Workers Comp Rate Filing: The Average Isn't Your Premium
Massachusetts regulators ordered a 14.6% workers' comp cut, then a court told them to show their math. A statewide average still isn't what any single contractor pays.
A workers comp rate filing sets average loss costs across a state, not any employer's premium. Massachusetts regulators ordered a 14.6% cut effective July 2024 (Insurance Journal, July 2026), yet a contractor's actual renewal turns on class mix, the carrier's loss-cost multiplier, schedule credits, and the experience mod. The headline percentage is the starting line, not the bill.
The 14.6% made every trade-association email in Massachusetts. It's the one number nobody actually paid. A workers comp rate filing is a statewide average, not an invoice, and this one drew a two-year fight to prove it.
In December 2023, the Workers' Compensation Rating and Inspection Bureau of Massachusetts (WCRIB) filed for a 7.6% rate decrease. The state's Attorney General wanted 17.5%. The acting commissioner split the difference with neither and ordered 14.6%, effective July 1, 2024 (Insurance Journal, July 2026). This month, the state's highest court sent the number back, ruling the regulator never showed how he got there.
Why a workers comp rate filing is an average, not a bill
A rate filing sets loss costs, the pure claim-cost piece of premium, averaged across every classification and every insured in the state. It's a starting point for carriers, not a quote for you. Massachusetts hasn't raised rates since 2016 (Insurance Journal, July 2026), and each cut since has been a statewide blend.
Your invoice is built from that blend, then bent four ways. The carrier multiplies the filed loss cost by its own loss-cost multiplier (LCM), which folds in overhead, commissions, and profit and can run from under 1.00 on clean accounts to well above 1.40. Your class mix decides which loss costs even apply. Schedule credits or debits, carrier discretion of roughly plus or minus 25%, move it again. Then your experience modification rate (EMR, the mod) multiplies the whole thing.
Change the statewide average and you've moved one input. The other four don't care what the headline says.
Two contractors, one rate cut
Picture two Massachusetts framing contractors on the same class codes, both handed the same 14.6% loss-cost cut. After the cut, each carries an identical manual premium of $100,000.
One runs a 0.95 mod. The other sits at 1.25. The first pays $95,000 modified. The second pays $125,000. Same trade, same reduced loss costs, same state cut, and a $30,000 gap on a single renewal. The 14.6% touched both accounts equally. The mod is what separated them.
That's the trap in a statewide headline. A CFO reads "rates down 14.6%" and budgets a lower renewal, then the invoice lands flat or higher because payroll grew into a costlier class code, the carrier nudged its LCM, or a claim aged onto the mod worksheet. The average fell. The bill didn't.
Why the court remand should make you read your own worksheet
The Supreme Judicial Court didn't say 14.6% was wrong. It said the commissioner "cannot simply order a percentage decrease without more." Justice Scott L. Kafker put it plainly: "you need to show your work. That is true for the commissioner's calculations as well" (Insurance Journal, July 2026). The 2024 cut saved employers about $87 million, and a denied 7.1% increase in 2025 held back roughly $80 million more (Insurance Journal, July 2026). Big numbers, all at the statewide level.
The lesson for a contractor isn't Massachusetts procedure. It's that every layer between a filed rate and a paid premium has to show its work too, and most layers never get audited. The commissioner's method also changed how public housing employees (class code 9033) get rated. Your worksheet has its own class assignments, its own reserves, its own mod, and any one of them can carry a number that no longer reflects reality.
What an audit would check
An audit doesn't argue with the state's rate filing. It checks whether the inputs stacked on top of it are accurate for your business: that payroll sits in the class codes that match the work performed, that the claim values feeding your mod match the carrier's current records, and that reserves inside your experience period haven't drifted from what the claims are actually worth. A statewide cut you can't verify at the account level is just a number on a press release. Whether it reaches your renewal depends on the four inputs underneath it.
A statewide rate cut lowers the shelf price. Your mod decides what you pay at the register. Send us your NCCI worksheet and we'll review it for free before your next renewal.