How is sustainability reporting different for small vs. large companies?
No matter the size of your business, sustainability reporting should be a key business strategy. It’s critical if you are part of a larger supply chain. Customers, lenders, and business partners want to know about your organization’s environmental impact, energy use, and social responsibility. In fact, many large companies now evaluate suppliers based on sustainability performance. Having at least a basic report can set you apart when bidding for contracts.
However, reporting on your sustainability-related metrics, typically called “sustainability reporting” or “impact reporting,” is quite different for large public companies compared to small ones. It can be confusing because there is not one overarching authority. What’s more, regulations vary according to region. Also, what is considered a small to medium-sized enterprise can vary.
What is the definition of a "small business"?
There are 4 main factors that determine whether your business is considered a small, medium or micro enterprise for sustainability reporting purposes:
- o Size in terms of revenue and/ or number of employees
- o Industry sector
- o Geographical location/ jurisdiction
- o Framework or Standard used for reporting
Because there is no single definition, most reporting frameworks take a practical approach instead of hard and fast rules when determining if a business is small. Here are some rules of thumb to follow:
United States – SBA (Small Business Administration)
The SBA sets size standards by industry (NAICS code).
- Manufacturing:
Usually defined as a business with fewer than 500 employees.
(Some subsectors go up to 750 or even 1,000 employees depending on the product type.) - Revenue standards:
Range roughly from $7.5 million to $40 million in annual revenue, again depending on the sector.
👉 For sustainability purposes, many frameworks and supply-chain programs use “under 500 employees” as the practical definition of “small manufacturer.”
European Union
Under the EU definition, a small enterprise is one with:
- <50 employees, and
- Annual turnover or balance sheet total ≤ €10 million.
A medium enterprise (SME) has:
- <250 employees, and
- Turnover ≤ €50 million (or balance sheet ≤ €43 million).
For sustainability reporting under the EU Corporate Sustainability Reporting Directive (CSRD):
- Large companies (meeting at least two of these: >250 employees, >€40M turnover, >€20M assets) are required to report.
- SMEs that are listed will begin phased reporting around 2027, but non-listed SMEs are generally exempt and can report voluntarily.
How It Varies by Industry
Industry | Typical “Small Business” Definition (U.S.) | Notes |
Manufacturing | <500 employees | Often the benchmark for supply-chain sustainability reporting. |
Wholesale Trade | <100 employees | Smaller threshold due to lower labor intensity. |
Construction | <$45 million annual revenue | Revenue-based due to project variability. |
Professional Services | <$20 million annual revenue | Often smaller, knowledge-based firms. |
So, a 300-employee metal fabrication plant might be “small,” while a 300-employee software company would be “large” in its sector if it’s revenue was $20 million or more.
How reporting may vary according to the Standards or Framework used
Global Reporting Initiative (GRI): Allows simplified disclosure for smaller entities; focuses on material issues rather than full frameworks.
- SME Climate Hub / Science Based Targets initiative (SBTi) for SMEs: Open to companies with <500 employees.
- B Lab (B Corp Certification): Applies to any privately held company, but most participating firms are under 250 employees.
The good news is that small businesses have unique advantages: you can be more flexible and responsive when reporting. You don’t need to spend a fortune on expensive software or consultants. You can measure your impact using simple tools, such as spreadsheets. However, it’s important to be aware of stakeholder expectations and to follow some basic reporting rules. Using globally accepted standards, such as the GRI Standards, will help you cover all of your bases.
image source: ascm.org
Reporting requirements for small vs. large companies
Folks at small businesses might be relieved when they realize that they aren’t subject to the same regulations and expectations as larger ones are. Large, public companies have to disclose carbon emissions, climate risks, policies, and other ESG data to investors and regulators.
What small businesses need to know is that large companies are often required to report data from companies that they do business with also.
Yes, small private companies are generally not required to report — yet. But, be prepared that your customers and supply-chain partners might start asking anyway. Small businesses are increasingly expected to share data about carbon emissions, sourcing, worker safety. They may also need to provide what policies they have in place for these and other topics. As global crises worsen, it’s a good bet that regulations will become stricter. At this time, for small businesses, sustainability reporting isn’t about checking a compliance box — it’s about staying competitive, building trust, and doing your part to contribute to the greater good.
When it comes to regulations, here are the main differences between small and large companies:
- Large Public companies:
- Must follow mandatory disclosure requirements (e.g., the International Financial Reporting Standards, or “IFRS”).
- Sustainability reports need to be audited by a third party.
- Must meet strict regulations like the EU’s climate disclosure rules.
- They can incur significant financial penalties for non-compliance.
