Sunita Somvanshi
Australian motorists filling up at the bowser and mortgage holders checking their repayment apps face a difficult week after the Australian Bureau of Statistics confirmed inflation accelerated to 4.3% in the September quarter—beating forecasts and arriving just six days before the Reserve Bank of Australia’s Melbourne Cup Day rate meeting on November 3. The data set off immediate speculation about a fifth rate hike in 2026 and renewed pressure on Treasurer Jim Chalmers over petrol tax relief.
The ABS September Quarter 2026 Consumer Price Index rose 4.3% annually, above the 4.2% consensus forecast. Treasurer Jim Chalmers ruled out reintroducing a fuel excise discount on October 28, confirming “it is not our intention” to cut the rate again. Australia’s full excise rate of 53.7 cents per litre for petrol and diesel has applied since August 3, 2026, when temporary federal relief expired. The RBA Governor has indicated that further action may be needed to bring inflation to heel. Global oil prices are running at a six-month high amid Middle East conflict.
Australian households face a double hit over the next seven days. First, at the bowser, you are paying the full 53.7 cents per litre in fuel excise with zero federal relief on the horizon—adding significantly more tax to every fill-up compared to when temporary relief applied earlier this year. Second, today’s 4.3% inflation print makes a fifth 2026 RBA rate hike on Melbourne Cup Day (November 3) a live threat, which would add roughly $90–$115 per month to a $600,000 variable mortgage.
From Diesel Shocks to Gaming Consoles: What Is Driving the 4.3% Surge
Australia’s fuel exposure sits at the centre of the September inflation story. Middle East supply disruptions have pushed global oil prices higher, contributing to Australia’s elevated imported fuel costs. Prices for non-mortgage discretionary categories have also tracked upward sharply, including recreation services, entertainment subscriptions, and gaming hardware. Consumers can compare running cost differences in Australian EV and hybrid running cost comparisons or review available solar battery rebates and National Energy Performance schemes before the February price cycle. The RBA interest rate history for 2026 provides context on the five-hike trajectory now on the table.
The automatic CPI indexation mechanism built into Australian excise law means today’s 4.3% September reading does more than measure pain—it sets the next tax rise. Under ATO and Australian Border Force tariff rules, petrol and diesel excise is indexed twice a year using two consecutive quarterly CPI figures without a parliamentary vote. The September quarterly figure is one of two inputs used to set the February 2027 excise rate, which adjusts automatically regardless of what Chalmers says between now and then.
*What is the current fuel excise rate in Australia in 2026?* Australia’s fuel excise rate for petrol and diesel is 53.7 cents per litre. The rate returned to its full indexed level on August 3, 2026, after temporary federal relief expired. Treasurer Jim Chalmers confirmed on October 28 that the government does not intend to reintroduce fuel tax discounts despite 4.3% inflation.
*Will the RBA raise interest rates on Melbourne Cup Day 2026?* The RBA board meets on November 3. Following the 4.3% September CPI print, a fifth rate rise in 2026 is considered a live possibility, though not certain. A rate increase would add roughly $90–$115 per month to a $600,000 variable-rate mortgage.
*Why is Australian inflation rising again in October 2026?* The main drivers of the September 4.3% print are record-high global oil prices inflating Australia’s imported fuel costs, continued services inflation in housing and insurance, and rising prices in discretionary categories including recreation and gaming. The CPI result exceeded forecasts of 4.2%.
The RBA’s Melbourne Cup Day decision on November 3 will determine whether Australian borrowers face a further rate increase or a pause. Any shift in the current 53.7 cents per litre fuel excise—up or down—requires either a parliamentary vote or automatic CPI re-indexation in February 2027. Check back for updates after Tuesday’s decision.
