GUIDANCE FOR POLICY MAKERS: Policy Cores for Australia's Big Projects

Dead Reckoning Policy Brief #4

Dead Reckoning (10 May 2026) | ‘Why Big Builds Challenge Australia’ and ‘Exploring Why Australian Productivity Keeps Missing the Mark’ | Classification: UNCLASSIFIED | Orientation: Structural Reform, Productivity, Project Governance

1. Executive Summary

The cancellation of the Inland Rail northern extension—announced under a week before the Budget drops, after costs exploded from $8.4 billion in 2017 to over $45 billion—is not an anomaly; it is the predictable output of institutional machinery that has not changed in 35 years.

The 7% Real Discount Rate that governs Australian infrastructure assessment was set in 1989 and has not been formally updated since. Treasury’s own current guidance—its Australian Centre for Evaluation CBA Guide, last updated July 2025—confirms this rate remains the live requirement, with only a downward sensitivity check to 3% available. The Office of Impact Analysis opened a formal review of its discount rate guidance in July 2023. More than two years later, and one Budget later, no update has been published. “Fair share” political mandates guarantee scope creep on any project that survives assessment. Lowest-cost procurement rules exclude the sovereign SMEs needed to build industrial depth, and three decades of outsourcing have left the Commonwealth unable to challenge the assumptions of its own projects. These are not policy gaps. They are the architecture of repeated failure.

Treasurer Chalmers framed the 2026–27 Budget around a productivity package and national resilience. That framing is correct—the problem is real. But productivity investment flowing through unchanged institutional machinery will not produce different outcomes than every prior round of productivity spending. The Budget’s structural test is not how much it invests, but whether it reforms the frameworks that determine whether investment delivers.

The Budget is here. The 90-day window that follows is the implementation period that determines whether it is a genuine structural inflection point or another round of announced spending with predictable delivery failure. This brief identifies who needs to act, on what, and by when.

2. Key Takeaways

The 7% Real Discount Rate is Australia’s self-imposed productivity trap—and the government’s own review of it has been stalled for over two years.

Set in 1989 and confirmed as the live requirement in Treasury’s July 2025 ACE CBA guidance, the rate reduces a $1 million benefit 30 years out to $131,000 in present value today. The Grattan Institute finds that at 4%, major projects including Inland Rail and Melbourne Metro show benefits outweighing costs by a factor of two or more—projects that appear barely worthwhile at 7%. The Office of Impact Analysis opened a formal review of its discount rate guidance in July 2023. No update has been published. Meanwhile, peer countries have moved: the UK to 3.5% (and 1.5% for long-term strategic outcomes); New Zealand to 2% for long-term social and environmental policies; the US to 2% as its regulatory default in 2023; the EU to 3%. Advanced economies are converging in the 1–4% range. Australia, at 7% for 37 years, is an outlier—and the OIA review that was meant to address this has been running since mid-2023 with nothing to show for it.

“Fair share” politics is an execution killer, not a governance principle.

Regional spread of infrastructure to secure votes, negotiated in back-rooms rather than designed for effect, is the consistent precursor to cost blowout in Australian megaprojects. The NBN’s prioritised rollout in regional areas—used to secure the 2010 minority government—diverted the project from high-impact corridors before it was technically coherent. Inland Rail’s expansion from a focused freight corridor to a multi-electorate jobs commitment preceded the cost explosion that produced last week’s partial cancellation. The government then committed $3.8 billion to Melbourne’s Suburban Rail Loop two days later. This is not fiscal correction. It is the same pathology migrating to the next project. It is the rational output of incentive structures that have never been redesigned.

Procurement culture and hollowed public sector capacity are compounding the failure.

Lowest-cost bundling in Commonwealth panel contracts structurally excludes Australian SMEs while concentrating government work with foreign primes and large consultancies. Three decades of outsourcing strategic thinking, project scoping, and delivery design have left agencies without the internal expertise needed to challenge assumptions, enforce quality standards, or identify when a project is failing before the cost blowout becomes public. Snowy Hydro 2.0—originally estimated at $2 billion, now above $12 billion in direct construction costs—confirms the pattern is systemic, not project-specific. More funding for programs assessed and delivered by this institutional machinery will not improve productivity outcomes. The machinery itself requires redesign.

3. Priority and 90-Day implementation Plan

Actions must be followed through on either side of the Budget to address ongoing loss of value in projects, even as commitments and projects themselves are continued, put forward or cancelled.

4. Strategic Questions

These questions are designed for committee hearings, Senate Estimates, internal briefings, or Budget discussions. They expose optimism bias, hidden opportunity costs, and institutional incoherence.