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Your workers' comp experience mod — the experience modification rate, or EMR — is one of the most important numbers in your Michigan business that you probably never see. It's a multiplier applied to your workers' compensation premium based on your claims history, and it can quietly raise your cost by 25% or drop it by 15% compared with an average business your size. Understanding how the EMR works is the first step to controlling it. Here's the plain-language version for Michigan employers.
The baseline is 1.00. An experience mod of 1.00 means your business has an average claims record for its industry and size. Below 1.00 is a credit — you pay less than average. Above 1.00 is a debit — you pay more. Everything you do around safety and claims is really about pushing that number below 1.00 and keeping it there.
What Is the Experience Modification Rate (EMR)?
The EMR compares your business's actual losses to the losses expected for a business of your type and size. If you have fewer or smaller claims than expected, your mod drops below 1.00 and your premium goes down. If you have more, it rises above 1.00 and your premium goes up. The formula, at its simplest, is:
(Payroll ÷ 100) × class-code rate × your experience mod = your premium.
That last term is the one you can influence most over time. A business paying $30,000 in base premium with a 0.85 mod pays $25,500; the same business with a 1.20 mod pays $36,000. Same work, same payroll — a difference of more than $10,000 driven entirely by claims history.
How Your Experience Mod Is Calculated in Michigan
Michigan is an independent rating-bureau state. Experience mods for Michigan employers are produced through the Compensation Advisory Organization of Michigan (CAOM), the state's licensed rating organization, using a standard experience-rating formula. A few mechanics are worth knowing:
Actual vs. expected losses
The bureau looks at roughly three years of your loss history (not the current year) and compares your actual losses to the expected losses for your class codes and payroll. Perform better than expected and you earn a credit; worse and you take a debit.
Primary vs. excess losses
Each claim is split into a primary portion (the first slice of the loss) and an excess portion (the rest). The formula weights the primary portion far more heavily — which has a big consequence explained below.
You have to be big enough to be rated
Only businesses above a minimum premium threshold are experience-rated at all. Smaller employers pay the manual (class-code) rate without a mod until their payroll and premium grow past that threshold.
What Your Mod Does to Your Premium
| Experience Mod | On a $30,000 base premium | What it signals |
|---|---|---|
| 0.85 | $25,500 | Better-than-average safety record |
| 1.00 | $30,000 | Average for your industry & size |
| 1.20 | $36,000 | Worse-than-average loss history |
Beyond the premium itself, many general contractors and municipalities in Michigan won't let a subcontractor bid if their EMR is above 1.00 — so a high mod can cost you jobs, not just dollars.
Why Frequency Hurts More Than Severity
Because the formula weights the primary portion of each loss so heavily, lots of small claims damage your mod more than one large claim. Three $5,000 injuries hurt your experience rating more than a single $15,000 injury, even though the dollar totals match. The takeaway for Michigan employers: preventing minor, frequent injuries — strains, slips, small lacerations — is where the biggest mod improvements come from. It's not only the catastrophic claims that drive your number.
How Long a Claim Affects Your Mod
A claim stays in your experience-rating window for about three years, then rolls off. That cuts both ways: a bad year follows you for three renewals, but a clean stretch also compounds in your favor as older losses drop out. This is why consistency matters — one good year helps, but a sustained safety record is what earns and holds a mod well below 1.00.
How to Lower Your Experience Mod in Michigan
- Prevent the frequent, small injuries. Because frequency drives the primary loss portion, a focused safety program targeting common minor injuries moves your mod the most.
- Use a return-to-work program. Bringing injured employees back on light duty reduces claim costs and lost-time severity — both feed into a lower mod.
- Report and manage claims fast. Prompt reporting and active claims management keep reserves accurate and stop small claims from ballooning.
- Verify your data. Errors on your mod worksheet — wrong payroll, misapplied class codes, or claims that should have closed — happen more often than owners realize. Have your agent audit the worksheet.
- Classify payroll correctly. Misclassified payroll inflates both your base premium and your expected losses; getting it right is foundational. See how workers' comp is priced in Michigan.
- Don't skip the year-end audit. Estimating payroll wrong distorts your premium and your rating data — here's what happens if you skip your workers' comp audit.
The Bottom Line
Your experience mod is a scorecard of how safely your business runs, and it multiplies straight into your premium — and sometimes into your ability to win work. The good news is that it's one of the most controllable numbers in your business: prevent frequent small injuries, bring people back on light duty, keep your data clean, and the mod trends down year after year. If you're not sure what your current mod is or whether it's even accurate, send us your mod worksheet and loss runs — we'll check it for errors and shop your workers' compensation across our Michigan carriers. Start with a free quote and we'll take it from there.
Frequently Asked Questions
What is a good experience mod (EMR) for a Michigan business?
Anything below 1.00 is better than average and earns a premium credit; 1.00 is exactly average for your industry and size. Many well-run businesses target 0.90 or lower, and some contracts require a mod under 1.00 to bid at all. Above 1.00 means you're paying a debit and there's room to improve through safety and claims management.
Who calculates the experience mod in Michigan?
Michigan is an independent rating-bureau state, so experience mods for Michigan employers are produced through the Compensation Advisory Organization of Michigan (CAOM), the state's licensed rating organization, using a standard experience-rating formula based on your payroll, class codes, and loss history. Your insurer and agent can pull and review your mod worksheet.
How long does a workers' comp claim affect my experience mod?
A claim generally stays in your experience-rating calculation for about three years before it rolls off. That means a costly year affects roughly three renewals, but a clean stretch also compounds in your favor as older losses drop out of the window. Sustained safety performance is what keeps a mod low over time.
Do small claims or big claims hurt my mod more?
Frequent small claims usually hurt more than a single large one. The experience-rating formula weights the primary (first) portion of each loss most heavily, so several minor injuries can damage your mod more than one severe claim of the same total dollar value. Preventing common minor injuries is often the highest-leverage way to improve your number.
Can my experience mod be wrong?
Yes, and it happens more than owners expect. Incorrect payroll figures, misapplied class codes, claims left open that should be closed, or reserves set too high can all inflate your mod. Having your agent audit the mod worksheet each year is worthwhile — correcting an error can lower your premium without changing anything about your operations.