ASSA 5000 · ASSA 5010
AASB S2 · IFRS S2
Group 1 · 2 · 3
Climate disclosures prepared for assurance.
More than 1,500 businesses are facing mandatory reporting this year, assurance capacity will be under increasing pressure. We prepare, structured and traceable client files designed to make it easy for your firm to review and audit.
Hitting the Australian economy
Australian businesses facing mandatory reporting this year
Assurance capacity is becoming a critical constraint
Assurance firms use Carbonhalo to reduce review time and streamline engagements
Prepared under AASB S2 · GHG Protocol Corporate Standard
Why audit and assurance teams use us
Spend your time on judgement, not evidence chasing.
A poorly prepared climate file can turn assurance into an exercise in chasing evidence, reconstructing calculations and going back through the client’s accounts. Carbonhalo prepares the evidence trail before the file reaches your team.
Built for assurance from day one
Working papers, methodology, evidence and disclosure mapping are built as the numbers are prepared, so your team isn't reconstructing the file after the fact.
Traceable from source to disclosure
Every material figure has a clear trail from source document through activity data, emission factor and calculation to the reported result, with reconciliation to the relevant general ledger.
Questions come to us, not the client
We answer the questions about the numbers we prepared. Your team doesn't have to spend time coordinating between the client, finance team and whoever prepared the calculations.
Preparation and assurance stay separate
Carbonhalo prepares. You assure. The roles remain clearly separated, giving assurance firms a preparation partner they can refer clients to without taking on the preparation work themselves.
Human expertise. Better technology. Cleaner assurance.
The expertise to prepare it. The technology to prove it.
We are not selling your clients a transformation project. We just prepare the disclosures properly. Experienced people do the work, with technology that keeps the process efficient, the data traceable and the cost under control.
- Experts behind every disclosure: every disclosure is prepared and reviewed by people who understand climate reporting, accounting and the standards that underpin it. Technology supports the work; it doesn't replace professional judgement.
- Traceability built in from the start: our technology captures source data, methodology, assumptions and evidence as the work happens. Gaps are identified early, so your team receives a file with a clear evidence trail rather than one that needs to be reconstructed during assurance.
- One team. One file. Start to finish. from baseline measurement through to the completed disclosure, one Carbonhalo team owns the preparation. No stitching together outputs from multiple providers, methodologies or sets of assumptions for your team to reconcile.
- Clear separation: Carbonhalo prepares. You assure. We do not provide assurance or form an assurance opinion. We prepare the underlying information and supporting evidence so your team can independently perform its assurance work.
working paper / scope 1 / fleet diesel
source
BP fuel card statement, FY26 Q3
activity
48,120 L diesel oil
factor
2.70 kg CO₂-e / L NGER Sch.1 Pt.2
calculation
48,120 × 2.70 / 1000
result
129.9 tCO₂e
evidence
INV-40118.pdf · reconciled to GL 6120
Every figure ties back to a source document
One working paper, one figure, six fields. This is the unit your review is built on. It exists for every number in the inventory before you ask for it.
What the reviewer receives
Nine documents. One traceable evidence file.
AASB S2 reporting creates a significant body of evidence. We build that evidence as the work progresses, so key judgements, figures and disclosures can be traced back to their source. Each document has a clear purpose and gives the reviewer something tangible to assess.
The document
What it covers
01 · Governance terms of reference
Documents the governance body’s role, responsibilities and oversight of climate-related matters, providing evidence for the governance disclosures.
02 · Industry and peer analysis
Sets out relevant sector risks, peer practices and reporting maturity, providing context for the entity’s identification and assessment of climate-related risks and opportunities.
03 · Risk and opportunity register
A full sweep of climate risks and opportunities, prioritised and assessed. The register shows the process, not just the conclusion, so the completeness assertion is testable.
04 · Scenario and resilience analysis
Records the climate-related risks and opportunities identified, including their assessment, prioritisation and status. It shows how the conclusions were reached, not just what the conclusions are.
05 · Financial impact assessment
Links material climate-related risks and opportunities to their potential financial effects, with the basis and assumptions used for each assessment documented.
