Definition:Net written premium
💰 Net written premium represents the total premium an insurance carrier records for policies written during a specific period, minus the premium ceded to reinsurers under all applicable reinsurance agreements. It sits between gross written premium — the full amount before any cessions — and net earned premium, which further adjusts for the timing of coverage delivery. Net written premium captures what the insurer has committed to retain on a written basis, making it a key indicator of the company's appetite for risk and its reliance on reinsurance.
📐 To arrive at the figure, an insurer starts with gross written premium and subtracts all outward cessions: treaty and facultative placements, quota share percentages, and any premiums paid for excess-of-loss protection. If the company also assumes premium inward from other carriers through assumed reinsurance, that amount is added back in. The resulting net written premium reflects the insurer's retained book of business on a written-date basis, regardless of how much of that premium has been earned through the passage of time. Because the calculation hinges on reinsurance structure, a single change in treaty terms at renewal can shift net written premium significantly from one period to the next.
📉 Tracking net written premium over time reveals important trends about an insurer's growth strategy and risk posture. A rising gross-to-net ratio — meaning a larger share of premium is being retained — may signal confidence in underwriting profitability or reflect tighter reinsurance markets that make ceding more costly. Conversely, a shrinking net written premium relative to gross can indicate a deliberate strategy to reduce net retention amid catastrophe risk concerns. Rating agencies and financial analysts compare net written premium to policyholder surplus through the net premium-to-surplus ratio, a leverage metric that gauges whether the carrier has adequate capital backing its retained obligations.
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