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📈 '''Yield to maturity (YTM)''' is the total annualized return an investor can expect to earn on a [[Definition:Fixed-income security | fixed-income security]] if it is held until its maturity date and all coupon and principal payments are made as scheduled. For insurance companies — which collectively rank among the world's largest bondholders — YTM is a foundational metric used to evaluate the attractiveness of individual bonds and entire [[Definition:Investment portfolio | investment portfolios]], inform [[Definition:Asset-liability management (ALM) | asset-liability matching]] decisions, and project the investment income that supports [[Definition:Policyholder | policyholder]] obligations. Unlike a bond's coupon rate, YTM accounts for the purchase price relative to par value, the time remaining to maturity, and the reinvestment of interim cash flows, making it a more comprehensive gauge of expected return.

⚙️ Calculating YTM involves solving for the [[Definition:Discount rate | discount rate]] that equates the present value of a bond's future cash flows — coupons plus the return of principal — to its current market price. In practice, insurance investment teams and their [[Definition:Asset manager | asset managers]] rely on YTM to compare securities across different maturities, credit qualities, and structures on a consistent basis. Under [[Definition:IFRS 17 | IFRS 17]], the discount rates used to measure insurance contract liabilities often draw on yield curves constructed from market-observable data, and the YTM of assets backing those liabilities feeds into analyses of whether the insurer's [[Definition:Investment income | investment income]] will be sufficient to meet projected [[Definition:Claims | claims]]. Similarly, under [[Definition:US GAAP | US GAAP]], life insurers performing [[Definition:Loss recognition testing | loss recognition testing]] or computing [[Definition:Interest maintenance reserve (IMR) | interest maintenance reserves]] must track how shifts in YTM across the portfolio affect realized and unrealized gains. In [[Definition:Solvency II | Solvency II]] jurisdictions, the risk-free yield curve prescribed by [[Definition:European Insurance and Occupational Pensions Authority (EIOPA) | EIOPA]] serves as the baseline against which insurers measure the sufficiency of their asset yields.

💡 The strategic importance of YTM becomes especially visible in low-interest-rate environments, where declining yields on new bond purchases compress the spread between what insurers earn and what they owe. [[Definition:Life insurance | Life insurers]] and [[Definition:Annuity | annuity]] providers with long-duration [[Definition:Guaranteed rate | guarantees]] are particularly exposed: if reinvested premiums earn a lower YTM than the rate assumed in product pricing, the resulting shortfall accumulates over decades and can necessitate [[Definition:Reserve strengthening | reserve strengthening]]. In Japan, this phenomenon contributed to a wave of life insurer insolvencies in the late 1990s and early 2000s, and it remains a closely watched risk in European markets. On the [[Definition:Property and casualty insurance | property and casualty]] side, where liability durations tend to be shorter, YTM still matters because it influences how aggressively an insurer can price [[Definition:Premium | premiums]] while counting on investment returns to supplement [[Definition:Underwriting profit | underwriting results]]. Monitoring portfolio YTM is therefore not merely a treasury exercise but a discipline that connects investment performance directly to insurance pricing, reserving, and solvency.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Asset-liability management (ALM)]]
* [[Definition:Discount rate]]
* [[Definition:Zero-coupon bond]]
* [[Definition:Yield spread]]
* [[Definition:Reinvestment risk]]
* [[Definition:Investment income]]
{{Div col end}}

Definition:Yield to maturity (YTM) - Revision history

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