South Korea's New Sustainability Disclosure Standards: The Real Timeline

Global coverage of Korea's ESG disclosure regime has cited wildly different start dates over the past two years, ranging from 2026 to 2030. As of early 2026, the country finally has a settled answer, and it's later than many companies were bracing for.

What actually got finalized

Within two days in late February 2026, two separate but connected developments moved Korea's sustainability reporting framework from policy direction to concrete implementation plan. On February 25, the Financial Services Commission (FSC) released a draft roadmap for mandatory ESG disclosure. The following day, the Korea Sustainability Standards Board (KSSB) formally approved and published Korea's finalized sustainability disclosure standards.

The finalized standards consist of two parts: KSDS 1, covering general sustainability-related financial disclosures, and KSDS 2, covering climate-specific disclosures. Both are built on the ISSB's IFRS S1 and S2 frameworks, the same international baseline underpinning disclosure regimes emerging across Asia, Europe, and beyond. Notably, an originally proposed third standard, KSDS 101, meant to cover Korea-specific policy priorities beyond the ISSB baseline, was dropped from the final version, with the KSSB citing changes in the government policy environment and a desire to limit the burden on companies.

The mandatory start date, in plain terms

Under the FSC's draft roadmap, mandatory reporting begins in fiscal year 2027, with disclosures published in 2028, for KOSPI-listed companies with consolidated assets exceeding roughly KRW 30 trillion (about $20.4 billion). This is a considerably narrower and later starting point than earlier proposals that had floated a 2026 start date for companies with assets above KRW 2 trillion.

The requirement is designed to expand in stages: companies with assets above roughly KRW 10 trillion (about $6.8 billion) join in the following wave, with further expansion to smaller listed firms left open depending on how well the reporting infrastructure matures across the market.

Scope 3 gets meaningful breathing room

One of the more consequential design choices in the final standards: Scope 3 emissions, the hardest and most resource-intensive category to measure because it spans a company's entire value chain, won't be mandatory at the outset. Companies get a multi-year transition period before Scope 3 disclosure becomes required, giving even the largest KOSPI companies significant runway to build the supply-chain data infrastructure this kind of reporting demands.

Third-party assurance follows a similar logic: it remains voluntary in the initial years, with regulators signaling that mandatory assurance requirements will likely follow at a later, unspecified stage.

Why the roadmap still carries a caveat

As of the February announcement, the roadmap was a draft, not final law. Public consultation on the roadmap ran through the end of March 2026, with the FSC targeting formal finalization in April 2026. The core structure, phased thresholds, the 2028 start date for the largest companies, deferred Scope 3, is unlikely to change dramatically at this stage, but companies tracking exact compliance dates should confirm the roadmap's final, adopted form rather than relying on the February draft alone.

Why the timeline matters beyond Korea's borders

Korea's economy is unusually concentrated around large, globally integrated exporters, chaebol conglomerates and their extensive supplier networks spanning electronics, automotive, shipbuilding, and steel. Even though the KSSB regime only directly obligates the largest KOSPI-listed companies, smaller suppliers feeding into those companies should expect earlier, informal pressure. Once Scope 3 reporting eventually becomes mandatory for large Korean companies, those companies will need emissions and ESG data from their own suppliers well in advance of their own compliance deadline, which means supply-chain data requests will likely start arriving years before Scope 3 disclosure is technically required at the top of the chain.

The practical takeaway

Korea's sustainability disclosure regime is real and finalized in its substance, but its enforcement timeline is measured in years, not months. Companies with genuine 2028 exposure have meaningful lead time to build reporting infrastructure properly rather than scrambling. Companies assuming an earlier 2026 deadline based on outdated coverage should recalibrate their internal planning accordingly.