Year-End Tax Planning 2026 (B.E. 2569): Deduction Checklist Before 31 December

Thai personal income tax follows the calendar year, so anything you want to deduct for tax year 2026 (B.E. 2569) must be paid or completed by 31 December 2026. This article (in Thai) explains the key terms, shows a worked example of how much tax a deduction can save, covers what is new this year (solar rooftop deduction of up to THB 200,000 and donations that must go through the Revenue Department's e-Donation system), and gives a checklist and a step-by-step plan for the last three months of the year. For help planning your taxes, contact Arnajak Accounting Co., Ltd., a DBD-certified Quality Accounting Office: tel. 045-312633, email account@arnajak-group.com, LINE @arnajak-account.