Oil's recent surge is rippling through global bond markets, and Australia and New Zealand are feeling the heat. Traders have pushed government bond yields in both countries to 15-year highs, and are now betting that the Reserve Bank of Australia (RBA) may have to raise interest rates again this month.
According to Reuters, markets are now pricing in a 90% chance that the RBA hikes its cash rate—currently at 4.35%—at its September 29th meeting. That's a sharp shift from just a few weeks ago, when many investors expected the central bank to hold steady or even start cutting rates.
Why oil matters for interest rates
The link between oil and interest rates might not be obvious at first, but it's a crucial one. Energy is a major input cost for almost everything—from manufacturing and transport to heating and electricity. When oil prices climb, businesses face higher costs, and those costs often get passed on to consumers in the form of higher prices.
That's why central banks watch oil prices closely. If energy costs keep rising, inflation can stay stubbornly high, making it harder for central banks to bring price growth back to their targets. In Australia and New Zealand, both central banks have been battling inflation that remains above their comfort zones, and a fresh oil-driven spike could undo some of their progress.
As a result, traders have quickly repriced the "policy path"—the expected future path of interest rates—in both countries. Short-dated bond yields, which are sensitive to near-term rate expectations, have climbed across Australia and New Zealand. Higher yields reflect the growing belief that rates will stay higher for longer, or even go up further.
What this means for investors
For everyday investors, the move in bond yields is a signal that the era of cheap money is well and truly over—and might not end as soon as hoped. If the RBA does hike later this month, it would be the first increase in over a year, and it would mark a reversal from the pause that many had expected.
Higher interest rates have a knock-on effect on a range of assets. For one, they make borrowing more expensive, which can weigh on housing markets and consumer spending. They also make bonds more attractive relative to stocks, as the risk-free return on government debt rises. That can pull money out of equities and into fixed income, potentially pressuring share prices.
For those with savings accounts or term deposits, higher rates are generally good news, as they mean better returns on cash. But for anyone with a mortgage or other variable-rate debt, the prospect of another hike is a direct hit to monthly budgets.
The situation in New Zealand is similar, with the RBNZ also facing the same inflationary pressures from higher energy costs. While the brief doesn't specify a rate decision date for the RBNZ, the market's reaction suggests investors are bracing for a longer period of restrictive policy across the Tasman.
Global context: oil and inflation
This isn't just an Australian or New Zealand story. Oil's jump is a global phenomenon, and it's already affecting rate expectations elsewhere. In the US, for example, hotter producer prices and $100 oil have revived bets on another Federal Reserve hike. Similarly, oil's move past $100 is splitting Latin American markets as investors await key US inflation data.
The upcoming US consumer price index (CPI) report is being closely watched, with expectations of a faster monthly rise as gas prices rebound. That data could set the tone for global rate expectations, including in Australia and New Zealand.
Central banks around the world are grappling with the same dilemma: how to tame inflation without choking off economic growth. The European Central Bank, for instance, raised rates to 2.5% earlier this year as inflation persisted, showing that the fight is far from over.
What to watch next
For investors, the key dates to watch are the RBA's September 29th meeting and any upcoming RBNZ decisions. If the RBA does hike, it will be a clear signal that the central bank is prioritising inflation control over economic support. If it holds, it could be seen as a sign that the oil-driven repricing was overdone.
Also worth watching is the trajectory of oil prices themselves. If the surge fades, so too might the pressure on central banks to act. But if oil stays elevated or climbs further, the "higher for longer" narrative could strengthen, with implications for bond yields, currencies, and equity markets across the region.
For now, the message from the bond market is clear: don't expect rate cuts anytime soon. In fact, the next move could be up.
