Cohabitation & Unmarried Partners.

Many couples in Thailand live together without legally registering a marriage. Some have been together for decades. They may share a home, raise children, operate businesses together and regard themselves as husband and wife, spouses or life partners.

But a long relationship does not necessarily give an unmarried partner the same legal rights as a spouse under Thai law. This distinction becomes particularly important when:

• the relationship ends;
• one partner dies;
• property has been purchased;
• a house has been built;
• substantial money has been transferred;
• children are involved;
• one partner is financially dependent upon the other; or
• the couple assumed that living together eventually created the legal equivalent of marriage.

For foreign nationals, the position can be even more complicated where Thai land, immigration status and assets in several countries are involved.

Common-Law Marriage

Does Thailand Recognise Common-Law Marriage?

Couples should not assume that living together for a particular number of years automatically creates a legal marriage. A relationship does not become a registered Thai marriage simply because a couple:

• live at the same address;
• have been together for many years;
• introduce themselves as husband and wife;
• hold a wedding ceremony;
• exchange rings;
• pay or receive Sin Sod;
• have children together;
• share expenses; or
• own assets together.

A traditional, Buddhist or family wedding ceremony can have enormous personal and cultural significance. It does not replace legal marriage registration.

For the legal status of marriage under Thai law, formal registration through the Thai civil-registration system is fundamental. For information on the marriage-registration process, see the Marriage to a Thai National guide.

"We've Been Together for 20 Years"

Length of the relationship can be important evidence when establishing facts about property, children or financial arrangements. But it should not be treated as a substitute for marriage registration.

Marriage and Cohabitation Are Legally Different

A registered marriage creates a statutory legal relationship between spouses. That legal status can affect matters including:

• matrimonial property;
• inheritance;
• maintenance;
• management of marital assets;
• divorce;
• succession;
• family relationships; and
• other rights specifically given to spouses.

An unmarried couple does not automatically enter that matrimonial regime simply by living together. In particular, unmarried partners should not automatically assume that Thailand's rules concerning Sin Suan Tua and Sin Somros apply to them in the same way as they apply to legally married spouses. Instead, ownership and financial disputes may need to be determined using ordinary property, contract and other applicable legal principles.

Same-Sex Couples

Same-Sex Unmarried Couples

Since 23 January 2025, qualifying same-sex couples can legally marry in Thailand. Couples who choose not to marry remain unmarried.

Marriage equality did not automatically convert existing same-sex relationships into marriages. A same-sex couple who have lived together for many years should not assume that the Marriage Equality Act automatically changed their relationship status on 23 January 2025. If they want the legal status of marriage, the marriage must be validly registered.

The same general distinction between marriage and cohabitation now applies regardless of whether the couple is same-sex or opposite-sex. For full guidance on same-sex marriage registration and rights, see the Same-Sex Marriage & LGBTQ+ Rights guide.

Property

Property When You Are Not Married

Property ownership is one of the most common sources of disputes between unmarried couples. If a couple is not legally married, do not assume that an asset acquired during the relationship automatically becomes 50/50 property.

Important questions include:

• Who legally owns the asset?
• Whose name appears on the title or registration?
• Who paid the purchase price?
• Was the money a gift or a loan?
• Was there an agreement about ownership?
• What evidence exists?
• Was the property purchased jointly?
• Did one person contribute money while the other contributed something else?
• Are there written contracts?
• What did the parties intend when the transaction occurred?

These questions can become crucial after separation.

Keep Evidence of Major Contributions

If you contribute substantial money towards an asset, preserve evidence. Useful records may include:

• bank transfers;
• receipts;
• purchase agreements;
• loan agreements;
• messages and emails discussing the purchase;
• contracts;
• invoices;
• property documents;
• company records;
• photographs of construction;
• evidence of building payments; and
• written acknowledgements of money received.

Was the Money a Gift, Loan or Investment?

Large transfers between unmarried partners frequently become disputed. One person may say: "I lent you ฿2 million to build the house." The other may say: "You gave me the money because we were together." That distinction can have major legal consequences.

Before transferring significant funds, establish whether the money is:

• a gift;
• a loan;
• an investment;
• payment for an ownership interest;
• payment towards a jointly owned asset;
• family support; or
• money being held temporarily.

