I get asked some version of this question by two completely different types of clients.
A property director asks it because they have to report under the newly established Australian Sustainability Reporting Standard (ASRS).
A grazier asks it because a carbon project developer showed up at their gate talking about a new income stream.
They are both asking about the same thing…
Carbon accounting is the practice of measuring, recording and reporting greenhouse gas emissions using a consistent method, the same way financial accounting measures money. A company uses it to track what it emits. A landholder can use the same discipline to measure what their land stores or removes from the atmosphere instead. This guide walks through both, where each one is required or rewarded in Australia, and how the two increasingly connect.
Key takeaways
- It’s not new: Australia has required large emitters to measure and report their emissions since 2007. Mandatory climate disclosure under ASRS adds more requirements to it.
- Same discipline, two directions: Corporates account for emissions to manage and reduce them. Landholders can account for carbon storage to earn credits from it.
- It underpins ASRS reporting: Your AASB S2 disclosure draws directly on your carbon accounting for the metrics and targets pillar, so the quality of that data matters.
- For agribusiness, there is a specific model: FullCAM, the government’s Full Carbon Accounting Model, is what turns soil and vegetation carbon into an Australian Carbon Credit Unit.
What does carbon accounting actually mean?
At its core, carbon accounting means converting activity data, fuel burned, electricity used, land cleared or regenerated, into a standardised measure of greenhouse gas impact, usually tonnes of CO2 equivalent. The internationally recognised method for doing this at a corporate level is the GHG Protocol Corporate Standard, which splits emissions into three scopes.
| Scope | What it covers | Example |
|---|---|---|
| Scope 1 | Direct emissions from sources you own or control | Diesel burned in your own trucks or generators |
| Scope 2 | Indirect emissions from purchased energy | Electricity drawn from the grid |
| Scope 3 | Indirect emissions across your value chain | Emissions from your suppliers, your logistics partners, or the disposal of what you sell |
Scope 3 is usually the hardest to pin down and the biggest number by far for most businesses, which is why it’s become such a common thread in supply chain conversations right now.
Where carbon accounting shows up in Australia
Carbon accounting isn’t tied to a single piece of legislation. It sits underneath a few different frameworks, each using it for a different purpose.
The NGER scheme
Since the National Greenhouse and Energy Reporting Act 2007, large emitters have had to measure and report their emissions annually to the Clean Energy Regulator. Any controlling corporation emitting 50,000 tonnes CO2-e or more (or a single facility over 25,000 tonnes) is caught. Roughly 800 to 900 entities are on that register in a given year, and it’s the oldest and most established piece of mandatory carbon accounting in the country.
ASRS climate reporting
Mandatory climate disclosure under AASB S2 builds on the same underlying data, but places it inside your annual financial statements, alongside a forward-looking narrative on governance, strategy and risk. It’s phased in across Group 1, 2 and 3 reporters by size.
The Safeguard Mechanism
Around 215 to 220 of Australia’s largest industrial facilities carry a declining emissions cap and have to buy credits if they exceed it. This is one of the reasons demand for ACCUs from carbon farming projects has grown.
The ACCU scheme
On the land side, carbon accounting is what verifies how much carbon a project has stored or avoided releasing, which is what earns an Australian Carbon Credit Unit.
How it connects to your ASRS report
We cover the four pillars of AASB S2 disclosure in our ASRS guide: governance, strategy, risk management, and metrics and targets. The metrics and targets pillar is where your carbon accounting sits, it’s the actual emissions data an auditor tests against source records rather than a narrative they assess for completeness.
Gaps in it tend to surface once the auditor starts asking where a number came from. We’ve written more on the commercial upside of getting this right in how ESG and ASRS reporting can unlock commercial value.
The agribusiness angle: carbon accounting in reverse
For a landholder, carbon accounting works the other way around. Instead of measuring emissions, it measures how much carbon your soil, pastures or trees have stored, or stopped from being released. Run through an approved method and verified against a baseline, that stored carbon becomes an Australian Carbon Credit Unit, one credit per tonne of CO2 equivalent.
The tool that does the heavy lifting here is called FullCAM, short for Full Carbon Accounting Model. It’s built and maintained by the federal government, used both for Australia’s official land-sector greenhouse accounts and to estimate how much carbon a given vegetation or soil project is likely to sequester.
The catch is additionality. You don’t get credited for carbon storage you were already achieving through normal farming practice. You have to demonstrate the project stores more carbon than your documented baseline, and most projects lock you into a 25 or 100 year permanence period. We go through the practical risks and rewards of that commitment in Carbon Farming in Australia, and carbon farming’s relationship to your farm’s broader environmental value in What Is Natural Capital.
Where the two worlds meet
There are two points of connection worth knowing about.
The first is supply chain pressure. Companies reporting under ASRS need to account for their Scope 3 emissions, which for a food or fibre business often means the emissions embedded in what its suppliers grow and produce. If you’re an agribusiness supplying a listed company, expect requests for your carbon data even if you’re nowhere near an ASRS threshold yourself.
The second is the ACCU market itself. Businesses covered by the Safeguard Mechanism, or simply chasing a voluntary net zero target, buy ACCUs to offset the emissions they haven’t yet eliminated at the source. That’s real demand from the corporate side of carbon accounting flowing into the agricultural side.
Worth being precise on one point though. Buying ACCUs to offset a footprint doesn’t change a company’s gross Scope 1, 2 or 3 numbers. Under AASB S2, gross emissions and offsets used have to be disclosed separately. Carbon accounting measures both sides honestly, without letting one erase the other on paper.
Where to start
- If you’re a business approaching mandatory disclosure, confirm whether your existing NGER data can form the backbone of your ASRS Scope 1 and 2 figures, then scope your Scope 3 boundary early.
- If you’re an agribusiness weighing up a carbon project, get an independent read on your natural capital and baseline before anyone puts a 25-year contract in front of you.
- Either way, the number needs to survive an audit or a buyer’s due diligence, not just sound reasonable on the day.
Frequently Asked Questions
No. Carbon accounting is the measurement of emissions or carbon storage. ESG reporting is the broader disclosure built on top of that data, alongside governance, social and other environmental metrics.
Possibly, if you supply a company that is. Group 1 and Group 2 reporters increasingly need emissions data from smaller suppliers to complete their own Scope 3 disclosure.
It relies on it. Credits issued under the ACCU scheme only exist because a recognised carbon accounting method, verified against a baseline, has calculated how much carbon a project has stored or avoided releasing.
No. It offsets them on paper by matching your emissions against verified carbon removed or avoided elsewhere. Your gross emissions figure stays the same and has to be disclosed as such.
How Acumentis can help
We sit across both sides of this: a national ESG advisory team working alongside 120 years of property and agricultural valuation experience. Whether you need your Scope 1, 2 and 3 accounting audit-ready for an ASRS disclosure, or an independent read on what your land’s carbon and natural capital is actually worth before you sign anything, reach out to our team for a straight conversation, no jargon, no obligation.
