Australia 10-Year Yields surge to a 15-year high, here’s why

Australia's 10-year government bond yield surged to a 15-year high of 5.223% on Wednesday, spurred by impressive second-quarter GDP growth and mounting hawkish signals from the Reserve Bank of Australia (RBA). The economy expanded by 0.4% quarter-on-quarter in Q2, surpassing expectations, while annual growth accelerated to 2.1% compared to forecasts of 1.8%.

These robust figures suggest the economy remains resilient despite the RBA's efforts to temper demand. Following the GDP release, the probability of a fourth rate hike at the September meeting rose to 57%, up from 48%, with a November hike now fully priced in. The GDP catalyst built upon weeks of hawkish pressures. While July data showed headline inflation easing to 3.5%, trimmed mean inflation remained high at 3.6%, well above the RBA's 2%-3% target.

Globally, escalating U.S.–Iran tensions and surging oil prices have heightened inflation risks, pushing yields higher in tandem. Japanese, British, and US government bond yields also climbed, reflecting global concerns about debt and inflation. The S&P/ASX 200 index traded lower on the day, mirroring a risk-off sentiment as rising yields pressured rate-sensitive equities.

This convergence of a strong domestic GDP beat, sticky core inflation, hawkish RBA adjustments, and a global bond selloff fueled by geopolitical oil-price shocks created a multi-layered catalyst for today's yield surge. The likelihood of an additional RBA increase in Q1 2027 climbed to 82% from 62%, indicating markets now anticipate a prolonged tightening cycle, sustaining upward pressure on Australian yields beyond today's session.