Contractors find out about their experience mod in the worst possible way: a general contractor or project owner rejects their bid, or a prequalification portal flags them, and they call their agent asking why their "EMR" is so high and how fast it can come down. The conversation that follows can build the relationship or damage it. If you explain the number clearly, check it for errors, and set honest expectations about timing, you become the person the contractor relies on. If you guess, promise a quick fix, or blame the carrier, you set yourself up for a harder call next year.
This guide is for agents and account managers with contractor clients. It covers why owners care about the mod, how to read the worksheet with the client, how to explain frequency versus severity, what the client can work on over time, what not to promise, and how to check the data.
To a contractor, the experience modification rate (EMR, or mod) has two separate effects.
It changes their premium. A mod above 1.00 is a debit that increases the workers' comp manual premium; below 1.00 is a credit that reduces it. For a contractor with high-rated classes, that difference is real money.
It is used as a safety screen. Many general contractors, project owners and public agencies ask for the mod during prequalification, alongside items such as OSHA injury and illness records and safety program documents. Some set a maximum mod or score the mod as one factor among several. The thresholds are the owner's choice, not a regulatory standard, and they differ from project to project. Before you discuss "how high is too high," get the actual bid or prequalification requirement from the client. The number in that document is the one that matters.
That second use is why construction clients feel the mod so personally. A debit mod can cost them work, not just premium, and the pressure to "fix it fast" is intense. Your job is to help them understand what the number reflects and what can and cannot change it.
Ask for the current experience rating worksheet from the carrier or the rating organization. In NCCI states, the worksheet is produced by NCCI and available through its Riskworkstation portal; in states with their own rating bureaus (for example California, Pennsylvania, New Jersey, Delaware and Michigan, which do not use NCCI's plan), the bureau produces its own form. Sit down with the client and go through it together.
Confirm the legal entity name, risk ID, states, rating effective date and the status. If the mod is contingent, the rating organization is still waiting on audited payroll or loss data from a carrier; if preliminary, a state's new rating values are not yet final. Either way, the number can still move.
Under NCCI's plan, the experience period is generally three policy years ending about a year before the rating effective date. A policy is included if it started between 57 and 21 months before that date. Show the client which years are on the sheet. Many contractors assume last year is the problem; often the claims driving the mod are two or three years old.
For each policy year, the worksheet lists individual claims above a small threshold, with injury type, open or closed status, and incurred amount (paid plus reserved). Smaller claims may be grouped by injury type. Walk through every listed claim with the client and ask:
The summary compares actual primary losses to expected primary losses, and actual excess to expected excess. Expected losses come from payroll and class codes; actual losses come from the claims. The comparison tells you where the debit comes from.
This is the conversation that changes how a contractor thinks about the mod.
Each claim on the worksheet is split at a split point, which is set state by state in NCCI states and shown on the worksheet. The part of each claim up to the split point is primary loss; the part above is excess. Primary losses count in full. Excess losses count only partially, with more weight for larger employers. Each state also caps any single claim at a per-claim limitation for rating purposes.
The plain-language version for the client:
"The formula cares more about how many people got hurt than about how expensive any one injury was. Ten small claims put ten full chunks into the part of the formula that counts the most. One big claim puts in one chunk, and the rest is discounted."
NCCI makes the same point with its own example: two similar employers, one with a single $50,000 loss and one with ten losses totaling $50,000. The ten-claim employer gets the much higher mod, because frequency is the better predictor of future losses.
Two follow-ups for the client:
In most NCCI states, the Experience Rating Adjustment (ERA) counts only 30% of each medical-only claim's primary and excess amounts. That is a 70% reduction compared with a lost-time claim of the same size. Confirm ERA applies in the client's state. The point for the client: an injury that stays medical-only, because the worker gets appropriate care and returns to work promptly, is treated much more lightly than one that turns into weeks of lost time. And because ERA was designed to reduce the incentive to keep small claims off the books, paying them out of pocket offers less rating benefit than many contractors think, alongside the obvious coverage and compliance risks.
There are three operational areas where a contractor's own practices shape the losses that feed future mods. Present them as long-term practices, not mod fixes.
Safety and supervision. Frequency comes from how work is done: fall protection, ladder and scaffold practices, material handling, tool use, housekeeping, and whether foremen enforce the rules. The carrier's loss-control staff and OSHA's free On-Site Consultation Program for small businesses are both resources to suggest.
Prompt injury reporting. When injuries are reported quickly, the adjuster can direct care and manage the claim early. Delays make that harder. A simple written procedure for reporting injuries to the office and the carrier the same day is a reasonable baseline.
