What Is a Materiality Assessment? A Practical Guide for Australian Businesses

If you’ve started reading about ESG strategy, you’ve likely encountered the term “materiality assessment.” It’s a cornerstone concept, but one that confuses many business leaders. What makes an issue “material”? How do you assess it? Why does it matter for your business?

This guide explains materiality assessment in plain language, with practical frameworks you can apply to your Australian business. You’ll understand the concept of double materiality (now required under AASB S1), how to conduct assessment, and why it’s essential to building a credible ESG strategy. For a comprehensive overview of ESG strategy more broadly, see our complete ESG strategy guide.

What Is Materiality in ESG?

Materiality refers to the ESG issues that significantly affect your business or stakeholders. In ESG, materiality has expanded to include two dimensions:

Financial Materiality (Business Impact)

Financial materiality asks: Which ESG issues could reasonably influence investors’ economic decisions about your company?

Examples:

• Supply chain disruption from water scarcity or climate events
• Regulatory changes affecting your licence to operate
• Employee recruitment and retention challenges affecting labour costs
• Climate-related physical risks to assets or operations
• Market shifts toward sustainable products or services

Financial materiality is about business risk and opportunity. It answers: “Does this ESG issue affect our financial performance, cost of capital, or investor confidence?”

Impact Materiality (Stakeholder Impact)

Impact materiality asks: Where does your organisation have significant actual or potential environmental or social impact?

Examples:

• Greenhouse gas emissions from operations or supply chain
• Water consumption affecting water scarcity in vulnerable regions
• Community health and safety impacts from facility operations
• Labour practices affecting worker wellbeing across your supply chain
• Indigenous land and cultural rights

Impact materiality is about your stakeholders and the communities you affect. It answers: “Where do we have responsibility to manage our environmental or social footprint?”

Understanding Double Materiality: AASB S1 Requirements

Australia’s AASB S1 (General Sustainability-related Disclosures) requires companies to assess and disclose both dimensions of materiality. This is a significant shift from older approaches that focused primarily on financial materiality.

Why Double Materiality Matters

Completeness: Assessing only financial materiality can lead to missing important social or environmental issues where you have significant impact but limited near-term financial exposure.

Authenticity: Double materiality reflects that organisations have genuine responsibility for their environmental and social impacts, not just financial consequences.

Stakeholder alignment: Employees, communities, and customers care about impact materiality. Double materiality makes your ESG strategy credible to all stakeholders.

Regulatory requirement: Under AASB S1, you must assess and disclose both dimensions. It’s not optional.

How the Two Dimensions Interact

An issue can be:

• High financial materiality, high impact materiality: Most critical. Requires strategic focus. Example: emissions reduction in high-impact industry.
• High financial materiality, low impact materiality: Important for business but limited stakeholder impact. Still must be managed. Example: cybersecurity for financial services.
• Low financial materiality, high impact materiality: Significant stakeholder impact but limited near-term financial risk. Still matters for licence to operate and long-term risk. Example: community water impacts for agricultural business.
• Low financial materiality, low impact materiality: Not a priority. Can be monitored but doesn’t require strategic focus.

Your materiality assessment should identify issues across all quadrants and explain your approach to managing each category.

Step-by-Step Materiality Assessment Process

Step 1: Define the Scope

First, clarify what you’re assessing:

• Which operations are in scope? Your direct business operations? Supply chains? Joint ventures? Subsidiaries?
• Geographic scope: Just Australia? International operations?
• Time horizon: Are you assessing current materiality or forward-looking?
• Stakeholder groups: Who will you consult? Investors, employees, customers, communities, regulators, suppliers?

Clear scoping prevents misunderstandings later and ensures assessment reflects your actual business context.

