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How We Help
We advise foreign spouses on how Thai law classifies their property from the day of marriage, how to keep personal assets separate, and how sin somros is divided — before marriage, during it, and in contested divorce proceedings.

Overview
This is one of the most misunderstood areas of Thai family law, and it costs expats significant money when they discover the rules mid-divorce rather than before the wedding. We advise clients on marital asset classification regularly, and the same misunderstandings come up every time: the assumption that the registered owner of a property is the sole legal owner, that separately earned income belongs to the earner, or that a name on a bank account determines ownership. Under Thai law, none of those assumptions are correct within a marriage.
Thai law divides property into two categories from the moment of marriage registration. Personal property, sin suan tua, belongs to one spouse. Marital property, sin somros, belongs equally to both. Understanding which category your assets fall into, and actively managing them to maintain that classification, is something we help clients with both before and during marriage.
Pook, Lead Barrister
Most disputes I see in divorce cases are not about whether people want to end the marriage. They are about property. Specifically, they are about one party believing they personally own something that Thai law classifies as jointly owned, and the other party knowing exactly what the law says. We see this pattern constantly. Understanding the rules before you marry, not when you are divorcing, is the only sensible approach, and it is what we recommend to every client who comes to us for family law advice before their wedding.
Section 1
Sin suan tua is property that belongs to one spouse alone and is not subject to division on divorce. The key categories are property owned before the marriage registration, gifts and inheritance received by one spouse during the marriage, and personal effects. The challenge we help clients with is documentation. We regularly see disputes where a client can show a property was bought before marriage but cannot demonstrate that the funds used were separate from later marital income, and that ambiguity can cost them half the asset's value.
We advise clients who are already married and want to protect the personal property status of their pre-marital assets to keep those assets completely separate from joint accounts and marital income. Once commingled, the personal property argument becomes very difficult to sustain in court. Where clients come to us early enough, we help them put the right documentation and account structures in place.
Section 2
Sin somros is the default classification for everything acquired during the marriage. It does not matter which spouse earned the money, whose name is on the title deed, or who initiated the purchase. If it was acquired after the marriage registration date, both spouses own it equally. This is the rule that surprises expat clients most consistently.
A condominium purchased in one spouse's name during the marriage, paid for entirely from that spouse's salary, is sin somros. Both spouses own it equally under Thai law. We explain this to clients who are surprised to discover it, and we represent clients in divorce proceedings where the other party is relying on exactly this rule to claim half of what our client believed was theirs alone.
Section 3
Where divorce is by mutual consent, the parties can agree their own division of sin somros and document it in the divorce agreement registered at the District Office. We draft these agreements for clients and ensure the terms are clear, registered correctly and legally binding. An informal understanding between separating spouses that is not properly documented and registered has no legal standing.
Where divorce is contested and goes through the Thai Family Court, the default is equal division of sin somros. Courts do have the ability to depart from equal division where there is compelling evidence, one spouse wasted marital assets, contributed overwhelmingly more to the marriage, or acted in a way that seriously harmed the other. Building that case requires careful preparation and the right documentation. We represent clients in contested property disputes through the full court process.
Our Approach
We work with clients at every stage, before marriage to establish the right structures, during marriage when asset classification questions arise, and through divorce when property division becomes disputed. Our starting point is always to understand exactly what assets are involved, how they were acquired and what documentation exists. That determines the strategy, whether we are negotiating an agreed division or preparing for a contested court hearing.
Section 4
Thai law divides property into personal property (sin suan tua) and marital property (sin somros) from the day of marriage registration.
All property acquired during marriage is sin somros and owned equally by both spouses, regardless of who paid or whose name is on the title.
Pre-marital assets, gifts and inheritance are personal property but must be clearly documented and kept separate to remain so.
On uncontested divorce, parties can agree their own division. On contested divorce, courts divide sin somros equally by default.
Neither spouse can sell or dispose of sin somros without the other's written consent.
A prenuptial agreement signed before marriage registration is the most effective way to define what remains personal property.
We advise on asset classification, prenuptial agreements, consent requirements and division in both uncontested and contested divorce cases.
Speak with Our Team
We advise on asset classification, prenuptial agreements and property division at every stage of a marriage.
Continue Reading
Drafting, registration and enforceability of Thai prenups.
Recognising a foreign divorce and divorcing across borders.
Calculation, enforcement and cross-border support issues.
Matrimonial property, prenups, immigration routes and what marriage does not give you.
Every family law guide for foreign nationals in Thailand.
Lawyers for Expats Thailand — Family Law Practice. August 2026. This page does not constitute legal advice. Always obtain qualified independent legal advice for your specific circumstances.