Quick Summary
Mandatory ESG (Environmental, Social and Governance) reporting in Australia began on 1 January 2025 under the Australian Sustainability Reporting Standards (ASRS). If your company prepares annual financial reports under the Corporations Act and meets two of three size tests (from 1 July 2027, the lowest group is consolidated revenue of $50 million or more, gross assets of $25 million or more, or 100 or more employees), you are likely in scope for mandatory climate-related financial disclosures. This guide covers who must report, the phased timeline, Scope 1/2/3 emissions requirements, penalties for non-compliance, and how mid-market businesses can prepare for 2026 and beyond.
Key fact: IMARC Group values the Australian environmental consulting services market at USD 751.9 million in 2025, growing to USD 1,186.3 million by 2034. For companies that meet the thresholds, climate reporting is a legal obligation, not an option.
Table of Contents
- What Is ESG Reporting and Why Is It Mandatory?
- Who Must Comply in 2026?
- The ASRS Framework Explained
- Scope 1, 2 and 3 Emissions: What You Need to Report
- Phased Implementation Timeline 2025-2030
- Penalties for Non-Compliance
- How Mid-Market Businesses Can Prepare
- How to Automate ESG Reporting
- Getting Started Checklist
- Frequently Asked Questions
What Is ESG Reporting and Why Is It Mandatory?
ESG reporting is the practice of disclosing information about a company's environmental impact, social responsibility, and governance practices. In Australia, this has moved from a voluntary "nice to have" exercise to a legally mandated requirement.
The Treasury Laws Amendment (Financial Sector Disclosure and Climate Reporting) Act 2024 introduced mandatory climate-related financial disclosures for large Australian companies. The framework is built on the Australian Sustainability Reporting Standards (ASRS), which are aligned with the international ISSB (International Sustainability Standards Board) standards.
Why Australia Made ESG Reporting Mandatory
| Driver | Detail |
|---|---|
| Investor demand | Institutional investors managing trillions of dollars now require ESG data to allocate capital. BlackRock, Vanguard and Australian superannuation funds all mandate ESG disclosure. |
| Climate risk to the financial system | APRA and ASIC have identified climate risk as a material threat to financial stability. Mandatory reporting ensures markets can price this risk accurately. |
| International alignment | The EU, UK, New Zealand, Japan and Canada have all introduced mandatory ESG reporting. Australia needed an equivalent framework to maintain investment competitiveness. |
| Supply chain pressure | Global companies with Australian subsidiaries are required to report under their home jurisdiction standards. Australian legislation ensures consistency. |
| Consumer and employee expectations | Customers and talent increasingly choose companies with demonstrated sustainability commitments. ESG reporting provides the evidence. |
The Market Context
| Metric | Value |
|---|---|
| Environmental consulting services market (Australia) | USD 751.9 million (2025), growing to USD 1,186.3 million (2034), a 5.04% CAGR (IMARC Group) |
| Who is in scope | Group 1 from 2025, with Groups 2 and 3 phased in from 1 July 2026 and 1 July 2027 |
Who Must Comply in 2026?
Mandatory ESG reporting applies to companies meeting specific size thresholds. The thresholds are phased in over several years, starting with the largest companies and progressively including smaller entities.
ASRS Reporting Groups
| Group | Revenue Threshold | Asset Threshold | Employee Threshold | First Reporting Period |
|---|---|---|---|---|
| Group 1 (Large entities) | $500 million or more | $1 billion or more | 500 or more employees | Financial years commencing on or after 1 January 2025 |
| Group 2 (Medium-large entities) | $200 million or more | $500 million or more | 250 or more employees | Financial years commencing on or after 1 July 2026 |
| Group 3 (Medium entities) | $50 million or more | $25 million or more | 100 or more employees | Financial years commencing on or after 1 July 2027 |
An entity is in a group if it meets at least two of the three tests. NGER registered corporations, and registered schemes, super funds and retail CCIVs above asset thresholds, are also brought in. Source: ASIC RG 280, Table 2.
