What Actually Goes Into a Workers' Comp Manual Rate: Loss Cost × LCM, Explained

Ask three people in a PEO sales office what the "rate" on class code 5645 is and you will get three answers, all of them partially right. One will quote the NCCI loss cost. One will quote what the PEO's carrier charges. One will quote what a competitor's proposal showed last month. The confusion is not carelessness. It comes from the fact that a workers' comp manual rate is built in two layers by two different parties, and most people only ever see one layer at a time.

This post lays out both layers, how they combine, and why the combination differs by carrier, by state, and sometimes by program within the same carrier.

Layer one: the advisory loss cost

In most states, the National Council on Compensation Insurance publishes advisory loss costs by classification code. A loss cost is an estimate of the pure cost of claims per $100 of payroll for that class: medical, indemnity, and in NCCI's filings, loss adjustment expense. It is built from the pooled experience of every carrier reporting in that state, developed and trended to the period the loss costs will be in effect.

What a loss cost does not include is anything about running an insurance company. No commissions, no underwriting salaries, no premium taxes, no profit margin, no contingency for the years the estimate turns out to be wrong. The Missouri Department of Insurance puts it plainly on its public loss cost multiplier page: the NCCI loss cost reflects the pure cost of claims and does not include everyday business costs like salaries, rent, and utilities.

Loss costs are filed with each state's insurance regulator and, once approved, become the common starting point for every carrier writing in that state. They are revised at least annually, and a given class code's loss cost can move substantially from one filing to the next as the underlying experience develops.

A handful of states use an independent rating bureau rather than NCCI. California is the one that matters most to us, and we will come back to it.

Layer two: the loss cost multiplier

A carrier cannot charge a loss cost. It has to cover its expenses and earn a return, and it does that by filing a loss cost multiplier, or LCM, with the state. The manual rate is simply:

Manual rate = advisory loss cost × carrier LCM

An LCM of 1.400 on a loss cost of 2.50 produces a manual rate of 3.50 per $100 of payroll. Missouri's loss cost multiplier page gives a clean illustration: two carriers starting from the same carpentry loss cost, one with an LCM of 1.250 and one with 1.500, land on manual rates roughly twenty percent apart before any experience modification or schedule credit is applied.

What is inside the LCM is the part worth understanding. Broadly, it carries the carrier's provision for commissions and other acquisition costs, general administrative expense, premium taxes and assessments, a profit and contingency load, and in some filings an adjustment for the carrier's own loss experience relative to the industry. Each carrier derives its own LCM from its own expense structure and appetite, which is why the state publishes a list of them rather than a single number.

That list is where the pricing conversation starts for a PEO or MGA. If you know every carrier's filed LCM in a state, you know every carrier's manual rate for every class code before anyone has quoted anything. The quote itself then becomes a question of mod, schedule rating, and deductible structure layered on top.

Why two carriers quote the same class code differently

Put the two layers together and the answer is obvious: the loss cost is shared, the LCM is not. But the LCM is only the first reason two quotes diverge, and often not the largest.

The second reason is tiering. Many carriers file more than one LCM. A carrier may have a preferred tier, a standard tier, and a substandard tier, each with its own multiplier, and assign an account to a tier based on underwriting criteria. Some carriers operate several affiliated insurance companies under one group, each with a different LCM, and place accounts across them. Some file program-specific multipliers for a PEO program, an association program, or a particular industry segment. When you see two quotes from what looks like the same carrier at different rates, you are usually looking at two tiers or two paper companies.

The third reason is deviation by class. A carrier may file a deviated LCM for specific classifications where it believes its own experience or appetite justifies a departure from its base multiplier. Missouri's published list notes that where a company has filed deviated LCMs for certain classes, the list shows an average rather than the base. The practical effect is that a carrier's "LCM" can be a range, not a number, and the right value depends on the class code in front of you.

The fourth reason is everything that happens after the manual rate: experience modification, schedule rating credits and debits, premium discount, deductible credits, and in some states, assessments that ride on top of premium. These are not part of the manual rate, but they are part of the quote, and a broker comparing two quotes line by line needs to separate them from the manual rate to understand where the difference is actually coming from.

California is a different system

California does not use NCCI. The Workers' Compensation Insurance Rating Bureau of California files advisory pure premium rates with the California Department of Insurance. The WCIRB's own explanation of the system is useful here: pure premium rates reflect expected benefit losses plus the cost of adjusting and settling claims, and do not account for administrative and other overhead costs. Insurers may use the advisory rates as a starting point and add factors for their own costs, or develop their own rate structure entirely. Once an insurer's rates are filed with the department, the insurer must use them on policies in effect during the applicable period.

The structure is conceptually the same as loss cost times LCM, but the vocabulary and the filing mechanics differ. California carriers file their own rates by classification rather than a multiplier applied to a bureau figure, and the Department of Insurance publishes a rate comparison by class code so the public can see what each carrier actually charges.

The advisory rate also moves. For policies effective September 1, 2025, the Insurance Commissioner adopted an average advisory pure premium rate of $1.52 per $100 of payroll, which the Department described as an 8.7 percent increase over the prior approved rate. That is an average across all classifications; individual class codes moved more or less. Because the advisory rate is advisory, carriers were free to adopt it, exceed it, or stay below it, and a PEO pricing California business cannot assume that any carrier's filed rates track the bureau's number.

For a PEO operating in both California and NCCI states, the operational consequence is that rate intelligence has to be built twice: one pipeline for NCCI loss costs and carrier LCMs, another for WCIRB pure premium rates and carrier-filed California rates. Mixing them up is a common error in spreadsheets that were built for one state and then stretched to cover another.

What this means for a PEO's own pricing

A PEO on a master policy typically pays its carrier a rate that is already a manual rate times whatever modifiers the carrier applies to the PEO's program. When the PEO prices a client, it is building a second multiplier of its own: the rate it charges the client over the rate it pays, which has to fund the loss fund, cover the PEO's claims administration and safety services, and leave margin.

Understanding the carrier's layer matters for two reasons. First, if the PEO knows the manual rate every carrier in the state would charge the client directly, it knows the ceiling on what the client will pay before walking away. Second, when a carrier reprices the PEO's program, the PEO needs to know whether the change came from the loss cost, the LCM, or the tier assignment, because each implies a different conversation.

Stale data is the quiet danger. A loss cost filing from two years ago combined with a current LCM produces a manual rate that no carrier is actually charging. Rate intelligence has to be tied to effective dates, and anything outside the current filing year should be flagged rather than used.

Where CarrierIQ fits

This is the problem CarrierIQ in HALO IQ was built to handle. It ingests carrier rate filings, maintains rate sheets by carrier and state, and computes manual rates from NCCI loss costs and carrier LCMs, with tiered multipliers tracked separately rather than averaged away. California is handled as its own system with WCIRB pure premium rates and carrier-filed rates, because treating it like an NCCI state produces wrong numbers.

The point is not to replace the carrier's quote. It is to know, before the quote arrives, what the quote should be, and to be able to explain to a broker or a prospect exactly which layer moved when it comes in different.