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💵 '''Treasury bill (T-bill)''' is a short-term government debt instrument — typically maturing in four, eight, thirteen, twenty-six, or fifty-two weeks — that plays a foundational role in the [[Definition:Investment portfolio | investment portfolios]] of [[Definition:Insurance carrier | insurance carriers]] worldwide. Issued at a discount to face value and redeemed at par upon maturity, T-bills carry virtually no [[Definition:Credit risk | credit risk]] when backed by sovereign governments such as the United States, the United Kingdom, or Japan. For insurers, T-bills serve as a core component of the liquid, high-quality asset base that regulators and [[Definition:Rating agency | rating agencies]] expect carriers to maintain against near-term [[Definition:Claims | claims]] obligations and [[Definition:Reserve | reserves]].

🔄 Insurers purchase T-bills primarily to manage [[Definition:Liquidity risk | liquidity risk]] and match the duration of short-tail [[Definition:Liability | liabilities]]. Because T-bills mature quickly and trade in deep, active secondary markets, they can be converted to cash with minimal price disruption — a critical feature when a [[Definition:Catastrophe | catastrophe]] event triggers a sudden surge in [[Definition:Claims payment | claims payments]]. Under [[Definition:Solvency II | Solvency II]] in Europe, U.S. [[Definition:Risk-based capital (RBC) | risk-based capital]] frameworks, and comparable regimes in Asia, sovereign T-bills typically attract the lowest capital charges among fixed-income instruments, making them efficient tools for satisfying [[Definition:Regulatory capital | regulatory capital]] requirements. Investment teams at insurers and [[Definition:Reinsurance | reinsurers]] also use T-bills as collateral in [[Definition:Securities lending | securities lending]] programs and as benchmarks for measuring the spread earned on riskier portions of the portfolio.

📊 The significance of T-bills extends well beyond simple cash management. During periods of market stress — such as a financial crisis or a cluster of large [[Definition:Insured loss | insured losses]] — insurers that hold adequate T-bill positions can meet policyholder obligations without being forced to liquidate longer-duration or less-liquid assets at distressed prices. T-bill yields also serve as a reference rate influencing the [[Definition:Discount rate | discount rates]] applied to [[Definition:Loss reserve | loss reserves]] under frameworks like [[Definition:IFRS 17 | IFRS 17]] and [[Definition:US GAAP | US GAAP]]. In this way, movements in T-bill markets ripple directly into an insurer's reported profitability, reserve adequacy, and balance-sheet strength.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Treasury bond]]
* [[Definition:Investment portfolio]]
* [[Definition:Liquidity risk]]
* [[Definition:Asset-liability management (ALM)]]
* [[Definition:Risk-based capital (RBC)]]
* [[Definition:Discount rate]]
{{Div col end}}

Definition:Treasury bill (T-bill) - Revision history

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