Experience Mod Estimator

What Is an Experience Modification Rate?

Your experience modification rate (EMR or "mod") is a multiplier applied to your base workers' compensation premium. It is calculated annually by NCCI (the National Council on Compensation Insurance) based on your company's actual claims history compared to what would be expected for a company of your size and industry. A mod of 1.00 means you are exactly average — you pay the standard filed rate. A mod of 0.85 means you pay 15% less than the standard rate. A mod of 1.30 means you pay 30% more.

The mod is not a penalty or a reward in isolation — it is a statistical comparison. NCCI compares your actual losses over the past three years (excluding the most recent year) to the "expected losses" for a business of your payroll size and classification. If you have had fewer or smaller claims than expected, your mod goes below 1.0. If you have had more or larger claims than expected, it goes above 1.0.

For Florida contractors, the mod has an outsized effect because construction base rates are relatively high. A roofing company might pay $12/100 in base rate. With a 1.30 mod, that becomes effectively $15.60/100 — a 30% premium surcharge that compounds year after year if claims continue. Conversely, a roofing company that has invested in safety and kept claims down may earn a 0.80 mod, cutting their premium by 20%. The difference between a 0.80 and a 1.30 mod on a $500,000 payroll at a $12/100 rate is $30,000 per year in premium.

Mod Estimator Tool

Enter your information below to get an estimated mod range. This is an educational approximation — your actual NCCI-calculated mod uses a precise actuarial formula with primary/excess loss splits, ballast factors, and three years of detailed claims data. Use this tool to understand roughly where you stand and what factors are driving your mod.

What Drives Your Mod Up or Down

The NCCI experience mod formula weighs two things: how many claims you have and how large each claim is. Within the formula, claim dollars are split into "primary" losses (typically the first $17,000 of each claim) and "excess" losses (everything above that threshold). Primary losses are given full weight in the mod calculation because they are the most predictable indicator of your company's claims frequency. Excess losses — the tail of very large claims — are given partial weight because large individual claims have more statistical noise and say less about your routine safety performance.

What this means practically: claim frequency matters more than claim severity in the mod formula. Five $5,000 claims hurt your mod more than one $25,000 claim, because each small claim carries full primary loss weight. A company with many small claims — slips and falls, minor cuts, first-aid cases that turn into reportable claims — often has a worse mod than a company that had one serious injury but otherwise has clean years.

The flip side is that very large claims — six-figure losses from serious injuries — can still significantly damage your mod even though they are weighted less heavily. A single catastrophic claim on a small-payroll company can push the mod above 1.50 and take years to work down. This is why medical management and return-to-work programs matter most when a serious injury does occur.

The Relationship Between Mod and Premium

Your workers' comp premium = (payroll ÷ 100) × class code rate × experience mod. Every point of mod reduction reduces your premium by the same percentage. If your annual premium is $40,000 and you reduce your mod from 1.20 to 1.00, your premium drops to approximately $33,333 — a savings of $6,667 per year, every year going forward until your claims history changes again.

This is why carriers, brokers, and employers all pay close attention to mod management. A 0.20 mod reduction on a $40,000 premium is a permanent $6,667 annual savings — better than most other cost reductions available to a contractor. A good safety program that costs $2,000/year in training and equipment but prevents two $8,000 claims per year pays back not just the claim costs, but the compounding mod savings over three years.

Frequently Asked Questions — Experience Mod

Related Resources

• What is an experience mod — in-depth explanation
• Workers' comp payroll estimator — estimate your annual premium
• Florida workers' comp rate history
• PEO vs. standard policy — how group rating helps high-mod employers
• Get an instant quote that accounts for your mod