMR = (Actual Primary Losses + Stabilizing Value + Weighting × Excess Losses) ÷ (Expected Losses + Stabilizing Value). Expected losses = Manual Premium × Expected Loss Ratio (about 65%). Each lost-time claim's first $5K is "primary" (full weight); amounts above are "excess" (about 10% weight). Medical-only claims get a 30% Experience Rating Adjustment (ERA) discount.

Why EMR Is The Most Important Number In Workers Comp

EMR multiplies every dollar of premium. A 1.40 EMR on $50K base premium = $70K total — $20K extra every year. Over 3 years, that's $60K — enough to fund a full safety officer. EMR also signals risk to GCs and prime contractors. Public bids commonly require EMR ≤ 1.00 to qualify; many manufacturing customers require ≤ 0.90 for vendor approval. Losing a $500K contract because of a 1.15 EMR isn't hypothetical — it happens monthly.

How To Lower Your EMR

Aggressive return-to-work: every day a claim is open as lost-time, it costs more EMR. Light-duty programs close claims as medical-only (30% ERA discount). Report fast: claims reported within 24 hours close 50% faster and cost 50% less. Drug-free workplace: most states give 5-7.5% premium credit. Annual safety committee meetings: documented programs unlock 5-10% credit. Audit claim files: closed-but-open claims sitting at reserve inflate EMR — push the carrier to close them.

EMR Mistakes That Cost Contracts

(1) Reporting late — claims reported 7+ days after the incident close 50% slower and cost 50% more, both hurting EMR. (2) Letting medical-only claims convert to lost-time — even one day of lost time disqualifies the 30% ERA discount. Aggressive return-to-work with light duty keeps the discount. (3) Carrying open reserves on closed claims — insurers often leave reserves on claims that paid out months ago, inflating EMR. Demand quarterly reserve reviews. (4) Not bidding insurance every 3 years — pricing varies 20-40% between carriers for identical EMR; complacency is expensive.

Last updated May 2026. Sources cited in tool output.