Who Is In Scope Right Now (2026)
If your company meets any two of the three Group 1 criteria (revenue $500M+, assets $1B+, 500+ employees), you are required to report for the 2025 financial year, with your first report due in 2026.
This includes:
- ASX 200 listed companies
- Large private companies meeting the thresholds
- Foreign-owned subsidiaries operating in Australia
- Registered schemes, super funds and retail CCIVs with assets of $5 billion or more (from Group 2)
- Insurance companies meeting the size tests
Who Is Coming Into Scope (2026-2027)
If your company meets any two of the Group 2 or Group 3 criteria, you will be required to report in the coming years. Even if you are not yet legally required to report, there are strong reasons to prepare now:
| Reason | Why It Matters |
|---|---|
| Supply chain demand | Larger companies in Group 1 need Scope 3 emissions data from their suppliers, including mid-market companies not yet in scope |
| Investor expectations | Investors and lenders increasingly request ESG data regardless of mandatory thresholds |
| Government procurement | Federal and state governments increasingly require ESG evidence in tender processes |
| Preparation time | Building data collection systems, processes and reporting capability takes 12-24 months |
| Competitive advantage | Companies that report early signal sustainability leadership to customers, investors and talent |
The Supply Chain Ripple Effect
This is the most important point for mid-market businesses (50-500 employees) that may not yet be directly in scope of mandatory reporting:
If you supply goods or services to a Group 1 company, they need your Scope 3 emissions data to complete their own report.
| Scenario | Impact |
|---|---|
| You supply manufacturing components to an ASX 200 company | They will request your Scope 1 and 2 emissions data |
| You provide logistics services to a large retailer | They need your transport emissions included in their Scope 3 |
| You are a construction subcontractor | The prime contractor needs your project emissions |
| You operate a SaaS platform for enterprise clients | They may request your data centre energy usage and carbon footprint |
This means that even if you are not legally required to report, market pressure will force you to collect and disclose ESG data within the next 12-24 months. Companies that prepare now will have a competitive advantage when their customers start asking.
The ASRS Framework Explained
The Australian Sustainability Reporting Standards (ASRS) are issued by the Australian Accounting Standards Board (AASB) and set out what information companies must disclose about climate-related risks and opportunities.
The Four Core Pillars
| Pillar | What You Must Disclose |
|---|---|
| 1. Governance | How your board and management oversee climate-related risks and opportunities. This includes board expertise, management's role, and how climate is integrated into governance processes. |
| 2. Strategy | How climate-related risks and opportunities affect your business model, strategy, and financial performance. This includes scenario analysis (how your business performs under different climate scenarios). |
| 3. Risk Management | How you identify, assess and manage climate-related risks. This includes integration with your overall risk management framework and specific risk mitigation actions. |
| 4. Metrics and Targets | The specific metrics you use to measure climate-related risks and opportunities, including Scope 1, 2 and 3 greenhouse gas emissions, energy usage, and any climate-related targets you have set. |
What Makes ASRS Different from Voluntary ESG Reporting
| Aspect | Voluntary ESG (Before 2025) | ASRS Mandatory Reporting (From 2025) |
|---|---|---|
| Legal obligation | Voluntary – companies chose what to report | Mandatory – legally enforceable for companies in scope |
| Standard framework | Companies used various frameworks (GRI, SASB, TCFD) | Single Australian standard (ASRS) aligned with ISSB |
| Assurance | Limited or no independent assurance | Progressive assurance requirements (limited assurance from 2025, reasonable assurance expected by 2030) |
| Scope 3 emissions | Optional – companies reported only Scope 1 and 2 | Required for most companies in scope (with transitional relief for Scope 3 in early years) |
| Scenario analysis | Optional or simplified | Required – companies must model performance under at least two climate scenarios |
| Penalties | None | Financial penalties and potential director liability for false or misleading disclosures |
Scope 1, 2 and 3 Emissions: What You Need to Report
Greenhouse gas emissions are the core metric of climate-related financial disclosure. The ASRS requires companies to report emissions across three "scopes" based on the GHG Protocol.
