Monthly bookkeeping for Thai companies
In short
Thai companies keep accounts under the Accounting Act B.E. 2543 (2000) and file monthly tax returns with the Revenue Department. Bookkeeping is not just a compliance chore: it produces the withholding tax certificates, VAT reports and payroll records that later filings depend on.
The monthly cycle drives everything else. Purchase and sales tax invoices are captured, withholding tax is calculated on the payments that require it, payroll is run, and the resulting returns are filed within the deadlines set by the Revenue Department and the Social Security Office.
Document discipline is what keeps the year-end audit cheap. Original tax invoices, receipts in the company's name and evidence that an expense relates to the business are the three things auditors and the Revenue Department both ask for.
What we need from you
- Bank statements for every company account
- Sales and purchase tax invoices for the period
- Payroll data and social security registrations
- Details of any related-party transactions
Watch out
Expenses paid personally by a director without documentation in the company's name are routinely disallowed.
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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