The OSHA EMR rate is a common misnomer: OSHA does not calculate or assign it. Your Experience Modification Rate comes from the National Council on Compensation Insurance or your state’s independent rating bureau, and it measures how your company’s workers’ compensation loss history compares to other businesses of similar size in your industry. A score of 1.0 matches the industry average. Below 1.0 means you’re outperforming your peers. Above 1.0 means your claim history is worse, and you’ll pay for it in two ways: higher workers’ comp premiums, and lost bidding opportunities on projects that set an EMR ceiling.
How Your EMR Changes What You Pay
The EMR is a multiplier applied to your manual workers’ compensation premium. Manual premium × EMR = modified premium. On a $100,000 base, an EMR of 0.75 produces a $75,000 bill. An EMR of 1.25 turns the same base into $125,000. That 50-point swing costs $50,000 a year on a single mid-sized policy.1National Council on Compensation Insurance. ABCs of Experience Rating
The manual premium itself depends on your payroll and your classification codes. Each code carries a rate per $100 of payroll that reflects the risk of the work. A clerical code might sit below $1.00 per $100. A roofing code can top $60.00. The EMR adjusts the total up or down based on your actual loss history.1National Council on Compensation Insurance. ABCs of Experience Rating
Who Calculates Your EMR and Whether You Qualify
NCCI handles experience rating in roughly 38 states plus the District of Columbia. Eleven states run their own independent bureaus: California, Delaware, Indiana, Massachusetts, Michigan, Minnesota, New Jersey, New York, North Carolina, Pennsylvania, and Wisconsin.2ICRB. Independent Bureaus, NCCI and WCIO If your business operates in one of those states, formulas and thresholds may differ from the NCCI standard.
Not every employer gets an EMR. You have to meet a minimum premium threshold. The exact figure varies by state, but many states require roughly $10,000 to $15,000 in audited premium over the most recent two years of the experience period, or a lower annual average across the three-year window.3National Council on Compensation Insurance. ABCs of Experience Rating Businesses below the threshold pay straight manual rates and receive no modifier.
How the Calculation Works
The EMR draws from three full years of policy data, but skips the most recent completed policy year. That gap gives recent claims time to develop, since a claim filed six months ago hasn’t reached its final cost.4North Carolina Rate Bureau. Experience Modification Calculator – Instructions An EMR effective January 1, 2026, typically pulls from policy years ending in 2022, 2023, and 2024.
Two data sets feed the formula. The first is payroll by classification code, which your insurer audits annually and assigns to job classifications based on the work employees actually perform. The second is loss runs: detailed reports of every workers’ comp claim filed during the experience period, including medical costs and indemnity payments for lost wages. Both come from your insurer’s audited records.
At its core, the formula compares your actual losses to your expected losses. Expected losses come from multiplying an Expected Loss Rate for each classification code by the payroll in that code. Add those figures across all your classifications and you have the benchmark your actual performance is measured against.1National Council on Compensation Insurance. ABCs of Experience Rating
A stabilizing element called the ballast value keeps the EMR from swinging wildly. It grows with your expected losses, so larger employers see less volatility from any single claim. Ballast is added to both sides of the equation, pulling the result closer to 1.0 so one catastrophic event can’t single-handedly wreck a large employer’s rating.1National Council on Compensation Insurance. ABCs of Experience Rating The final EMR is the ratio of your adjusted actual losses to your adjusted expected losses.
Why Frequency Hurts More Than Severity
The formula doesn’t treat all claim dollars equally. Each individual claim is split into primary losses and excess losses at a dollar threshold called the split point, which commonly falls between $14,500 and $18,500 depending on the state. Primary losses (the dollars below the split point on any single claim) carry heavy weight. Excess losses carry much less.
The practical consequence: five $10,000 claims damage your EMR more than one $50,000 claim, because each smaller claim loads most of its value into the heavily weighted primary bucket. Claim frequency, not claim size, is what really drives the number.
