SUSTAINABILITY8 min read

How Supply Chain Pressure Is Forcing Singapore SMEs to Report Emissions

Q: What is Scope 3 Category 1 and how does it relate to my business?

Scope 3 Category 1 — Purchased Goods and Services — covers the emissions associated with producing the goods and services that a company buys from its suppliers. When your client purchases products or services from you, your own Scope 1 and Scope 2 emissions become embedded in what they bought. Under GHG Protocol Scope 3 accounting, your client must include those embedded emissions in their Category 1 calculation. The more credible and documented your own Scope 1+2 data, the more accurate their Scope 3 report can be — and the less likely they are to use conservative estimates that may overstate your emissions footprint.

Q: Do Singapore SMEs have to report carbon emissions for supply chain purposes?

Singapore SMEs are not currently legally required to report carbon emissions. The mandatory SGX requirements apply only to listed companies. However, the commercial obligation is real: if your clients need your emissions data to complete their own mandatory disclosures, not providing it puts the supplier relationship at risk. Some procurement processes now score suppliers on ESG compliance alongside price and delivery. Being unable to provide a credible Scope 1+2 number — with documentation — is increasingly a competitive disadvantage.

Q: How do I respond to a supply chain carbon questionnaire?

The most defensible response to a supply chain carbon questionnaire is: a documented Scope 1+2 emissions figure (not an estimate), the methodology used to calculate it, the emission factor sources, and the reporting boundary. If you have been collecting utility bills, fuel records, and vehicle logs systematically, this is a data organisation exercise. If you have not, start with the most recent 12 months of utility bills (which give you Scope 2 electricity) and fuel purchase records (Scope 1 combustion). For a typical Singapore SME, these two categories cover 80–95% of total Scope 1+2 emissions. Structured reporting tools make this process significantly faster and produce an output that is directly usable by your client's sustainability team.

You did not sign up for carbon reporting. You run a supplies business, a logistics operation, a professional services firm — and then one day, an email arrives from the sustainability team at your largest client asking for your Scope 1 and Scope 2 emissions data. This is not a regulatory demand aimed at you. It is a commercial consequence of regulations aimed at the listed companies above you in the supply chain. And it is going to become far more common. Here is what is driving it, what you actually need to provide, and why suppliers who are ready will win business that suppliers who are not will lose.

The Email You Did Not Expect

Consider a Singapore F&B distribution company — call them a mid-size supplier of specialty ingredients to hotel groups and restaurant chains across the island. They have 45 staff, a warehouse in Tuas, six refrigerated delivery vans. They have never thought about carbon reporting.

Then, in late 2025, a questionnaire arrives from the procurement team of their largest client — a listed conglomerate that operates across hospitality, F&B, and retail. The questionnaire asks for: total Scope 1 and Scope 2 greenhouse gas emissions for the calendar year 2024, in tonnes of CO2 equivalent; the methodology used to calculate them; the emission factor source for electricity consumption; and a contact person in case the client's sustainability team has follow-up questions.

The F&B supplier has none of this. They have the utility bills somewhere, and probably the fuel receipts, but nobody has ever assembled them into an emissions calculation. The questionnaire has a two-week turnaround. The account manager at the listed client, when called, is sympathetic but clear: the sustainability team needs this data to complete the company's SGX report. It is not negotiable.

This scenario is playing out across Singapore right now, in manufacturing, logistics, professional services, retail supply chains, and every sector where unlisted SMEs supply to listed companies or MNC subsidiaries. If it has not happened to you yet, the probability is that it will within the next 24 months.

Scope 3 Category 1 and 3: Why Listed Companies Need Your Data

To understand why this is happening, you need to understand how greenhouse gas accounting works for a listed company.

The GHG Protocol Corporate Standard — the most widely used framework globally, and the foundation for IFRS S2 and Singapore's SGX reporting guidelines — divides emissions into three scopes. Scope 1 is direct emissions from the company's own operations. Scope 2 is indirect emissions from purchased electricity. Scope 3 is everything else — all the emissions that happen in the company's value chain but are not directly owned or controlled.

Scope 3 Category 1 — Purchased Goods and Services — is the single largest Scope 3 category for most companies. It covers the emissions embedded in everything the company buys: raw materials, packaging, IT equipment, professional services, cleaning services, office supplies. When your client buys from you, the emissions from your Scope 1 and Scope 2 operations are embedded in what you sold them. Your Scope 1+2 becomes their Scope 3 Category 1.

Scope 3 Category 3 — Fuel and Energy-Related Activities — covers upstream emissions from the energy your client's suppliers use to generate the electricity your client purchases. This is a more technical category but equally real.

The practical consequence: when a listed company calculates their Scope 3 Category 1 number, they need to know the emissions intensity of every significant supplier. If you cannot provide your Scope 1+2 data, they have two options: use an industry-average spend-based estimate (which is rough, often conservative, and not traceable to you specifically) or flag your entry as a data gap in their disclosure. Neither option is good for a long-term commercial relationship.

