Australia's 2026–27 Defence Budget commits the Commonwealth to spending approximately $181.9 million on defence every day. The headline number is sobering. The composition is more so.
Australia's strategic environment has not eased since last year's The cost of Defence. China continues to lift its military investment at a pace few of our regional partners can match. Russia's war in Ukraine has not ended. Conflict in the Middle East has flared and subsided and flared again. The United States continues to recalibrate the terms of its alliances. Rearmament is underway in Europe, the Middle East and the Indo-Pacific. Australia is part of that rearmament. Others are moving faster.
The Treasurer placed defence inside the Budget's 'Resilience and reform' pillar, alongside fuel resilience, critical minerals and the Future Made in Australia agenda. The framing is right. Economic security, economic resilience and national security are now one and the same. On the policy architecture for that broader security pillar, the Government should be acknowledged and praised. The 2026 National Defence Strategy (NDS) and the updated Integrated Investment Program (IIP) describe a force built for the Strategy of Denial, anchored to AUKUS Pillar 1, and funded across the decade at $887 billion. That is one of the largest peacetime defence investment commitments in Australian history. On the appropriation behind it, the work has barely begun.
The cost of Defence: ASPI Defence budget brief 2026–2027 examines the Government's progress with, and spending on, the 2026 NDS and IIP. It asks the cent on the dollar arithmetic question. Of every dollar in the $53 billion of additional decade investment the Government announced alongside the NDS in April, only about four cents is actually appropriated in this Budget. About nine cents is 'promised' over the forward estimates. About fifty-four cents is 'promised' over the decade out-years. About thirty-three cents is tied to the Contingency Reserve and to 'alternative financing' through mechanisms the Budget Papers do not specify. Only the Budget year represents actual cash to be appropriated to Defence. The rest is a promise. The historical record, the 2009 Defending Australia in the Asia Pacific Century White Paper among other examples, is that promises of this kind have a tendency to be revised down by subsequent Budgets.
The shape of the 2026–27 Budget signals the choice the Government has made. Workforce funding is up by $815 million. Acquisition funding is down by $724 million. Sustainment is down by $283 million. The whole-of-government defence spend falls in nominal terms by $799 million before back-loaded growth begins in 2027–28.
Defence is buying a future force, and it is doing so by accepting that the ADF will be able to do less today. Fewer spare parts in stockholdings. Less training intensity. Less platform availability. Less ammunition consumption. Less time at sea, in the air and in the field. The 2026 NDS asks the present force to carry the deterrence load through the optimal pathway window to the 2030s and to carry it with less.
Behind the headline numbers sits a structural feature this year's report assesses in detail. Across the 12 capability investment priorities (CIPs) that organise the IIP, typically 75 to 80 per cent of the next decade's investment remains unapproved and back-loaded into the same decade the NDS itself identifies as Australia's window of greatest strategic risk. This is kicking the can down the road.
On the question of how much is being committed, the government has suggested that trajectory reaches approximately 2.5 per cent of GDP by 2033–34 on the traditional defence appropriation measure, and approximately 3.0 per cent on Defence's NATO comparable methodology. The recipe the Government is using to derive that latter figure is not transparently disclosed.
The Government has chosen the NATO comparator to align with allies. On that basis, the gap to the 3.5 per cent NATO core defence floor is real, and is not closed by the stated commitment. Australia continues to fall behind the pace. Our rank in the regional defence spending league, having held inside the top five at the start of the decade, now sits outside it. On current growth rates, we will not regain that position by 2035.
If the promises of the 2026 NDS and IIP are delivered, the principal adequacy gap is no longer money. It is the workforce, the industrial base, the integration across capabilities and the institutional follow through that the decade ahead requires. Submariners, pilots, cyber operators, engineers and acquisition staff are now the binding constraints across almost every major capability stream. Without them, the platforms cannot be operated, the programs cannot be delivered and the strategic concept cannot be sustained. To the Government's credit, the workforce funding line grew in the 2026–27 Budget, though it is the only major funding line to do so. But money alone will not relax these constraints. Australia also remains heavily dependent on US production and technology across key capability streams. Greater emphasis on domestic industry, sovereign production and technology transfer will be needed to reduce long term strategic vulnerability. On AUKUS, Pillar 1 has become its own funding centre of gravity, and risks crowding out the connective capabilities needed to deliver an integrated force.
Three things follow. First, present day preparedness must be funded. The sustainment and operating reductions are buying a future force at a cost to the current one, and that cost should be acknowledged and bounded. Second, the Defence Delivery Reforms scheduled for 2027–28 must be pushed forward with full institutional weight. Lifting the conversion rate from unapproved to contracted projects is the central reform task. The Defence Delivery Agency and the National Armaments Director cannot start that task soon enough. Third, the Government should publish the formula it is using to derive its NATO comparable funding figure. The story Australia is telling allies is weaker than the story Australia can actually tell.
ASPI's charter requires us to inform and nurture public debate on defence and security and to provide alternative advice to government. The cost of Defence does so objectively, sharing the Government's and Defence's aim of strengthening Australia's long term security, prosperity and sovereignty. We do not expect every reader to agree with our positions. We welcome debate and disagreement, in the hope that Australia will be stronger, more prepared and more resilient for the challenges we confront now and will face in the decade ahead.