- Private small businesses:
- Reporting is mostly voluntary and less formal.
- Often driven by customer or supply-chain pressures, not legal mandates; for example, when one of your buyers asks about your greenhouse gas emissions.
- Not generally subject to financial penalties related to reporting
According to a 2024 Thomson Reuters report on supply chain resilience, regulations are the largest driver for large companies to request sustainability data from their suppliers.
Key takeaway: For big corporations, sustainability reporting is a legal obligation. Reputation, opportunity, and stakeholder relationships drive it for small businesses. For smaller firms, standardized sustainability reporting helps you stay competitive in supply chains that are becoming more transparent.
Frameworks and Reporting Standards: there is not one universal standard
But the Global Reporting Initiative (GRI) Standards come the closest.
Large public companies are required to use standardized reporting, also called following “mandatory disclosure requirements.” They typically follow more than one standard/ framework. This is based on the type of data they’re reporting, where they do business, or their audience. For example, they may use CDP (formerly Carbon Disclosure Project) for reporting greenhouse gas emissions. They may use the International Sustainability Standards Board (ISSB) Standards for reporting to investors.
There are some simpler frameworks designed for smaller enterprises, such as the B Corp Impact Assessment. However, you should consider using standards that are also used by larger companies. Why? There are 3 main reasons:
- o If you do business with a larger company, they may need you to follow the same standards that they follow.
- o As your company grows, you will already have a solid foundation for reporting.
- o As regulations get stricter, you will be prepared.
It can be confusing for small businesses to know which standards to use. The GRI Standards are usually a fail-safe choice because they are widely used globally. By using these standards, you will have a repeatable, consistent process and appropriate documentation as well.
Resources and Capacity: Working with What You Have
Small businesses can start reporting without having to use specialized software.
Big companies have entire ESG departments, specialized consultants, and robust data-tracking systems. They may spend tens or even hundreds of thousands of dollars on reporting software. They can also afford third-party assurance and professionally designed publications.
Small businesses, as you know, operate differently. You might have one person or a small team juggling multiple priorities. Time, expertise, and the budget may be vastly more limited. That’s why the most effective small-business sustainability efforts focus on simplicity, standardization, and identifying your most significant impacts. Start with what’s easy to measure and the most strategic for your operations, such as:
- o Energy use and efficiency improvements
- o Waste reduction and recycling
- o Water consumption
- o Procurement practices
- o Health and safety performance
Basic data tracked in a spreadsheet can be enough for a credible sustainability report when you are just getting started.
Key takeaway: Focus on the metrics that are most significant for your operations to begin with. Then, work your way up to full-scale reporting. When you’re a small business, your sustainability report does not have to be a 500-page award-winning publication. A short summary is enough to start. However, for most businesses (except office-based ones), greenhouse gas emissions, at a minimum, should be reported. This is because more and more large businesses are required to report on their supply chain’s emissions, both downstream and upstream.
Audience & stakeholder expectations
Know Your Audience: Who will be reading your report?
A public company’s audience includes investors and regulators, as well as the public. For small companies, it’s different. Your audience is typically the people you do business with every day:
- Customers who want to know whether your products are responsibly made.
- Suppliers who may need your data for their own reporting requirements.
- Employees and local communities who care about opportunity and environmental stewardship.
By focusing on what matters to your stakeholders, you can make sustainability reporting a tool for relationship-building. Sharing your sustainability story—how you’ve reduced waste, improved efficiency, or supported your local community—helps strengthen your reputation and attract new customers.
Key takeaway: Big corporations report to investors and regulators as well as the public; small businesses report to customers and the local community as well as to business partners in the supply chain. Standardized reporting helps strengthen trust and partnerships.
Conclusion
Start Small, Grow Over Time.
Standardized sustainability reporting isn’t just for global corporations—it’s a powerful tool for small businesses to demonstrate responsibility, efficiency, environmental stewardship, and resilience. It shows that you are a trustworthy partner.
You don’t need a consultant or a complex framework to get started. Begin with your most significant impacts (the GRI Standards help you to identify these), follow accepted standards/ frameworks, communicate your progress clearly, and grow from there. Sustainability reporting gives your company a competitive edge. It can open doors to new contracts, lower your risks, enhance your reputation, and help you attract top talent.
Over time, you can expand your efforts. The key is setting a solid foundation. Using accepted global standards will help you with that. Each year, build on your previous work and celebrate your improvements!
Ready to create your first sustainability report?
Visit sustainabilityreport.io for step-by-step guides and data collection templates. It’s risk-free, we offer a 30-day money-back guarantee.
Featured image source: Image by Albrecht Fietz from Pixabay