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📊 '''Contractual service margin (CSM)''' is an accounting concept introduced by [[Definition:IFRS 17 | IFRS 17]] that represents the unearned profit an [[Definition:Insurance carrier | insurer]] expects to recognize over the [[Definition:Coverage period | coverage period]] of a group of [[Definition:Insurance contract | insurance contracts]]. Unlike previous accounting standards that allowed insurers considerable latitude in how and when they recognized profit, the CSM creates a liability on the [[Definition:Balance sheet | balance sheet]] equal to the future profit embedded in a portfolio of contracts, releasing it systematically as the insurer delivers [[Definition:Coverage | coverage]] services over time.

🔧 At initial recognition of a group of contracts, the insurer measures the expected [[Definition:Premium | premium]] inflows against the expected [[Definition:Claim | claims]], expenses, and [[Definition:Risk adjustment | risk adjustment]], with any resulting surplus recorded as the CSM. This margin is then adjusted at each reporting date for changes in estimates of future cash flows — favorable changes increase the CSM, while adverse changes reduce it, provided the CSM does not go below zero. If estimates deteriorate beyond the CSM balance, the excess is recognized immediately as a loss in the income statement, a mechanism known as the [[Definition:Onerous contract | onerous contract]] test. The release pattern typically follows [[Definition:Coverage unit | coverage units]], which reflect the quantity of service provided and the expected duration of each contract in the group.

📈 For insurance executives and investors, the CSM has become one of the most closely watched metrics under IFRS 17 because it effectively serves as a warehouse of future earnings, offering visibility into the profitability trajectory of an insurer's book. A growing CSM signals that newly written business is generating expected profit that will flow through the income statement in coming periods, while a shrinking margin may indicate competitive pricing pressure or deteriorating [[Definition:Underwriting | underwriting]] conditions. The CSM has also influenced product design, [[Definition:Reinsurance | reinsurance]] strategy, and capital allocation decisions, as management teams optimize not just for [[Definition:Combined ratio | combined ratio]] performance but for how results appear under the new reporting framework.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:IFRS 17]]
* [[Definition:Risk adjustment]]
* [[Definition:Onerous contract]]
* [[Definition:Coverage unit]]
* [[Definition:Premium allocation approach (PAA)]]
* [[Definition:Fulfilment cash flows]]
{{Div col end}}

Definition:Contractual service margin (CSM) - Revision history

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