Capital gains & resale tax

When you sell Thai property, the tax treatment of the sale is a distinct question from the taxes and fees paid on a purchase, even though several of the same categories are involved. This page focuses specifically on the seller’s side of a resale — what is taxed, why the calculation differs for individuals and companies, and what documentation makes the process smoother.

Withholding tax is collected at the point of transfer

Unlike many countries where capital gains tax is settled later through an annual tax return, Thai withholding tax on a property sale is generally calculated and collected at the Land Office at the moment of transfer, based on figures the Land Office holds or the seller provides. This means the tax exposure on a sale is largely resolved on the spot, rather than left as an open liability to be assessed months later — which is convenient in one sense, but means it needs to be planned for and understood before the transfer date, not discovered at the counter.

Individual sellers versus company sellers

The calculation basis for withholding tax differs meaningfully depending on whether the seller is an individual or a company, reflecting the different way personal income tax and corporate income tax treat a gain. For an individual seller, the calculation generally has regard to factors including the appraised value of the property and how long it has been held. For a company seller, the calculation generally follows corporate income tax principles applied to the transaction. Because these calculations involve genuine complexity and change over time, this page deliberately does not quote a formula or rate — get the actual calculation for your specific sale from your lawyer or the Land Office.

Holding period and Specific Business Tax versus stamp duty

How long the seller has owned the property is one of the main factors determining whether Specific Business Tax or ordinary stamp duty applies to the sale — broadly, a shorter holding period tends to point toward Specific Business Tax, with certain exemptions where the property has genuinely been the seller’s principal residence for a qualifying period, while a longer holding period tends to point toward stamp duty instead. The two are not normally both charged on the same sale. Because the exact thresholds and exemption conditions are the kind of detail that changes and depends on individual circumstances, confirm the current position for your specific sale rather than assuming based on a general rule of thumb you have read elsewhere.

Selling through a company structure

If you hold property through a Thai company, there are effectively two ways to realise a sale: the company sells the property directly, triggering the property-transfer taxes above at the company level, or the shares in the company are sold instead, which can be taxed quite differently and involves its own set of considerations around company law and the buyer’s due diligence on the company itself. Which route makes sense depends heavily on the specific numbers and circumstances, and is worth modelling with a lawyer and an accountant before deciding, not after a buyer is already found. See property through a Thai company.

Reinvestment, exemptions and reliefs

Thai tax law does provide for certain exemptions and reliefs in specific circumstances — for example around a genuine principal residence held for a qualifying period. Whether any of these apply to your situation depends on facts specific to you (how the property was used, how long you held it, whether you meet the qualifying conditions), so treat any exemption as something to confirm applies to your case specifically, rather than something to assume.

Record-keeping that reduces friction at resale

• Keep your original purchase price documentation, transfer tax receipts, and (for a foreign freehold condo) the foreign-currency remittance evidence from your original purchase.
• Keep records of any capital improvements or major renovation costs — these can be relevant to how a gain is calculated in some circumstances.
• If you held through a company, keep the company’s accounts and filings current and accurate throughout the holding period, not scrambled together at the point of sale.

Get the calculation before you agree a price

Because the tax due on a sale directly affects your net proceeds, it is worth getting an actual calculation from your lawyer or an accountant before you agree a sale price or a tax-split arrangement with a buyer — not after the sale and purchase agreement is already signed. See purchase process & transfer for where this fits in the overall transaction sequence, and taxes & fees for the purchase-side categories.

Selling a leasehold, usufruct or superficies interest

Where what you are selling is not freehold title but a registered lease, or a house held via superficies, the tax treatment and the mechanics of the transfer differ from a straightforward freehold sale, and the value being transferred is itself harder to establish since it depends on the remaining term and the specific rights involved rather than a comparable freehold market price. If you hold one of these interests and are considering a sale, get a specific assessment from your lawyer of both the achievable value and the tax treatment before setting an asking price, rather than assuming it can simply be priced as a fraction of an equivalent freehold unit.