Property through a Thai spouse: what the law actually says

What the Land Office requires

When a Thai national married to a foreigner buys land, the Land Office requires both spouses to declare in writing that the purchase funds are the Thai spouse's separate property, known as sin suan tua, and not marital property. The foreign spouse signs a confirmation to the same effect. Without this declaration the office will refuse the registration, because land held as marital property would give the foreign spouse a part-ownership the Land Code prohibits.

The declaration is not a formality to be signed and forgotten. It is a formal statement, made to a government office, that the money was the Thai spouse's own and that the foreigner claims no ownership interest in the land. In most real cases the funds originate with the foreign spouse, which means the legal effect of the transaction is a completed gift.

It is worth pausing on why the rule exists. Thai law treats property acquired during marriage as jointly owned by default, and without the declaration every land purchase by a Thai spouse would hand the foreign partner a half interest in Thai land automatically. The declaration is the state closing that door, and it closes it firmly in both directions: the Land Office gets its certainty, and the foreign spouse gets a signed record of having claimed nothing.

What that means on divorce and death

Because the land is declared separate property, it does not enter the marital pot on divorce. The foreign spouse has no ownership claim to the land itself, and arguing later that the declaration was untrue means asserting that a false statement was made to the Land Office, a position no court receives warmly and one that carries its own risks. Some disputes have produced partial recoveries on other grounds, but no one should plan around litigation outcomes.

On death the position is different and somewhat kinder. A foreign spouse can inherit land as a statutory heir, but cannot simply keep it: the law requires disposal within a limited period, typically around a year, unless a rarely granted permission applies. In practice the land is sold or transferred to Thai heirs, with the foreign spouse taking value rather than title. A properly drafted Thai will on both sides makes this manageable; intestacy makes it painful.

Mitigations that actually exist

The gift cannot be structured away, but the foreign spouse's position can be materially improved with registered rights that survive both disputes and a sale of the land. These are entered on the title deed at the Land Office, and our separate briefing on usufructs and superficies covers their mechanics in detail.

• A registered lease from the Thai spouse to the foreign spouse, up to 30 years, giving a durable right of occupation.
• A registered usufruct for life, giving lifetime use and enjoyment that binds any future owner of the land.
• A registered superficies over the house, so the foreign spouse owns the building even though the land is the Thai spouse's.
• A registered mortgage in the foreign spouse's favour where funds are documented as a loan rather than a gift, creating a secured claim on the land's value.
• Thai wills for both spouses, prepared together with the purchase rather than years later.

Of these, the lease and the usufruct do the everyday work, securing the roof over the foreign spouse's head whatever happens to the marriage or the land's ownership, while the mortgage route is worth serious consideration where the sums are large: a documented loan with registered security converts an unprotected gift into a creditor position with a claim on the land's value. It requires honesty at the outset about what the money is, and consistent paperwork thereafter.

Each of these must be registered to matter, and some Land Offices look sceptically at rights granted between spouses on the day of purchase. Sequencing and local practice are points for counsel, not improvisation.

Honest counsel

No structure converts the declaration back into ownership. Nominee arrangements that pretend otherwise are illegal and create worse problems than the one they claim to solve. The honest framing is this: money put into land through a Thai spouse is, in law, that spouse's property, and the foreign spouse holds only whatever registered rights were put in place at the time. For some families that is entirely acceptable; for others, a foreign-quota condominium in the foreign spouse's own name, or a leasehold villa structure, fits the risk tolerance better. Asia Global Partners walks couples through these trade-offs candidly before purchase, and arranges the registrations that give the foreign spouse every protection the law actually offers.

This briefing is general information, not legal, tax or investment advice. Thai rules change frequently and individual cases differ. Verify current requirements with the relevant authorities, including the Immigration Bureau, the Board of Investment, the Land Department, the Department of Business Development and the Revenue Department, and take advice on your own facts before acting.