Step 2: Identify Potential ESG Issues

Create a comprehensive list of potential ESG issues relevant to your industry and business model. Start broad, then narrow. Sources include:

• Regulatory frameworks: AASB S1/S2, APRA CPG 229, Corporations Act, environmental law, workplace law
• Industry standards: GRI (Global Reporting Initiative) standards for your sector, SASB (Sustainability Accounting Standards Board), peer company disclosures
• International frameworks: TCFD (Task Force on Climate-related Financial Disclosures), OECD Guidelines, UN Sustainable Development Goals
• Emerging issues: What’s developing in your sector? Water scarcity, supply chain resilience, Indigenous engagement, circular economy, net zero transitions?
• Stakeholder feedback: What do customers, employees, investors ask about?

A comprehensive universe might include 20-40 potential issues. Don’t aim to assess everything—materiality assessment identifies priorities.

Step 3: Conduct Stakeholder Engagement

This is critical. You must understand what stakeholders think matters.

Investor interviews: Speak with major shareholders, superannuation funds, and asset managers. Ask what ESG issues they assess when evaluating investments. What risks concern them?

Employee surveys and focus groups: Understand which ESG issues resonate with your workforce. What affects recruitment and retention?

Customer engagement: Do customers care about ESG? What issues influence purchase decisions?

Supplier and supply chain partner interviews: What ESG expectations do you face from your customers or trading partners?

Community consultations: If you operate in specific communities, engage locally. What environmental or social impacts concern them?

Regulatory engagement: What are regulators signalling about important ESG issues for your sector?

Use surveys, focus groups, one-on-one interviews, and online platforms. Get sufficient sample size and diversity of voices.

Step 4: Assess Financial Materiality

For each issue, assess: Could this reasonably influence investors’ economic decisions?

Evaluate:

• Potential financial impact (revenue, costs, capital)?
• Probability of impact?
• Time horizon (near-term, medium, long-term)?
• Peer exposure to the same issue?
• Regulatory or market trends?

Rate each issue: High, medium, or low financial materiality. Be transparent about your reasoning.

Step 5: Assess Impact Materiality

For each issue, assess: Does your organisation have significant actual or potential environmental or social impact?

Evaluate:

• Scale of impact (how many people/ecosystems affected)?
• Severity of impact (how severe are the consequences)?
• Scope (which stakeholders are affected)?
• Reversibility (is the impact reversible or permanent)?
• Current management (do you already manage this well)?

Rate each issue: High, medium, or low impact materiality.

Step 6: Plot and Validate

Create a materiality matrix with financial materiality on the horizontal axis and impact materiality on the vertical. Plot each issue. Issues in the top-right are highest priority material issues.

Validate the matrix with your leadership team and board. Do they agree with prioritisation? Are there surprises or disagreements? Discuss and refine.

Step 7: Validation and Disclosure

Finalise your material issues list. Under AASB S1, you must disclose:

• How you identified material sustainability issues
• Your material sustainability issues
• How you assessed both financial and impact materiality
• Stakeholder engagement methodology

Be transparent about your process. Investors and regulators want to see rigorous, defensible assessment.

Special Considerations for Australian Businesses

Climate Risk Materiality

Climate risk is material for almost all Australian businesses. Consider:

• Physical risks: Exposure to droughts, floods, bushfires, extreme heat, water scarcity. Many Australian sectors—agriculture, mining, energy, construction, insurance—face significant physical risk.
• Transition risks: Regulatory changes, technology shifts, customer preferences moving toward lower emissions. Transition risks will affect fossil fuel-dependent businesses and energy-intensive sectors.
• Opportunity: Demand for renewable energy solutions, climate-resilient agriculture, sustainable finance, circular economy services.

Climate materiality assessment should use scenario analysis—evaluate your business under different climate scenarios (1.5°C, 2°C, etc.) and policy futures. TCFD provides a useful framework.

Water and Resource Materiality

Australia faces water scarcity, particularly outside major cities and in agricultural regions. For any water-dependent business—agriculture, mining, manufacturing—water materiality is high. Assess:

• Current and future water availability in your operating regions
• Competition for water with communities and ecosystems
• Regulatory changes around water allocation and pricing
• Community concerns about water use

Indigenous Engagement Materiality

If your business operates on or near Indigenous lands or affects Indigenous communities, Indigenous engagement is material. This is both a human rights issue (impact materiality) and a business risk (financial materiality). Australian investors increasingly assess Indigenous engagement quality.

