For decades, a portfolio split roughly 60% equities and 40% bonds was treated almost as a default sensible balance for a retiree or cautious investor — enough growth potential from shares to sustain a long retirement, cushioned by bonds expected to hold steady or rise when equities fell. That relationship came under strain in the early 2020s, when a period of rising interest rates saw both equities and bonds fall together, challenging the assumption that bonds reliably offset equity losses. This has led many UK investors to ask whether the 60/40 approach is still a sound foundation, or whether it needs rethinking.
Why 60/40 became a standard reference point
The logic behind a 60/40 split rests on the historical tendency of bonds and equities to be negatively or weakly correlated — when share prices fall, often during periods of economic stress or falling interest rates, high-quality government bond prices have often risen, since falling rates increase the value of existing bonds paying a fixed rate. This meant that in many past downturns, a bond allocation cushioned the portfolio precisely when it was needed most, allowing a 60/40 investor to weather volatility better than an all-equity investor, while still capturing meaningful long-term growth from the equity portion.
What changed in the early 2020s
The period of higher and rising interest rates that followed the low-rate era saw bond prices fall sharply, because rising rates reduce the value of existing bonds paying lower fixed rates than newly issued ones. At the same time, many equity markets also experienced periods of decline, partly driven by the same higher interest rate environment increasing the discount rate applied to future company earnings. The result was a period where equities and bonds fell together — undermining the core diversification premise that has historically supported the 60/40 approach.
Why this happened
Historically, the negative correlation between equities and bonds has been closely tied to a specific economic backdrop: falling or low inflation, with central banks able to cut interest rates to support growth when equities fell. In an environment of higher and more persistent inflation, central banks raising rates to control inflation can simultaneously hurt bond prices and unsettle equity markets, breaking the pattern that made 60/40 reliable in prior decades.
Does this mean 60/40 is now unsafe?
Not necessarily — but it does mean the assumption that bonds will always cushion equity falls should not be treated as a certainty. A few points are worth weighing:
- Bonds still generally carry lower volatility than equities over most periods, even if their correlation with equities is not always negative.
- Higher interest rates, while painful for existing bond holders when rates first rise, mean newly issued bonds and bond funds now offer higher running yields than in the preceding low-rate decade, which may improve their long-term return prospects.
- Historical correlation patterns are not a law of markets — periods of positive correlation between equities and bonds have occurred before, notably around inflationary shocks in past decades, and can occur again.
- A 60/40 portfolio remains far less volatile than an all-equity portfolio over most extended periods, even if the diversification benefit is not perfectly reliable in every environment.
| Environment | Typical equity-bond correlation | Effect on 60/40 portfolio |
|---|---|---|
| Low, stable inflation, falling rates | Often negative | Bonds cushion equity falls |
| Rising rates driven by high inflation | Can turn positive | Both assets can fall together |
| Stable rates, moderate growth | Often low or mixed | Diversification benefit reduced but volatility still lower than all-equity |
What UK retirees might consider instead of abandoning the idea
Diversifying within the bond allocation
Rather than holding a single type of bond fund, some investors consider a mix of government and corporate bonds, and a mix of durations (short, medium and long), since shorter-duration bonds are typically less sensitive to interest rate changes than long-duration ones.
Considering inflation-linked bonds
Index-linked gilts, whose payments adjust with inflation, are sometimes discussed as a way to address the specific risk of an inflationary shock damaging both equities and conventional fixed-rate bonds simultaneously.
Broadening beyond a strict two-asset split
Some investors and multi-asset fund managers have explored adding small allocations to other diversifying assets, such as gold or absolute return strategies, though these bring their own characteristics and costs, discussed in more detail elsewhere.
Focusing on the underlying need, not just the ratio
The 60/40 split is a simplification of a deeper goal: balancing growth potential against a level of volatility the investor can tolerate, particularly important for a retiree drawing an income. The specific ratio matters less than ensuring the overall portfolio's expected volatility genuinely matches the retiree's capacity to withstand a downturn without needing to sell growth assets at a bad time.
How UK retirees might think about implementation specifically
For a UK retiree specifically, a few additional practical points are worth considering alongside the broader question of whether 60/40 remains sound in principle.
