Answered in full
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How long does a first report take?
Short answer
How long a first climate report takes is set by how fast you can produce a full year of source documents, not by the standard. There is no published Australian benchmark. Build the calendar backwards from your lodgement date, allowing for assurance after year end, and settle your boundary before year end.
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All questions
The answer to this question has no right or wrong answer. Nothing in AASB S2 or in the Australian assurance standards sets a duration. No credible published Australian benchmark exists for how long a first-year engagement runs, which is why you will see week counts quoted confidently in the market with nothing behind them. What does exist is a fixed end date and a variable amount of work in front of it. Your lodgement date is set by statute and does not move. The coordination is critical and this can either be done by you or you can outsource this activity with the right provider.
Start from the end
Your lodgement date comes from the group threshold you fall under and the date your auditors normally submit your financials to ASIC. Two things about the thresholds that impact your deadline. The first is that your group’s start date is the date on or after which your first captured financial year must commence, which is not a due date and is routinely misread as one. The second is that whether you are a disclosing entity, a registered scheme or a registrable superannuation entity adds a full month, because these entities lodge three months after year end and everyone else lodges in four.
What actually sets the duration
Three things, in the following order.
A full year of source documents
This is the most difficult bit and it is the one no provider can shorten for you. Twelve months of electricity invoices across every site, fuel card statements, gas bills, refrigerant service records etc. Some of it sits in your own systems and comes out in a consolidated report. Some of it has to be requested from a retailer, a landlord or a contractor who has no obligation to you and no reason to hurry. Third-party data has lead times measured in weeks, sometimes repeated weeks when the first extract comes back in the wrong format or is missing critical bits of data. If you start requesting after year end, you have put the most intensive and slowest item last.
A settled organisational boundary
Which entities and facilities are in, on what consolidation basis, and who approved it. A boundary not defined at year end will likely delay or break the first-year schedule, because every downstream step relies on this criteria. You cannot close the data for a site you have not decided is in scope, and you cannot write a basis of preparation around a decision nobody has made. Settle it before year end, in writing, dated, with an approver.
Assurance sitting after your year end, inside a fixed window
The assurance engagement can only start once the period it covers has ended, and it must finish before lodgement. Everything else is compressed by it. Elapsed time inside the engagement is driven by how fast you answer queries rather than by the practitioner’s fieldwork, which is a smaller part of it than people expect. If your working papers are complete before fieldwork starts, it runs to plan. If they are not, it stalls while evidence is assembled, and it stalls inside the one window that cannot be extended.
The sequence, and what breaks each step
Step
When it sits
What drives the duration
What breaks it
Confirm capture, group and lodgement date
As early as possible, well before year end
An hour of work once the consolidated numbers are to hand
Testing against last year’s actuals rather than the forecast year-end position
Settle the organisational boundary
Before year end
How many joint ventures, leases, franchises and recent acquisitions you have
Leaving the edge cases undecided, so the decision lands after year end
Write the basis of preparation
Before year end
Methodology and factor choices, documented once
Treating it as a write-up at the end rather than a decision at the start
Collect source documents
Starts before year end, closes after it
Third-party lead times, number of sites, whether the data has ever been pulled before
Requesting from retailers, landlords and contractors only after year end
Build the inventory and the working papers
After year end, before fieldwork
Volume of sources and how retrievable the documents already were
Hard-coded totals with no traceable source; a file nobody but the preparer can rebuild
Assurance fieldwork and query clearance
After the working papers are complete
How fast you answer queries, and the quality of the file
An incomplete file, which turns queries into evidence-gathering inside a fixed window
Board approval and the directors’ declaration
After the conclusion is settled
Your board calendar, not the reporting process
A board cycle nobody checked against the lodgement date
Lodge
Statutory date
Nothing. It is fixed
Assuming the sustainability report can be lodged after the financial report. It cannot
What you can compress
The working papers, the basis of preparation and the disclosure drafting are technical execution and they respond to resourcing. Adding capable people to that half genuinely shortens it, which is why it is the half that can be outsourced. Query clearance also compresses, if the file was complete before fieldwork started, because then a query is a retrieval rather than an investigation.
What you cannot compress
Four things, and recognising them early is critical. Your lodgement date does not move. Third-party source documents arrive when the third party sends them. The assurance engagement should not start before your year end. And governance evidence technically cannot be created retrospectively: if your report says the audit and risk committee oversees climate-related risks, there must be a minute dated inside the reporting period showing it happened. That is the one item where starting late is not a delay but a permanent gap in the file.
What to do now
Confirm your first reporting period and lodgement date and work the calendar backwards from it. Settle the boundary and get it approved early. Start requesting third-party source documents now, because it is the longest-lead item on the list. Put climate on a committee agenda inside the reporting period, with a paper. If you do those four things, the remainder is a resourcing question rather than a deadline question, and a resourcing question is one you can still solve in the last quarter.
Where Carbonhalo fits
Carbonhalo prepares mandatory climate reports under AASB S2 for Australian businesses filing for the first time, on a fixed-price, done-for-you basis: no new hire, no system integration, and no subject-matter knowledge required on your side. Carbonhalo does not provide assurance.
Terms used in this answer
Related questions answered in full
Sources
1
When and how to lodge your sustainability report
ASIC
The lodgement deadline and the three-month versus four-month limbs. Supports the fixed end date the whole calendar is built backwards from. Corroborated by Corporations Act s 319.
2
ASSA 5000 General Requirements for Sustainability Assurance Engagements, read with ASSA 5010
AUASB, approved 28 January 2025, amended to July 2025
Supports the position that the governing standard sets requirements and a phasing but no engagement duration, and that assurance sits between year end and lodgement.
3
AASB S2 Climate-related Disclosures
AASB, September 2024
Supports the boundary, basis of preparation and evidence requirements that set the work in front of the deadline, and the absence of any prescribed timeline.
All sources fetched or searched 25 August 2026.