ฉบับภาษาไทย: อ่านหน้านี้เป็นภาษาไทย
When is the Thai corporate income tax return due?
Short answer
Thai companies file a mid-year return and an annual return with the Revenue Department, with deadlines counted from the end of the accounting period. Confirm the exact dates for your accounting period, since a non-calendar year shifts every deadline.
Audited financial statements must also be approved by shareholders and filed with the Department of Business Development, and the two deadlines are separate obligations that people frequently conflate.
Electronic filing can carry a different deadline from paper filing. We confirm the route being used before diarising the date.
Reviewed as of 2026-08-04. General guidance only, not case-specific advice and not a guarantee of outcome. Government fees, conditions and processing times are set by the responsible authority and can change. This site does not publish prices — please ask our staff.
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