Insurance Rating Engine

What is an Insurance Rating Engine?

An insurance rating engine is the software component that calculates premium for an insurance policy. It is one of the most complex and most heavily regulated parts of any policy administration system. Given an applicant's information — exposure data, risk characteristics, coverage selections, limits, deductibles, prior loss history — the rating engine applies the carrier's filed rates (in admitted markets) or pricing models (in non-admitted markets) and produces the premium the customer will be charged.

Modern rating engines handle hundreds or thousands of rating variables. For a commercial auto policy, the rating engine considers vehicle classifications, garaging territories, radius of operations, driver assignments, prior loss history, classification codes, applicable surcharges and credits, multi-policy discounts, and dozens of other factors. The complexity is real — and the regulatory consequences of getting it wrong are significant.

Rating Engine Capabilities

A modern insurance rating engine typically includes:

Rate table management: Storage and version control of filed rate tables, with effective-date logic for rate changes. Rate tables specify base rates by class, territory, and coverage.

Schedule rating: Application of credits and debits within filed schedule rating ranges. Underwriter discretion is bounded by filed maximums for credits and debits, and each schedule rating decision must be documented for regulatory review.

Experience modification: For workers compensation and some commercial lines, application of experience modification factors from rating bureaus (NCCI, state-specific bureaus) that reflect the insured's actual loss experience relative to expected.

Surcharges, discounts, and packages: Multi-policy discounts, loyalty credits, claims-free credits, safety discounts, and package discounts that adjust the base rate. Each must be filed in admitted markets and applied per filed rules.

Tax and stamping calculations: Application of premium tax, surplus lines tax, stamping office fees, and policy fees per the applicable jurisdiction. For surplus lines business, the rating engine applies state-specific surplus lines tax rates and tracks stamping office requirements.

Filed vs Non-Filed Rates

Insurance rating engines operate in two distinct regulatory environments. In admitted markets — most US personal lines and a significant portion of US commercial lines — rates must be filed with and approved by state insurance regulators before they can be charged. The rating engine must apply only filed rates, and any deviation requires a re-filing.

In non-admitted markets — surplus lines, London market subscription business — rates do not require state filing. The rating engine supports flexible pricing including manual underwriter overrides. For MGAs operating in surplus lines, the rating engine flexibility is a significant operational advantage compared to admitted-market constraints.

Rating Engine vs Rules Engine vs Workflow Engine

Three terms that sound similar but cover meaningfully different capabilities:

Rating engine calculates premium from filed rates and exposure data.

Rules engine evaluates business rules — is this risk within appetite, does this claim qualify for auto-approval, does this transaction trigger SIU referral. See workflow and rules engine for detail.

Workflow engine orchestrates the stages of a process — submission to bind, FNOL to settlement, application to issuance.

Rating engines are typically embedded in the policy administration system. Rules engines and workflow engines can be embedded in the PAS or layered separately. Regure's approach layers workflow and rules on top of the carrier's rating engine, leaving the premium math where it belongs while modernising the operational layer around it.