As individuals transition into retirement, the focus of portfolio management shifts from accumulation to decumulation. This change alters the risk/return paradigm because the investor is now concerned with sustaining their portfolio to provide income throughout retirement rather than simply maximizing returns.
The single-period model used during accumulation is no longer sufficient, as retirees must consider a multi-period framework that spans the remainder of their lives.
In this new paradigm, return is no longer measured as a percentage gain on the portfolio but rather as the actual cash withdrawn to meet living expenses. The key risk shifts from variability or volatility to the risk of portfolio exhaustion—that is, the possibility that the portfolio will be depleted before the end of the retiree's life. This shift in focus necessitates a different approach to managing the portfolio, where the primary concern is ensuring that the portfolio can support withdrawals over an extended period.
The more cash withdrawn from the portfolio, the higher the risk of exhaustion. This introduces a trade-off between return and risk that is particularly important in retirement planning.
While everyone desires higher returns, doing so by withdrawing more from the portfolio increases the risk of depleting it too soon. Therefore, identifying the optimal withdrawal rate that balances the need for income with the risk of portfolio failure is a critical aspect of retirement income planning.
Shifting to the Retirement Income Portfolio
