UK Sustainability Reporting Standards SME Guide

Category: Regulation | UK · Read time: 5 min

The UK just changed its sustainability reporting rules. Here's what it means for your business.

The UK Sustainability Reporting Standards — known as UK SRS — were formally published by the Department for Business and Trade on 25 February 2026. Most of the coverage since then has focused on the listed companies directly in scope. But the supply chain pressure flowing down from those listed companies means UK SMEs need to understand UK SRS now — not when it becomes mandatory for them directly.

This guide explains what UK SRS is, who it applies to, and the practical steps UK SMEs should take today.

What is UK SRS?

UK SRS stands for UK Sustainability Reporting Standards. It consists of two standards published by the UK government:

• UK SRS S1 — General Requirements for Disclosure of Sustainability-related Financial Information
• UK SRS S2 — Climate-related Disclosures

Together, they create a standardised framework for how UK companies must report on sustainability risks, opportunities, and — critically — their actual carbon emissions. The standards are based on the IFRS Sustainability Disclosure Standards (IFRS S1 and S2) published by the International Sustainability Standards Board (ISSB), bringing the UK into alignment with the approach already adopted by more than 40 countries globally.

UK SRS replaces the TCFD-aligned (Task Force on Climate-related Financial Disclosures) framework that large UK companies have been using since 2022. It is more demanding, more standardised, and more focused on financial materiality — meaning companies must disclose not just their emissions but how climate risk and opportunity affect their business financially.

Who does UK SRS apply to — and when?

The mandatory timeline is phased and currently focused on listed companies:

• 1 January 2027: UK SRS S2 climate disclosures become mandatory for UK-incorporated listed companies (FTSE 100, FTSE 250, premium and standard listed equity, listed debt). Approximately 600 companies in scope.
• 1 January 2028: Scope 3 emissions reporting on a comply-or-explain basis. First UK SRS-aligned reports published in 2028, covering FY2027 data.
• 1 January 2029: Broader UK SRS S1 sustainability disclosures on comply-or-explain basis.
• Large private companies: The government has signalled a separate consultation on whether to bring economically significant private companies and LLPs into scope via the Companies Act 2006. No confirmed timeline yet — expected consultation in late 2026.
• SMEs: Not currently subject to direct UK SRS reporting requirements.

If your business is not a listed company, UK SRS does not directly apply to you yet. But — and this is the point — it affects you through your clients.

Why UK SRS matters for SMEs right now

Here is the mechanism every UK SME in a corporate supply chain needs to understand:

Listed companies reporting under UK SRS S2 must disclose their Scope 3 emissions — the indirect emissions that occur in their value chain, including the goods and services they purchase from suppliers. That means if your business supplies products or services to a listed company, that company needs your emissions data to complete their own UK SRS disclosure.

They will ask you for it. If you cannot provide it — or if the data you provide is unstructured, unverifiable, or not traceable to a recognised methodology — you become a problem in their supply chain rather than a solution.

Research published by edie in early 2026 found that a significant proportion of UK SMEs are unprepared for new EU and UK sustainability reporting rules, despite growing pressure from supply chain partners. The gap between what large companies need and what their SME suppliers can provide is widening. The SMEs that close that gap fastest will be the ones that keep — and grow — their largest client relationships.

Beyond supply chain pressure, UK SRS voluntary adoption is also becoming a competitive signal. SMEs that can demonstrate structured, audit-ready carbon data are better positioned for:

• Government procurement tenders — PPN 006 already requires Carbon Reduction Plans for public sector contracts over £5M
• ESG-conscious investor due diligence
• Supply chain partner selection by large corporates building their Scope 3 inventory
• Green finance — banks and lenders increasingly require carbon data for SME lending decisions

UK SRS vs SECR — what's the difference?

Many UK SMEs are already familiar with SECR — the Streamlined Energy and Carbon Reporting framework that has applied to large UK companies since 2019. It's worth understanding how UK SRS differs:

	SECR	UK SRS
In force since	2019	February 2026 (voluntary); 2027 (mandatory for listed cos)
Who must comply	Large UK companies (250+ employees OR £36M+ turnover OR £18M+ balance sheet)	UK-listed companies initially; large private companies to follow
What it requires	Annual disclosure of energy use, Scope 1 & 2 emissions, intensity metric	Scope 1, 2 & 3 emissions plus how climate risk affects the business financially
Standard basis	UK Government BEIS methodology	Aligned to ISSB IFRS S1 and S2 — internationally recognised
Scope 3	Not currently mandatory	Comply-or-explain from 2028 for listed companies
SME impact	Indirect — large client requests	Indirect — larger and more detailed supply chain data requests

For UK-specific regulatory context and how GreenKPO supports SECR-aligned reporting, see our UK carbon accounting page.

What UK SMEs should do now — a practical checklist

You don't need to file a UK SRS report. But you do need to be ready to respond when your listed-company clients ask for your data. Here is the practical preparation path:

• Start measuring Scope 1 and 2 emissions now. These are your direct emissions (company vehicles, gas, fuel) and your purchased electricity. This is the data your clients will request first and it is the simplest to collect.
• Identify your key Scope 3 categories. For most UK SMEs the material categories are purchased goods and services, business travel, employee commuting, and logistics. You don't need to cover all 15 categories immediately — start with the biggest ones.
• Build a baseline this financial year. Two years of data makes your first formal disclosure straightforward. One year of data is better than none. Starting now means you have a clean baseline before requests arrive.
• Choose a tool that produces audit-ready, traceable output. A spreadsheet or free carbon calculator will not satisfy a listed company's Scope 3 data request. You need a platform that tags every emission to its source, applies recognised emission factors, and produces a report your client can hand to their auditor.
• Don't wait for the formal request. The SMEs that proactively send clean carbon data to their large clients before being asked will stand out. The ones that scramble to produce something when asked will create friction in a relationship that matters.

GreenKPO is built for exactly this — a UK SME-focused carbon accounting platform that produces your first audit-ready carbon report in days, not months. Most clients complete their first report within a working week of onboarding.

The bottom line

UK SRS is moving fast. The listed companies who will be required to report in 2028 are already mapping their supply chains and identifying gaps in their Scope 3 data. The SMEs in those supply chains who can respond quickly with clean, structured, auditable carbon data will be the ones that retain and grow those relationships.

Getting your emissions data structured and audit-ready now means you can respond to those requests in days rather than scrambling under pressure. And it means you are building the two-year baseline that will make your own formal reporting — when it comes — significantly simpler.

Ready to get your UK carbon data audit-ready?

Book a 30-minute walkthrough to see how GreenKPO works with your existing data. Most UK clients produce their first SECR and UK SRS-ready carbon report within a working week.

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