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Treasury has revised future spending pressures up by $47.8 billion, driven by faster growth in major social programs.
The OECD has warned that universal subsidies risk worsening long-term budget sustainability, and are often used by higher-income households.
Spending now sits near 26.9 per cent of GDP, with deficits forecast to persist for years.
“Every government is entitled to their spending priorities, but with that comes a responsibility to pay for it,” said Coalition treasury spokesman Ted O’Brien.
Recent blowouts include higher-than-expected costs in the NDIS, childcare subsidies, school funding and energy-related programs, alongside policy choices that expanded eligibility.