Scope 1: Direct Emissions
What it covers: Emissions from sources that your company owns or controls directly.
| Source | Examples |
|---|---|
| Stationary combustion | Natural gas boilers, diesel generators, coal-fired heating |
| Mobile combustion | Company-owned vehicles (cars, trucks, forklifts) burning petrol or diesel |
| Process emissions | Chemical reactions during manufacturing or processing |
| Fugitive emissions | Refrigerant leaks from air conditioning, methane from waste |
Who reports this: All companies in scope of mandatory reporting.
Scope 2: Indirect Emissions from Energy
What it covers: Emissions from the generation of electricity, steam, heating and cooling that your company purchases.
| Source | Examples |
|---|---|
| Purchased electricity | Grid electricity used in offices, warehouses, factories |
| Purchased steam/heating | District heating, purchased steam for industrial processes |
| Purchased cooling | Chilled water from district cooling systems |
Who reports this: All companies in scope of mandatory reporting.
Scope 3: Value Chain Emissions
What it covers: All other indirect emissions in your company's value chain – both upstream (suppliers) and downstream (customers).
| Category | Examples |
|---|---|
| Purchased goods and services | Emissions embedded in raw materials, supplies, and services you buy |
| Capital goods | Emissions from manufacturing equipment, buildings, and vehicles you purchase |
| Fuel and energy activities | Emissions from extraction, production and transportation of energy you use |
| Upstream transportation | Emissions from logistics, freight, and distribution of purchased goods |
| Business travel | Flights, accommodation, and rental cars for employee business travel |
| Employee commuting | Emissions from staff travelling to and from work |
| Downstream transportation | Emissions from distribution and transportation of your sold products |
| Use of sold products | Emissions from customers using your products (if energy-intensive) |
| End-of-life treatment | Emissions from disposal of your products after use |
| Investments | For financial services, emissions from financed activities |
Who reports this: Required for Group 1 companies from 2025, with transitional relief (Scope 3 reporting may be deferred in the first reporting period for companies that need time to collect data). Group 2 and 3 companies will also be required to report Scope 3 when they come into scope.
Why Scope 3 Is the Hardest
| Challenge | Impact |
|---|---|
| Data availability | Many suppliers do not measure or disclose their emissions, so you must estimate |
| Boundary setting | Deciding which value chain emissions to include and which to exclude is complex |
| Methodology | Multiple calculation methods exist, and choosing the right one requires expertise |
| Ongoing collection | Scope 3 data must be collected continuously, not as a one-time exercise |
| Assurance readiness | As assurance requirements tighten, your Scope 3 methodology must be auditable |
This is where many companies struggle. For many businesses Scope 3 is the largest part of the footprint, but collecting reliable data requires supply chain engagement, data systems, and expertise that most mid-market businesses do not have in-house.
Phased Implementation Timeline 2025-2030
The Australian government has adopted a phased approach to mandatory ESG reporting, giving companies time to build their capability.
Phase 1: Group 1 (2025-2026) – LARGE ENTITIES
| Date | Requirement |
|---|---|
| 1 January 2025 | Mandatory reporting begins for Group 1 companies (revenue $500M+, assets $1B+, 500+ employees) |
| 2025 financial year | Companies collect data across all four pillars (governance, strategy, risk management, metrics and targets) |
| 2026 | First ASRS reports published for 2025 financial year |
| Assurance | Limited assurance required on Scope 1 and 2 emissions |
| Scope 3 | Not required in the first annual reporting period; statements about Scope 3 have limited liability protection for reports for financial years starting between 1 January 2025 and 31 December 2027 (RG 280) |
Phase 2: Group 2 (from 1 July 2026), MEDIUM-LARGE ENTITIES
| Date | Requirement |
|---|---|
| 1 July 2026 | Mandatory reporting begins for Group 2 companies (two of: revenue $200M+, assets $500M+, 250+ employees) |
| 2026-27 financial year | Data collection and first reporting period (for 30 June year ends) |
| 2027 | First ASRS reports published |
| Assurance | Limited assurance required on Scope 1 and 2 emissions |
Phase 3: Group 3 (from 1 July 2027), MEDIUM ENTITIES
| Date | Requirement |
|---|---|
