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📅 '''Year of account''' is a fundamental accounting concept used primarily in the [[Definition:Lloyd's of London | Lloyd's of London]] market, referring to the calendar year in which an [[Definition:Insurance policy | insurance policy]] is written or a [[Definition:Lloyd's syndicate | syndicate]] accepts risk. Unlike conventional annual accounting, which tallies income and expenses on a fixed twelve-month cycle, the year of account in Lloyd's operates on a three-year development model: a syndicate keeps each underwriting year open for roughly 36 months, allowing [[Definition:Claims management | claims]] to develop and [[Definition:Premium | premiums]] to be collected before the year is formally closed. This approach reflects the long-tail nature of many [[Definition:Specialty insurance | specialty]] and [[Definition:Reinsurance | reinsurance]] lines where losses can take years to crystallize.

⚙️ When a syndicate opens a new year of account, all policies [[Definition:Underwriting | underwritten]] during that calendar year — along with their associated premiums, [[Definition:Loss reserve | loss reserves]], and expenses — are allocated to it. At the end of the typical three-year cycle, the syndicate's [[Definition:Managing agent | managing agent]] determines whether the year can be closed by transferring any remaining liabilities into the next open year through a process called [[Definition:Reinsurance to close (RITC) | reinsurance to close (RITC)]]. If the outstanding [[Definition:Claims liability | claims liabilities]] are too uncertain to quantify, the year of account may be left open beyond the standard period, a situation that demands additional [[Definition:Capital requirements | capital]] support and heightened regulatory scrutiny from [[Definition:Lloyd's of London | Lloyd's]]. Each year of account effectively functions as a self-contained fund with its own profit-or-loss outcome, giving [[Definition:Lloyd's Name | Names]] and [[Definition:Corporate member | corporate members]] a transparent view of performance by vintage.

📊 For investors, capital providers, and [[Definition:Syndicate member | syndicate members]], the year of account framework provides a disciplined lens through which to evaluate [[Definition:Underwriting performance | underwriting performance]] across different risk environments. Because results are segmented by the year risks were assumed, stakeholders can distinguish between a profitable 2019 book and a catastrophe-hit 2020 book rather than seeing them blended together. This granularity also aids [[Definition:Actuarial analysis | actuarial analysis]], [[Definition:Reserving | reserving]] adequacy reviews, and regulatory reporting. Outside Lloyd's, the concept occasionally surfaces in [[Definition:Company market | company market]] discussions or [[Definition:Run-off | run-off]] portfolios, but it remains most closely identified with the unique structure of the Lloyd's marketplace.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Lloyd's syndicate]]
* [[Definition:Reinsurance to close (RITC)]]
* [[Definition:Managing agent]]
* [[Definition:Underwriting]]
* [[Definition:Loss reserve]]
* [[Definition:Pure year of account]]
{{Div col end}}

Definition:Year of account - Revision history

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