Closing the Fiscal Year in Thailand: What Companies Need to Prepare

For most companies registered in Thailand, the fiscal year ends on 31 December. The weeks before and after that date set the pace for a series of legal obligations that run into the first half of the following year: closing the books, the statutory audit, the shareholders’ meeting, and the filings with the Department of Business Development (DBD) and the Revenue Department.

None of these steps is complicated on its own. The difficulty is that they depend on each other, and a delay at the start of the process tends to compress everything that follows. For foreign-owned companies managing their Thai entity from abroad, understanding the sequence early makes the year-end considerably easier.

The Fiscal Year and the Accounting Period

By default, the accounting period of a Thai company is twelve months ending 31 December. A company can choose a different year-end, but changing it later requires written approval from the Revenue Department. Newly incorporated companies may have a shorter first accounting period, ending on the first fiscal year-end after registration.

All deadlines described below are calculated from the fiscal year-end. A company closing on 31 March or 30 September follows the same rules, simply shifted to its own calendar.

Closing the Books

The first step is internal: making sure the accounts for the year are complete and accurate. In practice this means reconciling bank accounts, reviewing receivables and payables, confirming inventory where relevant, recording accruals and depreciation, and checking that VAT and withholding tax filings made during the year are consistent with the accounts.

This last point matters more than it used to. The Revenue Department increasingly cross-checks data between VAT returns, withholding tax records, corporate income tax filings, and customs declarations. Inconsistencies between these filings are one of the most common triggers for questions from the tax authorities, even when there is no underlying compliance issue.

Companies that keep their monthly bookkeeping current throughout the year generally find the closing much faster, because fewer corrections are needed once the year is over.

The Statutory Audit

Every Thai limited company must have its annual financial statements audited and certified by a licensed Thai auditor, regardless of size or activity level. This applies even to companies with little or no revenue in the year.

The audited financial statements include the statement of financial position, the profit and loss statement, the statement of changes in equity, the cash flow statement where required, and the notes. They must be prepared in Thai, or in a foreign language accompanied by a Thai translation.

Auditors are in high demand between January and April, as most companies share the same year-end. Booking the auditor in advance and having the accounts ready early in the year avoids a rushed process close to the deadlines.

The Key Deadlines

For a company with a 31 December 2026 year-end, the main deadlines in 2027 are:

• Annual General Meeting (AGM): within four months of the year-end, so by 30 April 2027. The shareholders approve the audited financial statements at this meeting.

• Shareholder list (Bor.Or.Jor.5): filed with the DBD within 14 days of the AGM.

• Financial statements to the DBD: submitted through e-filing within one month of the AGM.

• Corporate income tax return (PND 50): filed with the Revenue Department within 150 days of the year-end, around 30 May 2027.

The AGM and DBD filing on one side, and the PND 50 on the other, run on separate tracks. Both depend on the audited financial statements being ready, which is why the audit is usually the critical step. The Revenue Department often grants a short extension for online filing, but this is announced each year and should be confirmed rather than assumed.

Failing to hold the AGM on time or filing late with the DBD can result in fines for both the company and its directors, and late tax filing carries penalties and surcharges under the Revenue Code.

The year-end closing also connects to the half-year corporate income tax return filed during the year. Our article on PND 51 covers how that estimate works and why it matters for the final annual return.

Foreign Parent Companies and Group Reporting

Most private Thai companies prepare their statements under the Thai Financial Reporting Standards for Non-Publicly Accountable Entities (TFRS for NPAEs). Where a foreign parent consolidates its accounts under IFRS or another framework, the Thai figures may need adjustments before they can be included in group reporting. Aligning the local and group timelines early helps avoid duplicated work or conflicting numbers between the two.

Preparing Ahead

A smooth year-end usually comes down to a few simple habits: keeping the monthly bookkeeping up to date, reconciling tax filings before the year closes, booking the auditor early, and having a clear calendar with one person responsible for each deadline.

KLAY works with foreign companies operating in Thailand to coordinate these obligations alongside our licensed accounting and audit partners, so that the international team has one point of contact and a clear view of what is due and when. If you would like to review your year-end timeline or your current setup, contact us.