| 1 July 2027 | Mandatory reporting begins for Group 3 companies (two of: revenue $50M+, assets $25M+, 100+ employees) |
| 2027-28 financial year | Data collection and first reporting period (for 30 June year ends) |
| 2028 | First ASRS reports published |
| Assurance | Limited assurance required on Scope 1 and 2 emissions |
Progressive Assurance Timeline
| Year | Assurance Level | What It Means |
|---|---|---|
| 2025-2026 | Limited assurance | Auditor confirms nothing has come to their attention that suggests the data is materially misstated |
| 2027-2028 | Limited assurance (expanded) | Assurance may expand to include Scope 3 and scenario analysis |
| 2029-2030 | Reasonable assurance (expected) | Auditor provides positive assurance opinion – data is stated to be accurate and complete |
| 2030+ | Full assurance (expected) | Comprehensive assurance on all disclosed metrics, including social and governance metrics if expanded |
What This Means for Your Business
| Your Situation | Action Required |
|---|---|
| Group 1 company | You should already be reporting. If your data collection is still manual, fix it before the next cycle. |
| Group 2 company | Your first reporting period has started (financial years beginning on or after 1 July 2026). Data collection systems need to be running now. |
| Group 3 company | Your first reporting period begins with financial years starting on or after 1 July 2027. Start your readiness assessment now, as Scope 3 data collection takes time. |
| Supplier to Group 1 company | Expect data requests from your customers. Start measuring your Scope 1 and 2 emissions now. |
| Below all thresholds | Monitor the situation. Customers, lenders and government buyers may still ask for your emissions data. |
Penalties for Non-Compliance
The consequences of failing to comply with mandatory ESG reporting requirements are significant.
Legal Penalties
| Penalty | Detail |
|---|---|
| ASIC enforcement action | ASIC has the power to investigate and penalise companies that fail to lodge required reports or provide false or misleading information |
| Financial penalties | Civil penalties under the Corporations Act and ASIC Act can apply to misleading or deceptive disclosures, subject to the modified liability rules for some statements in the early years |
| Director liability | Individual directors may face personal liability for knowingly approving false or misleading ESG disclosures |
| Injunctions | Courts can issue injunctions requiring companies to correct misleading ESG disclosures |
Commercial Penalties
| Penalty | Detail |
|---|---|
| Investor withdrawal | Institutional investors may divest from companies that fail to provide required ESG data |
| Increased borrowing costs | Banks and lenders increasingly factor ESG performance into lending decisions and interest rates |
| Government contract disqualification | Companies without compliant ESG reporting may be excluded from federal and state government procurement panels |
| Supply chain exclusion | Large companies may switch suppliers that cannot provide Scope 3 emissions data |
| Insurance implications | Insurers may adjust premiums or coverage based on ESG compliance and climate risk management |
Reputational Penalties
| Penalty | Detail |
|---|---|
| Media exposure | Non-compliance with mandatory reporting is likely to attract negative media coverage, especially for ASX-listed companies |
| Customer loss | Customers increasingly choose companies with demonstrated sustainability commitments |
| Recruitment difficulty | Top talent, particularly among younger workers, prefer employers with strong ESG track records |
| Industry standing | Companies that lag on ESG reporting lose credibility with peers, industry bodies, and regulators |
How Mid-Market Businesses Can Prepare
If you are a mid-market business (50-500 employees) and are not yet directly in scope of mandatory reporting, here is how to prepare:
Step 1: ESG Readiness Assessment (Weeks 1-4)
Evaluate your current ESG data, practices and gaps:
- Map your current energy usage, fleet emissions, and waste management
- Identify existing sustainability policies and governance structures
- Assess data availability for Scope 1, 2 and 3 emissions
- Review supply chain data collection capability
- Identify your reporting obligations (direct or indirect through customer demand)
Step 2: Build Data Collection Systems (Months 2-4)
Implement systems to capture the data you will need:
- Install energy monitoring on major facilities
- Track fleet fuel consumption and mileage
- Collect supplier emissions data (or estimate using spend-based methods)
