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Optimal Asset Allocation for Defined Contribution Pension to Minimize Shortfall Risk of Income Replacement Rate

소득대체율 부족 위험 최소화를 위한 확정기여형 퇴직연금제도의 최적자산배분

  • Received : 2024.01.29
  • Accepted : 2024.03.12
  • Published : 2024.03.31

Abstract

This study aims to propose an optimal asset allocation that minimizes the risk of insufficient realized replacement rates compared to the OECD average replacement rate. To do this, we set the shortfall risk of replacement rates and calculates an asset allocation plan to minimize this risk based on the period of enrollment, the income level and additional contribution. We consider stocks and deposits as investment assets, using Monte Carlo simulation with a GBM model to generate return distributions for stocks. Our result show that, for individuals with a enrollment period of less than 30 years, participants should invest a minimum of 70-80% of their funds in risky assets to minimize the shortfall risk. However, the proportion of funds that need to be invested in risky assets declines significantly when participants contribute an additional premiums. This effect is particularly pronounced among low-income individuals. Therefore, to achieve OECD average replacement rates, the government needs to incentivize participants to invest more in risky assets, while also providing policies to encourage additional contributions, especially for the low-income population.

본 연구는 OECD 평균 수준의 소득대체율 대비 실현 소득대체율이 부족할 위험을 최소화하는 자산배분안을 제안하는 데 그 목적이 있다. 이를 위해 본 연구는 소득대체율 부족 위험을 정의하고 이를 최소화하는 최적 자산배분안을 퇴직연금제도 가입기간, 가입자 소득수준, 추가부담금 수준별로 산출하여 제시하였다. 이를 위해 본 연구는 투자의 대상으로 주식과 예금을 고려하였으며 주식의 경우 GBM 모형에 몬테카를로 시뮬레이션을 수행하여 수익률 분포를 생성하였다. 분석결과, 퇴직연금제도 가입 기간이 30년 이하인 경우, 가입자는 적립금의 최소 70~80%를 위험자산에 투자해야 소득대체율 부족 위험을 최소화할 수 있는 것으로 나타났다. 다만, 가입자가 부담금을 추가 납부할 경우 위험자산의 최적 투자 비중은 큰 폭으로 하락하였으며, 이러한 효과는 저소득자에서 크게 나타났다. 따라서, OECD 평균 수준의 소득대체율을 달성하기 위해 정부는 가입자들이 일정 수준 이상의 적립금을 위험자산에 투자할 수 있도록 유인하는 가운데 저소득층에게는 추가부담금 납입을 유인하기 위한 보조금 정책 등을 검토할 필요가 있다.

Keywords

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