Spousal property
A prenuptial property agreement — often called a “prenup” — is the legal instrument allowing two people about to marry to design their own matrimonial property regime instead of defaulting to the statutory regime. Vietnamese law has recognised this type of agreement since the 2014 Law on Marriage and Family (Articles 47–52), with strict conditions on timing, form, and content. This article analyses in detail: who should make an agreement, the conditions for validity, what to include and what to leave out, legal limits, and how the agreement operates when the marriage ends or when disputes with third parties arise.
What is a prenuptial property agreement?
Vietnamese law provides two matrimonial property regimes: the statutory regime (Articles 33–46), applied by default when spouses have no other agreement, and the agreed regime (Articles 47–52) — established by the marrying couple before the wedding. A prenuptial property agreement is the document in which two people about to marry agree on property matters, including: which assets are common property, which are each party’s separate property; the rights and obligations of the wife and husband regarding each type of property; the principles for dividing property when the marriage ends; and other property-related contents.
The core difference from the statutory regime: under the default regime, all assets created during the marriage are common property by default and divided under Article 59 upon divorce; under an agreement, the parties can “rewrite the rules” for themselves — for example, agreeing that each party’s income during the marriage is separate property, or that a specific business asset block belongs to one party’s sole disposition. This freedom is not absolute: the law sets limits to protect the weaker party and the interests of children and family — analysed in the limits section below.
Who should make a prenuptial property agreement?
Not every couple needs a prenup, but for some groups, not having one means accepting major risk. The first group: business owners or holders of significant capital contributions — because profits, dividends, and the increased value of the business during the marriage may be deemed common property, and upon divorce the other party may claim a corresponding share of value, disrupting control of the business. The second group: people with high-value pre-marital assets (real estate, family assets) who want to ensure those assets are not “communalised” through mixing during the marriage.
The third group: people who have divorced and are entering a second marriage, wanting to protect assets for their own children. The fourth: couples with large disparities in assets or income, or where one party has debt obligations or high business risks the other does not want to share. The fifth: couples with foreign elements — differences between countries’ laws on matrimonial property regimes make a clear agreement all the more necessary (see spousal property with foreign elements). For the rest, if assets are simple and both parties trust each other, the statutory regime works well — but even then, a consultation to understand how the “default law” applies to you is worthwhile.
Validity conditions: timing, form, content
Article 47 sets three mandatory formal conditions. First, timing: the agreement must be made before marriage. A document made after marriage registration is no longer a “prenuptial agreement” but falls under agreements during the marriage (Article 49) — with different legal consequences. Second, form: the agreement must be in writing and notarised or certified. A handwritten document without notarisation, even signed by both parties, does not meet the validity conditions. Third, effectiveness: the agreement takes effect from the date of marriage registration.
On content, Article 48 lists the basic contents the agreement must have: assets identified as common property and each spouse’s separate property; the rights and obligations of the wife and husband regarding common property, separate property, and related transactions; assets reserved for the family’s essential needs; and the conditions, procedures, and principles for dividing property when the property regime ends. Drafting practice shows good agreements go beyond the Article 48 framework to detail: how fruits and yields are handled; how one party’s investment of separate property into common property is treated; the mechanism when one party wants to amend the agreement; and debt clauses — which obligations are common, which are separate.
What should be included
A quality prenup should cover the practical realities of married life, not just list existing assets. First, each party’s separate-property inventory at the time of marriage — with supporting documents, as a basis for later comparison. Second, rules for assets created during the marriage: whether each party’s income is common or separate; who owns assets bought with that income; how business and investment profits of each party are handled. Third, rules on fruits and yields from separate property — since by default they may be common property, they must be expressly agreed as separate if that is desired.
Fourth, allocation of financial obligations: which debts are common, which are separate; payment responsibility when one party borrows for investment or business. Fifth, division principles upon divorce or death of a party: in what ratios, which party gets priority for which assets, valuation and difference-payment mechanisms. Sixth, periodic review clauses: the agreement should have a mechanism for review after a number of years or upon major events (birth of a child, buying a common house, one party quitting work) — because life changes and a rigid agreement may become unfair. See the overview of establishing separate property at establishing separate spousal property.
Legal limits
Article 50 sets limits every agreement must respect, failing which it will be declared void in whole or in part. Agreements must not violate legal prohibitions or contravene social ethics — for example, they cannot provide that one party may commit adultery without being deemed at fault upon divorce. Agreements must not seriously infringe the rights to maintenance, inheritance, and other legitimate rights and interests of parents, children, and other family members — for example, they cannot strip the maintenance obligation for minor children upon divorce, or leave one party entirely unable to support themselves and their children.
In addition, agreements must satisfy the general validity conditions for civil transactions under the Civil Code: full civil act capacity, complete voluntariness, and purposes and contents that do not violate legal prohibitions or social ethics. Practice shows voided agreements usually fall into two groups: coercion (one party pressured to sign right before the wedding with no way to refuse — courts may examine the voluntariness factor) and grossly unfair content (one party keeps all assets while the other ends up with nothing despite years of sacrificed career caring for the family). The lesson: the more balanced, transparent, and independently advised for both parties the agreement is, the more robust it stands before the court.