- Set up business travel emissions tracking
- Document waste and water usage
Step 3: Calculate Your Carbon Footprint (Months 4-6)
Convert your collected data into emissions using recognised methodologies:
- Use the GHG Protocol Corporate Standard as your methodology
- Apply Australian government emissions factors for electricity and fuel
- Estimate Scope 3 emissions using industry-average data where supplier-specific data is unavailable
- Document your calculation methodology for assurance readiness
Step 4: Develop Your ESG Narrative (Months 6-8)
Go beyond compliance – tell your sustainability story:
- Identify climate-related risks to your business model
- Map climate-related opportunities (energy efficiency, new products, market differentiation)
- Set measurable sustainability targets
- Prepare your first ESG report (even if not yet mandatory)
- Engage your board and management in ESG governance
Step 5: Continuous Improvement (Ongoing)
- Update your emissions data annually
- Track progress against your targets
- Prepare for assurance requirements as they apply to your group
- Monitor regulatory changes and threshold updates
- Share your ESG progress with customers, investors and employees
How to Automate ESG Reporting
Traditional ESG reporting is manual, time-intensive and error-prone. Data is collected from spreadsheets, emails and utility bills, then manually consolidated into reports. Most of the effort sits in collecting and consolidating the same data every period, and that is the part worth automating.
Manual vs Automated ESG Reporting
| Aspect | Manual ESG Reporting | Automated ESG Reporting |
|---|---|---|
| Data collection | Manual: spreadsheets, emails, phone calls to suppliers | Scheduled exports or integrations from utilities, ERP, travel systems and supplier portals |
| Scope 3 estimation | Manual research of industry averages and spend-based methods | Spend-based estimates applied consistently from accounting data, replaced by supplier data as it arrives |
| Calculation accuracy | Human error in formulas and emissions factor application | One documented calculation model with validated emissions factors and an audit trail |
| Report generation | Weeks of effort consolidating spreadsheets into a report | Disclosure tables fed from the calculation model, then reviewed by people |
| Scenario analysis | Manual modelling with limited scenarios | Reusable scenario models that can be rerun as assumptions change |
| Ongoing monitoring | Annual snapshot, data is stale between reporting cycles | Monthly or quarterly updates to an ESG dashboard |
| Assurance readiness | Evidence assembled reactively when auditor requests | Evidence and data lineage kept as you go |
A Practical Approach to ESG Data
- Connected data sources: Pull emissions-relevant data from energy providers, your ERP system, travel booking platforms and fleet management tools instead of re-keying it.
- Scope 3 estimation: Where supplier data is unavailable, estimate Scope 3 emissions using spend-based methods, industry benchmarks and supply chain analysis, and document the method.
- ASRS-aligned reporting: Structure disclosures across all four pillars (governance, strategy, risk management, metrics and targets) in the form auditors expect.
- Ongoing ESG dashboard: Track emissions, energy usage, progress against targets and compliance readiness through the year rather than in an annual scramble.
- Scenario analysis: Model how your business performs under different warming scenarios (1.5C, 2C, 3C+) with financial impact estimates.
Bottom Line: ESG reporting is mandatory and unavoidable for Australian businesses. The question is whether you approach it as a compliance burden (manual, expensive, annual panic) or as an ongoing capability (automated data collection, board-ready at all times).
Getting Started Checklist
Use this checklist to evaluate your ESG reporting readiness:
Governance
- Does your board have oversight of climate-related risks?
- Is climate risk integrated into your enterprise risk management framework?
- Do you have a designated ESG officer or team?
Data Collection
- Do you track electricity consumption across all facilities?
- Do you track fleet fuel consumption and vehicle mileage?
- Do you collect waste and water usage data?
- Do you track business travel (flights, accommodation, car hire)?
- Do you have data on supplier emissions (or at least spend data for estimation)?
Emissions Calculation
- Have you calculated your Scope 1 emissions?
- Have you calculated your Scope 2 emissions (location-based and market-based)?
- Have you estimated your Scope 3 emissions (even if rough)?
