Year-End Financial Closing Timeline 2026: Key Deadlines for Thai Companies (December 31 Fiscal Year)
For companies registered in Thailand with a fiscal year ending December 31, 2025, all year-end filing obligations must be completed during 2026. This includes the Annual General Meeting (AGM), the submission of financial statements to the Department of Business Development (DBD), and the Corporate Income Tax return (PND 50) to the Revenue Department (RD). Missing any of these deadlines can result in financial penalties and legal consequences that are entirely avoidable with proper planning.
⚠️ Important Disclaimer: The information in this article reflects laws and regulations in force as of April 2026. Thai legislation is subject to change. Always verify the latest requirements directly with the Revenue Department (rd.go.th) and the Department of Business Development (dbd.go.th), or consult a qualified accounting professional before taking action.
📅 Complete Deadline Overview
📌 1. Annual General Meeting — Financial Statement Approval
📅 Deadline: By April 30, 2026
🏢 Authority: Company
📌 2. Shareholder List Submission (Bor.Or.Jor. 5)
📅 Deadline: By May 14, 2026
🏢 Authority: DBD
📌 3. Corporate Income Tax Return PND 50 (paper)
📅 Deadline: By May 30, 2026
🏢 Authority: Revenue Department
📌 4. Corporate Income Tax Return PND 50 (online)
📅 Deadline: By June 9, 2026
🏢 Authority: Revenue Department
📌 5. Financial Statements via DBD e-Filing
📅 Deadline: By May 31, 2026
🏢 Authority: DBD
1️⃣ Annual General Meeting (AGM) & Financial Statement Approval
Deadline: April 30, 2026
Thai limited companies with a December 31 fiscal year-end are legally required to hold their Annual General Meeting (AGM) within 4 months of the fiscal year close. This places the final deadline at April 30, 2026.
Key agenda items for the AGM include:
- Approval of the annual financial statements for fiscal year 2025
- Appointment of a Certified Public Accountant (CPA) for the upcoming year
- Preparation of accurate minutes of the meeting, to be retained for compliance purposes
2️⃣ Shareholder List Submission (Bor.Or.Jor. 5)
Deadline: May 14, 2026
Within 14 days of the AGM, the company must submit a copy of its shareholder register (Bor.Or.Jor. 5) to the Department of Business Development (DBD). This document lists all shareholders and their respective shareholding percentages as of the meeting date.
3️⃣ Financial Statement Submission to DBD via e-Filing
Deadline: May 31, 2026
The audited and AGM-approved financial statements must be submitted to the DBD through the DBD e-Filing system within 1 month of the date of shareholder approval. The submission package must include:
- Balance Sheet (Statement of Financial Position)
- Profit & Loss Statement (Income Statement)
- Cash Flow Statement
- Notes to the Financial Statements
- Auditor’s Report signed by a licensed CPA
4️⃣ Corporate Income Tax Return (PND 50) — Revenue Department
Deadline: May 30, 2026 (paper) / June 9, 2026 (online)
Under the Thai Revenue Code, companies must file their Corporate Income Tax return (PND 50) within 150 days of the fiscal year-end, which falls on May 30, 2026 for paper submissions.
Companies filing electronically through the Revenue Department’s online portal benefit from an 8-day extension, bringing their deadline to June 9, 2026.
✅ Best Practice: Filing online is strongly recommended. It provides a clear electronic record of submission, reduces the risk of errors, and gives you additional time to prepare the return accurately.
⚠️ Penalties for Late Filing
Failing to meet the above deadlines carries real financial and legal consequences. The following penalties apply under currently applicable Thai law:
Revenue Department Penalties (Late PND 50 Filing)
- 🚨 Surcharge (เงินเพิ่ม): 1.5% per month (or fraction thereof) on the outstanding tax amount
- 🚨 Fine for late or non-filing: THB 100 – 200 depending on circumstances
- 🚨 Penalty for tax evasion (serious cases): Up to 2 times the unpaid tax amount
DBD Penalties (Late Financial Statement Submission)
- 🚨 Company fine for late submission: Up to THB 50,000
- 🚨 Director(s) personally liable: Up to THB 50,000 per responsible director
⚠️ Important: The penalties listed above are based on regulations currently in force and may be subject to revision under new legislation. Always confirm the current applicable rates with the Revenue Department (rd.go.th) and the DBD (dbd.go.th) or a qualified tax advisor before relying on this information.
✅ Checklist: What to Prepare in Advance
To ensure a smooth and on-time year-end closing process, your company should have the following ready well ahead of each deadline:
- Completed and audited financial statements signed off by a licensed CPA
- Auditor’s Report in the required format
- AGM minutes accurately prepared and signed
- Bor.Or.Jor. 5 form with current shareholder details
- PND 50 return fully completed with tax payment arranged
Frequently Asked Questions (FAQ)
Q: What happens if our AGM is held after April 30, 2026? A: The company and its directors may face penalties under the Civil and Commercial Code. Additionally, all subsequent filing deadlines — shareholder list, DBD submission, and PND 50 — will be affected. Seek legal advice immediately if you anticipate missing this date.
Q: What documents are required for DBD e-Filing? A: You will need the CPA-certified financial statements, the auditor’s report, the annual report, and a copy of the AGM minutes, all in the file formats accepted by the DBD e-Filing system.
Q: Does a company with zero revenue still need to file PND 50? A: Yes. All registered Thai companies are legally required to file a PND 50 return within the deadline, regardless of whether they generated income or recorded a loss during the fiscal year.
Q: What is the difference between the paper and online PND 50 deadlines? A: Paper submissions are due by May 30, 2026 (150 days from fiscal year-end). Online submissions via the Revenue Department portal receive an 8-day extension, making the deadline June 9, 2026. The DBD financial statement deadline of May 31, 2026 is not subject to the same online extension.
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