Prenuptial Agreement in Thailand: A Guide for Foreign Couples

What Is a Prenuptial Agreement in Thailand?

Under Thai law, a prenuptial agreement is also called a “marriage settlement” or sanya korn somros. Two people enter into this written contract before they register their marriage. It lets the couple set their own rules for owning and managing property. Otherwise, the default provisions of the Civil and Commercial Code (CCC) apply.

Section 1465 of the CCC is the starting point. It confirms that where spouses have not concluded a valid agreement, the Code itself governs their property relations. Crucially, the same section voids any clause that runs contrary to public order or good morals. It also voids any clause stating that foreign law will govern the couple’s property. In short, a Thai marriage triggers Thai matrimonial property rules. Only a valid prenuptial agreement can change that result.

The Legal Framework: Sections 1465 to 1469

Four provisions of the Civil and Commercial Code shape every Thai prenuptial agreement. Foreign couples should understand each one before they sign.

Section 1465 – Freedom to Contract, With Limits

Spouses may agree on their property arrangements, but any provision that is contrary to public order or good morals is void. A clause electing foreign law to govern the couple’s property is also void.

Section 1466 – The Validity Test

This is the provision that catches the most couples off guard. A prenuptial agreement is void unless the couple meets three conditions. They must make it in writing. They must also sign it before at least two witnesses. Finally, they must annex it to the marriage register when they register the marriage. Miss any element, and the contract fails.

Section 1467 – No Changes After the Wedding

Once the marriage is registered, the couple cannot amend or cancel the prenuptial agreement except with the authorisation of a Thai court. The court then notifies the registrar, who records the change.

Section 1469 – Agreements Made During Marriage

Any property agreement that spouses make during the marriage is fragile. Either party may avoid it at any time while married, or within one year after the marriage ends. This is why genuine asset protection must be settled before the wedding, not after.

Sin Suan Tua vs. Sin Somros: How Marital Property Works

To draft an effective agreement, couples first need to understand how Thai law classifies property. The Civil and Commercial Code divides everything a married couple owns into two categories.

Sin Suan Tua (personal property) belongs to one spouse alone. This category includes property owned before the marriage and personal effects. It also covers property acquired during marriage by gift or inheritance, plus the khongman (engagement gift). Each spouse keeps their own sin suan tua if the marriage ends.

Sin Somros (marital property) is the shared category. It covers property the couple acquires during the marriage. The category also includes income and fruits from personal property, plus any asset the couple documents as marital. On divorce, the default rule divides sin somros equally.

A prenuptial agreement allows couples to redraw these lines. For example, a foreign spouse can ring-fence a business built before the marriage. Future income from offshore investments can also stay personal rather than becoming divisible.

Registration Requirements: Why Timing Is Everything

The most common reason a Thai prenuptial agreement fails is timing. Under Section 1466, the couple must register the agreement together with the marriage itself. This happens at the district office (amphur) run by the Department of Provincial Administration. A couple cannot sign a prenuptial agreement weeks later and expect it to bind them. If the couple skips this step on the registration day, the agreement is void.

To be safe, international couples should complete several steps well in advance:

• Prepare the agreement in Thai, ideally alongside a certified English translation so both spouses fully understand the terms.
• Ensure both parties and at least two witnesses sign the document.
• Notify the district office in advance that a prenuptial agreement will be registered with the marriage.
• Register the agreement and the marriage on the same day, in the same place.

Because the formalities are absolute, couples benefit from drafting the contract early and reviewing it with a Thai-qualified lawyer rather than relying on a template downloaded online.

What a Thai Prenuptial Agreement Can and Cannot Cover

A well-drafted agreement is powerful, yet statute limits its scope. Understanding the boundaries prevents costly disputes later.

It can classify assets as personal or marital property, allocate responsibility for pre-existing and future debts, protect a family business or inherited wealth, and clarify how property will be divided if the marriage ends.

It cannot determine child custody or child support, because Thai courts decide those issues based on the welfare of the child. It also cannot include terms that offend public order or good morals, nor can it validly select foreign law to govern the couple’s property under Section 1465. A court strikes out any such clause, while the rest of the agreement may survive.

Special Considerations for Foreign Couples

For international clients, a prenuptial agreement in Thailand rarely stands alone. It usually forms part of a broader cross-border wealth strategy.

First, a prenuptial agreement signed abroad will not automatically satisfy the Thai formalities. Couples who already hold a foreign prenup should still register a compliant agreement in Thailand at marriage. That step secures local enforceability. Second, the agreement should match how foreign spouses hold assets locally, including structures used for foreign property ownership in Thailand. Third, couples should coordinate the agreement with estate planning. Property classification affects what passes under a Thai will. Settling these questions early reduces conflict and protects both partners.

Couples should also remember that a prenuptial agreement does not prevent divorce in Thailand; rather, it makes the financial consequences predictable. Combined with sound estate planning through a Thai will, it gives foreign families clarity and control.

Frequently Asked Questions