Rising bond yields undermine diversification for retirees

Weaker protection and weaker returns

Prolonged periods of higher rates have, on paper, increased the appeal of bonds. After ten years of modest yields, ongoing inflation, expanding fiscal deficits and a surge in corporate issuance have driven yields to levels not seen for several years. Yet advisers serving retirees and those in transition to retirement find that these raised yields conceal a difficulty. Long-dated bonds have traditionally formed the “40” portion of a 60/40 mix, serving as the safety net when equity markets decline. Their performance hinges on interest-rate duration—how sensitive they are to rate movements—so that rising yields depress market prices and fixed-rate issues generate negative returns.

That protective function has now eroded. Research from RAM on Australian markets indicates that, beginning in 2016, the link between domestic bonds and equities switched from a negative to a positive correlation and has continued to strengthen, meaning the two asset classes are increasingly moving together. The cash flow available is real and worth securing. The challenge lies in the method of capture. In addition to the loss of diversification, long-dated bonds now expose portfolios to heightened duration risk as rates climb. Professionals must explore alternative options to keep the “40” fulfilling its intended role.

The concern extends beyond diversification. Throughout almost every interval in the past three decades, a straightforward strategy of “bank bills plus 3 percent” has outperformed the standard Australian bond index by roughly 1.95 percentage points annually, while exhibiting about one-sixth of the volatility. Consequently, many investors have seen their long-duration bond slice deliver weaker returns and a more erratic ride, while also forfeiting the defensive quality that originally justified its inclusion. Explaining this combination to income-seeking clients is challenging. The shift cannot be easily reversed because it stems from structural forces: ongoing global conflicts, geopolitical tension, and Australia’s own productivity and capacity limits all suggest that inflation will remain raised and more erratic than market participants anticipated during the 2010s.

The Reserve Bank kept the official cash rate at 4.35 percent in August, cautioning that price growth remains too high and indicating readiness to raise rates further if upside risks arise, while noting that inflation may not settle back to the centre of its target range until late 2027. Such a backdrop inherently penalises long-duration bonds and favours shorter-duration, floating-rate instruments. Recent budget measures add pressure on the growth side of portfolios: limits on negative gearing and the replacement of the 50 percent capital-gains tax discount with an inflation-adjusted approach starting 1 July 2027 increase the effective tax on the assets that comprise the “60”. Although equity risk itself has not shifted, the projected after-tax return has declined.

Modernising the defensive allocation

The solution does not involve discarding the 60/40 framework, nor does it call for chasing additional growth. Instead, it requires updating the “40” so that it regains sufficient diversification and defensive strength to perform its original purpose. RAM’s modelling demonstrates that shifting a portion of the conventional bond holding into Australian floating-rate credit could boost returns by approximately 1 to 1.5 percentage points per year while trimming volatility. Achieving higher regular income, reduced duration exposure and shallower drawdowns represents a superior outcome, contrasting sharply with the results most fixed-income products have been delivering.

Understanding the asset class

Recent strain on property-backed and development-focused funds makes advisers cautious about any investment labelled “private credit.” Yet the category encompasses a broad spectrum. There is a stark contrast between speculative property-development loans and a diversified pool of secured, investment-grade credit such as residential mortgage-backed securities, where cash flows adjust with the cash rate, the collateral is an existing, independently appraised asset rather than an unfinished project, and arrears and valuations are reported on a regular basis. The goal in rebuilding the “40” is not to inject excitement but to return to the plain-vanilla nature the historic “40” possessed, this time using assets that continue to act defensively when it matters most. For retirees, plainness is exactly the objective.