Modified duty and return to work. On a construction site, light duty is harder to find than in an office, but it exists: flagging, tool crib, material staging, site cleanup within restrictions, safety documentation, estimating support, training. A worker earning wages on modified duty generally draws less wage-loss benefit than one at home. Modified duty has to be coordinated with the treating provider's restrictions and, where they apply, with FMLA and ADA obligations. Under the FMLA regulations, an employee on FMLA leave may turn down light duty and keep job-restoration rights, though they may lose workers' comp wage benefits (29 CFR 825.220(d), 825.702(d)(2)).
For more on following claims through to closure, see ABTC's guide on tracking and managing workers' comp claims. If the client's office manager or safety coordinator handles injuries and adjuster contact, the Workers' Compensation Training & Certification program is built for that role.
This is where agents get into trouble. Avoid these:
What you can say: how the formula works, which claims are driving the current number, which policy year leaves the calculation next, what data you are checking, and what the client's own practices can influence over time.
A high mod is sometimes a data problem. Checking the data is the most concrete thing you can do for the client right now.
Compare the payroll on each worksheet line to the final audit for that policy year. Look for:
Expected losses are driven by class. If clerical or sales payroll ended up in a construction class, or if work was coded to the wrong construction class, expected losses on the worksheet are off, and the mod comparison is off with them. Construction classification is detailed and state rules on dividing payroll between classes vary, so involve the carrier's audit or underwriting staff.
Under NCCI's rules, an issued mod can be revised only in limited circumstances, such as correction of a reporting error, a claim found non-compensable, a subrogation recovery reported by the carrier, or an ownership change. Ask the carrier to correct its unit report where you find an error; the rating organization then revises the worksheet. Disputes over a reserve's adequacy are a matter for the carrier's claim staff.
Contractors often form new entities for new projects or partners. Under NCCI's rules, the experience of entities with more than 50% common majority ownership is combined into one mod, and ownership changes must be reported in writing within 90 days on the ERM-14 form or equivalent. A new LLC does not automatically start at 1.00.
For a structured course on these mechanics, see ABTC's experience mod course and the broader workers' compensation training catalog.
Contractors rarely have a full-time HR or risk department; the person reporting injuries and talking with adjusters is often an office manager or a project administrator. The Workers' Compensation Training & Certification program teaches injury reporting, the claims process, medical restrictions and return to work, safety and injury prevention, and how premiums are determined, with an optional Certified Workers' Compensation Administrator exam. It is professional training, not state insurance CE, and it is a practical resource to recommend to clients who want their team to handle these steps consistently.
A mod of 1.00 means losses were in line with expectations for the contractor's classes and size; below 1.00 is a credit and above is a debit. For bidding, "good" is whatever the owner or general contractor requires, and those prequalification thresholds vary by project and are not set by regulation. Read the bid documents for the exact requirement, and if a single claim is driving a debit, see whether the questionnaire allows an explanation.
Usually because actual primary losses exceed expected primary losses, which points to claim frequency. Sometimes it is one large open claim, or a data problem: payroll in the wrong class, estimated payroll never replaced by audit, a duplicate or misattributed claim, or experience combined from a related entity. Go through the worksheet claim by claim and line by line before drawing a conclusion.
Under NCCI's plan, the experience period generally covers three policy years ending about a year before the rating effective date. A claim from a given policy year typically appears in three consecutive mods, starting roughly two years after that policy began. Check the dates on the actual worksheet, since short-term policies or changed effective dates can shift what fits in the period. Independent bureau states have their own rules.
Not through operations alone, because the mod looks back at policy years that are already over. What can change the current number is correcting errors: payroll, class codes, claim data, or ownership combinations. Over time, fewer injuries and prompt return to work affect the losses that feed future mods. Agents should explain the timing and avoid promising any specific result or date.
They can affect a future mod. Carriers report claim values to the rating organization at set intervals, starting 18 months after the policy began. A reserve that comes down after a valuation date generally shows up when the next report is filed and a new mod is calculated, rather than revising the current mod. Revisions to an issued mod are limited to circumstances such as errors, non-compensable findings, subrogation recoveries and ownership changes.
It is risky and often less helpful than expected. In most NCCI states, the Experience Rating Adjustment counts only 30% of a medical-only claim, so small medical claims already have reduced weight. Unreported injuries can create coverage problems if the injury worsens, and they can conflict with state reporting rules and the policy's notice requirements. The client should discuss any such practice with the carrier and counsel first.
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