- Are you using recognised emissions factors (Australian government, IEA, EPA)?
- Is your calculation methodology documented and reproducible?
Reporting Readiness
- Can you produce a report covering all four ASRS pillars?
- Is your data auditable (every number traceable to source)?
- Have you conducted climate scenario analysis?
- Have you set measurable sustainability targets?
- Is your report structured for external assurance?
Scoring Your Self-Assessment
| Score | What It Means | Next Step |
|---|---|---|
| 0-5 checks passed | Minimal ESG capability | Engage an ESG consultant for full readiness assessment and implementation |
| 6-12 checks passed | Some data collection exists | Target Scope 1 and 2 calculation within 3-6 months |
| 13-18 checks passed | Good foundation, gaps in Scope 3 | Estimate Scope 3 emissions and prepare first report draft |
| 19-22 checks passed | Strong ESG reporting posture | Focus on assurance readiness and continuous improvement |
Frequently Asked Questions
Do I have to report under ASRS if I am a mid-market company?
Not if you stay below the Group 3 thresholds (at least two of: revenue $50M, gross assets $25M, 100 employees), which apply from financial years starting on or after 1 July 2027. ASIC notes that a company meeting two of these tests will not be caught until 2028 at the earliest. However, if you supply goods or services to a Group 1 company, they will request your Scope 3 emissions data to complete their own report. This effectively puts reporting pressure on your supply chain regardless of your direct legal obligations. Additionally, government procurement processes and investors increasingly request ESG data, so voluntary reporting is becoming a business necessity.
What is the difference between ASRS and the TCFD?
The TCFD (Task Force on Climate-related Financial Disclosures) was a voluntary international framework. The ASRS is a mandatory Australian reporting standard with legal force. The ASRS is closely aligned with the TCFD recommendations but goes further in specificity and enforceability. Companies that previously reported under TCFD will find that ASRS covers similar ground with stricter requirements.
How much does ESG reporting cost for a mid-market business?
There is no published benchmark for these costs, and they vary widely with the number of sites, the complexity of your supply chain and the assurance required. The main cost items are:
| Service | What Drives the Cost |
|---|---|
| ESG readiness assessment | Number of entities and sites, state of existing data |
| Scope 1 and 2 emissions calculation | Number of energy and fuel sources, quality of bills and meter data |
| Scope 3 emissions estimation | Supply chain complexity and how much supplier data is available |
| First annual climate report | Scope of disclosures and the assurance level |
| Ongoing annual reporting and monitoring | How much of the data collection is automated |
Get quotes against a written scope.
Automating data collection and calculation reduces the ongoing effort, particularly from the second reporting cycle onwards.
What happens if I cannot collect Scope 3 data from my suppliers?
The ASRS recognises that Scope 3 data collection is challenging. In the early years of mandatory reporting, transitional relief is available. Companies may use estimates based on spend-based methods, industry averages, and sector benchmarks when supplier-specific data is unavailable. The expectation is that companies will progressively improve the accuracy of their Scope 3 estimates over time as supplier data becomes available.
Can I use ESG reporting software instead of hiring a consultant?
ESG software platforms (such as Sphera, Enablon, or Persefoni) can help with data management and report generation. However, they require your team to input data, configure the platform, and interpret results. For mid-market businesses without dedicated ESG staff, a managed service that combines software capability with expert guidance is typically more effective and cost-efficient.
How does ESG reporting interact with Modern Slavery Act reporting?
Both are mandatory reporting obligations for Australian companies, but they cover different areas. The Modern Slavery Act requires entities with annual consolidated revenue of at least $100 million (Modern Slavery Act guidance) to report on modern slavery risks in their operations and supply chains. ESG reporting under ASRS focuses on climate-related financial disclosures. However, there is overlap in supply chain due diligence, and companies can address both obligations through an integrated sustainability reporting approach.
Ready to Start Your ESG Reporting Journey?
Work out which reporting group you fall into, run the checklist above, and start measuring Scope 1 and 2 emissions now even if your first reporting period is a year or two away. If you want help scoping your obligations and setting up the data collection behind your first report, see our ESG reporting service.