For decades, the 60/40 portfolio, 60% in stocks and 40% in bonds, has been treated as something close to a gold standard for retirement investing. It is simple, it is well understood, and for a long stretch of market history it has held up reasonably well. But a fair question worth exploring, not a recommendation, is this: what if a retirement portfolio added a third bucket, one holding an asset whose returns do not move in sync with either stocks or bonds?
This article walks through what "uncorrelated" means, why the 60/40 has worked, where it can run into trouble, and what a 60/20/20 approach might offer instead. There is no single right answer here. The goal is to lay out the tradeoffs so you can think through what may fit your own situation.
Key Takeaways
- Stocks and bonds have historically moved in different directions, which is a big part of why the 60/40 portfolio has worked reasonably well, but that pattern broke down in 2022 and is not guaranteed to hold going forward.
- A 60/20/20 structure adds a third, uncorrelated sleeve, such as an indexed annuity, a CD, or cash, aimed at providing a buffer rather than higher returns, and it comes with its own set of tradeoffs.
- Academic research on sequence-of-returns risk suggests that poor market returns early in retirement can matter more than long-term averages, though no study can predict how any individual's retirement will actually unfold.
- Indexed annuities, CDs, and cash each carry different tax treatment, liquidity, and growth potential, so the tax impact of an allocation deserves as much attention as the allocation itself.
- Neither the 60/40 nor the 60/20/20 is inherently right or wrong; the better fit depends on income needs, time horizon, and risk tolerance, which is worth exploring with a financial professional.
Understanding Correlation and the 60/40 Portfolio
Correlation simply describes how two things move in relation to each other. When two assets tend to rise and fall together, they are considered correlated. When one tends to move in the opposite direction of the other, or at least does not reliably move in the same direction at the same time, they are considered uncorrelated (or negatively correlated).
Stocks and bonds have traditionally had low or negative correlation, which is a big part of why the 60/40 portfolio has worked as well as it has. When stocks fell, bonds have often held steady or gained, cushioning the overall portfolio. But that relationship is not guaranteed. In 2022, stocks and bonds both declined at the same time, something that had not happened in roughly two decades. Research from AQR Capital Management and the International Monetary Fund has suggested this shift in correlation may be more than a one-off event, and could persist longer than past episodes of stock-bond correlation breakdown.
The classic 60/40 allocates 60% of a portfolio to stocks for growth and 40% to bonds for stability and income. Its appeal is straightforward: it is simple to understand, it has historically offered meaningful diversification, and it is inexpensive to implement. The approach relies heavily on the idea that when stocks fall, bonds will typically hold steady or rise, smoothing out the ride. The disadvantage is that when stock-bond correlation breaks down, as it did in 2022, both sides of the portfolio can fall at the same time, leaving little or no cushion.
This matters more in retirement than during your working years. A 2025 CFA Institute report by Cui, Pham, and Ruthbah of Monash University used Monte Carlo simulations and found that sequence-of-returns risk can seriously undermine the sustainability of a 60/40 portfolio. Poor market returns early in retirement, the report noted, can dramatically accelerate the depletion of retirement savings, even if long-term average returns look fine on paper.
The 60/20/20 Alternative: Weighing the Uncorrelated Options
One idea some retirees explore is a 60/20/20 structure: 60% stocks, 20% bonds, and 20% in an asset class whose returns are not closely tied to either. That third sleeve might include an indexed annuity, a certificate of deposit (CD), or cash.
The point of this sleeve is not that it will outperform stocks or bonds. It is that it may provide a buffer you can draw from when both stocks and bonds are down at the same time, reducing the need to sell equities at a loss to fund living expenses. This idea connects directly to sequence-of-returns risk. If a retiree can avoid selling stocks during a downturn, the equity portion of the portfolio has more shares left to participate when markets eventually recover. That does not eliminate risk, and it does not guarantee a better outcome, but it is one way some retirees try to reduce forced selling during the years when a downturn would do the most damage.
None of the following options is better than the others in a vacuum. Each comes with its own set of tradeoffs, and the right choice depends on a retiree's income needs, liquidity requirements, tax situation, and risk tolerance.
Indexed annuities offer tax-deferred growth, with returns linked to a market index but with some downside protection built in. Certain contracts can provide guaranteed income for life. The tradeoffs include surrender charges, caps on how much upside you can capture, added complexity, and reduced liquidity compared to other options.
Certificates of deposit (CDs) are FDIC-insured up to applicable limits, offer predictable returns, and are simple to understand. The tradeoffs: interest is taxable as ordinary income, yields may not keep pace with inflation, and early withdrawal typically triggers a penalty.
Cash offers maximum liquidity and flexibility, with no market risk and easy access. The tradeoff is that cash has the lowest expected long-term return of the three, and inflation can erode its purchasing power over time, which may leave it unable to provide enough growth to help sustain a long retirement on its own.
What the Research Says About Portfolio Longevity
Researchers Wade Pfau and Michael Kitces published work in 2014 on a "rising equity glidepath," which found that starting retirement with fewer stocks and gradually increasing that allocation over time functioned as a risk management technique during some of the worst historical retirement sequences.
