In early January 2024, I wrote an answer to reader-of-the-blog Vince’s question about his retirement portfolio. A quick summary of that article is:
Winning the Game: Retiring at 57 with $4.2M
Vince wrote back! He asked this week:
Ahh! Rebalancing. Let’s dive in.
Two Sentences on Rebalancing
Rebalancing is the act of adjusting the asset allocation within an investment portfolio (how much in stocks? how much in bonds? etc.) to maintain the desired level of risk and return.
To learn more, here’s a deep dive on the topic of rebalancing.
Vince’s Question, Summarized
This is such an interesting question!
Vince is asking:
- Should Vince’s rebalancing go in both directions?
- If stocks are up compared to bonds, should Vince sell stocks to buy more bonds?
- If stocks are down compared to bonds, should he sell bonds to buy more stocks?
- Why does it matter? Because part of Vince’s portfolio approach is that his bond allocation represents 20 years’ worth of spending in his portfolio. He’s not measuring in percentages! He’s measuring in years’ worth of spending.
- So, in essence, Vince is asking: should he rebalance, even if doing so results in him having “fewer years of bonds” than he’s comfortable with?
We need to understand two different schools of thought regarding portfolio construction. These two schools are definitely similar but with slight, nuanced differences.
The first is the“bottoms-up, bucket method” described on the blog before. It recommends an investor assign a timeline to every dollar in their portfolio, then align those timelines with appropriate levels of risk in investment assets. The money with a 6-month timeline needs to be in cash or ultra low-risk Treasury notes. The money with a 30-year timeline should be in higher risk assets (like stocks) in search of greater returns.
The other common approach is the “expected risk, expected return” method. This approach uses historical data and the investor’s unique risk appetite (a combination of their age, their cashflow needs, their unique mental approach to losing money, etc.) to hone in on the “right” allocation for them. Younger, riskier investors can stomach more stocks, while older, risk-averse investors should own more bonds, etc.
Ideally, the portfolio’s future “expected returns” are then used to test the validity of the overall financial plan (e.g. via Monte Carlo simulation).
Which Method is “Right?”
Which method is right?
Both methods work. And, in theory, both should lead to very similar outcomes. The two methods differ more in mindset than in “brass tacks.”
I prefer the “bottoms-up, bucket method” because it puts planning first (“give the dollar a job and a timeline”) and then determines appropriate investments. I used that approach in my original response to Vince. He is also using that method in his new question today. Vince feels particularly safe with 20 years’ worth of spending in fixed income. Those dollars have timelines, and he’s built an appropriate cash, CD, and bond ladder for those timelines.
Is It Right to Rebalance?
Should Vince rebalance? Let’s start by using some reasonable numbers to add color to Vince’s question.
Let’s say Vince needs $100,000 per year from his portfolio. And, based on his personal risk tolerance, he wants 20 years of that annual spending in bonds**. Easy math. That’s $2 million in bonds.
Ok. $2 million in bonds, meaning the rest of Vince’s $4.3M portfolio (as of this writing) is in stocks. That’s $2.3M in stocks. That’s a 55% stock, 45% bond allocation.
Next, we need hypothetical returns.
Let’s say over the rest of 2024, bonds provide their expected 5% interest while stocks drop 8%. But Vince withdraws $100,000 (from bonds, because that’s why they’re there) to support his annual expenditures. Vince’s portfolio will shift to $2.1M in stocks, $2.0M in bonds.
That’s a 51% stock, 49% bond portfolio. Should Vince rebalance to 55% / 45%?! Let’s go back to first principles. Why did Vince end up 55/45 in the first place?
Because he wanted 20 years of bonds to cover his next 20 years of expenses, and everything thereafter went to stocks. And because his financial plan appears to be perfectly successful with that portfolio.
We should look through that exact same lens when considering rebalancing.
- Does Vince still need 20 years of bonds to sleep at night? Or, with one more year in the rearview mirror, is he comfortable with 19 years of bonds? This is a mental/personal question.
- Depending on that answer, does Vince need more/fewer bonds than he has right now?
- And finally, does his financial plan’s probability of success change depending on his rebalancing? This is a math/brass tacks question.
Based on Vince’s investing rationale, his rebalancing decision is a function of bond prices.“I said I needed ~20 years of bonds to sleep at night; do I have them?”
The stock portion of his portfolio has little to do with that! If stocks go up 30%, but he still has 20 years of bonds, I don’t think he should rebalance into even more bonds.
Off the Balance Beam
As asset prices move, our portfolio allocations shift like desert sand beneath our feet. Our targeted risk and return can veer off course and our financial plan’s likelihood of success can decay. These are reasons to rebalance.
However, rebalancing isn’t always needed, depending on your portfolio and the unique rationale of your financial plan. As in Vince’s case, some market movements create more rebalancing needs than others.
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This post was previously published on The Best Interest.
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