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  1. Chapters
  2. Target Base Year Assessment
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Science Based Targets Initiative

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Target Base Year Assessment

Background: This chapter establishes the foundational requirements for determining a company’s target base year emissions and associated required metrics under the SBTi Standards. The process begins with defining organizational and operational boundaries, which ensure that all subsequent calculations and targets accurately reflect the company’s structure and activities.

Target setting operates in defined cycles. For each new target cycle, a company is required to select the most recent year with comprehensive data as the target base year for near-term targets. This reflects changes in company structure and emissions over time and aligns with SBTi target-setting methods that determine ambition based on a company’s current emissions profile rather than historical base year emissions. Updating the target base year represents a continuation, not a reset, of the decarbonization journey: the company is expected to demonstrate continued progress across successive target cycles.

The chapter further sets out requirements for preparing a comprehensive GHG emissions inventory aligned with the GHG Protocol Standards, calculating required metrics such as low-carbon electricity (LCE), identifying emissions-intensive activities (EIAs), and applying third-party assurance. Together, these provisions provide the technical and governance foundations for credible cycle-based target setting and progress tracking.

2.1 Organizational & operational boundaries

Intent

To establish clear and comprehensive organizational and operational boundaries as the foundation for the consistent application of all SBTi Standards, including Sector Standards, and for setting, tracking, and assessing progress against targets.

CNZS-C3
Companies shall define organizational and operational boundaries to which all applicable SBTi Standards criteria shall be applied.
Assessment stage
Target Validation
Company category
All companies

2.2 Selecting a target base year

Intent

To ensure that, at the start of each target cycle, companies select a target base year that reflects their current organizational structure and emissions profile. This aligns with SBTi target-setting methods, which determine ambition based on current emissions rather than historical base years, while maintaining accountability and building on achieved emissions reductions.

CNZS-C4
Companies shall select a target base year that accurately reflects the company’s structure and activities.17
Assessment stage
Target Validation
Company category
All companies

2.3 Target base year GHG inventory

Intent

To ensure companies establish a robust and transparent foundation for credible target setting and end-of-cycle progress assessment by accounting for and reporting a base year GHG inventory aligned with the GHG Protocol and other target-setting metrics.

CNZS-C5
Companies shall account and report a GHG emissions inventory aligned with the GHG Protocol Standards.
Assessment stage
Target Validation
Company category
All companies

2.4 Identification of EIAs

Intent

To ensure that the most emissions-intensive value chain activities are explicitly visible and addressed through targets or transition planning, the identification and quantification of EIAs is required separately from broader scope 3 categories, with dedicated target-setting options available under CNZS-C15.

CNZS-C6
Companies shall identify and quantify emissions from emissions-intensive activities (EIAs) within their value chains.
Assessment stage
Target Validation
Company category
Category A
Category B (optional)

2.5 Third-party assurance

Intent

To strengthen the credibility and reliability of the target base year GHG emissions inventory and related calculations through independent third-party assurance. Assurance is required for Category A companies and strongly encouraged for Category B companies as a key mechanism to enhance transparency and confidence in reported emissions.

CNZS-C7
Companies shall obtain independent third-party assurance of the target base year GHG emissions inventory and associated required metrics.
Assessment stage
Target Validation
Company category
Category A
Category B (optional)

2.6 Target base year recalculation

Intent

To ensure that target base year emissions and associated required metrics remain accurate, representative, and comparable over time by requiring recalculation in response to material structural or methodological changes.

CNZS-C8
Companies shall recalculate their target base year GHG emissions inventory and associated required metrics in response to significant changes.
Assessment stage
Target Validation (revalidation)
Company category
All companies