Voluntary reporting for SMEs & UK SRS: how the UK is replacing a taxonomy-first approach

As the UK builds out its Sustainability Disclosure Requirements (SDR) and the UK Sustainability Reporting Standards (UK SRS), small and medium-sized enterprises (SMEs) face a changing landscape. Where policymakers once considered a distinct UK “green taxonomy” to classify sustainable economic activity, the emphasis is moving instead toward standards-based disclosures (UK SRS) and lighter voluntary approaches for SMEs. As discussed during our thought leadership panel at The District Show in Barcelona earlier this year, that shift matters: it changes what information SMEs will be asked for, how comparable it will be and how companies in UK value chains will interact on sustainability data.

Background

Key elements shaping the UK’s sustainability reporting landscape today:

1. 1. SDR and UK SRS — The UK government has set out an SDR framework and is developing UK Sustainability Reporting Standards (UK SRS) (core exposure drafts were published in mid-2025. UK SRS S1 (general sustainability financial disclosures) and S2 (climate) are explicitly designed to align with international baselines while reflecting UK circumstances. These standards form the backbone of future mandatory disclosures for entities that fall into scope.
   2. Taxonomy idea (now shelved) — Policymakers had been examining a UK green taxonomy (a classification system to define what counts as environmentally sustainable activity), but in July 2025 the government response made clear it will not proceed with legislating a UK Green Taxonomy at this time. That represents a policy pivot away from introducing a UK-wide classification tool as part of SDR.
   3. Voluntary SME approaches — At EU level and via standard-setters, lighter voluntary reporting tools for SMEs (for example the VSME voluntary standard and EU recommendations) have been developed to make it easier for smaller firms to respond to information requests from larger firms in value chains. These voluntary standards aim to reduce burden while improving data comparability where possible.

What “taxonomy” would have done — and what shelving it means

A taxonomy is primarily a classification, as we explained in our first blog article here: it tells investors, lenders and regulators whether a given activity or economic asset is “green” according to set technical criteria. Taxonomies help channel capital by creating an objective label for sustainable activities. The UK government’s decision not to implement a formal UK Green Taxonomy removes one centralised classification mechanism from the toolkit — for now. Instead, the government is prioritising disclosure standards (UK SRS) and other tools to deliver transparency and comparability.

Practical implications:

• There will be less immediate emphasis on a single, official “green” label that SMEs might have to apply to projects or products.
• The focus shifts to consistent disclosure of sustainability-related financial information (risks, opportunities, metrics) which helps markets assess firms without a single taxonomy label.
• Financial actors and voluntary standards (including international taxonomies like the EU Taxonomy where relevant) will likely continue to influence capital allocation — but through information flows rather than a UK-specific classification regime.

Voluntary SME reporting vs UK SRS — how they compare

Purpose and scope

• Voluntary SME standards (e.g. VSME-style guidance) are designed for small entities, to be low-burden and to facilitate information exchange with larger companies and banks. They are intentionally proportionate and often modular.
• UK SRS aims at larger firms in scope of SDR: more comprehensive, potentially mandatory (for scoped entities), and aligned with the International Sustainability Standards Board (ISSB) baseline for investor-focused sustainability reporting. Drafts S1 and S2 set out more detailed requirements on governance, strategy, risk management and metrics.

Granularity and burden

• SME voluntary approaches emphasise simplicity, templates, and a small set of core indicators — the aim is to lower admin costs and make data flowable up supply chains.
• UK SRS expects richer disclosures (including governance and climate-related financial information). For some companies this will require new processes, data systems and assurance.

Comparability

• Voluntary SME standards improve comparability but only where broadly adopted. They’re helpful for supplier-buyer relationships and for lenders seeking basic sustainability information.
• UK SRS, if implemented across a large population of reporters, aims to deliver higher comparability and quality, but at higher cost for those in scope.

Overall Summary Table

Aspect	VSME	UK SRS
Purpose	Support small firms with simple, low-cost sustainability reporting	Provide detailed, investor-focused reporting rules for large firms
Scope	Voluntary; mainly SMEs	Likely mandatory; larger companies under SDR
Complexity	Low – uses templates and basic data points	High – requires structured reports, governance info, assurance
Comparability	Improves only if widely adopted	High comparability across firms once applied
Authority	Developed by EFRAG (EU initiative)	Developed by UK Government (DBT / HMT)
Burden	Light and flexible	Heavier reporting workload

What SMEs should do now

1. Adopt a pragmatic, staged approach. Start with the voluntary templates and core metrics that buyers or banks request (e.g. energy use, basic greenhouse gas estimates, governance and policies). This keeps data useful without over-investing.
2. Map your data flows to likely UK SRS themes. Even if a SME is unlikely to be in scope, customers that are in scope will demand upstream data, so align metrics (e.g. Scope 1–3 basics, energy intensity) to avoid duplication later.
3. Prepare for digitisation. Industry responses to consultations have emphasised digital reporting infrastructure and a digital taxonomy aligned with ISSB/ESRS for machine-readable disclosure. SMEs should consider basic digital recordkeeping to improve efficiency.
4. Engage with buyers and banks. Understand what data they accept, many will accept voluntary SME outputs as sufficient for procurement decisions or lending.

What this means for capital markets and policy

• Without a UK taxonomy, investors will have to rely more on disclosures and external frameworks (e.g. ISSB, EU Taxonomy for those operating in EU markets). That may mean more interpretative work by investors but possibly fewer immediate compliance costs for firms.
• Policy focus appears to be on standards that create comparable, decision-useful information (UK SRS) rather than a rules-based classification system. For now, the “replacement” is not a like-for-like swap but a rebalancing: from classification (taxonomy) toward standardised disclosure (SRS).

Caveats and uncertainties

The UK’s position remains dynamic: official documents and consultations continue to be published and revised. For example, exposure drafts of UK SRS were released in June 2025 and consultations were ongoing in mid-2025; the green taxonomy decision (15th July 2025) is the latest major pivot. Keep dates front and centre when reporting, so readers know which policy actions are current.

Conclusions

The UK’s move away from a formal green taxonomy and toward standards-based disclosure (UK SRS) plus continued voluntary SME instruments means less emphasis on a single “green” label and more on consistent, comparable reporting. For SMEs that supply or borrow from larger corporates, the immediate priority is to adopt practical voluntary reporting practices (the VSME-style templates), digital recordkeeping and to map data to UK SRS themes, because buyers and investors will increasingly demand decision-useful information even if formal taxonomy labels are absent.