Best practice ESG reporting software

ESG Reporting Best Practices for 2026 and Beyond

The regulatory ground beneath sustainability reporting is shifting fast — and the companies that treat 2026 as a compliance milestone rather than an ongoing transformation will find themselves perpetually catching up.

CSRD is now a live obligation for thousands of companies. Wave 1 (large public-interest entities) began reporting in 2025. Wave 2, effective from January 2026, brings large undertakings into scope — roughly 20,000 additional EU companies, plus non-EU subsidiaries with significant EU operations. Wave 3 follows in January 2027, extending to listed SMEs, small credit institutions, and captive insurance undertakings. Each wave applies the full European Sustainability Reporting Standards (ESRS), including double materiality assessments and limited assurance from an independent verifier.

Beyond Europe, the landscape is converging. The ISSB’s IFRS S1 and S2 standards are gaining traction as the global baseline, with jurisdictions from Singapore to Brazil adopting or aligning with them. In the UK, the Sustainability Disclosure Standards (SDS) — built on ISSB foundations — are expected to become mandatory under a phased timeline starting in 2027 for the largest UK companies. The SEC’s climate disclosure rules in the US remain in flux following legal challenges, but the direction of travel is clear: investors and regulators everywhere expect structured, auditable climate and sustainability data.

What does best practice look like in this environment? It means building reporting infrastructure that can adapt as frameworks evolve — not reconfiguring spreadsheets each time a new standard lands. It means capturing data once and mapping it across CSRD, ISSB, GRI, and TCFD requirements simultaneously. And it means maintaining a continuous audit trail that satisfies both your board and your assurance provider.

Horizon ESG is built for exactly this trajectory. The platform tracks regulatory updates across frameworks and surfaces the specific disclosure requirements that apply to your organisation, so your team stays ahead of compliance deadlines rather than reacting to them. Learn more about CSRD compliance requirements or explore our guide to ESG reporting best practices.

Why Spreadsheets and Manual Processes Fall Short

Most mid-market sustainability teams start with spreadsheets. It makes sense — they are familiar, flexible, and free. But there is a point where that flexibility becomes a liability, and for companies entering CSRD scope, that point has arrived.

The core problem is not that spreadsheets cannot hold ESG data — they can. The problem is that they cannot enforce the governance, traceability, and multi-framework alignment that CSRD demands. When your assurance provider asks to trace a Scope 3 figure back to its source data, or when ESRS E1 requires you to demonstrate how your climate targets connect to your financial planning, a spreadsheet will not give you a defensible answer.

For mid-market companies, the transition from spreadsheets to purpose-built software is not about luxury — it is about audit-readiness. Read more about moving beyond spreadsheets for ESG data management.

A Complete Sustainability Reporting Solution for Every Framework

One of the most time-consuming aspects of sustainability reporting is duplicating effort across frameworks. Your carbon data feeds into your CSRD disclosure under ESRS E1, your TCFD reporting under Metrics and Targets, your GRI report under GRI 305, and your SECR submission. Without a unified system, your team enters the same data multiple times, reformats it for each framework, and then reconciles discrepancies across documents.

Horizon ESG eliminates this duplication through single-entry, multi-framework data architecture. You input your sustainability data once, and the platform maps it to every applicable standard.

Frameworks supported:

• CSRD / ESRS — Full alignment with the European Sustainability Reporting Standards, including topical standards (E1-E5, S1-S4, G1), cross-cutting standards (ESRS 1 and 2), and double materiality assessment support. Disclosure checklists, gap analysis, and formatted outputs ready for limited assurance.
• GRI Standards — Comprehensive coverage of GRI Universal, Sector, and Topic Standards, with automatic cross-referencing to your ESRS disclosures where the two frameworks overlap.
• TCFD (transitioning to ISSB) — Structured reporting across Governance, Strategy, Risk Management, and Metrics & Targets. As the TCFD framework transitions to the ISSB, Horizon maps your existing TCFD disclosures to the corresponding IFRS S1 and S2 requirements.
• ISSB (IFRS S1 / S2) — Ready for jurisdictions adopting the ISSB baseline, including alignment with the forthcoming UK Sustainability Disclosure Standards.
• SECR — Streamlined Energy and Carbon Reporting for UK-registered companies, drawing directly from your Scope 1 and 2 calculations.
• SFDR — Principal Adverse Impact indicators and product-level disclosures for financial market participants.

This cross-framework intelligence means your sustainability team works from a single source of truth. When a framework updates — as ESRS will through delegated acts, and as ISSB will through sector-specific standards — your existing data maps forward automatically.

Explore our dedicated pages on CSRD compliance, TCFD reporting, and GHG Protocol methodology.

The All-in-One ESG Platform Your Team Actually Uses

Sustainability software only delivers value if your team actually uses it. Too many platforms are built for consultants or IT teams — packed with features that require specialist training and produce outputs that still need manual reformatting before they reach a board pack.

Horizon ESG is designed for the sustainability manager who needs to collect data from operations, finance, procurement, and facilities — often from colleagues who consider ESG reporting a secondary responsibility. The platform is built around three principles that drive real adoption:

Role-based access that matches your organisation. Not everyone needs to see everything. Data contributors see only the input forms relevant to their department. Sustainability leads get a full dashboard view with gap analysis and progress tracking. Finance and board stakeholders access summary reports and KPI dashboards. Permissions are granular enough to reflect your actual reporting structure without creating administrative overhead.

Automated data collection that reduces the email chase. The most time-consuming part of ESG reporting is often the least technical: chasing colleagues for utility bills, travel records, and procurement data. Horizon automates data requests with structured collection forms, reminders, and validation checks at the point of entry — so data arrives clean and on time, rather than in a last-minute email attachment.

A single platform replacing multiple tools. Before Horizon, a typical mid-market sustainability workflow involves spreadsheets for calculations, email for data collection, a consultant for framework interpretation, a separate tool for carbon accounting, and PowerPoint for board reporting. Horizon consolidates these into a single environment where data flows from collection through calculation to disclosure without manual handoffs.

The result is a platform that sustainability managers can own and operate independently — without relying on IT support or external consultants for day-to-day reporting tasks. See how AI automation further reduces manual effort across your reporting workflow.

Data Security and Compliance

ESG data is commercially sensitive. Your emissions figures, energy consumption records, and pre-publication sustainability disclosures represent material non-public information that requires the same level of protection as financial data.

Horizon ESG is built on a security-first architecture:

• GDPR compliant — Full compliance with the UK GDPR and EU GDPR, including data processing agreements, data subject access request handling, and lawful basis documentation.
• Encryption — Data encrypted in transit (TLS 1.2+) and at rest (AES-256). Database backups are encrypted and stored in geographically separate locations.
• Hosting — Hosted on secure cloud infrastructure within European data centres, ensuring data residency requirements are met for UK and EU clients.
• Access controls — Role-based access with multi-factor authentication, session management, and detailed access logs. Administrators control exactly who can view, edit, and approve data at the entity and module level.
• Audit logging — Every data change is logged with timestamps and user attribution, supporting both internal governance and external assurance requirements.

Your sustainability data deserves the same rigour you apply to financial reporting infrastructure. Horizon is built to deliver that standard.