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📋 '''Contractual Service Margin (CSM)''' is a component of the [[Definition:Insurance contract | insurance contract]] liability under [[Definition:IFRS17 | IFRS17]] that represents the unearned profit an insurer expects to recognize as it delivers coverage and other services over the life of a contract group. Rather than allowing carriers to book anticipated gains at inception, the standard parks that profit in the CSM and releases it into the income statement over the [[Definition:Coverage period | coverage period]], aligning reported earnings with the actual provision of insurance services. The CSM exists only for groups of contracts that are not [[Definition:Onerous contract | onerous]] at initial recognition — if a group is expected to generate a loss, that loss is recognized immediately.

⚙️ At each reporting date the CSM is adjusted for several factors before a portion is released to profit or loss. Changes in estimates of future [[Definition:Fulfilment cash flows | fulfilment cash flows]] that relate to future service — for instance, a revised [[Definition:Claims | claims]] frequency assumption on a block of life contracts — "unlock" the CSM, increasing or decreasing it rather than flowing directly through earnings. The margin also accretes interest at the rate locked in at initial recognition (under the [[Definition:Building Block Approach (BBA) | Building Block Approach]]) or at current rates (under the [[Definition:Variable Fee Approach (VFA) | Variable Fee Approach]]). Each period, a coverage-unit allocation determines how much of the remaining CSM is earned, reflecting the pattern in which the insurer provides services and bears [[Definition:Risk | risk]].

💡 The CSM fundamentally changes how the market interprets an insurer's profitability. A growing CSM balance signals a healthy pipeline of future earnings locked in by the existing book, giving analysts a forward-looking indicator that did not exist under IFRS 4. For management teams, the mechanics of the CSM create strong incentives to improve the accuracy of [[Definition:Actuarial estimate | actuarial estimates]] and to design products whose service patterns are well understood, because estimation quality directly affects the smoothness and predictability of reported profit.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:IFRS17]]
* [[Definition:Building Block Approach (BBA)]]
* [[Definition:Fulfilment cash flows]]
* [[Definition:Onerous contract]]
* [[Definition:Coverage period]]
* [[Definition:Risk adjustment]]
{{Div col end}}

Definition:Contractual Service Margin (CSM) - Revision history

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