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🔄 '''Earn-through''' refers to the process by which [[Definition:Premium | premiums]] written during one accounting period are recognized as [[Definition:Earned premium | earned premium]] over the coverage period of the underlying policies, and by extension, the time it takes for the economic impact of [[Definition:Rate increase | rate changes]], new business, or portfolio adjustments to fully flow through an insurer's income statement. In insurance financial analysis, the earn-through concept is central to understanding why changes in pricing or [[Definition:Underwriting | underwriting]] strategy do not produce instant profit improvements — benefits materialize gradually as policies incur and expire.

⚙️ Consider a [[Definition:Property and casualty insurance | property and casualty insurer]] that implements a 10% rate increase on its annual policies starting January 1. Policies renewing in January begin earning the higher premium immediately, but policies renewing in December will not reflect the increase until the following year, and even those January renewals will only be fully earned by the end of the twelve-month policy term. As a result, the full impact of the rate change on [[Definition:Earned premium | earned premiums]] takes roughly 24 months to work through the book. The precise earn-through profile depends on policy term lengths, the distribution of renewal dates, and the mix between new and renewal business. [[Definition:Reinsurance | Reinsurance]] treaties, particularly those written on a [[Definition:Losses occurring basis | losses-occurring]] versus [[Definition:Risks attaching basis | risks-attaching]] basis, introduce additional timing considerations. Analysts and [[Definition:Actuarial | actuaries]] model earn-through curves to project forward income statements and to assess whether reported [[Definition:Combined ratio | combined ratios]] already reflect recent underwriting actions or still contain stale premium from prior rating levels.

💡 Getting earn-through projections right matters enormously for management teams communicating with investors and for [[Definition:Rating agency | rating agencies]] evaluating the trajectory of an insurer's performance. During a [[Definition:Hard market | hard market]] turn, carriers that have aggressively pushed rate will often point to earn-through as a reason that reported results have not yet caught up with stated rate adequacy — a legitimate argument, but one that analysts must verify against actual [[Definition:Loss ratio | loss ratio]] trends. Conversely, when market conditions soften and competitive pressures force rate reductions, earn-through works in reverse: today's softer pricing will drag on future earnings long after the competitive decision has been made. Understanding this lag effect is equally important for [[Definition:Insurtech | insurtech]] MGAs and [[Definition:Managing general agent (MGA) | MGAs]] building financial models around rapid growth, where the mismatch between written and earned premium can strain cash flow and obscure true underwriting profitability in early years.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Earned premium]]
* [[Definition:Written premium]]
* [[Definition:Unearned premium reserve]]
* [[Definition:Rate increase]]
* [[Definition:Combined ratio]]
* [[Definition:Loss ratio]]
{{Div col end}}

Definition:Earn-through - Revision history

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