Definition:Retention ratio
📊 Retention ratio in the insurance context most commonly measures the proportion of premium or policies that an insurer keeps — whether that means the share of gross written premium retained after ceding to reinsurers, or the percentage of policyholders who renew their coverage. Both interpretations are widely used, and the intended meaning usually depends on whether the discussion centers on underwriting strategy and capital management or on distribution performance and customer loyalty.
🔍 On the reinsurance side, the retention ratio is calculated by dividing net written premium by gross written premium. A ratio of 80 percent, for instance, means the insurer cedes 20 percent of its premium volume to reinsurers and retains the rest. Analysts at rating agencies and investment firms use this metric to gauge how much risk an insurer is shouldering directly. When used in its customer-retention sense, the ratio is computed by dividing the number of renewed policies by the number of policies eligible for renewal, offering a straightforward snapshot of book-of-business stability across an agency or carrier.
📈 Regardless of which definition applies, a deteriorating retention ratio warrants attention. A declining premium retention ratio may signal that an insurer is purchasing more reinsurance — perhaps in response to worsening loss experience or tightening capital requirements — which compresses net margins. A falling policy retention ratio points to competitive pressure, pricing issues, or claims service shortcomings that are driving customers away. In either case, tracking the trend over time reveals far more than any single snapshot, giving leadership actionable insight into the health of the combined ratio and the durability of revenue streams.
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