An experience modification factor (EMR), also called an X-Mod or experience mod, is a numerical multiplier applied to your workers' compensation base premium. It is calculated by NCCI based on your company's actual claims history compared to the expected claims history for businesses of your size and type.

An EMR of 1.0 is the industry average — your premium is neither increased nor decreased. An EMR below 1.0 (say, 0.85) means your claims history is better than average, and your premium is reduced by 15%. An EMR above 1.0 (say, 1.25) means your claims history is worse than average, and your premium is increased by 25%.

For a business with a $100,000 base premium, the difference between an EMR of 0.85 and 1.25 is $40,000 per year. Over a five-year period, that's $200,000 — money that could fund equipment, hiring, or growth. Your EMR is one of the most financially significant numbers in your business.

NCCI calculates your EMR using three years of claims data, excluding the most recent policy year (which is not yet fully developed). So in 2026, your EMR is based on policy years 2022, 2023, and 2024.

The calculation compares your actual losses (what your claims actually cost) against your expected losses (what NCCI predicts a business of your size and type would have). The formula gives more weight to the frequency of claims than to the severity of individual claims. This is an important insight: having many small claims can hurt your EMR more than having one large claim.

The formula also applies a split point — currently $17,500 in Florida. Losses below the split point (primary losses) are counted dollar-for-dollar in the formula. Losses above the split point (excess losses) are discounted. This means that a $50,000 claim doesn't hurt you five times as much as a $10,000 claim — the excess portion is partially buffered.

Improving your EMR requires a sustained, systematic approach to workplace safety and claims management. The most effective strategies include:

1. Implement a formal safety program. OSHA-compliant safety programs, regular toolbox talks, and documented safety training reduce injury frequency. Carriers and NCCI look favorably on businesses with documented safety cultures, and some carriers offer premium credits for certified safety programs.

2. Return-to-work programs. When an employee is injured, getting them back to work in a modified-duty capacity as quickly as possible reduces the total cost of the claim. Lost-time claims are significantly more expensive than medical-only claims, and reducing lost time directly improves your EMR.

3. Manage claims aggressively. Report claims immediately, work closely with your insurer's claims adjuster, and monitor open claims regularly. Reserves that are set too high inflate your EMR even before a claim is paid. An experienced agent can help you advocate for appropriate reserve levels.

4. Dispute questionable claims. Not every claim that is filed is legitimate. Work with your insurer to investigate suspicious claims and contest those that lack merit. Successful claim denials or reductions directly improve your loss history.

Your business becomes eligible for experience rating (and thus an EMR) once you have accumulated enough payroll to generate a minimum premium threshold — typically around $5,000–$10,000 in annual premium over two or more years. New businesses start with an EMR of 1.0 by default.

Once you become experience-rated, your EMR is recalculated annually by NCCI and takes effect at your policy renewal. You should receive a copy of your EMR worksheet from your insurer or agent before each renewal. Review it carefully — errors in the underlying data (wrong payroll figures, incorrectly attributed claims) do occur and can be corrected through a formal dispute process.

Beyond its direct effect on your premium, your EMR has significant business development implications. Many general contractors, municipalities, and large commercial clients require subcontractors to have an EMR below a certain threshold — commonly 1.0 or 0.95 — as a condition of bidding on projects.

A high EMR can disqualify you from lucrative contracts entirely, regardless of your price or qualifications. Conversely, a low EMR is a competitive differentiator that signals to potential clients that your company operates safely and professionally. In competitive bid environments, a strong EMR can be the deciding factor.