Annual Filing Obligations for Companies in Thailand

What Foreign-Owned Businesses Operating in Thailand Need to Complete Each Year

For foreign-owned companies registered in Thailand with a 31 December financial year-end, the annual corporate income tax return is due in early June. The filing itself is straightforward. What catches many business owners off guard is the chain of steps that must be completed before the return can be submitted at all.

The PND 50 corporate income tax return is the final step in a longer compliance sequence, not the starting point. Each stage in the process depends on the one before it, which means a delay at any point pushes the entire timeline forward.

The Annual Compliance Sequence

For a company with a financial year ending 31 December 2025, the key stages and indicative deadlines run as follows.

Step	Indicative Timing	Action Required
1	Jan – Feb	Close FY2025 accounts: finalise all transactions, reconcile balances, and prepare draft financial statements.
2	Feb – Mar	Complete the independent audit by a licensed Thai auditor (CPA). The auditor reviews the financial statements and issues an opinion.
3	By 30 Apr	Hold the Annual General Meeting (AGM). Shareholders formally approve the audited financial statements. Required within four months of year-end under the Civil and Commercial Code.
4	Within 1 month after AGM	File audited financial statements and shareholder list (Bor. Or. Chor. 5) with the Department of Business Development (DBD).
5	By 2 Jun / 8 Jun	Submit the PND 50 corporate income tax return and pay any tax due to the Revenue Department. The standard deadline is 2 June 2026; e-filing extends this to 8 June 2026.

The timeline above illustrates why the process cannot realistically begin in May. A company that has not yet closed its accounts faces a compressed sequence where audit scheduling, AGM logistics, and filing preparation must all happen in parallel rather than in order.

Filing Deadlines at a Glance

The following deadlines apply to companies with a 31 December 2025 financial year-end.

Filing Obligation	Deadline
AGM to approve financial statements	30 April 2026
Shareholder list (Bor. Or. Chor. 5) to DBD	Within 14 days of AGM
Audited financial statements to DBD	Within 1 month of AGM
PND 50 to Revenue Department (paper)	2 June 2026
PND 50 to Revenue Department (e-filing)	8 June 2026

Dormant Companies Are Not Exempt

A common misconception among foreign business owners is that a company with no revenue or activity during the year does not need to complete annual filings. Under Thai law, every registered company must prepare financial statements, have them audited, hold an AGM, file the PND 50, and submit financial statements to the DBD. The obligation exists regardless of whether the company traded during the year.

This applies equally to companies established for projects that have not yet commenced, holding entities with no operational activity, and businesses that have ceased trading but remain registered. Dormant companies that fail to meet these obligations face the same penalty exposure as active ones.

Consequences of Non-Compliance

Late or non-filing carries consequences on both the Revenue Department and DBD sides. On the tax side, the Revenue Code (Section 89) imposes a 1.5% monthly surcharge on any unpaid corporate income tax, calculated from the filing deadline until the tax is settled, though the total surcharge is capped at the amount of tax payable. A separate criminal fine of THB 1,000 to 2,000 per month of delay applies for late submission of the return itself. On the DBD side, the Accounting Act provides for fines on both the company and its managing director for late submission of financial statements, with amounts increasing based on the length of the delay: THB 1,000 each for delays up to 2 months, THB 4,000 each for 2 to 4 months, and THB 6,000 each for delays exceeding 4 months, subject to a statutory ceiling of up to THB 50,000 per party.

In both cases, the penalties apply to the company and to its directors personally. This is a point that foreign shareholders acting as directors sometimes overlook. Director liability under Thai corporate and tax law is not theoretical. The DBD and Revenue Department enforce these provisions routinely.

Beyond the direct financial penalties, companies with outstanding annual filings may encounter difficulties with banking relationships, work permit renewals for foreign employees, BOI compliance reviews, and corporate transactions such as share transfers or capital increases.

Reducing Year-End Pressure

The most effective way to avoid deadline pressure is to maintain current accounting records throughout the year. When monthly or quarterly closes are performed consistently, the year-end closing process becomes a reconciliation exercise rather than a reconstruction effort. For foreign-owned businesses, this is also the single most common bottleneck: incomplete records during the year translate directly into a compressed and stressful filing season.

Auditor availability is the second constraint. Licensed auditors in Thailand handle multiple clients during the same filing period. Companies that confirm their audit engagement early and provide clean working papers to the auditor move through the process faster than those that treat the audit as a last-minute task.

BizWings Thailand assists foreign-owned companies with annual account closing, audit coordination, AGM preparation, and tax filings across the full compliance cycle. For more information on compliance obligations and tax filing obligations, check out our free tool and get a personalised compliance calendar based on your financial year start and your business activities.

Tax & Compliance Calendar Tool