Sustainability Reporting for Financial Services
Financed Emissions, PCAF Methodology, and UK SRS Requirements
The Financed Emissions Challenge
For financial institutions, Scope 3 Category 15 (financed emissions) typically represents95-99% of total emissions
Unlike other sectors where operational emissions dominate, financial services face a unique challenge: the emissions from their lending, investment, and insurance activities dwarf their direct footprint by orders of magnitude.
A typical UK bank's financed emissions can be 700x larger than their Scope 1 & 2 combined.
Regulatory Landscape
- UK SRS: Proposed mandatory from 2027 for listed financial institutions
- TCFD: Already mandatory for large banks and insurers
- PRA SS3/19: Climate risk management requirements
- FCA ESG: Sustainability Disclosure Requirements (SDR)
PCAF Methodology for Financed Emissions
The Partnership for Carbon Accounting Financials (PCAF) provides the global standard for measuring and reporting financed emissions.
| Asset Class | Attribution Factor | Emission Factor | Data Quality (1-5) |
|---|---|---|---|
| Listed Equity & Bonds Shares and corporate bonds | Outstanding amount / EVIC (Enterprise Value Including Cash) | Company emissions (Scope 1, 2, 3) | 1-2 |
| Business Loans Corporate lending | Outstanding amount / (Total equity + debt) | Borrower emissions or sector averages | 2-4 |
| Commercial Real Estate Property loans | Outstanding amount / Property value at origination | Building emissions (actual or estimated) | 2-4 |
| Mortgages Residential property | Outstanding amount / Property value at origination | Energy consumption × grid factor | 3-5 |
| Motor Vehicle Loans Auto finance | Outstanding amount / Vehicle value | Distance × emission factor by vehicle type | 3-4 |
| Project Finance Infrastructure | Outstanding amount / Total project equity + debt | Project emissions (annual) | 1-3 |
PCAF Data Quality Scoring
Verified emissions data
Unverified emissions data
Sector averages
Proxy data
Economic estimates
UK SRS Requirements for Financial Services
Climate Disclosures (S2)
- Financed emissions baseline: Full Scope 3 Category 15 measurement using PCAF
- Sectoral targets: Emissions reduction targets for high-carbon sectors in portfolio
- Climate scenario analysis: Physical and transition risk assessment of lending book
- Green finance metrics: Sustainable lending and investment volumes
Implementation Timeline
2027 (Proposed)
Listed banks, insurers, asset managers begin UK SRS reporting
2028
Large private financial institutions likely included
2029
Full Scope 3 mandatory (currently comply-or-explain)
Note: PRA-regulated firms already report under TCFD. UK SRS builds on this foundation.
Implementation Roadmap
Portfolio Assessment
- Map lending and investment portfolio by asset class
- Identify data availability and quality gaps
- Prioritise high-emission sectors
- Establish PCAF baseline
Data Collection & Systems
- Implement client emissions data collection
- Integrate ESG data providers
- Build calculation infrastructure
- Establish data governance
Target Setting
- Set portfolio decarbonisation targets
- Define sectoral pathways
- Align with net-zero commitments
- Develop transition finance strategy
Reporting & Assurance
- Produce UK SRS disclosures
- Third-party verification
- Stakeholder communication
- Continuous improvement
Common Challenges & Solutions
Data Availability
Challenge: SME clients rarely report emissions; private companies lack disclosure.
Solution: Use PCAF hierarchy - start with sector averages (Score 4-5), improve over time through client engagement and questionnaires.
Double Counting
Challenge: Same emissions counted by multiple financial institutions.
Solution: Follow PCAF attribution rules strictly. Focus on portfolio decarbonisation rate rather than absolute emissions.
Target Setting
Challenge: Setting credible targets while maintaining commercial objectives.
Solution: Use SBTi Financial sector guidance, focus on engagement targets for high-emitting sectors, develop transition finance products.
Systems Integration
Challenge: Emissions data sits outside core banking systems.
Solution: Build API connections to ESG data providers, integrate climate metrics into credit decisions, automate PCAF calculations.
Expert Support for Financial Services Sustainability Reporting
Navigate financed emissions, PCAF methodology, and UK SRS requirements with confidence