When I set up workers comp for a new business, the mod is usually the first thing I explain — not because they have a bad one. Every new business starts at 1.0. I explain it because most business owners don't know it exists until renewal, when they find out it's been moving without them. A 1.0 can become a 1.4 after two rough claims years, and once you're there, the conversation with carriers gets harder fast.
Here's how the mod works, what moves it, and what you can actually do to keep it from working against you.
What the Experience Mod Actually Is
Your experience modification factor — also called an experience mod or EMR — is a multiplier applied to your workers comp premium. It's calculated by the Minnesota Workers Compensation Insurers Association (MWCIA), which is the state rating bureau that processes mod calculations for all eligible employers in Minnesota.
The calculation compares your actual workers comp losses to the losses that would be statistically expected for a business of your size and industry class. The result is a ratio:
- 1.0 — Your losses match what's expected. Neutral. No surcharge, no credit.
- Above 1.0 — Your losses have been worse than average. Your premium is multiplied up. A 1.25 mod means you're paying 25% more than the base rate.
- Below 1.0 — Your losses have been better than average. You receive a credit. A 0.85 mod means you're paying 15% less than the base rate.
For most small businesses, the difference between a 0.85 mod and a 1.25 mod translates to thousands of dollars per year in premium — and the gap compounds at renewal if the underlying claim situation doesn't change.
How the Calculation Works — and Why Frequency Matters More Than Severity
The mod is based on a three-year experience period — your three most recently completed policy years, excluding the current year. MWCIA publishes your updated mod once per year, and it follows you to every carrier you quote.
The part most business owners don't know: claim frequency is weighted more heavily than claim severity. Three small claims of $5,000 each will damage your mod more than one large claim of $15,000. The formula is designed this way intentionally — frequency is considered a better indicator of your safety culture than the size of any single incident.
What I tell every new business: Your mod starts at 1.0. The goal isn't to get it lower immediately — the goal is to understand that one bad claim can spike it for three years, and three bad claims can make you very difficult to place in the standard market. Frequency is the thing to manage.
When Does Your Business Qualify for a Mod?
Not every business has an experience mod. In Minnesota, you typically become eligible once you're generating roughly $5,000 or more in annual workers comp premium — enough for the calculation to be statistically credible. Most businesses hit that threshold within two to three years of operation.
New businesses start at a 1.0 neutral mod. MWCIA calculates and issues your first mod once you cross the eligibility threshold. After that, it's recalculated annually at each policy renewal.
What Moves Your Mod — and What You Can Do About It
What pushes it higher
- Any workers comp claim — multiple claims in the same year hurt the most
- Claims that stay open for a long time with ongoing medical costs
- Claims with significant indemnity (wage replacement) payments
- Misclassified employees who should be in a higher-risk class code
What brings it down — or keeps it down
- Safety programs. Documented safety training, regular job site inspections, proper PPE — carriers notice these and some will credit them directly.
- Return-to-work programs. Getting an injured employee back to light duty quickly reduces indemnity costs significantly. A claim that costs $8,000 in medical with no lost time damages your mod far less than the same injury with six weeks of wage replacement.
- Claims management. Work with your agent to make sure claims are properly reserved. Reserves set too high can inflate your mod even if the claim ultimately closes for less. If a claim's reserve seems disproportionate, that's worth a conversation with your carrier.
- Time. Claims roll out of your experience period after three years. If you've had a rough period and addressed the underlying issues, staying claims-free long enough to let bad claims age out is genuinely effective.
Why Your Mod Follows You to Every Carrier
A question I get from business owners who've had a bad mod year: "Can I just switch carriers and start over?" No. The mod is filed with MWCIA and is public information that every admitted workers comp carrier in Minnesota can see. When you get a new quote, the carrier looks up your MWCIA mod and applies it to their base rate. You can't leave a bad mod behind by changing insurers — you can only improve it over time.
What you can do is work with an independent agent who knows which carriers look harder at claim type versus claim history, and who can help you document what you've actually done about the underlying issue. There's a real difference between carriers on this. Some will give real credit for a documented safety program and a clean recent record. Others won't. That's worth knowing before you start shopping.
Tom Wertish
President & AgentTom founded Options Insurance in 2014 and works with contractors, manufacturers, and service businesses across Minnesota on workers comp, experience mod management, and commercial insurance. If you're setting up workers comp for the first time or trying to understand why your mod moved at renewal, this is a good conversation to have before you're shopping at renewal under pressure.
Workers comp is one piece of your commercial insurance program. Our workers comp page covers how we shop it.
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