If it is genuinely a loan, consider documenting it as a loan. If it is an investment, identify what legal interest is being received.

Foreigners and Thai Land

Foreigners and Thai Land

Foreign nationals face an additional major issue. Thailand restricts foreign ownership of land.

• Living with a Thai partner does not remove those restrictions.
• Being engaged does not remove them.
• Having children with a Thai national does not remove them.
• Paying for the land does not necessarily make the foreign partner its legal owner.

A foreign national should therefore be extremely cautious about transferring substantial money to purchase land that will be registered solely in the Thai partner's name. For a full explanation of how foreign nationals can legally hold interests in Thai property, see the Foreign Land Ownership guide.

"The Land Is in Her Name, But It's Really Mine"

Building a House on Your Partner's Land

This is one of the most important issues for unmarried foreign-Thai couples. A foreign partner may spend substantial sums — ฿1 million, ฿3 million, ฿5 million or considerably more — building a house on land owned by the Thai partner or the Thai partner's family.

The relationship may be excellent when construction begins. If the relationship later ends, the foreign partner may discover that paying for the building did not automatically give them ownership of the underlying land or a permanent right to remain there.

Before construction begins, establish answers to each of the following:

• Who owns the land?
• Who will own the building?
• What right does the foreign partner have to occupy the land?
• How long does that right last?
• Whether the right can be registered.
• What happens if the landowner dies?
• What happens if the relationship ends?
• What happens if the land is sold?
• What happens to the money invested in construction?

These questions should be answered before substantial money is committed.

Legal Structures That May Need Consideration

Depending upon the circumstances, Thai property law contains mechanisms that may be relevant to protecting a person's right to use land or property. These can include arrangements involving:

• lease;
• usufruct;
• superficies;
• mortgage;
• properly documented loans; and
• contractual rights.

For detailed guidance on individual arrangements, see the Leasehold Property guide, Usufruct guide and Superficies guide.

Other Assets

Buying a Condominium Together

Condominiums are different from land. Foreign nationals may be able to own qualifying condominium units in Thailand subject to the requirements of the Condominium Act, including the foreign ownership quota and applicable rules concerning purchase funds.

Where an unmarried couple purchases a condominium, establish clearly:

• who will be registered as owner;
• whether ownership is joint where legally permitted;
• how much each person contributes;
• how sale proceeds will be divided;
• who pays ongoing expenses;
• what happens on separation; and
• what happens if one owner dies.

Do not assume cohabitation itself creates ownership. For full guidance on condominium ownership rules for foreign nationals, see the Condominium Act guide.

Cars, Motorcycles and Other Assets

The same practical problem can arise with vehicles and other valuable assets. If one partner pays for a vehicle but registration is placed solely in the other partner's name, there may later be disagreement about ownership. Keep purchase documents, finance agreements, registration records, bank transfers and any evidence of an agreement between the parties. For expensive assets, record ownership clearly at the time of purchase.

Joint Bank Accounts

A joint bank account can be useful for household expenses, but couples should understand the bank's operating rules. Consider:

• who can withdraw funds;
• whether either person can operate the account alone;
• what happens if one partner dies;
• what happens if the account is frozen;
• what records exist showing each person's contributions; and
• whether personal savings should be kept separately.

Do not place all personal savings into a shared account simply because the relationship is long-term. Financial transparency and basic safeguards can coexist.

Businesses and Unmarried Partners

Operating a business together can create another layer of risk. Do not assume: "We built the business together, so I own half." Check the legal structure and ask:

• Who owns the company shares?
• Who is a director?
• Whose name is on the business registration?
• Who owns the equipment?
• Who owns the intellectual property?
• Is money contributed as equity or a loan?
• Who controls the bank account?
• What happens if one person leaves?
• What happens if one partner dies?

For foreign nationals, Thai foreign-business and work rules may also apply. An intimate relationship does not override company law.

Debts Between Unmarried Partners

Living together does not automatically mean every debt incurred by one partner becomes the debt of the other. However, a person can create personal liability by:

• borrowing jointly;
• signing as guarantor;
• signing finance agreements;
• mortgaging property;
• becoming a company director;
• entering contracts; or
• otherwise accepting legal obligations.

