Short answer: companies listed on the Stock Exchange of Thailand (SET) and mai must file the Form 56-1 One Report within three months of their fiscal year-end. For most Thai listed companies, whose financial year ends on 31 December, the 2026 filing deadline therefore falls at the end of March 2026 for FY2025 — and the report must be available in both Thai and English. Always confirm the exact date for your fiscal year with the SEC and SET.
What is the Form 56-1 One Report?
The 56-1 One Report consolidated the old annual registration statement (Form 56-1) and annual report (Form 56-2) into a single disclosure document. It took effect for fiscal years beginning in 2021, so listed companies have filed in the One Report format since 2022. It brings a company’s financial statements, management discussion and analysis (MD&A), corporate governance, risk factors and sustainability information together in one filing for regulators and investors.
When is the 56-1 One Report deadline in 2026?
The filing window is three months from the end of the fiscal year. Because the large majority of SET-listed companies use a 31 December year-end, their FY2025 One Report is due by approximately 31 March 2026. If your company uses a different fiscal year-end, your deadline shifts accordingly — three months after your own year-end. These are statutory timelines, so confirm the precise date with the SEC and SET for your filing.
Is an English version mandatory?
Yes. SET- and mai-listed issuers are expected to make the annual report and financial disclosures available in both Thai and English so that international investors can access them. In practice this means the entire One Report — not just the headline numbers — needs an accurate, consistent English version delivered on the same timeline as the Thai filing. See our annual report & 56-1 One Report translation service for how this is handled end-to-end.
What’s inside the One Report that needs translating
- Audited financial statements and the notes to the accounts
- The independent auditor’s report
- Management discussion & analysis (MD&A)
- Corporate governance and board structure
- Risk factors and internal control
- The sustainability / ESG section
What’s new for 2026: IFRS S1/S2 and FTSE Russell
Two shifts make high-quality English disclosure more important than ever. First, Thailand is phasing in IFRS S1 and S2 sustainability disclosures, beginning with SET50 companies from 2026 and SET100 from 2027. Second, from 2026 the SET is transitioning from its own SET ESG Ratings to FTSE Russell ESG Scores — and FTSE Russell assesses companies using publicly disclosed information only, much of it in English. A weak or late English translation of your sustainability section can directly cost you points.
How to hit the deadline with a clean bilingual report
Start the translation workstream in parallel with drafting, not after sign-off. Lock a financial terminology glossary up front so figures, account names and governance terms stay consistent. Use an ISO 17100 process (translation plus independent review) for accuracy on numbers and disclosures, and put confidentiality (an NDA, secure handling) in place from the first email, since the report is price-sensitive before release. Talk to Othello International for a quote on your One Report.
Frequently asked questions
When exactly is the 56-1 One Report due?
Within three months of your fiscal year-end. For a 31 December year-end that is around 31 March the following year.
Do I need an English version of the 56-1 One Report?
Yes — SET- and mai-listed companies make the report available in both Thai and English for investors.
Does the sustainability section need translating too?
Yes. With IFRS S1/S2 phasing in and FTSE Russell scoring from public English disclosure, the ESG section is increasingly important to translate accurately.
Related ESG guides
- Carbon Credits in Thailand 2026: T-VER, Premium T-VER and What Corporates Need to Know
- What Is ESG? A Practical Guide for Thai Companies (2026)
- CSRD After the Omnibus: What Thai Suppliers to EU Companies Actually Need to Provide (2026)
- CBAM in 2026: What Thai Exporters Must Do as the Definitive Phase Begins
- The 56-1 One Report ESG Section: What SET-Listed Companies Must Include (2026)