https://www.insurerbrain.com/w/index.php?action=history&feed=atom&title=Definition%3ABook_yield 2026-05-02T23:21:58Z Revision history for this page on the wiki MediaWiki 1.43.8 https://www.insurerbrain.com/w/index.php?title=Definition:Book_yield&diff=19807&oldid=prev 2026-03-17T08:41:46Z

<p>Bot: Creating new article from JSON</p> <p><b>New page</b></p><div>📊 &#039;&#039;&#039;Book yield&#039;&#039;&#039; is the weighted average rate of return earned on an insurance company&#039;s [[Definition:Investment portfolio | investment portfolio]], calculated using the original cost (or amortized cost) of the assets rather than their current market value. For insurers — whose business model depends on investing [[Definition:Premium | premiums]] collected today to pay [[Definition:Claims | claims]] in the future — book yield is one of the most closely watched measures of investment performance because it reflects the actual income being generated relative to the capital deployed in the portfolio.<br /> <br /> 📈 The calculation divides the annual [[Definition:Investment income | investment income]] (interest, dividends, and other recurring returns) by the average book value of invested assets over the same period. Because most insurance investment portfolios are dominated by [[Definition:Fixed income | fixed-income securities]] held at amortized cost, book yield tends to change gradually — it lags movements in prevailing market interest rates as older bonds mature and are replaced with new purchases at current yields. This lagging behavior is especially pronounced in [[Definition:Life insurance | life insurance]] and [[Definition:Annuity | annuity]] portfolios, which hold longer-duration assets. Under [[Definition:US GAAP | US GAAP]] and [[Definition:IFRS 17 | IFRS]] frameworks alike, the distinction between book yield and [[Definition:Market yield | market yield]] matters for financial reporting: book yield governs the income statement, while unrealized gains and losses flow through other comprehensive income or are reflected in [[Definition:Solvency II | Solvency II]] market-consistent balance sheets in European jurisdictions.<br /> <br /> 💡 Tracking book yield over time reveals how well an insurer&#039;s investment team is navigating the interest-rate environment and managing [[Definition:Asset-liability management (ALM) | asset-liability matching]]. A rising book yield in a declining rate environment, for instance, may indicate that the portfolio is locked into higher-coupon bonds — an advantage in the near term but a potential [[Definition:Reinvestment risk | reinvestment risk]] issue as those bonds mature. [[Definition:Rating agency | Rating agencies]] and [[Definition:Insurance regulator | regulators]] scrutinize book yield trends alongside [[Definition:Combined ratio | combined ratio]] performance to assess whether an insurer&#039;s total return adequately supports its [[Definition:Policyholder | policyholder]] obligations. In markets such as Japan, where prolonged low interest rates have compressed book yields for decades, this metric has been central to strategic decisions around product design, [[Definition:Reinsurance | reinsurance]] purchasing, and even mergers.<br /> <br /> &#039;&#039;&#039;Related concepts:&#039;&#039;&#039;<br /> {{Div col|colwidth=20em}}<br /> * [[Definition:Investment income]]<br /> * [[Definition:Asset-liability management (ALM)]]<br /> * [[Definition:Net investment yield]]<br /> * [[Definition:Total return]]<br /> * [[Definition:Reinvestment risk]]<br /> * [[Definition:Fixed income]]<br /> {{Div col end}}</div>

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