The CFA Institute's 2025 report goes further, advocating for flexible, personalized retirement planning rather than a one-size-fits-all approach, and it explicitly states that the 60/40 does not guarantee retirement security for all retirees. Pfau has separately written that tools like annuities, when fit thoughtfully into a broader retirement plan, can potentially add value because they may reduce the need to sell growth assets during downturns.
The overall takeaway is not that one allocation wins. The research suggests that adding an uncorrelated buffer can improve sustainability for some retirees, particularly those most exposed to sequence-of-returns risk, while acknowledging that outcomes are never certain.
Suitability and Tax Considerations
A traditional 60/40 may suit retirees who value simplicity, who have other reliable income sources such as a pension or strong Social Security benefit, and who have a long enough time horizon to ride out market volatility without needing to touch the portfolio right away.
A 60/20/20 approach may be worth a closer look for retirees who are close to retirement or in the early "retirement risk zone" (roughly the first five to ten years), those whose income depends almost entirely on their portfolio, or those who simply want a psychological buffer against market downturns. This is not a question of one approach being right and the other wrong. It is about matching the allocation to your own circumstances, and that is exactly the kind of coordinated retirement planning work a financial advisor can help you think through, for example using a structured bucket strategy to organize which assets fund near-term spending versus long-term growth.
Because taxes affect how long retirement savings actually last, it is worth understanding how each option is taxed. An indexed annuity grows tax-deferred, with withdrawals taxed as ordinary income. CD interest is taxed as ordinary income each year it is earned, whether or not you withdraw it. Cash held in an interest-bearing account also generates taxable interest, typically a smaller amount. A coordinated approach that weighs the tax impact of each sleeve alongside the investment allocation itself can help retirement savings stretch further.
The 60/40 portfolio has served many retirees well, and it may well continue to do so for many more. Adding an uncorrelated asset is not about abandoning stocks and bonds. It is about considering a third layer of protection that may help a portfolio weather some of the specific risks retirement brings, particularly sequence-of-returns risk. The right allocation is the one that fits your individual goals, risk capacity, time horizon, and tax situation, not a formula that applies equally to everyone.
Retirement Tax Review
If you are weighing how a traditional 60/40 portfolio, a 60/20/20 structure, or something in between might fit your retirement plan, and would like a second opinion on how the tax treatment of each option affects your overall picture, we would be glad to help.
At Wealth Ease Wealth Management, our team works to coordinate the investment, tax, and income planning pieces that affect your retirement readiness. We can help identify potential gaps or opportunities in your current allocation and how it may interact with your tax situation. Results will vary by individual and depend on your complete financial picture; we make no guarantees of any specific outcome.
Schedule a Retirement Tax Review with our team, no cost, no obligation. We will walk through your situation together and help you understand where your plan may have room to improve.
This article is for educational purposes only and does not constitute investment, tax, or legal advice, and it is not a recommendation to buy, sell, or hold any security or insurance product. It does not take into account any individual's specific financial situation, objectives, or risk tolerance. Indexed annuities are insurance products with contract-specific terms, fees, caps, and surrender schedules that vary by carrier, and CDs are bank deposit products with their own terms; review any contract or account disclosures carefully before making a decision. Diversification and asset allocation do not ensure a profit or protect against loss, and any allocation involves risk, including possible loss of principal. The academic research referenced above reflects historical analysis and modeling, not a guarantee of future results. Consult a qualified financial, tax, or legal professional about your specific circumstances before making any decisions.
Frequently asked questions
What is an uncorrelated asset class?
An uncorrelated asset is one whose returns do not move in sync with another asset. If stocks and bonds are falling together, an uncorrelated asset is designed to hold relatively steady, offering a buffer rather than a guarantee. Cash, CDs, and indexed annuities are commonly discussed examples, though correlation between any two assets can shift over time.
Does the 60/20/20 portfolio outperform the 60/40?
Not necessarily, and outperformance is not really the point. A 60/20/20 allocation trades some growth potential for a buffer that may reduce the need to sell stocks at a loss during a downturn. Whether it helps a given retiree depends on their income needs, time horizon, and how markets behave, none of which can be predicted with certainty.
What are the disadvantages of adding an uncorrelated asset to a retirement portfolio?
Reducing stock and bond exposure to make room for cash, a CD, or an indexed annuity can mean giving up some long-term growth potential. Indexed annuities can carry surrender charges, caps on upside, and less liquidity. CDs and cash may not keep pace with inflation. There is no allocation that avoids trade-offs entirely.
Is an indexed annuity better than cash for retirement?
Neither is universally better. An indexed annuity can offer tax-deferred growth and, in some contracts, guaranteed lifetime income, but it typically comes with less liquidity and more complexity. Cash offers maximum flexibility and no market risk, but its purchasing power can erode with inflation. The right fit depends on the individual's income needs, liquidity needs, and tax situation.
How are indexed annuities, CDs, and cash taxed differently in retirement?
Indexed annuities grow tax-deferred, so withdrawals are generally taxed as ordinary income when they are taken. CD interest is taxed as ordinary income each year it is credited, whether or not it is withdrawn, and interest earned on cash held in an account is taxed the same way, typically in smaller amounts. Because the tax treatment differs across all three, it is worth weighing that impact alongside each option's return potential and liquidity.