Deviation is underwriting language for manual-rate adjustments that shift premium up or down because the risk does not fit standard criteria.
Insurers define process controls, underwriting authority, and documentation standards to prevent discriminatory or inconsistent deviation practices.
Claims and pricing impact
Rate deviations can create adverse selection risk if not consistently controlled; aggressive discounts may lead to high loss ratios in renewal cycles, while overly high rates can increase lapse risk.
Example
Two identical policies with the same limits can carry different rates if one has additional protective devices and one has recent loss concentration in flood zones.