06 · Materiality memorandum
Documents the basis for determining what is material and therefore included in the disclosure. It provides a clear record of the judgements and thresholds applied.
07 · Emissions inventory report
Provides the underlying Scope 1, Scope 2 and Scope 3 emissions calculations, with sources, emission factors and evidence references traced through to the reported figures.
08 · Resolutions
Records the formal decisions and approvals supporting key determinations and disclosures, providing evidence that they were considered and adopted by the appropriate governing body.
09 · Sustainability report
The final board-ready disclosure, supported by a disclosure index mapping the reported content to the relevant AASB S2 requirements.
Two groups, overlapping needs
Auditors and assurance providers are different readers.
The evidence they need overlaps significantly. The context they work in does not. We prepare the working papers for both, without blurring the distinction.
Auditors
Registered company auditors providing the assurance opinion alongside the financial report.
You are working within an established financial audit process, with climate information that needs to reconcile to the underlying financial and operational records.
You need clear evidence of where the numbers came from, how they were calculated, and how the reported figures can be independently re-performed.
We provide the reconciliation, source evidence and calculation trail to make that process straightforward.
Assurance providers
Practitioners performing sustainability assurance under ASAE 5000.
You may be providing limited assurance over specific disclosures or metrics, often without the same financial audit history or existing audit file.
You need the sustainability work to stand on its own, with a clear boundary, documented methodology, supporting evidence and a direct link between the requirements and the disclosures.
We provide the boundary memo, methodology, evidence trail and disclosure index needed to work through the engagement efficiently.
What we need from you
Four things upfront. A smoother assurance process.
Give us these four inputs early and we build the file around your assurance approach from day one, rather than adapting it at the end.
01 · Client and reporting year
Which reporting group the client falls into, where the client is in their AASB S2 reporting cycle and the financial year they operate under.
02 · Materiality threshold
The quantitative materiality threshold and any qualitative factors you will apply. We use this to align the depth of our calculations, evidence and documentation with the level of testing expected.
03 · Timetable
Your interim and final fieldwork dates, and when the file needs to be complete. We build backwards from your dates, not the client's.
04 · Evidence-format preferences
How you want working papers delivered, how you want them indexed, and any firm-specific referencing convention. We match your file, not ours.
How the assurance handover runs
Built in three streams. Handed over as one complete file.
The work is completed across three connected streams, delivered in parallel. At handover, you receive a complete, traceable file ready for your assurance process.
We stay involved after handover. If a question comes up, you can come directly to the people who prepared the numbers and disclosures, not through the client’s finance team.
Stream 01
Emissions baseline
Organisational boundary set and documented, data sources mapped and the reporting year fixed, then Scope 1, Scope 2 and Scope 3 measured from the client’s own records. The boundary memo is written here, not reverse-engineered later.
Stream 02
Climate disclosures
Documents and disclosures created against the four AASB S2 pillars, with key statements and requirements cross-referenced to the evidence that supports them.
Stream 03
Sustainability report
The complete sustainability report is assembled, reviewed and cross-referenced, then issued to the client for board approval with the disclosure index attached.
Handover
Assurance support
Working papers handed over in the format you asked for, and your questions answered directly by us rather than relayed through the client’s finance team. We prepare and explain.
“We are highly complimentary of the quality, completeness and professionalism of Carbonhalo’s climate reporting work. The standard of documentation significantly assists audit.”
Built for assurance
Reporting designed around the assurance process.
Carbonhalo makes your assurance work easier and faster, giving your assurance team more capacity across engagements.
Australian businesses supported
AASB S2 compliant output
industries, heavy industry to retail
audit firms refer clients to us
Which of your clients are captured
Find the group, then the deadline.
Meet two of the three tests and the entity is captured. Consolidated groups apply the tests at group level.
Group
Revenue
Gross assets
Employees
First report
Group 1
> $500m
> $1b
> 500
30 Jun 2026
Group 2
> $200m
> $500m
> 250
30 Jun 2027
Group 3
> $50m
> $25m
> 100
30 Jun 2028
For partners and engagement leaders
Start with a partner-level conversation.
It takes 30 minutes. We’ll show you a full report, complete with working papers, explain exactly what we do, and set up a way for you to refer clients that your cant prepare for.