Australian Treasurer Jim Chalmers is on track to oversee the highest-taxing government in Australian history, with the Final Budget Outcome for 2025-26 showing tax receipts reached 24.1 per cent of GDP—nearly matching the modern record of 24.2 per cent set during the Howard government's mining boom. This represents a significant shift in tax levels, exceeding both the May budget forecast of 23.6 per cent and the 23.9 per cent cap established by former Coalition finance minister Mathias Cormann.

The stronger-than-expected budget position was driven primarily by higher-than-anticipated superannuation and investor income, rather than wage growth or commodity prices. Key figures reveal the budget deficit came in at $22.3 billion—$6 billion better than the $28.3 billion forecast in May—whilst government spending remains elevated at 26.9 per cent of GDP, the highest level outside the pandemic in four decades. Chalmers noted that the budget has improved by $230 billion since Labor took office, with debt $197 billion lower than projected at the election, though Opposition Leader Angus Taylor countered that the figures demonstrate "more spending, more taxation, more debt" alongside rising interest rate expectations.