Children

Children of Unmarried Parents

Children create a separate set of legal questions. Do not assume that the parents' relationship status automatically determines every parental right. Thai law distinguishes between biological parentage and legal parental status. The position of an unmarried mother and unmarried father can differ, particularly concerning legal recognition of the father and parental power.

The Unmarried Father and Legitimation

Being named or recognised as the biological father does not necessarily mean an unmarried father automatically has every legal right associated with parental power. Thai law contains procedures concerning legitimation, which can be highly important for establishing an unmarried father's legal status.

Depending upon the circumstances, legitimation can arise through:

• subsequent marriage of the parents;
• registration in accordance with Thai law; or
• a court judgment.

The exact procedure and consequences should be checked where parental rights matter. This can become especially important when there is disagreement concerning:

• custody;
• schooling;
• passports;
• medical decisions;
• international travel; or
• relocation.

For detailed guidance on legitimation and parental power in Thailand, see the Child Legitimation guide and the Children and Family Rights guide.

Child Maintenance

The fact that parents were never married does not mean a child loses the right to financial support. The child's legal rights should be considered separately from disputes between the adults.

A parent should not assume: "We were never married, so I have no responsibilities." Equally, a parent seeking maintenance may need to establish the relevant legal relationship and pursue the appropriate procedure. For further information, see the Child Support guide.

Taking a Child Out of Thailand

International travel with a child can become particularly sensitive after separation. Do not assume that because you possess the child's passport you have unrestricted authority to permanently remove the child from Thailand.

Questions may arise concerning:

• parental power;
• legitimation;
• custody orders;
• consent;
• nationality;
• habitual residence; and
• foreign court proceedings.

Where parents disagree about international relocation, obtain advice before taking major action.

Separation, Inheritance and Wills

Separation When You Are Not Married

Unmarried couples do not obtain a divorce because legally there is no registered marriage to dissolve. But that does not mean separation is legally simple. Disputes may still involve:

• houses;
• land;
• condominiums;
• vehicles;
• bank accounts;
• businesses;
• loans;
• personal possessions;
• children;
• maintenance for children;
• debts; and
• overseas assets.

The legal analysis focuses on the rights attached to those particular assets and relationships rather than dividing matrimonial property through divorce. For guidance on divorce procedures where one person is married and separating, see the Foreign Divorce guide.

"Can I Get Half of Everything?"

There is no automatic rule giving an unmarried partner half of everything accumulated during the relationship. A claim may exist in relation to a particular asset depending upon ownership, financial contributions, agreements, contracts, evidence and other applicable law.

If One Unmarried Partner Dies

Death can expose one of the biggest differences between marriage and cohabitation. A surviving unmarried partner should not assume that they inherit in the same way as a legally married spouse. If the deceased dies without a valid will, Thai succession law determines who inherits. A long-term unmarried partner may not have the automatic statutory inheritance position that a legal spouse would have.

This can be devastating where the surviving partner:

• lives in a home owned by the deceased;
• contributed money towards that home;
• depended financially upon the deceased;
• helped build a business;
• believed they would inherit; or
• has a difficult relationship with the deceased's family.

Make a Will

For unmarried couples, estate planning can be particularly important. Consider making an appropriate Thai will dealing with Thai assets. Potential assets include:

• condominium;
• vehicles;
• bank accounts;
• company shares;
• personal possessions;
• investments; and
• rights under contracts.

International couples may also need wills or estate advice in other countries. A Thai will should not simply be assumed to control every overseas asset. For detailed guidance on wills and estate planning in Thailand, see the Wills and Estate Planning guide.

Life Insurance and Beneficiary Arrangements

Unmarried couples may also wish to review:

• life insurance;
• pension nominations;
• bank nominations where available;
• investment beneficiaries;
• company succession arrangements; and
• emergency financial planning.

Do not assume that describing somebody informally as a spouse automatically makes them the beneficiary of every policy or financial arrangement. Check the documentation.

