Prenuptial and Postnuptial Agreements for Mixed-Nationality Couples in Indonesia

By Jeremy Jordan, S.H. — licensed Indonesian advocate (advokat), DPN Indonesia, NIA 25.25.32730 · Reviewed 9 October 2026

Why this matters in a mixed marriage

Under Indonesia's Marriage Law, a mixed marriage is a marriage between two people who, in Indonesia, are subject to different laws because they hold different citizenships, one of them being Indonesian (Law 1/1974, Article 57). This guide is for the Indonesian spouse in that marriage, and for the foreign spouse who wants to understand what is at stake.

Without a marital agreement, property acquired during the marriage becomes joint property (harta bersama), and either spouse may deal with joint property only with the consent of both (Law 1/1974, Articles 35(1) and 36(1)). Property each spouse brought into the marriage, and gifts or inheritances each receives, stay under that spouse's own control unless the spouses agree otherwise (Article 35(2)).

The land problem: Hak Milik and HGB

Only Indonesian citizens can hold Hak Milik, Indonesia's strongest land title. A foreigner who acquires Hak Milik through the mixing of property by marriage must release it within one year; if it is not released in time, the right lapses by operation of law and the land passes to the State, while rights of others that burden it continue (Basic Agrarian Law 5/1960, Article 21(1) and 21(3)). HGB (right to build) is likewise limited to Indonesian citizens and Indonesian legal entities, with a parallel one-year rule for a holder who does not meet the requirements (Article 36(1) and 36(2)).

Government Regulation 18/2021 addresses this directly: an Indonesian citizen married to a foreigner may hold the same land rights as any other Indonesian citizen, and that land right is not joint property — which is proven by a separation-of-property agreement between husband and wife made by notarial deed (Article 70). That regulation also revoked the earlier rule on foreigners' homes, Government Regulation 103/2015 (Article 103).

The marital agreement opens this route for the Indonesian spouse. It does not open land ownership to the foreign spouse: in the same Constitutional Court case that allowed agreements during marriage, the Court held the challenge to the Hak Milik and HGB nationality rules to be without legal merit (Constitutional Court decision 69/PUU-XIII/2015).

Before or during the marriage: what MK 69 changed

The printed 1974 text of Article 29 still says an agreement is made "at or before" the wedding. In decision 69/PUU-XIII/2015, pronounced on 27 October 2016, the Constitutional Court ruled that the article must be read differently, so the statute should always be read together with that decision:

• the spouses may make a written agreement at the time of the marriage, before it, or during the marriage, ratified by the marriage registrar or a notary, after which its contents also apply to third parties so far as they are involved;
• the agreement takes effect from the date of the marriage, unless the agreement itself provides otherwise;
• during the marriage it may cover marital property or other matters, and it cannot be changed or revoked unless both spouses agree and the change or revocation does not harm third parties.

An agreement cannot be ratified if it breaches the limits of law, religion or morality (Law 1/1974, Article 29(2)).

Form and registration

For recording with the civil registry (Disdukcapil), the requirements list an agreement made as a deed by a notary based in Indonesia, the spouses' marriage certificate (or its foreign-issued equivalent), and copies of identity and family-card documents (Minister of Home Affairs Regulation 108/2019, Article 99(1)). Recording is available for agreements made before or at the wedding, agreements made during the marriage, agreements made in Indonesia for a marriage registered abroad, and later changes or revocations (Article 98).

The civil registry then makes a marginal note on the marriage register and the couple's marriage certificate — or, where the marriage was registered in another country, issues a certificate instead (Article 99(2)).

For Muslim couples whose marriage is registered at the Office of Religious Affairs (KUA), the current rule says the agreement may be made before, at or during the marriage, is made before a notary, and must not conflict with Islamic law or statute; the head of the KUA (or the marriage registrar at an Indonesian mission abroad) records it in the marriage deed and marriage book, noting the deed number, the notary and the date (Minister of Religious Affairs Regulation 30/2024, Articles 39 and 40).

What a postnup can and cannot do against third parties

In describing why couples make these agreements, the Constitutional Court listed separating the spouses' assets, each spouse answering for the debts they incur, selling one's own property without the other's permission, and pledging assets in one spouse's name for credit without the other's permission (decision 69/PUU-XIII/2015).

The law also protects people outside the marriage. The agreement's contents reach third parties so far as they are involved, and a change or revocation during the marriage must not harm third parties (Law 1/1974, Article 29(1) and 29(4), as read by the Court). Separately, the Civil Code allows creditors to challenge acts a debtor was not obliged to perform that prejudice them, where both the debtor and the other party knew of the prejudice (Civil Code, Article 1341).

In practice, treat a postnup as a planning tool for the future, not as a way to place assets beyond the reach of people you already owe.

Married abroad? Register the marriage in Indonesia

A marriage celebrated abroad between an Indonesian and a foreigner is valid if it followed the law of the country where it took place and, for the Indonesian spouse, did not breach the Marriage Law. Within one year after the couple returns to Indonesia, proof of the marriage must be registered at the marriage registry where they live (Law 1/1974, Article 56).

The population-administration law adds a shorter step: the marriage must be recorded with the competent authority abroad and reported to the Indonesian mission, and then reported to the civil registry where they live no later than 30 days after returning to Indonesia (Law 23/2006, Article 37(1) and 37(4)); late reporting is subject to an administrative fine (Article 90(1)). The civil registry records the report and issues a reporting certificate (Minister of Home Affairs Regulation 108/2019, Article 97). For Muslim couples, proof of a marriage registered by a foreign government is registered at the KUA where the couple lives no later than one year after returning (Minister of Religious Affairs Regulation 30/2024, Article 33(2)).

If you married abroad and want a marital agreement, the agreement can be made in Indonesia and recorded even though the marriage itself was registered in another country (Minister of Home Affairs Regulation 108/2019, Article 98).

Practical points: timing, contents, existing property

• Sign before you buy. The regulation ties an Indonesian spouse's separate land right to proof by a notarial separation agreement, so put the agreement in place before any land or apartment purchase, not after.
• State the start date. Because an agreement takes effect from the marriage unless it says otherwise, a postnup should say expressly from when it applies and how property acquired before signing is to be treated.
• Decide the scope: assets only, or assets and debts; full separation or separation of particular property. During the marriage the agreement can also cover matters other than property.
• List existing property and keep the evidence. What each of you owned before the marriage stays under your own control by default, but you may later have to prove what was brought in and when.
• Use a bilingual deed both of you understand, signed before a notary in Indonesia, and finish the registration step — marginal note, certificate or KUA record — rather than stopping at the deed.

The honest take

A marital agreement is the lawful tool the Marriage Law, as read by the Constitutional Court, gives a mixed-nationality couple, and it is what Government Regulation 18/2021 asks for before an Indonesian spouse holds land as separate property. It does not make Hak Milik or HGB available to the foreign spouse, it does not override the rights of third parties, and registration offices work to their own timetables. If you already hold property, or you married abroad and never reported the marriage here, have your documents reviewed before you sign or buy anything new.

General information only, not legal advice for your situation. No result is guaranteed. Speak to a lawyer about your specific facts.