Supply Chain Materiality

Australian businesses often have complex international supply chains. For many companies, supply chain ESG risks exceed direct operational risks. Assess:

• Labour practices and worker wellbeing across supply chains
• Environmental compliance of suppliers
• Supply chain resilience to climate and other shocks
• Transparency and traceability in supply chains

Common Challenges in Materiality Assessment

Challenge 1: Stakeholder disagreement – Different stakeholders prioritise different issues. Navigate this by being transparent about trade-offs. Your assessment must reflect both investor and community perspectives, even if they don’t perfectly align.

Challenge 2: Assessing emerging issues – How material is an ESG issue that hasn’t yet affected your business? Use scenario planning and trend analysis. Forward-looking assessment is important.

Challenge 3: Financial materiality is harder to quantify for some issues – How much does employee wellbeing affect financial performance? Use peer analysis, academic research, and expert judgment where quantification is difficult.

Challenge 4: Balancing comprehensiveness with focus – You can’t strategically focus on 40 material issues. Aim for 6-12 key material issues that represent your most significant risks and opportunities.

Using Your Materiality Assessment

Once you’ve completed assessment, use it to:

• Set ESG strategy priorities: Focus your ESG vision and strategic pillars on material issues.
• Set goals and targets: Develop specific targets for each material issue. See our guide on setting ESG goals and targets.
• Define KPIs: Create metrics to measure and track progress. See our ESG KPIs guide for specific examples.
• Drive resource allocation: Ensure budget and people focus on material issues.
• Guide risk management: Use materiality to shape risk assessment and management priorities. See our ESG risk management guide.
• Structure stakeholder engagement: Engage stakeholders most on material issues.
• Frame disclosure: Under AASB S1, your sustainability disclosures should focus on material issues.

Updating Your Materiality Assessment

Materiality isn’t static. Revisit your assessment annually or whenever material business changes occur:

• New regulations or policies
• Major acquisitions or divestitures
• Significant stakeholder feedback or expectations shift
• Emerging scientific evidence about risks or opportunities
• Significant business strategy changes

Annual reviews of materiality assessment keep your ESG strategy responsive and relevant.

Frequently Asked Questions

Is materiality assessment mandatory for all Australian businesses?

AASB S1 (including materiality assessment) is mandatory for large listed entities. For unlisted companies and SMEs, it’s increasingly expected by investors and customers, but not legally mandated. However, the practice of assessing material issues is valuable for any business building ESG strategy.

How many material issues should we have?

There’s no fixed number, but aim for 6-12 key material issues. Fewer might miss important areas; more than 12 becomes difficult to strategically manage. Group related issues if needed (e.g., “Climate and Energy” as one material issue area).

What if our stakeholders disagree on materiality?

This is common. Present your assessment transparently, showing how different stakeholder groups prioritised different issues. Explain your final prioritisation. Disagreement is okay as long as your process is rigorous and you’re responsive to diverse views.

How do we assess materiality for emerging issues (e.g., nature/biodiversity)?

Use forward-looking analysis. Research scientific evidence, regulatory trends, investor focus. Consult experts. Even if impact isn’t visible today, emerging issues can be material if trajectory suggests future significance.

Can we do a simple materiality assessment with limited budget?

Yes. Core elements (stakeholder engagement, issue identification, assessment) can be done internally with limited external support. What matters is process quality and stakeholder input, not budget size. Many SMEs conduct credible materiality assessment without major investment.

How does materiality assessment differ from risk assessment?

Materiality assessment identifies which ESG issues matter most. Risk assessment goes deeper into specific risks—probability, impact, mitigation—for each material issue. Materiality comes first; risk assessment follows. See our ESG risk management guide.

Moving Forward

Materiality assessment is foundational to credible ESG strategy. It ensures you focus on what matters—both for your business and for stakeholders. Under AASB S1, it’s mandatory for large companies. For all businesses, it’s smart practice.

Take time to do it well. The effort pays dividends in focused strategy, stakeholder trust, and business value.