TSRS enters the final stretch: Reliefs end in 2027. Are you ready?

Since 2024, sustainability reporting in Türkiye has been mandatory for companies above a certain size. The Public Oversight Authority (KGK) decisions published in the Official Gazette on 22 October 2026 have clarified the path ahead: some reliefs have been extended for 2026 reports, but 2027 will be the year of full compliance. Companies are now entering the final phase of the transition. The time to prepare is now.

Who is in scope?

For financial years beginning on or after 1 January 2025, the Turkish Sustainability Reporting Standards (TSRS) apply to entities that meet at least two of three thresholds for two consecutive reporting periods: total assets of TRY 1 billion, annual net sales of TRY 2 billion and 500 employees. Banks and certain financial institutions must report regardless of these thresholds. The Board Decision of 13 January 2026 raised the thresholds, focusing the scope on large enterprises.

Which reliefs remain available for 2026 reports?

The decisions of 22 October 2026 extended three transitional provisions:

• Publication timing remains flexible. Sustainability reports may be published after financial reports. For companies required to issue interim reports, the deadline is the end of the filing period for their 2027 half-year reports; for companies without this obligation, it is 30 September 2027.
• Climate-only reporting remains an option. Companies that have so far applied TSRS 1 solely in relation to TSRS 2 climate-related disclosures may continue to do so in their 2026 reports.
• More time for comparative information. Companies using this exemption in 2026 will not be required to provide comparative information on non-climate sustainability risks and opportunities in their 2027 reports.

These reliefs do not remove the reporting obligation; they provide flexibility in scope and timing. Financial institutions face a different situation: the option to report Scope 3 financed emissions voluntarily ended on 1 January 2026. The standard requirements now apply in this area as well.

What changes in 2027?

For most companies, 2027 reports will effectively mark the end of the transition period. Non-climate risks and opportunities across environmental, social and governance matters will require much broader disclosure, alongside more demanding comparative information requirements.

Assurance, meanwhile, has been mandatory from the first year. The sustainability assurance standard SGDS 5000 is expected to apply to assurance engagements for periods beginning on or after 15 December 2026. Data quality, internal controls and documentation are therefore essential elements of the assurance process.

Preparing for 2027: six actions to take now

• Clarify which exemptions you use. Are you reporting solely on climate in 2026, or applying TSRS 1 in full?
• Build the infrastructure for non-climate data now. Define data collection processes for water, waste, human resources, the supply chain and governance indicators.
• Include Scope 3 emissions in your measurement processes. This is now a priority for financial institutions.
• Prepare internal controls for assurance. Bring your controls and documentation to a level that can withstand an assurance practitioner's scrutiny.
• Align your publication schedule with financial reporting. This flexibility may no longer be available in 2027.
• Define the board's role. TSRS calls for reporting that is integrated with strategy and risk management, placing the issue firmly on the senior leadership agenda.

In 2027, a superficial approach to reporting will no longer be enough. For companies using transitional reliefs, this is the final opportunity to establish a comprehensive, comparable reporting system that is ready for assurance. Companies that prepare early can reduce assurance risk and strengthen their standing with investors, banks and regulators.