Amending, supplementing, and terminating the agreement
A prenup is not “set in stone”. Article 49 allows spouses to amend or supplement the agreement during the marriage, with form conditions similar to Article 47 — a notarised or certified written document. Amendments take effect as agreed by the parties, but note the effect on third parties: transactions already established with third parties before the amendment remain governed by the old agreement, unless the third party knew or was required to know of the amendment.
On termination, Article 51 provides that a spousal property regime agreement may be declared void in part or in whole by the court when it violates the conditions in Article 50 and the validity conditions for civil transactions. When the agreement is declared void, the spousal property regime is determined under the statutory regime — i.e. all prior allocations may be reversed. This is why the initial drafting must be thorough: an agreement with “holes” in its validity conditions not only loses effect but throws the parties back into the default regime they sought to avoid.
Prenups and third parties
A practical question: does an agreement between two spouses bind banks, business partners, or creditors? Article 52 provides: in transactions with third parties, the wife and husband must provide the third party with the relevant information; if they breach this duty, the third party is deemed bona fide and their rights protected under the Civil Code. In other words, the agreement only works against third parties when they knew or were required to know about it.
The practical consequence: when one party uses separate property (under the agreement) in transactions with banks or partners, they should proactively present the notarised property-regime agreement. Otherwise, a bona fide third party is protected and the spouses cannot invoke the agreement to refuse obligations. For high-value transactions, registering or publicising the agreement under the secured-transaction registration mechanism (if available) should also be considered — discuss with a lawyer the option suited to the specific asset type.
What if there is no prenup?
Without an agreement, the statutory property regime (Articles 33–46) applies automatically: assets created during the marriage are common property; separate property is limited to the categories in Article 43; division upon divorce follows Article 59; assets not proven separate are deemed common. For many families with simple assets, this regime operates smoothly and fairly.
However, even after marriage without an agreement, the law leaves a “back door”: spouses may agree to divide common property during the marriage (Articles 38–42) — dividing part or all of the common property, with the divided portions becoming each party’s separate property. This is a flexible tool to “correct course” when reallocation is recognised as needed, for example when one party is about to make a major investment and the other does not want to share the risk. See the in-depth analysis at postnuptial property agreements. For the overall spousal-property service framework, see divorce & division of high-value assets.
FAQs
Is a prenup seen as “distrust” and does that affect validity?
The law does not assess the emotional motives of an agreement — only its validity conditions (voluntariness, civil act capacity, notarised/certified form, contents not violating prohibitions or social ethics). In practice, families with significant assets increasingly treat this as normal risk management, like buying insurance. What matters is that both parties are independently advised and sign completely voluntarily, avoiding any coercion before the wedding.
Is a handwritten agreement signed by both parties but not notarised valid?
No. Article 47 requires the agreement to be in writing and notarised or certified — a mandatory formal condition. A handwritten, non-notarised document does not create an agreed property regime; in disputes, the court will apply the statutory regime. If both parties have signed a handwritten document, take it for notarisation/certification before marriage registration for it to take effect.
Can we agree that all income during the marriage of each party is separate property?
In principle, the parties are free to agree on the property regime within the framework of Article 48 and the limits of Article 50. However, the agreement must ensure it does not seriously infringe the legitimate interests of the other party, child maintenance obligations, and the family’s essential needs. An agreement leaving one party (for example, one who quit work to raise children) with no assets at all after years of marriage risks court review of its fairness in disputes. Design a balanced mechanism, for example combining separate property with a common fund for family needs.
Is a prenup effective abroad?
It depends on the law of the country where the assets are located or where the dispute is resolved. Some countries recognise spousal property agreements validly made abroad; others require their own formalities (for example, registration with a competent authority). For couples with foreign elements or assets in multiple countries, the effectiveness should be reviewed under each relevant legal system at the drafting stage — see spousal property with foreign elements.
We are already married and now want an agreement — what can we do?
The law does not allow making a “prenuptial agreement” after marriage, but two substitute tools exist: agreeing to amend or supplement the property regime (if an agreement already existed — Article 49) and agreeing to divide common property during the marriage (Articles 38–42) — allowing spouses to divide part or all of the common property, with divided portions becoming separate property. Both require written documents and, for real estate, notarisation/certification. See details at postnuptial property agreements.
Useful links
Talk to a lawyer at FLAT LAW FIRM
A prenuptial agreement only protects you when it is valid and stands up in court. Talk to us when:
- You are about to marry and want to design a property-regime agreement suited to your asset structure.
- You need to review an agreement proposed by the other party or their family.
- You want to amend or supplement the agreement during the marriage.
- Your agreement involves assets abroad or a foreign party.
- A dispute has arisen over the validity or application of the agreement.
The content on this website is for general information only and does not substitute legal advice for specific cases.
Legal regulations, the competence of state authorities, and administrative procedures may vary over time, by locality, and by file. Clients should consult a lawyer before making decisions or transactions.