How your numbers flow into your client's report

Your Scope 1+2 emissions (the CO2e from your own operations) → Your client's Scope 3 Category 1 (Purchased Goods and Services) → Your client's total Scope 3 → Their SGX or IFRS S2 sustainability disclosure. Every link in that chain needs to be credible and documented. If your link is a rough estimate, it weakens the entire chain.

The SGX Scope 3 Timeline and What It Means for Suppliers

Singapore's SGX sustainability reporting requirements are structured as a phased rollout. Scope 1 and Scope 2 reporting became mandatory for all SGX Main Board and Catalist companies from FY2025. Scope 3 reporting is expected to begin on a best-efforts basis from FY2026, with more structured disclosure requirements emerging toward FY2030 as reporting standards and assurance capacity mature.

The phased nature of the timeline does not mean the pressure on suppliers is phased. Listed companies' sustainability teams are already working on their Scope 3 data collection strategies for FY2026 reports — which means their supplier questionnaires are going out now. They need to build supplier data sets, establish baselines, and develop methodology documentation before the reporting period ends. You are receiving the questionnaire in 2025 or 2026 because they are building their FY2026 Scope 3 data infrastructure.

The timeline also matters because of assurance. External assurance on Scope 1+2 becomes mandatory for SGX-listed companies from FY2029. When their assurer begins reviewing their Scope 3 data, they will ask: "For this Category 1 number, show me the supplier data sources and how they were verified." Suppliers who provided well-documented, methodology-consistent data will be straightforward to verify. Suppliers who provided rough estimates or verbal commitments will create assurance risk for the listed company — which is a very different kind of procurement conversation.

How Procurement Is Changing

The supply chain emissions dynamic is not just about satisfying a data request. It is changing how procurement works for a growing number of Singapore businesses and multinationals.

ESG-linked procurement criteria are appearing in tender documents across Singapore's corporate and government sectors. Some listed companies and MNCs have begun scoring suppliers on ESG performance alongside the traditional criteria of price, quality, and delivery performance. Singapore's government procurement has signalled sustainability criteria in specific categories. The trajectory is clear: ESG compliance is moving from a "nice to have" to a threshold requirement in certain procurement processes.

This is not universal yet — many Singapore procurement processes remain primarily price-driven. But the directional shift is real, and it is moving faster than most SME owners expect. The businesses that will be caught off-guard are those that dismiss the trend because their current client relationships feel secure. Client relationships built on price and service delivery can be disrupted by procurement policy changes that were not visible until they appeared in the RFP.

Contract terms are also evolving. Some MNC clients are beginning to include sustainability disclosure requirements in supplier contracts — an obligation to provide annual Scope 1+2 data, in a specified format, by a specified date. This converts the voluntary questionnaire into a contractual obligation. Being able to meet that obligation quickly and cleanly becomes a retention criterion.

What You Actually Need to Provide as a Supplier

When a client asks for your carbon data, the practical minimum they need is:

Your Scope 1 and Scope 2 emissions total for the relevant reporting period.This is usually the most recent full calendar year (January–December) or financial year, depending on the client's reporting cycle. It should be expressed in tonnes of CO2 equivalent (tCO2e). Breaking down the total into Scope 1 and Scope 2 separately is usually required.

The methodology and emission factor source.At a minimum: which framework you followed (GHG Protocol Corporate Standard is standard), which emission factors you used for electricity (Singapore's Energy Market Authority publishes an annual grid emission factor — approximately 0.4 kg CO2e per kWh in recent years, though it changes as Singapore's energy mix evolves), and which factors you used for fuel combustion (IPCC factors are standard for diesel and petrol).

Your organisational boundary. Which entities and sites are included in the calculation? If you have operations in multiple locations or countries, the client may need to know whether the number covers Singapore operations only or your full group.

A point of contact.The client's sustainability team will likely have follow-up questions. Having a named person who can respond to those questions — and who can produce the underlying documents (utility bills, fuel receipts) if the client's assurer asks to verify the numbers — is part of the submission.

The Competitive Advantage of Being Ready

Here is the positive angle that most discussions of supply chain carbon reporting miss: suppliers who can provide credible, documented carbon data have a genuine competitive advantage in markets where ESG-conscious clients are buying.

When a procurement team at a listed company sends questionnaires to eight suppliers and five of them respond with rough estimates or no data at all, the two or three who respond with a clean, methodology-documented Scope 1+2 figure stand out immediately. Not because their product is cheaper or their service is faster — but because they are easier to do business with in an ESG context, and because their data directly improves the quality of the listed company's own disclosure.

This dynamic is already visible in green procurement contexts. Some Singapore government tenders include sustainability criteria. Some MNC preferred supplier programmes score on ESG compliance. The suppliers who invested early in building their emissions data infrastructure are now able to respond to these requirements with minimal effort — while competitors are scrambling to produce something defensible in two weeks.

There is also a pricing dimension that is underappreciated. As sustainability becomes a procurement criterion, buyers who value ESG compliance are sometimes willing to pay a modest premium for suppliers who can demonstrate it clearly. This is not universal, and overstating it would be misleading. But in categories where products are largely commoditised and price competition is intense, a verified sustainability story is a genuine differentiator.

How to Get Ready Without a Full Sustainability Team

The good news for most Singapore SMEs is that Scope 1 and Scope 2 reporting does not require a dedicated ESG hire or a months-long consulting engagement. For a typical SME — office-based, with some vehicles and standard air-conditioning — the data you need is already in your records. It is just not organised.

Start with utility bills. Twelve months of SP Group electricity bills give you your Scope 2 number directly: total consumption in kWh, multiplied by Singapore's published grid emission factor. For most Singapore office and light industrial businesses, Scope 2 is 70–90% of total Scope 1+2 emissions.

Then add fuel. If you have company vehicles, fuel purchase records or fuel card statements give you your Scope 1 combustion data. Vehicle mileage logs, where you have them, provide an alternative basis for calculation. If you have on-site generators, diesel purchase records are the input.

For refrigerant leaks (often overlooked), your air-conditioning service records should show refrigerant top-up quantities. Multiply by the published global warming potential for the refrigerant type and you have your fugitive emissions.

The calculation itself is not the hard part. What takes time is assembling the evidence — organising 12 months of documents, applying the right factors, and documenting the methodology in a way that can be handed to a client or verified by an assurer. This is where structured tooling pays for itself. A platform like VerityOS is designed to take you from raw bills and fuel records to a documented, methodology-consistent Scope 1+2 summary — with the evidence attached and traceable — in a fraction of the time that manual Excel-based approaches take.

You do not need a full GRI sustainability report to respond to a supply chain questionnaire. You need a credible, documented Scope 1+2 figure and a one-page methodology statement. That is achievable without a sustainability consultant, if you have structured data collection and the right calculation infrastructure behind it.

The businesses that build this capability now — while the questionnaires are still coming in relatively small numbers — will be the ones who handle the full wave of supply chain data requests in FY2026 and beyond without disrupting their operations. The ones who wait will face the same data organisation challenge under time pressure, with a client relationship on the line.

Frequently Asked Questions

Why is my client asking for my carbon emissions data?

If your client is an SGX-listed company or a multinational, they are required to report their Scope 3 emissions — the emissions in their value chain, including from suppliers. Under GHG Protocol and IFRS S2, your Scope 1 and Scope 2 emissions become their Scope 3 Category 1 (Purchased Goods and Services). To complete their own sustainability disclosure accurately, they need your data. As SGX Scope 3 requirements tighten toward FY2030, these requests will become more frequent and more rigorous.

What is Scope 3 Category 1 and how does it relate to my business?

Scope 3 Category 1 covers the emissions associated with producing the goods and services a company buys from its suppliers. When your client purchases from you, your own Scope 1 and Scope 2 emissions are embedded in what they bought. Your client must include those emissions in their Scope 3 Category 1 calculation. The more credible and documented your Scope 1+2 data, the more accurate their disclosure — and the less likely they are to use conservative estimates that may overstate your emissions footprint.

Do Singapore SMEs have to report carbon emissions for supply chain purposes?

Singapore SMEs are not legally required to report carbon emissions — mandatory requirements currently apply only to SGX-listed companies. However, the commercial obligation is real: if your clients need your emissions data for their own mandatory disclosures, not providing it puts the supplier relationship at risk. Some procurement processes now score suppliers on ESG compliance alongside price. Being unable to provide a credible, documented Scope 1+2 number is increasingly a competitive disadvantage.

What does a supplier need to provide for their client's sustainability report?

Typically: your Scope 1 and Scope 2 emissions for the relevant period (usually the most recent full calendar year), in tonnes of CO2 equivalent (tCO2e). You should also document the methodology used (GHG Protocol or ISO 14064-1), the emission factor source (Singapore's EMA grid emission factor for electricity; IPCC factors for fuel combustion), and your organisational boundary. For larger client requests, you may need to provide supporting documents — utility bills, fuel receipts — so the client's assurer can verify the numbers.

How do I respond to a supply chain carbon questionnaire?

The most defensible response includes: a documented Scope 1+2 emissions figure (not a rough estimate), the methodology used to calculate it, the emission factor sources, and your reporting boundary. Start with 12 months of utility bills (Scope 2 electricity) and fuel purchase records (Scope 1 combustion) — for most Singapore SMEs, these cover 80–95% of total Scope 1+2 emissions. Structured reporting tools make this significantly faster and produce an output your client's sustainability team can use directly.

Build Your Emissions Data Before the Next Questionnaire Arrives

VerityOS gives Singapore SMEs a structured, audit-ready way to capture Scope 1 and Scope 2 evidence from utility bills and fuel records, calculate emissions with version-controlled factors, and produce a methodology-documented summary your clients can use in their own disclosures.

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