At 61 years old, what is the best way to transition from an all stock portfolio to a 60% stock 40% bond portfolio?
This is a difficult question to answer without knowing your specific set of circumstances. To narrow the scope I will assume the following: 1) you will retire at 65, 2) you will take a 4% annual distribution from the portfolio upon retirement, and 3) you are using a globally-diversified portfolio like the one we outline in The Ultimate Buy-and-Hold Strategy.
Regarding the third assumption, it is extremely important to understand that different portfolios have different risk characteristics. A 60% stock 40% bond (60/40) portfolio allocated to the S&P 500 and high-yield junk bonds is entirely different and much riskier than the one discussed in the aforementioned article.
That said, I would make the switch immediately. With four years until retirement you cannot afford to subject the entirety of your portfolio to the risks associated with stocks.
For perspective, consider that the financial crisis cut the average stock portfolio value in half. Taking distributions from an all-stock portfolio during such a time period has disastrous consequences on the longevity of your assets. This is why, as investors near retirement (the distribution phase of a portfolio), they should – as you’ve indicated – consider adding a preservation component (bonds) to their portfolio.
If the goal is to achieve a 60/40 allocation by retirement, many people will initiate the transition process around the time they reach age 50. This longer time frame for transition allows the use of ordinary cash flows and rebalancing opportunities to make it a cost-effective and natural process. Your situation calls for a less subtle shift. Nonetheless, it is a shift in the right direction and, as mentioned above, I would proceed.