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🏗️ '''Building block approach (BBA)''' is the default measurement model under [[Definition:IFRS 17 | IFRS 17]] for valuing insurance contracts on an insurer's balance sheet, sometimes referred to as the general measurement model (GMM). It constructs the liability for a group of insurance contracts by stacking together four distinct components — estimates of future cash flows, a discount adjustment for the time value of money, a [[Definition:Risk adjustment | risk adjustment]] for non-financial risk, and the [[Definition:Contractual service margin (CSM) | contractual service margin (CSM)]] — hence the name "building blocks." The approach applies to most [[Definition:Life insurance | life]], [[Definition:Health insurance | health]], and long-duration [[Definition:Non-life insurance | non-life]] contracts, though short-duration contracts may qualify for the simplified [[Definition:Premium allocation approach (PAA) | premium allocation approach]] and certain participating contracts use the [[Definition:Variable fee approach (VFA) | variable fee approach]].

⚙️ At initial recognition, an insurer estimates all future cash inflows and outflows attributable to a group of contracts — [[Definition:Premium | premiums]], [[Definition:Claims | claims]], [[Definition:Acquisition cost | acquisition costs]], and maintenance expenses — and discounts them to present value using rates that reflect the characteristics of the cash flows. A risk adjustment is added to capture the compensation the insurer requires for bearing uncertainty in the timing and amount of those cash flows. The residual amount — the expected unearned profit — is stored in the CSM and released into the [[Definition:Income statement | income statement]] systematically as the insurer delivers coverage over the contract's service period. At each subsequent reporting date, the insurer re-measures the fulfilment cash flows using current assumptions. Changes relating to future service adjust the CSM (and therefore shift profit recognition forward or backward), while changes relating to current or past service flow directly into profit or loss. This layered re-measurement mechanism is what distinguishes the BBA from earlier approaches under [[Definition:IFRS 4 | IFRS 4]], which permitted a wide variety of local accounting practices and made cross-border comparison notoriously difficult.

📈 The practical significance of the BBA extends well beyond accounting departments. By locking expected profit into the CSM and releasing it over the coverage period, the model smooths earnings volatility and aligns reported profit with the actual delivery of insurance service — a shift that has altered how analysts in markets from Hong Kong to London evaluate insurer performance. Implementation has been a multi-year, resource-intensive effort for carriers worldwide, requiring upgrades to [[Definition:Actuarial modeling | actuarial models]], [[Definition:Data architecture | data infrastructure]], and finance systems. In jurisdictions such as the European Union, Australia, and Singapore, the BBA is now embedded in statutory reporting, while the United States continues to operate under [[Definition:US GAAP | US GAAP]] standards that follow a different measurement philosophy. For [[Definition:Reinsurance | reinsurance]] contracts held, the BBA is applied with certain modifications, ensuring that the economics of ceded risk are presented consistently with the underlying direct contracts.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:IFRS 17]]
* [[Definition:Contractual service margin (CSM)]]
* [[Definition:Risk adjustment]]
* [[Definition:Premium allocation approach (PAA)]]
* [[Definition:Variable fee approach (VFA)]]
* [[Definition:Fulfilment cash flows]]
{{Div col end}}

Definition:Building block approach (BBA) - Revision history

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