Definition:Written to earned ratio
📋 Written to earned ratio is a metric that compares an insurer's written premium to its earned premium over a given period, expressed as a ratio or percentage. In the insurance industry, this figure serves as a barometer of portfolio momentum — a ratio above 1.0 signals that the book of business is growing, since more premium is being written than is being recognized as revenue from existing policies, while a ratio below 1.0 suggests contraction. The metric is widely used by underwriters, financial analysts, and management teams to gauge whether new business production is outpacing the runoff of in-force policies.
⚙️ To understand how the ratio operates in practice, consider the mechanics of premium recognition. When an insurer binds a twelve-month policy, the full gross written premium is recorded at inception, but earning occurs ratably over the policy term — typically on a pro-rata daily basis. During periods of rapid growth — whether driven by rate increases in a hard market, expansion into new lines, or a successful MGA distribution push — written premium surges ahead of earned premium, pushing the ratio well above 1.0. Conversely, if an insurer is deliberately shrinking its book or losing renewals, earned premium from policies already in force can exceed new writings. The ratio is particularly informative at the segment level: a specialty division writing annual policies might show a ratio near 1.0 in a steady state, while a catastrophe-focused book with shorter policy terms can exhibit sharper seasonal swings. Analysts often track the ratio over multiple quarters to distinguish genuine growth trends from timing artifacts tied to large account placements or treaty renewals.
💡 Beyond its role as a growth indicator, the written to earned ratio carries important implications for cash flow management and reserving. A persistently high ratio means that an insurer is collecting premium cash faster than it recognizes income, which can create a temporary liquidity cushion but also inflates unearned premium reserves on the balance sheet — a liability that must be supported by adequate capital under frameworks such as Solvency II and the risk-based capital system in the United States. Rating agencies and regulators pay attention to unusually elevated ratios because rapid growth can strain an insurer's ability to maintain underwriting discipline and claims-handling capacity. For insurtech startups and newer program administrators in particular, demonstrating a healthy written to earned trajectory — one that reflects controlled, profitable expansion rather than indiscriminate volume chasing — is a key element in earning confidence from capacity providers and investors alike.
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