What an experience modifier actually costs you
I'll start with a question. What is your experience modifier?
If you don't know the number off the top of your head, you're paying too much for workers compensation. Probably not by a little. By 10% to 30%, year after year, until you do something about it.
Here's what the e-mod actually is, why it matters more than the rate, and the three things that move it.
The mod is the multiplier the rate doesn't tell you
Workers comp premium is calculated like this:
(Rate per $100 of payroll) x (Payroll, in hundreds) x (Experience Modifier) = Annual Premium
Carriers love to talk about the rate. "We can save you 8% on your rate." Great. The rate is set by your industry classification code and the state. There's some negotiation room, but it's a narrow conversation.
The mod is the part that's specific to YOU. It compares your business's claim history over the last three years against the average for businesses with the same class codes. A 1.00 mod means you're average. Below 1.00 means better than average. Above 1.00 means worse.
A 0.85 mod knocks 15% off your premium. A 1.30 mod adds 30%. On a $40,000 annual workers comp premium, the swing between those two is $18,000 a year. Every year. For three years rolling.
This is the most expensive number in your business that nobody talks about.
What actually moves the mod
Three things drive the e-mod, and they don't drive it equally.
Frequency hurts more than severity. This is the one that surprises business owners. One $150,000 claim usually hurts your mod LESS than five $30,000 claims, because the formula caps the impact of any single severe claim. A pattern of small claims signals a workplace pattern. The carrier rates that.
That means a $4,000 ER visit for a stitched cut, a $7,000 strain claim that resolved in two weeks, and a $12,000 claim with three weeks of light duty all matter. Individually small. Collectively, they're rebuilding your mod for the next three years.
Open claims hurt more than closed ones. A claim that's still open at the time the mod is calculated is rated at the reserved amount, which is usually higher than what eventually gets paid. Pushing a stale claim to closure (even if it means settling) is one of the fastest ways to bring the mod down.
Light duty matters more than safety posters. Returning an injured employee to a modified-duty role within a couple of weeks limits the indemnity portion of the claim, which is the part the formula cares about most. Carriers reward businesses with documented return-to-work programs because the data shows it works.
What clients tell me about safety programs
Most small-business owners think safety is about preventing accidents. It is, partly. But the e-mod doesn't care about prevention. It cares about claim COST.
A workplace where minor injuries get reported, treated quickly, returned to light duty, and closed inside 60 days has a dramatically lower mod than a workplace with the same actual injury rate where claims drag for months because there's no return-to-work plan and no panel of providers.
That's what insurance economics looks like. Not fewer accidents. Faster, smaller, closed claims.
What you can do tomorrow
Three things, in order.
One. Pull your most recent rate sheet from your current carrier and find your mod. It's listed on the policy, usually on the second or third page. If you can't find it, your current agent can email it within an hour. If they can't, that's a separate conversation.
Two. Ask the carrier for your loss runs for the last three years. This shows every claim, the reserves, the paid amounts, and whether it's open or closed. If you have open claims older than 90 days, push them to closure.
Three. Establish a written return-to-work program. Even a one-page document showing modified-duty roles available for common injuries earns you carrier credit. Many states also have premium credits for documented drug-free workplace programs.
The hardest part
A bad mod is sticky. Once it's elevated, it stays elevated for three years before it rolls off the calculation. The work you do today won't show up in your premium until next year's mod publishes.
That makes the math harder, not easier. If you have a 1.20 mod on a $50,000 premium, that's $10,000 a year above what an average business would pay. Three years of that is $30,000. The work to bring it down starts today, and the savings come next year and the year after that.
But the alternative is paying the elevated number forever, because by the time the bad years roll off, the new bad years are right behind them.
Send me your loss runs
If you're a current workers comp client, we already have your loss runs and we walk through them at every renewal. If you're not, send the loss runs over. We'll tell you specifically what's driving the mod, what to push to closure, and what kind of mod you could realistically be at in 24 months.