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Effect of Investment Portfolio Duration on Insurance Capital Requirements

Abstract

Insurance companies invest premium income and other financial resources in various assets to generate returns and support their long-term obligations. The duration of an investment portfolio indicates the sensitivity of asset values to changes in interest rates and is particularly important for insurers with substantial fixed-income investments. Changes in portfolio duration can influence investment risk, asset values, and the amount of capital required to absorb potential financial losses. The study examines the effect of investment portfolio duration on insurance capital requirements. It focuses on how differences in the duration of insurers’ investment portfolios may influence their exposure to interest rate risk and the level of capital required to support such exposures. The study will assess the relationship between portfolio duration, investment risk, asset values, capital requirements, and solvency positions. The study will consider indicators such as portfolio duration, modified duration, interest rate sensitivity, investment returns, asset volatility, available capital, required capital, and solvency ratios. Actuarial investment risk models, duration analysis, sensitivity analysis, scenario analysis, and stress testing will be applied to assess the potential effect of interest rate movements on investment portfolios and capital requirements. Alternative interest rate scenarios will be examined to estimate potential changes in capital needs. A quantitative research approach will be adopted for the study. Relevant investment and financial data from selected insurance companies will be collected and analysed using descriptive statistics, correlation analysis, regression analysis, duration analysis, and actuarial risk assessment techniques. The investment portfolio duration of insurers will be compared with their capital requirements and solvency indicators under different interest rate scenarios. The study is expected to reveal that longer investment portfolio durations may increase insurers’ sensitivity to interest rate changes and consequently increase capital requirements under adverse market conditions. Significant changes in interest rates may cause greater fluctuations in the market value of long-duration assets, thereby increasing potential investment losses and capital pressures. The analysis may also indicate that appropriate duration management can reduce interest rate exposure and support more stable capital positions. The findings are expected to provide useful information for insurance companies, actuaries, investment managers, regulators, and risk managers in managing investment-related capital requirements. The study may support improved asset-liability management, investment portfolio structuring, interest rate risk management, capital planning, and solvency monitoring. It may also assist insurers in determining suitable portfolio durations in relation to their financial obligations and risk-bearing capacity. The study concludes that investment portfolio duration can significantly influence insurance capital requirements through its effect on interest rate sensitivity and investment risk. It is therefore recommended that insurers regularly monitor portfolio duration, conduct interest rate stress tests, and align investment duration with their liabilities and capital capacity to maintain adequate financial resilience.

Keywords: Investment portfolio duration, insurance capital requirements, interest rate risk, investment risk, capital adequacy, solvency, asset-liability management, portfolio duration, modified duration, investment returns, asset volatility, available capital, required capital, actuarial risk modelling, financial resilience.