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IFRS S1 and S2: What They Mean for a Small Firm

Walk into a bank meeting to renew a credit line these days and you may come out with homework: the credit officer wants to know your climate risks, your emissions and your reduction plan. The reason is less mysterious than it feels. Many banks now report under IFRS S2 themselves, and they need data from their borrowers to do it.

Nobody is going to make a 15-person workshop file IFRS S1. But the standards are becoming the grammar of sustainability data, and your business will be asked to speak it. The short version follows.

What the standards are

IFRS S1 and S2 were issued by the International Sustainability Standards Board (ISSB) in 2023. S1 sets the general requirements for sustainability-related financial disclosures. S2 is the climate standard. Both are built on the TCFD framework and organised around four pillars: governance, strategy, risk management, and metrics and targets.

They're written for capital markets — listed companies and their investors. So if you're unlisted and small, the standards don't apply to you directly. That's the end of the legal analysis and the beginning of the practical one.

Why they still matter to you

Three reasons:

  1. Your lenders and investors are in scope. Banks, insurers and funds that must disclose their own climate exposure need data from their portfolios. You're in someone's portfolio, so their data problem becomes your questionnaire problem.
  2. Your customers are in scope. A listed retailer reporting Scope 3 emissions under S2 needs supplier emissions data. You're the supplier.
  3. Jurisdictions are adopting them. The UK, Japan, Australia, Canada, Singapore and others are aligning national rules with the ISSB standards. In the EU, the CSRD and ESRS apply instead — we covered those in this guide — and the ISSB and EU frameworks have an official interoperability mapping, so one dataset can serve both regimes.

What you actually need to build

Strip S1 and S2 down to what a small firm can realistically produce, and it's four things:

A greenhouse gas inventory. Scope 1 (what you burn and emit directly), Scope 2 (electricity you buy), and the Scope 3 categories your customers ask about — usually purchased goods for manufacturers. The GHG Protocol is the underlying method. For most small firms this is a spreadsheet built from energy bills, fuel cards and supplier data, not a project.

A risk description. Three paragraphs: how climate affects your business (floods near your warehouse? heat stress for your farmers? carbon pricing on your inputs?) and how your business affects the climate. Governance follows: who's responsible, and it's probably the founder.

A target. Something numeric and dated — "30% lower Scope 1+2 by 2030" beats "we care about the planet." If you want the number externally validated, the SBTi runs an SME route built exactly for companies like yours, with a simplified process and a one-off validation fee.

A number that updates. Lenders and buyers don't just want the data; they want it current. An emissions number that's two years stale reads as a risk signal, not a disclosure.

Don't buy software yet

The first instinct of a small team facing IFRS-shaped questionnaires is to buy a reporting tool. Resist. Enterprise ESG software is priced for enterprises and built for reporting regimes you don't have. At your size, the bottleneck is data collection, not formatting — and a well-structured spreadsheet plus a public page gets you to the same answer. If you do outgrow it, we compared options in our ESG software buyer's guide.

The ISSB standards matter to small firms the way accounting standards matter to small firms: you don't file under them, but everyone you borrow from and sell to does. Speak the language — one inventory, one risk paragraph, one target, kept current — and the questionnaire war mostly goes away. Publish the result at company level: one live page for the inventory, one for the target, assembled with your GDPR record and insurance summary into a single trust page a lender can click through in five minutes. That's the Sustalium model — company-level documents at €10 each, organised in a Trust Hex — and your bank meeting goes from homework assignment to five-minute walkthrough.

How Sustalium Helps with Lender and Buyer Questions

  • Company-level pages — your emissions inventory, risk description and target live as public, dated documents, not email attachments.
  • One Trust Hex — assemble them with your GDPR record, insurance summary and other company documents into a single page lenders can click through.
  • Updates stay simple — when your numbers change, update the page once and every questionnaire gets the current version.

Answer the Bank Before the Meeting Starts

Publish your climate data as living company-level documents in one verifiable Trust Hex. Start structuring your data free and publish the verified asset when you are ready.

See the Trust Hex in Action →

Frequently Asked Questions

Do IFRS S1 and S2 apply to unlisted SMEs?

Not directly — they're written for capital markets. They reach you through lenders, investors and customers whose own disclosures need your data.

IFRS S2 or CSRD/ESRS?

In the EU, CSRD and ESRS are the legal regime; IFRS S1/S2 are the global capital-markets baseline. The frameworks have an official interoperability mapping, so one dataset serves both.

What do I need first?

A greenhouse gas inventory (Scope 1, 2 and the Scope 3 categories customers ask about), a short risk description, and a numeric target. For most small firms that's a weekend of spreadsheet work.

Last updated: September 11, 2026

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