June 20, 2026True Bizz Team
TaxAccounting
Running a company in Thailand means a steady rhythm of filings. Miss a deadline and you face penalties and surcharges. Here is the 2026 compliance calendar every foreign-owned company should know.
Monthly deadlines
| Filing | Due |
|---|---|
| Withholding tax (PND3/53) | By the 7th of the following month |
| VAT return (PP30) | By the 15th of the following month |
| Social security | By the 15th of the following month |
| Payroll PIT (PND1) | By the 7th of the following month |
Annual & half-year deadlines
| Filing | Due |
|---|---|
| Half-year corporate tax (PND51) | Within 2 months of the half-year end |
| Audited financial statements + annual corporate tax (PND50) | Within 150 days of the financial year-end |
| Personal income tax (PND90/91) | By 31 March |
Don't miss a deadline
Late or incorrect filings trigger penalties and surcharges, and can put BOI incentives or work permits at risk. True Bizz tracks every deadline and files on time as part of accounting and corporate income tax services. Talk to us to put your compliance on autopilot.