The world’s bond markets have begun moving in unison, and Australia is unlikely to remain insulated from the consequences.
Government bond yields have climbed sharply across the United States, Japan, Britain and Europe over the past week, sending a warning that reaches well beyond financial markets. For Australian borrowers, property owners and policymakers, the shift matters because long-term borrowing costs are rising at a time when the global economy is slowing rather than strengthening.
That is the contradiction drawing attention from macro strategist Dr Komal Sri-Kumar, president of Sri-Kumar Global Strategies. Ordinarily, weaker economic conditions encourage investors to seek the safety of government bonds, pushing yields lower. This time, investors are demanding higher returns to hold sovereign debt, suggesting concerns about inflation and fiscal risk now outweigh fears about slowing growth.
Australia is already feeling the effects. The yield on the Australian 10-year government bond reached 5.05 per cent on Thursday, its highest level in nine weeks and 0.69 percentage points above where it stood a year ago. The 30-year bond touched a record 5.57 per cent in March, and renewed pressure in global markets has again pushed long-term Australian borrowing costs higher.
Sri-Kumar identifies three forces driving the sell-off, each carrying consequences for Australia.
The first is the worsening conflict involving Iran. Despite repeated ceasefire announcements, hostilities have intensified. Iranian attacks on shipping through the Strait of Hormuz have continued, while Iran-backed Houthi rebels have expanded strikes near Bab-el-Mandeb, the narrow waterway linking the Red Sea with the Gulf of Aden. Together, those routes carry a large share of global oil exports.
The result has been a sharp rise in energy prices. Brent crude, trading near US$72 a barrel at the beginning of July, has climbed above US$100 within three weeks, an increase of about 40 per cent. For an energy-importing country such as Australia, those costs eventually flow into transport, manufacturing and household expenses.
The second concern is America’s deteriorating fiscal position. Defence spending is increasing alongside the conflict, while interest payments on government debt continue rising as older bonds mature and are refinanced at higher rates.
“The bond market has stopped waiting for central banks. As Dr Komal Sri-Kumar argues, investors are now delivering their own verdict on inflation, setting the long-term interest rates that increasingly shape mortgage costs and financial conditions.”
Sri-Kumar describes a “potentially dangerous cycle” in which larger budget deficits require more Treasury issuance, forcing governments to offer higher yields to attract buyers. Those higher yields then increase interest costs, leading to even more borrowing.
The numbers already reflect that pressure. The US 10-year Treasury yield climbed to 4.71 per cent on Thursday, its highest since the beginning of 2025. The 30-year Treasury reached 5.17 per cent, close to a five-year high. Germany’s 10-year bond yield rose to 3.21 per cent, the highest level in 15 years.
The third factor is renewed trade tension. The United States has imposed a 50 per cent tariff on Canadian goods from August, while tariffs of between 10 and 12.5 per cent on imports from 60 countries have already taken effect. President Donald Trump has also indicated further tariffs targeting the European Union.
Combined with higher oil prices, investors increasingly see inflation remaining elevated for longer than previously expected.
Sri-Kumar reserves particular criticism for the US Federal Reserve. Chairman Kevin Warsh, he writes, “has repeatedly acknowledged that inflation is too high, but has failed to offer a framework for bringing it down.” The bond market, he argues, has effectively taken over the task of tightening financial conditions. “If you will not deliver a verdict on inflation,” he writes, characterising the market’s message to Warsh, “we will — and we will set the interest rates that truly matter.”
That matters for Australia because the Reserve Bank enters its August meeting against an increasingly difficult international backdrop.
The RBA has already lifted the cash rate three times this year to 4.35 per cent. Another increase would add roughly $1,875 a year to repayments on a $750,000 variable-rate mortgage, on top of the estimated $5,600 already added during 2026.
Markets currently assign only a little better than a 50 per cent chance of another increase. Three of Australia’s four major banks believe rates have now peaked and expect cuts to begin during 2027.
Independent economist Saul Eslake remains focused on inflation. He has said the June quarter consumer price index, due on 30 July, will determine whether another increase is warranted. “If inflation comes in around 3 per cent to 3.25 per cent or lower, I’ll probably change my mind,” he said, referring to his expectation of another rate rise.
Even if the RBA holds steady, mortgage borrowers are not necessarily spared.
Long-term bond yields directly influence fixed mortgage rates because banks price those products off the bond market rather than the overnight cash rate. The investment team at Perpetual warned this week that “RBA rate risk looks under-priced”, suggesting financial markets may still be underestimating how the Middle East conflict could influence Australian inflation.
Property markets are now sitting at the centre of that debate.
A widely shared exchange between two well-known market commentators this week reflected sharply different views about Australia’s housing outlook.
Macro commentator The Great Martis argued Australia is sitting atop “one of the greatest euphoric property bubbles in history”, built on decades of incentives, low interest rates and the assumption that borrowing costs would remain near zero indefinitely.
Pointing to what he described as a technical breakout in Australia’s 30-year bond yield, he suggested yields could eventually reach 6.40 per cent. If that occurred, he argued, mortgage rates could rise to between 8.5 and 9 per cent. “The fake narrative of a housing shortage is about to flip to a glut of housing gripping Australia,” he wrote. “This won’t end quietly.”
Economist Stephen Koukoulas dismissed the prediction. “I’ve read this same rubbish for more than 35 years,” he wrote. “At the first hint of a minor cyclical price fall, the muppets dust off their work and change the date. They’re wrong this time too.”
There is evidence supporting parts of both arguments.
Koukoulas is correct that predictions of an imminent Australian housing collapse have repeatedly failed over several decades. Population growth has remained strong, housing supply has consistently lagged demand, and households have shown a remarkable willingness to absorb higher repayments rather than sell.
Yet today’s environment differs from many previous cycles.
Australia’s household debt-to-income ratio stands at about 190 per cent, among the highest in the OECD. Mortgage stress continues to spread. Roy Morgan estimates 421,725 households were experiencing mortgage stress in June, up 14 per cent over the quarter. Severe stress is increasingly appearing in affluent suburbs traditionally viewed as resilient.
Housing prices have also softened. Sydney values are down 2.1 per cent from their late-2025 peak, while Melbourne has fallen 2.9 per cent. Nationally, repayments on a new housing loan now consume about 45 per cent of household income.
The Great Martis’s projection of a 6.40 per cent 30-year bond yield remains an aggressive forecast. Yet the drivers identified by Sri-Kumar, higher oil prices, expanding fiscal deficits, renewed inflation and rising global bond yields, are already visible.
If Australian long-term yields continue moving towards 5.5 or even 6 per cent, fixed mortgage rates will rise regardless of whether the Reserve Bank changes the cash rate.
The debate over Australia’s housing shortage also deserves greater nuance than it often receives.
Strong migration has supported housing demand for years, yet affordability has deteriorated to the point where many aspiring homeowners, including growing numbers of Indian-Australian families, face a structural gap between household incomes and entry-level property prices.
Attention now turns to two closely timed events.
June quarter inflation figures will be released on 30 July, followed by the Reserve Bank board meeting on 4 and 5 August. Both arrive against a backdrop of global bond markets that are already repricing inflation and fiscal risk.
Sri-Kumar’s warning ultimately extends beyond Australia. His argument is that investors are no longer waiting for central banks to dictate the direction of interest rates. Instead, markets are responding directly to inflation, government borrowing and geopolitical instability.
Australian bond yields are moving as part of that global adjustment.
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