ISO 14064 Singapore 2026: Greenhouse Gas Reporting & Verification — The Complete Guide

ISO 14064 is the international standard for measuring, reporting and verifying greenhouse gas (GHG) emissions. In Singapore it has moved from a nice-to-have to the backbone of a legal obligation: since FY2025, every company listed on the Singapore Exchange (SGX) must report its Scope 1 and Scope 2 emissions, with Scope 3 and independent assurance phasing in over the next few years. This guide explains what the standard requires, who is affected by Singapore’s climate reporting mandate, what government funding is available, and how the verification process works.

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What is ISO 14064?

ISO 14064 is a three-part family of standards published by the International Organization for Standardization:

• ISO 14064-1 — how an organisation designs, develops and reports its greenhouse gas inventory: setting organisational and reporting boundaries, quantifying Scope 1, 2 and 3 emissions, and documenting the methodology. This is the part most Singapore companies need first.
• ISO 14064-2 — how to quantify emission reductions from specific projects (for example an energy-efficiency retrofit or fuel switch), typically used for carbon credit programmes.
• ISO 14064-3 — how an independent third party verifies a greenhouse gas statement and issues a verification opinion, at either limited or reasonable assurance.

A useful way to remember it: Part 1 is the report card, Part 3 is the examiner. Your organisation (usually with a consultant) prepares the GHG inventory under Part 1; an accredited verification body checks it under Part 3.

Singapore’s climate reporting mandate: who must report, and when

Singapore’s climate-related disclosure regime is set by the Accounting and Corporate Regulatory Authority (ACRA) and Singapore Exchange Regulation, aligned to the International Sustainability Standards Board (ISSB) standards. The current timeline:

Two practical consequences follow. First, every listed company is already producing GHG numbers — many on hastily built spreadsheets. Second, from FY2029 an independent assurance provider must sign off on those numbers. Inventories that were not built on a recognised methodology tend to fail that examination and have to be rebuilt. Building to ISO 14064-1 from the start avoids paying twice.

Separately, facilities emitting 25,000 tCO2e or more of direct emissions annually are taxable facilities under the Carbon Pricing Act and must submit independently verified emissions reports to the National Environment Agency — with the carbon tax at S$45 per tonne for 2026–2027, rising further by 2030.

What ISO 14064-1 actually requires

An ISO 14064-1 GHG inventory involves six building blocks:

1. Organisational boundary — which entities, sites and operations are inside your inventory (equity share, financial control or operational control approach).
2. Reporting boundary — classifying emissions as direct (Scope 1), imported energy (Scope 2) and other indirect (Scope 3), and justifying which indirect categories are significant.
3. Quantification — activity data (fuel purchased, electricity consumed, refrigerant top-ups, waste, travel) multiplied by recognised emission factors, for Singapore typically the Energy Market Authority grid emission factor for electricity plus internationally recognised fuel and material factors.
4. Base year — a reference year against which future performance and reduction targets are tracked, with a recalculation policy.
5. Documentation — an inventory report covering methodology, data sources, assumptions, exclusions and uncertainty, written so a verifier can retrace every number.
6. Internal controls — data collection procedures and responsibilities so the inventory is repeatable every year, not a one-off heroic effort.

The five principles running through all of it: relevance, completeness, consistency, accuracy and transparency.

How ISO 14064-3 verification works

Verification is performed by an independent, accredited verification and validation body — never by the consultant who built the inventory (that would be marking your own homework). The typical sequence:

1. Scoping — the verifier agrees the level of assurance (limited or reasonable), materiality threshold and criteria (ISO 14064-1).
2. Document review — methodology, boundaries, factor choices and the inventory report.
3. Evidence testing — sampling utility bills, fuel invoices, meter records and calculations; site visits where warranted.
4. Findings and corrections — discrepancies are raised; the inventory is corrected and re-checked.
5. Verification opinion — a signed statement that the GHG assertion is prepared in accordance with ISO 14064-1, at the agreed assurance level.

That opinion is what you show your board, your auditors, SGX, banks and customers.

Benefits: what a verified GHG inventory does for you

• Regulatory compliance — satisfies the GHG portion of SGX/ACRA climate reporting with a methodology assurance providers recognise, and makes the FY2029 assurance deadline a formality instead of a fire drill.
• A claim you can publish — “GHG inventory prepared in accordance with ISO 14064-1 and independently verified to ISO 14064-3” in your annual report, tenders and ESG questionnaires. (Note: ISO 14064 produces a verified statement, not a “certification” — companies that claim to be “ISO 14064 certified” are usually corrected by their auditors.)
• Customer and supply-chain demands — from FY2026, STI constituents must report Scope 3, which means they will ask their suppliers for emissions data. Vendors who can hand over verified numbers win that exchange — the same dynamic that made bizSAFE flow down from main contractors to subcontractors.
• Financing — banks increasingly price sustainability-linked loans and trade facilities off credible emissions data.
• A real baseline — you cannot manage or reduce what you have not measured; the base-year inventory is the starting line for any net-zero or reduction commitment.

Government funding in 2026: the real numbers

There is persistent confusion in the market about grant percentages, so here is the position as of mid-2026:

• Sustainability Reporting Grant (SRG) — supports 30% of qualifying costs, capped at S$150,000, for a company’s first ISSB-aligned sustainability report. Qualifying costs include external consultancy, assurance, software and training. Open to SGX-listed companies and Singapore companies with annual revenue of at least S$100 million. Administered by Enterprise Singapore (Business Grants Portal) and the Economic Development Board.
• SME Sustainability Reporting Programme (SME SRP) — subsidises the cost of a first sustainability report for SMEs (group turnover ≤ S$100 million or ≤ 200 employees, ≥ 30% local shareholding) through appointed providers. The subsidy is 50% for applications from 1 April 2026 to 31 October 2027 — the earlier 70% window closed on 31 March 2026. Figures of “80%” sometimes quoted in the market are out of date.
• Enterprise Development Grant (EDG) — the enhanced 70% support level for sustainability-related projects also lapsed on 31 March 2026; standard EDG support levels now apply and eligibility is assessed project by project.

Grant approval is never guaranteed — eligibility should be confirmed with Enterprise Singapore before committing.

Getting ISO 14064-ready: the practical roadmap

1. Gap and boundary workshop — decide the consolidation approach, list sites and emission sources, identify data owners (finance, facilities, HR, operations).
2. Data collection — 12 months of utility bills, fuel records, refrigerant logs, company vehicle records; templates per department make year two painless.
3. Quantification and inventory report — calculate Scope 1 and 2 (Scope 3 screening optional at this stage), document everything to ISO 14064-1.
4. Internal review — dry-run the evidence trail the way a verifier would.
5. Independent verification — an accredited body verifies to ISO 14064-3 and issues the opinion.
6. Publish and repeat annually — the numbers go into your sustainability report; the system re-runs every financial year.

For a typical single-site or few-site organisation the first cycle takes 8–14 weeks; groups with many entities take longer.

Frequently asked questions

Is ISO 14064 mandatory in Singapore?

The standard itself is voluntary — what is mandatory is climate reporting. All SGX-listed companies must report Scope 1 and 2 emissions from FY2025, STI constituents add Scope 3 from FY2026, and external assurance applies from FY2029. ISO 14064-1 is the recognised way to prepare those numbers so they survive assurance.

Can we claim to be “ISO 14064 certified”?

Not exactly — the outcome is a verified GHG statement, not a management-system certificate. The correct, and powerful, claim is that your inventory was prepared in accordance with ISO 14064-1 and independently verified to ISO 14064-3.

How is this different from ISO 14001?

ISO 14001 certifies your environmental management system; ISO 14064 quantifies and verifies your carbon numbers. They complement each other — ISO 14001 holders usually find the data collection half-built already.

We are an SME — does any of this apply to us?

Not directly yet, but indirectly very soon: listed customers reporting Scope 3 from FY2026 will ask their suppliers for emissions data, and tenders increasingly award points for it. SMEs can also tap the SME Sustainability Reporting Programme (50% subsidy via appointed providers until 31 October 2027).

What does it cost?

It depends on the number of sites, entities and emission sources, and whether Scope 3 is included. Contact us for a scoped quotation — for eligible companies the Sustainability Reporting Grant can support 30% of qualifying costs.

Start with a free consultation

Sage Shield has helped over 1,300 Singapore organisations achieve compliance certifications — from bizSAFE and ISO management systems to sector-specific accreditations. Our ISO 14064 GHG reporting service builds your emissions inventory to the standard verifiers audit against, and walks it through independent verification.

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