Accounting and tax obligations of owning a Thai business
A deeper look at the accounting and tax cycle a Thai company faces: bookkeeping, VAT, corporate income tax, the annual audit, and withholding tax.
The compliance cycle, revisited in depth
The running a business page sketches the tax and accounting cycle in outline; this page goes further, because underestimating this side of ownership is one of the more common ways new foreign owners get an unpleasant surprise in year one.
Bookkeeping day to day
A Thai limited company is legally required to keep proper accounting records prepared to Thai accounting standards, not an informal notebook or a spreadsheet kept however the owner prefers. That means genuine monthly reconciliation of income and expenses, retained supporting documents for transactions, and records that would actually survive an audit. Informal cash bookkeeping habits inherited from a previous owner are exactly the kind of thing worth flagging during due diligence — a business run this way isn’t automatically fraudulent, but it is a liability you’re about to inherit unless it’s fixed before or at handover.
VAT
Businesses meeting the applicable revenue threshold must register for and file Value Added Tax on a recurring monthly cycle, tracking input VAT (on purchases) against output VAT (on sales) and remitting the difference. Whether a specific business is over or under the threshold, and how VAT registration interacts with its pricing and supplier relationships, is worth confirming with an accountant as part of due diligence rather than assumed either way.
Corporate income tax and the annual audit
Thai limited companies generally need an annual financial statement prepared and audited by a licensed auditor, filed alongside the corporate income tax return. This is a real, recurring cost — budget for it as a genuine annual line item, not a one-off task you handle once and forget. A business with a messy or absent audit history is telling you something about how seriously it has been run.
Withholding tax
On certain categories of payment — rent, many professional and service fees among them — the paying business is generally required to withhold a portion of the payment and remit it to the tax authorities on the payee’s behalf, then issue the appropriate certificate. This is a commonly overlooked obligation for new foreign owners unfamiliar with the system, and one worth having your accountant walk you through concretely before you start signing supplier and landlord payments yourself.
Social security and payroll
Registered employees generally require both employer and employee social security contributions, processed on a recurring payroll cycle alongside any applicable payroll tax withholding — tightly linked to the staffing obligations covered on running a business.
Choosing an accountant
Look for a Thai-licensed accountant genuinely experienced with small, foreign-owned businesses in your specific sector, and engage them during due diligence — before you buy — rather than only after completion. An accountant who reviews the seller’s historic filings before you commit can catch problems a lease-and-licence review alone would miss, and the same relationship should carry straight through into your ongoing compliance from day one of ownership.