PEO master policy versus guaranteed cost: why a client's mod does not price a master policy

Here's a mistake we see in program comparisons from brokers who should know better: a client with a 1.40 mod gets a PEO master-policy quote, and the comparison spreadsheet applies the 1.40 to the master-policy number — or celebrates that the PEO option "removes the mod" as if the loss history evaporated. Both versions misunderstand what a master policy is, and both produce comparisons that fall apart in year two. This post is the mechanics, from our own underwriting practice.

Two different things being priced

Guaranteed cost prices the client: bureau rates for the client's class codes, times payroll, times the client's own experience mod, adjusted by schedule rating. The client's claims history follows the client, through the mod, for the three-year rating window.

A PEO master policy prices the PEO's program. The carrier underwrites the PEO: its book of clients, its risk selection, its safety and claims practices, its aggregate loss experience. Client employees are covered under the PEO's policy, and the individual client's filed experience mod is not what the carrier applies — the client is priced as an entrant into the PEO's program, on the program's terms.

This is why applying a client mod to a master-policy quote is a modeling error, not a simplification. In our own pricing engine it's structurally prevented: a master-policy option cannot carry a client mod field at all.

How the client's history enters anyway

"The mod doesn't apply" never means "the history doesn't matter." A PEO underwriting a prospective client reads the same loss runs a carrier would — and prices the admission. In programs we work with, that commonly takes forms like a fade factor (a program-level adjustment that moves the client's cost toward program norms rather than applying the filed mod directly) and, in loss-sensitive program designs, a loss fund — a share of premium set aside against the client's own expected claims. Terms like these vary by PEO and carrier, which is exactly the point: they are negotiated program economics, not bureau-filed formulas, and a broker comparing options has to read the actual program terms rather than assume guaranteed-cost mechanics.

Who the trade actually favors

The 1.40-mod client often finds the master policy cheaper now: the program admits them at better-than-mod economics because the PEO believes its safety and claims management will bend the client's losses toward program norms. The honest caveats: the discount is the PEO's underwriting bet, it gets re-examined at every program renewal, and the client's claims inside the program are being watched — admission pricing is not permanent pricing.

The 0.85-mod client faces the mirror-image question: a master policy prices them as a program entrant, which can mean giving up some of the pricing their own good experience earned. For this client, guaranteed cost lets the 0.85 do its work directly. The master policy has to win on the rest of the PEO value proposition — payroll, HR, benefits, compliance — not on workers' comp arithmetic.

Every client should ask the exit question before entering: what happens to experience rating when they leave? Whether and how experience from the PEO period follows the client into standalone rating varies by state and bureau rule, and the answer determines whether a future exit lands at a fresh start, a reconstructed history, or a no-experience penalty rate. A broker who can't answer it for the client's state hasn't finished the comparison.

The comparison done honestly

A program comparison that lets a client actually decide shows, side by side:

1. Guaranteed cost at the client's real projected mod — projected, not expiring, since the mod can be known early
2. The master policy at the program's actual quoted terms — with no client mod applied anywhere
3. For any loss-sensitive structure: the expected cost, the collateral or fund commitment, and the downside if losses run over the pick — never the expected number alone
4. The exit scenario under the client's state rules

Rule 3 deserves its sentence: presenting a loss-sensitive option's expected cost without its downside and its locked-up collateral is how brokers lose those accounts in year two, when the downside shows up uninvited.

HALO IQ's program comparator models all four structures side by side — and it will not render a master-policy option with a client mod attached or a deductible option without its downside. The guardrails are the product. See a comparison on a real account.

Program structures described here are common designs from our underwriting practice; specific terms are set by each PEO and carrier. State rules on experience data in and after a PEO relationship vary — verify your state's.