South Africa is moving toward mandatory sustainability reporting through a phased, multi-regulator process. The Companies and Intellectual Property Commission (CIPC) added a voluntary sustainability disclosures module to its XBRL taxonomy in October 2024, aligned with ISSB's IFRS S1 and S2 standards. In January 2025, the CIPC published Notice 6 of 2025 opening public consultations on implementing mandatory sustainability reporting obligations, with the Department of Trade, Industry and Competition (DTIC) and CIPC establishing a steering committee to oversee a regulatory impact assessment. A mandatory XBRL-based ESG reporting requirement for public and state-owned companies began phasing in from the 2025-26 financial year. Full mandatory ISSB-aligned reporting for the broader market remains under active consultation, not yet enacted. The regulatory direction is clear. The pace of implementation is measured, and it is outrunning the readiness of most companies it will eventually reach.

The 2025 Alexforbes-CIPC Sustainability Reporting Sentiment Survey drew on responses from across the South African market and found that only 28.4% of organizations feel ready to comply with anticipated mandatory reporting requirements. Among Johannesburg Stock Exchange-listed companies analyzed across 2020 and 2021, the most recent period for which a broad assurance study has been conducted, only 19.6% had obtained independent third-party assurance on ESG disclosures. That historical figure reflects a structural gap that has not materially closed. The distance between where most South African companies are on data infrastructure and where a credible mandatory disclosure regime would need them to be is significant.

What Is Breaking Down in Practice

WWISE's work across more than 750 organisations in 16 countries, including South Africa, identified five recurring challenges that weaken ESG reporting:

  • Inconsistent data collection tracked manually or across siloed systems with no alignment to global frameworks
  • Limited ESG-literate personnel to design and manage reporting processes
  • Regulatory uncertainty about how quickly to invest in readiness
  • Superficial integration of ESG into governance and operations
  • Absence of independent assurance preparation.

These are not edge-case problems affecting a handful of companies. They describe the modal South African company attempting to meet a mandatory disclosure requirement in 2025.

The Assurance Problem Is Also a Capacity Problem

A 2024 PwC study found that 62% of global investors now require third-party assurance of ESG data, and 57% have walked away from deals due to concerns about ESG transparency. South Africa's historical assurance rate of under 20% for listed companies, drawn from the most recent broad study covering the 2020-2021 period, sits well below that investor expectation and well below the assurance rates common in the UK, EU, and Australia, where mandatory assurance requirements have been building for years.

Part of the gap is demand: South African companies have historically treated assurance as optional. Part of it is supply. Grant Thornton's July 2025 analysis of IFRS S1 and S2 readiness across Africa identified limited technical capacity within both regulators and reporting entities, insufficient awareness of the standards, and a lack of reliable sustainability data and reporting systems as the defining challenges. The pool of auditors with the sustainability assurance expertise to conduct engagements at the standard the CIPC framework implies is not large enough to serve the volume of companies that now have disclosure obligations. That capacity constraint does not resolve quickly.

The Just Transition Dimension That Investors Are Underweighting

South Africa's disclosure challenge has a dimension that distinguishes it from the assurance gaps in Singapore or the Netherlands. South Africa is one of the world's most carbon-intensive economies, heavily dependent on coal for electricity generation, and navigating a just transition that has to balance decarbonization with employment preservation in mining-dependent communities. The Climate Change Act's carbon budgets apply to large emitters in exactly those sectors. The quality of the emissions data those companies produce is not just a capital markets question, it determines whether carbon budget compliance can be assessed, enforced, or planned around.

When the underlying data is unreliable, the regulatory regime built on top of it loses its enforcement capacity. Carbon budgets set against imprecise emissions inventories produce compliance assessments that cannot be trusted. Investors pricing transition risk in South African industrial assets are working from the same imprecise figures. The data problem and the policy problem are the same problem, and neither resolves without investment in measurement infrastructure that most companies in the sector have not yet made.

What the Readiness Gap Means for International Capital

South Africa's ESG investing market is expected to grow at a compound annual growth rate of 17.5% between 2025 and 2030, according to Grand View Research. International capital increasingly conditions on credible disclosure. As London School of Economics Africa researchers observed in November 2025, disclosure in South Africa remains patchy, leaving gaps in readiness for the global transition precisely at the moment when access to international sustainable finance depends on being able to demonstrate credible ESG performance. The regulatory framework is in place. The data infrastructure that gives it credibility is still being built, and most of that building is behind schedule.