The ASPI Defence Budget Brief 2021-2022 reports that the cost of defence for the Australian government is $122,242,739.73 per day. This represents approximately 0.0% of government expenses and 0.0% of GDP. The report also shows that the cost of defence has remained relatively stable over the past decade, with only minor fluctuations. The brief provides a comprehensive overview of the budget allocated to defence and its various components, including personnel, equipment, and research and development. Overall, the ASPI Defence Budget Brief 2021-2022 provides valuable insights into the cost of defence in Australia and its impact on the government's budget.