Protecting a foreign spouse's interest when property is bought during a Thai marriage

Can a foreign spouse have any legal claim on land bought during a Thai marriage? Not as a co-owner on the title — the Land Code's foreign-ownership ban applies regardless of marital status. What a foreign spouse *can* hold is a separate, registered right over that same land: most commonly a usufruct for life, paired with a superficies over the building, both set up at the Land Office at the time of purchase.

Why the land is titled to the Thai spouse alone

When a Thai national married to a foreigner buys land, a 1999 Ministry of Interior regulation requires both spouses to appear at the Land Office and sign a joint declaration, under penalty of perjury, that the purchase funds are the Thai spouse's sin suan tua (separate personal property) — not sin somros (marital property subject to 50/50 division) — and that the foreign spouse has no claim to the land. The rule exists because if the land counted as marital property, the foreign spouse would effectively hold an interest in Thai land through the back door, which the Land Code doesn't allow.

• The declaration is evidentiary, not absolute. Thailand's Supreme Court (Dika Decision No. 14736/2555) held that the Land Office declaration is only preliminary evidence — if the full facts show the purchase wasn't genuinely intended as the Thai spouse's sole property, a court can still treat the land as marital property. In practice this cuts both ways and shouldn't be relied on as either a shield or a claim.
• Don't sign a false declaration. A statement that funds are separate property when they visibly came from joint or foreign-spouse funds is a false declaration to a government official, and it undermines rather than helps any later claim.
• The declaration alone protects the marriage from foreign land ownership — it does nothing for the foreign spouse. The registered rights below are what actually do that.

The registered protection: usufruct plus superficies

The standard structure, put in place immediately after the Thai spouse's purchase, is two registrations on the back of the title deed:

• Usufruct (สิทธิเก็บกิน), Sections 1417–1428 of the Civil and Commercial Code — gives the foreign spouse the registered right to use the land and collect any income from it, typically for their lifetime. It survives divorce and survives the Thai spouse's death; it does not need to be renewed and cannot be unilaterally revoked by the landowner once registered. See Superficies, usufruct and lease for how the three rights differ.
• Superficies (สิทธิเหนือพื้นดิน), Sections 1410–1416 — separately titles any building on the land in the foreign spouse's name, so the house itself — not just the right to occupy — is an asset the foreign spouse owns, can mortgage, and can leave to heirs.
• Registration fee is nominal — usufruct and superficies granted without payment are assessed on a zero consideration value, so the Land Office charges only its fixed registration fee (roughly ฿100), plus whatever a lawyer charges to draft and file the paperwork.
• Both must be registered on the title deed to bind third parties. An unregistered agreement between spouses is only a personal contract and doesn't survive a sale of the land to someone else.

What a usufruct does and doesn't survive

• Divorce — a lifetime usufruct registered on the title is not automatically cancelled by divorce; it continues to give the foreign spouse the right to live on and use the land. This is the main reason it's the standard structure, not a lease, which is capped at 30 years and easier to dispute.
• Section 1469 risk is real but narrow. If the Thai landowner was already married when the usufruct was granted, Section 1469 of the Civil and Commercial Code lets a spouse contest a property transaction made without their consent. In practice, no reported Thai court decision has cancelled a registered usufruct on these grounds — but registering it with full transparency (and, where relevant, spousal consent on record) removes the exposure rather than testing it.
• The Thai spouse's death — the land passes to their heirs under a will or intestate succession, but the registered usufruct continues to bind whoever inherits, so the foreign spouse's right to use the land is unaffected. See Inheritance on Koh Phangan for how a lease or superficies inherits differently from land itself.
• The foreign spouse's death — a usufruct is personal and cannot be inherited; it simply ends, and full rights revert to the landowner. This is the trade-off against a lease-plus-superficies structure, where the building ownership can pass to the foreign spouse's own heirs.
• No registered rights at all — if the marriage ends and nothing was registered, the foreign spouse has no claim on the land itself, only a possible court claim for reimbursement of documented financial contributions (not a share of the land or its appreciation), and only if bank transfers, FET forms or receipts can prove the money was theirs.

Practical steps

• Register the usufruct and superficies at the same time as the purchase, not years later — waiting makes a Thai spouse harder to bring back to the Land Office once a marriage is under strain, and a right registered early is cleaner evidence of genuine intent if a court ever looks at it.
• Keep a paper trail for every baht transferred — bank statements, the FET form or equivalent inbound-transfer record (see Bringing money into Thailand), and dated receipts, even though the goal is a registered right rather than a reimbursement claim.
• Use a lawyer who represents the foreign spouse specifically, not one referred by or shared with the Thai spouse's family, when drafting the usufruct, any prenuptial agreement, and reviewing the declaration before it's signed.
• Weigh the alternative — a standard leasehold-plus-superficies purchase (see How foreigners legally own a villa) sidesteps the marital-property question entirely and is often simpler for a couple who isn't set on titling land to the Thai spouse specifically.

None of this is a substitute for advice on the specific marriage and asset picture — a usufruct suits a long, stable relationship where the land is meant to support the foreign spouse for life; it suits a shaky one far less well. What it reliably does is convert a purchase that would otherwise leave the foreign spouse with nothing but a possible reimbursement claim into a registered, court-recognised right to the land itself.