Gilts versus global bonds
UK government bonds (gilts) are a common building block for the bond portion of a UK retiree's portfolio, offering a sterling-denominated income stream that matches typical UK retirement spending needs without introducing currency risk. Some retirees also consider global bond funds, which spread interest rate risk across multiple countries rather than concentrating it in UK gilts alone, though this introduces currency exposure that may itself need managing, often through currency-hedged share classes of the same fund.
Index-linked gilts as a specific inflation consideration
Given that the specific episode of both equities and bonds falling together in the early 2020s was closely tied to an inflationary shock, some UK retirees and their advisers have given renewed attention to index-linked gilts, whose capital value and interest payments are adjusted in line with inflation, as a way of directly addressing this specific risk within the bond portion of a portfolio, rather than relying solely on conventional fixed-rate gilts.
The role of cash alongside 60/40
Many practical UK retirement portfolios do not strictly hold only equities and bonds — a separate cash buffer, covering a year or more of anticipated withdrawals, is often held alongside a broader 60/40-style allocation specifically to avoid needing to sell either equities or bonds at a poor moment, addressing sequencing risk directly rather than relying on the bond allocation alone to provide that cushion.
A worked example
Suppose a hypothetical retiree holds a £300,000 SIPP in drawdown, split 60/40 between a global equity fund and a UK government bond fund. In a year where both the equity fund falls 10% and the bond fund falls 8% (an illustrative, not predicted, scenario), the portfolio would fall from £300,000 to roughly £267,600 — a period where the bond allocation provided little of its traditional cushioning. Reviewing the situation, the retiree might consider whether their bond allocation is overly concentrated in long-duration bonds, which are typically more sensitive to rate changes, and whether shifting part of it to shorter-duration bonds or diversifying the mix could reduce this specific vulnerability in future, while accepting that no allocation eliminates the risk of a difficult year entirely.
Alternatives to a rigid two-asset split
Some UK retirees and advisers have responded to the recent questioning of 60/40 not by abandoning diversified multi-asset investing altogether, but by broadening the mix of diversifying assets used alongside, or in place of, a strict two-asset equity-bond split. This might include small allocations to gold or other diversifying assets, discussed in more detail elsewhere, or greater use of shorter-duration bonds specifically to reduce interest rate sensitivity. None of these approaches is a guaranteed solution to the underlying problem — that no combination of assets is immune to every possible economic environment — but broadening the toolkit beyond a fixed 60/40 ratio is one way some investors have chosen to respond to recent experience, while retaining the same underlying goal of balancing growth against volatility.
Learning from history without over-fitting to one episode
It is worth being cautious about drawing overly firm conclusions from a single difficult period for the 60/40 approach. Financial markets have experienced numerous distinct economic regimes across history — periods of high and low inflation, rising and falling rates, and varying correlation patterns between asset classes — and no single multi-year episode, however instructive, definitively proves that a long-established approach is now permanently broken. The more measured conclusion many portfolio commentators draw is that the 60/40 approach's historical reliability was itself partly a product of a specific multi-decade environment of generally falling interest rates, and that investors should hold their assumptions about future asset correlations with appropriate humility, revisiting them periodically rather than assuming past patterns will repeat indefinitely in either direction.
A final practical note
Whatever conclusion an individual retiree draws about the future reliability of a 60/40-style allocation, reviewing the portfolio's actual composition and behaviour periodically, rather than assuming it will always behave as the textbook description suggests, remains a sound habit regardless of which specific ratio or asset mix is ultimately chosen.
Key takeaways
- The 60/40 portfolio's reputation for safety rests on bonds historically cushioning equity market falls, particularly in low-inflation, falling-rate environments.
- The early 2020s saw periods where equities and bonds fell together, driven by rising interest rates in response to higher inflation.
- This does not make 60/40 obsolete, but it does mean the diversification benefit of bonds should not be assumed to be constant across all economic environments.
- Diversifying bond duration and type, and considering inflation-linked bonds, are approaches some investors use to address this specific risk.
- The underlying goal — matching portfolio volatility to a retiree's genuine capacity for loss — matters more than rigidly following any specific ratio.
- Always check current HMRC and FCA figures and allowances, as these change from tax year to tax year.