The Science Based Targets initiative (SBTi) is the global blueprint for corporate climate action, establishing the gold standard by which businesses align their greenhouse gas (GHG) reduction goals with the Paris Agreement to limit global warming to 1.5 degrees.
With the release of the SBTi Corporate Net-Zero Standard Version 2.0, the framework has undergone its most comprehensive overhaul to date. The structural focus has officially shifted from mere target-setting and pledge-making to credible, verifiable implementation.
While the SBTi remains a voluntary framework and is not directly written into UK law, its regulations are deeply interwoven into national legislation and business practices. The UK government uses the SBTi framework as a trusted benchmark to measure compliance with the Climate Change Act 2008 (which legally binds the UK to net zero by 2050 and an 81% reduction by 2035). Furthermore, it serves as the audit-proof mechanism to satisfy mandatory legal reporting rules like the Sustainability Disclosure Requirements (SDR).
The framework also cascades down from large corporations directly into their supply chains. As a major part of sustainability planning focuses on suppliers – or Scope 3 emissions – companies are increasingly requiring their upstream and downstream partners to meet these criteria as a commercial condition of doing business.
Who Qualifies? The New Categorisation Rules
Version 2.0 introduces a rigid, dual-tiered classification system that dictates a company’s exact compliance requirements. Organisations are split into two distinct tiers:
Category A
This category faces the most stringent mandates, including compulsory, independent third-party assurance for greenhouse gas inventories and key metrics.
An organisation is automatically classified under Category A if it meets the following criteria:
- Net Turnover: Greater than €450 million
- Workforce: Greater than 1,000 full-time employees
The Supply Chain – Medium Sized Companies
Crucially for the UK market, the regulation cascades directly into supply chains. Medium-sized companies operating in high-income regions like the UK will also fall under Category A requirements if they act as part of a larger corporation’s supply chain and meet at least one of the following financial or operational markers:
- Balance Sheet: Greater than €25 million
- Net Turnover: Greater than €50 million
- Workforce: Greater than 250 full-time employees
The Two Most Critical Changes in Version 2.0
1. Baseline year transparency
Under the original net-zero standard, companies were permitted to select a fixed historical baseline year from the distant past to calculate their emission reductions. While this was a useful starting point, it allowed companies to select a baseline year from the distant past.
Version 2.0 tightens this entirely. The target base year must now be the most recent year for which a company has a comprehensive emissions inventory, ideally aligning directly with its financial reporting period. This guarantees that reduction targets reflect the current, operational reality of the business rather than a legacy snapshot.
2. The 5% Materiality Rule for Scope 3 Emissions
The old standard forced companies to set a single blanket target covering 67% of their entire Scope 3 footprint, which often resulted in firms omitting hard-to-measure areas with massive climate impact.
Version 2.0 replaces this with a strict significance- and materiality-based boundary approach. Category A corporations must explicitly target any individual supply chain category that accounts for more than 5% of their total Scope 3 footprint or any Emissions-Intensive Activities (EIAs). Broad industry averages are no longer acceptable; companies must secure validated, primary data directly from their networks to survive independent third-party verification.
The Implementation Timeline: Act Now
The transition window is closing, and businesses must map their compliance timelines immediately:
- Now (2026): Companies can still submit, update, or renew targets under the legacy Version 1.3.1 framework to utilise previous flexibilities.
- 1 February 2027: Target validation under Version 2.0 formally opens via the online submission portal.
- 1 February 2028: Version 1.3.1 is retired completely. All new corporate submissions and mandatory five-year reviews must strictly adhere to Version 2.0 rules.
Move Beyond Manual Spreadsheets with Achilles
To successfully adapt to Version 2.0, UK organisations must move away from manual spreadsheets and self-reported surveys. While the SBTi determines the framework, defines the categories, and mandates verification, the SBTi does not perform the audits themselves. Under Version 2.0, Category A companies face mandatory independent audits; a single unvetted supply chain category can cause your entire SBTi submission to fail.
As an accredited independent third party with over 18 years of global leadership in greenhouse gas verification, Achilles provides the exact auditing and data assurance you need. Our carbon verification and reduction programmes are fully compliant with internationally recognised assurance standards and trusted by governments, certification bodies, and regulators alike. We do not just offer software; we provide the definitive, audit-ready stamp of assurance that future-proofs your organisation against compliance failure.
