By Darian Macey, February 25 2026
For the past decade, ESG reporting has largely sat in sustainability teams and annual reports. That has now changed.
Under Australia’s new sustainability reporting regime, climate disclosures are being embedded into financial reporting. Large entities captured under Chapter 2M of the Corporations Act must now prepare sustainability reports aligned to AASB S2 (climate-related financial disclosures). ASIC’s regulatory guidance (RG280) makes clear that this is not voluntary narrative reporting – it is governed, reviewable, and moving toward assurance.
The important point for the Defence estate sector is this:
You do not need to be a reporting entity to be affected.
If your client is captured by the regime, they will need your data.
What is changing?
The regime is phased.
• The largest entities are already in.
• $200m+ entities are next.
• Thresholds progressively reduce.
For many Defence primes, major contractors and infrastructure service providers, this is now live.
AASB S2 requires disclosure of climate-related risks and metrics, including greenhouse gas emissions. That includes Scope 3 emissions – the emissions that occur across the value chain.
Scope 3 is the real shift.
It means reporting entities must account for emissions generated by suppliers, subcontractors, logistics, purchased goods and services.
In infrastructure and construction, that means:
• Embodied carbon in materials
• Fuel use in plant and equipment
• Electricity consumption
• Waste streams
• Transport and logistics
• Subcontractor emissions
If you are part of that supply chain, your data will be requested.
What does this mean for Defence estate contractors?
Right now, many Defence contractors are not directly captured by mandatory sustainability reporting.
But the primes are.
And the primes are contractually responsible for meeting reporting obligations.
The logical next step is that carbon data requirements will appear in:
• Tender documentation
• Head contract clauses
• Supplier onboarding processes
• Asset management reporting frameworks
• Ongoing maintenance and operations contracts
This is already happening in transport, utilities and major infrastructure.
Defence will not be immune.
The Defence estate audit has clarified what assets are staying and what is being optimised. For the assets that remain, performance, efficiency and lifecycle cost are now in focus. Carbon data increasingly intersects with that conversation.
Where most firms are exposed
Many firms still manage emissions reporting through:
• Generic calculators
• Government emission factor tables
• Spreadsheet-based estimates
• Consultant-prepared annual summaries
That approach worked when ESG was a narrative exercise.
It will not survive when CFOs, auditors and lenders are involved.
Under AASB S2, climate disclosures sit within the financial reporting ecosystem. CFOs now own the risk. That changes behaviour.
Finance teams will ask:
• Where does the data come from?
• Can it be reconciled to procurement and cost codes?
• Is it traceable?
• Can it withstand assurance?
If the answer is “we estimate once a year”, that will not be enough.
The emerging shift
What we are now seeing in the mid-market is the move toward finance-integrated ESG systems.
These platforms:
• Connect to ERP and procurement systems
• Link emissions to invoices and cost categories
• Attach emission factors at product level
• Integrate utility meter data
• Create audit trails
• Generate disclosures aligned to AASB S2
This is different from a standalone carbon calculator.
It embeds emissions into financial workflows.
For contractors and consultants supplying into Defence programs, that matters because:
• It reduces audit friction
• It supports tender responses
• It enables credible Scope 3 reporting
• It strengthens discussions with lenders and insurers
Some banks are already offering preferential pricing for borrowers who can demonstrate credible, data-backed transition metrics. Insurers are also starting to assess sustainability maturity in risk profiling.
Is Defence itself borrowing money? No.
But its suppliers are.
And the cost of capital flows through the supply chain.
What should Defence contractors do now?
- Understand whether your clients are captured by AASB S2.
- Expect Scope 3 data requests.
- Map where emissions data currently sits in your business.
- Identify gaps between sustainability reporting and financial systems.
- Prepare for more structured, auditable reporting.
This is not about ideology.
It is about regulatory change and commercial reality.
Software alone is not the solution. Operations matter more than reporting.
But reporting infrastructure will increasingly determine who looks credible in a tender room.
Where this goes next
Over the next 12–24 months, expect to see:
• Carbon data embedded in Defence estate contracts
• Greater focus on embodied carbon in design phases
• Increased scrutiny of energy performance in base operations
• More structured reporting expectations from primes
The firms that treat this early as a data and governance issue, rather than a marketing issue, will be better positioned.
For those exploring structured ESG reporting platforms, finance-integrated solutions such as Taxilla have recently entered the Australian market, targeting mid-market entities facing Scope 1, 2 and 3 reporting pressure.
We will continue to monitor how sustainability reporting requirements intersect with Defence estate procurement and asset management frameworks.
Author: Darian Macey
Darian is a former Engineering Officer with the RAE with tertiary qualifications in Engineering and Project Management. He is a leading practitioner within Australia's NSI sector with previous employment in Government, project management and building contractor organisations.