How OSHA Recordkeeping Fits In
OSHA doesn’t produce your EMR, but the two systems track overlapping events. Most employers must maintain an OSHA 300 log for recordable work-related injuries and illnesses.5eCFR. 29 CFR Part 1904 – Recording and Reporting Occupational Injuries and Illnesses Many of those same incidents trigger workers’ comp claims that then feed your EMR. The Total Recordable Incident Rate counts recordable injuries per 200,000 hours worked and measures frequency.6U.S. Bureau of Labor Statistics. How To Compute Your Firms Incidence Rate for Safety Management The EMR measures financial impact on your workers’ comp policy. Same events, different lenses. Inconsistencies between the two records raise flags in audits, so keeping them aligned is worth the effort.
Impact on Bidding and Contract Eligibility
In construction and industrial work, your EMR often functions as a pass-fail gate before anyone looks at your price. Most general contractors and project owners require subcontractors to carry an EMR below 1.0 for standard commercial and industrial projects. High-hazard work like refinery turnarounds and chemical plant maintenance often sets the bar at 0.85 or lower. An EMR above 1.25 frequently produces automatic bid rejection regardless of price or technical qualifications.
Prequalification platforms like ISNetworld and Avetta collect and publish EMR data as part of contractor vetting. If your EMR exceeds a project owner’s threshold, the platform flags you as non-compliant before a human reviewer ever sees your submission. An elevated EMR silently eliminates revenue opportunities you may never know you lost.
How to Access Your EMR Worksheet
Your Experience Rating Worksheet is the official document showing every input that produced your number: payroll by classification, individual claim values, expected losses, and the final calculation. In NCCI states, current and historical worksheets are available through NCCI’s online portal using your Federal Employer Identification Number. Your insurance agent can pull the worksheet on your behalf, though a letter of authority may be required. In independent bureau states, contact the state rating bureau directly.
Line-by-line review is where most employers find correctable errors. Common mistakes include payroll assigned to the wrong classification code, claims attributed to the wrong policy year, and claim values that haven’t been updated to reflect settlements or closures. NCCI’s Experience Rating Production Service monitors ratings for revisions triggered by classification inspections and reporting error corrections, and recalculates when adjustments are warranted.7NCCI. Experience Rating Production Service The system only catches what someone identifies. If you don’t review your worksheet, nobody else is looking out for you.
Disputing Errors
Start with your insurance carrier. Most corrections, especially updated reserves and closed-claim adjustments, flow through the carrier because the carrier reported the original data. If the carrier can’t or won’t resolve the issue, you can escalate to NCCI’s formal dispute resolution process. You’ll submit a written request that includes an estimate of the premium in dispute, proof that you’ve paid all undisputed premium, a written explanation of the calculation error, and documentation of your attempts to resolve the dispute with the carrier.8NCCI. Dispute Resolution Process
The most impactful corrections tend to involve claims settled or closed for less than the original reserve. Insurers set reserves early using worst-case estimates, and those inflated figures sit in your EMR calculation until someone updates them. Ask your carrier for fresh loss runs every six months and compare them against the worksheet.
How to Lower Your EMR
Claims stay in the experience period for three years, so every injury will affect the number long after the employee returns to work. Prevention is the highest-value strategy. Beyond that, four approaches reduce the financial impact of the injuries that do occur.
- Return-to-work programs. Getting an injured employee back on modified or light duty as quickly as medically appropriate converts an indemnity claim (lost wages plus medical) into a medical-only claim. Medical-only claims are reduced by 70% before entering the EMR calculation, so a $15,000 medical-only claim counts as roughly $4,500 in the formula, while the same $15,000 with any lost-time component counts at full value.9NCCI. Experience Rating Plan Methodology Update Filing Summary
- Classification code audits. Payroll assigned to a higher-risk code than the actual work warrants inflates your expected losses and your base premium. Review classifications with your agent before the annual audit, not after.
- Active claims management. Stay involved in open claims. Challenge inflated medical bills, confirm treatment is progressing, and push for timely closure. An open claim with a high reserve costs more than a closed claim settled for a known amount.
- Worksheet review. Errors in reported data directly inflate your EMR. Treat the annual worksheet review as a financial audit rather than a filing exercise.
The 70% medical-only reduction is one of the most underused levers available to employers. Many businesses have no formal light-duty program, so even minor injuries produce a few days off work and convert what could have been a discounted medical-only claim into a fully weighted lost-time claim. Once you see how it flows through the formula, the math on building a light-duty program almost always pencils out.