Immigration and Medical

Immigration and Unmarried Partners

Cohabitation with a Thai national does not normally give a foreign partner the same immigration basis as being legally married to a Thai national. A foreign national should not assume that living together, being engaged, having a wedding ceremony, sharing a home or being together for many years automatically qualifies them for immigration permission based upon marriage.

Immigration status is determined by the applicable immigration category and current requirements. Having a Thai child may create different immigration considerations, but that is separate from simply being an unmarried partner.

Does Having a Thai Child Give Me Property Rights?

No automatic property right should be assumed merely because a foreign national has a Thai child. Parental rights, immigration status and property ownership are separate legal issues. A Thai child may have rights concerning inheritance or property, but that does not mean the foreign parent personally acquires Thai land ownership.

Be particularly cautious where somebody proposes placing land in a child's name as a method of circumventing restrictions on foreign ownership. Obtain independent legal advice before any such arrangement.

Medical Decisions and Emergencies

An unmarried partner should not automatically assume they have the same formal legal status as a spouse in every medical or administrative situation. Hospitals will deal with emergencies according to medical necessity, but questions concerning information, consent, decision-making and family involvement can become complicated when a patient lacks capacity.

Couples with particular concerns should consider appropriate legal and practical planning rather than relying solely upon "Everyone knows we're partners." Keep emergency contact information accessible.

Safety and Financial Risk

Domestic Violence Between Unmarried Partners

Marriage is not necessarily required before Thailand's domestic-violence protections can become relevant. The Domestic Violence Victim Protection Act B.E. 2550 (2007) includes certain people who live or previously lived together as a couple within its definition of family relationships.

An unmarried person experiencing physical violence, threats, coercion, psychological harm, confinement or other qualifying domestic abuse should not assume they have no protection because there is no marriage certificate.

For detailed guidance on protection orders, evidence, reporting and emergency resources, see the Domestic Violence in Thailand guide.

Financial Abuse and Control

Financial control can occur in unmarried relationships as well as marriages. Warning signs can include:

• confiscating bank cards;
• controlling all access to money;
• forcing a partner to transfer assets;
• demanding signatures on property documents;
• pressuring somebody to guarantee debts;
• taking passports or identification;
• preventing a partner from working;
• threatening to remove them from the home unless money is transferred; or
• using immigration insecurity to control them.

Where behaviour involves threats, violence, fraud or coercion, additional legal protections may apply.

Romance Scams and Long-Term Relationships

Not every romance scam is brief. A person can be financially exploited after months or years of apparent commitment. Warning signs may include:

• repeated family emergencies;
• constantly increasing debts;
• pressure to purchase land;
• unexplained business investments;
• urgent hospital claims;
• repeated requests for loans without documentation;
• resistance to independent legal advice;
• inconsistent explanations concerning ownership; and
• threats to end the relationship unless money is transferred.

None of these automatically proves fraud. But substantial financial decisions should be independently verified.

Practical Guidance

Before Moving Into a Property Together

Establish:

• who owns the property;
• who is paying the deposit;
• who pays rent and whose name appears on the lease;
• who owns furniture and pays for improvements;
• what happens to the deposit if one person leaves;
• what happens if one person leaves; and
• whether either person has a legal right to remain.

Where significant improvements are being made to property owned solely by the other partner, document the arrangement.

Before Buying or Building Property

A Cohabitation Agreement

Unmarried couples with substantial shared finances may consider documenting their arrangements in a properly prepared agreement. This may help record matters such as:

• ownership of particular assets;
• financial contributions;
• loans;
• household expenses;
• jointly purchased property;
• business interests;
• what happens to specified assets on separation; and
• other financial arrangements.

Protection Checklist

Practical Protection for Unmarried Couples

If the Relationship Is Ending

Before leaving or transferring substantial assets:

• secure copies of financial records;
• identify property ownership;
• obtain company documents;
• preserve evidence of loans and contributions;
• identify bank accounts;
• check debts and guarantees;
• preserve relevant communications;
• establish the legal position concerning children; and
• obtain advice before signing settlement documents.

Do not destroy, hide or unlawfully remove property belonging to the other person. Where personal safety is at risk, safety takes priority over financial documentation.

In Summary

Legal Basis and Authoritative Sources

This guidance has been prepared with reference to the following authoritative sources: