For years, couples in Indonesia were told that a marriage agreement had to be signed before the wedding. Miss that deadline, and the door seemed closed. That was a serious problem for mixed-nationality couples, business owners, and anyone who realized only after marriage that separating property might be a very good idea.
Today, the legal position is more flexible. A postnuptial agreement, or perjanjian perkawinan setelah perkawinan, is now legally possible in Indonesia. But I would not call the process effortless. “Doable” is fair. “Simple” is optimistic.
The change mainly comes from Constitutional Court Decision No. 69/PUU-XIII/2015, which reinterpreted Article 29 of Law No. 1 of 1974 on Marriage. The decision allows spouses to make a marriage agreement before, at the time of, or during the marriage. That means a married couple can now agree to separate their property after the wedding.
Why Postnups Matter
Under Article 35 of the 1974 Marriage Law, property acquired during a marriage is generally treated as joint marital property. Property obtained through inheritance or gift may remain under the control of the receiving spouse. Without a marriage agreement, however, the default rules can create uncertainty about who owns what.
That uncertainty becomes more serious when one spouse is a foreign national. A mixed marriage can affect land ownership, business assets, inheritance, taxes, debt exposure, and the ability to buy property in Indonesia.
Imagine an Indonesian citizen marries a foreign national and later wants to purchase land. Under ordinary Indonesian property rules, the foreign spouse cannot hold certain land rights. If the marriage automatically creates joint property, officials may question whether the foreign spouse indirectly owns an interest in the land.
A properly drafted separation-of-property agreement may help protect the Indonesian spouse’s legal ownership. It does not give the foreign spouse a right to own restricted land, and it cannot be used as a nominee arrangement. But it can help demonstrate that the asset belongs separately to the Indonesian spouse rather than forming part of a joint marital estate.
What the Constitutional Court Changed
The Constitutional Court considered the position of Indonesian citizens married to foreign nationals who could not obtain certain land rights because they had no marriage agreement separating property.
Before the decision, Article 29 was generally understood to permit a marriage agreement only before or at the time of marriage. The Court found that this interpretation could unfairly restrict constitutional property rights. It therefore expanded the provision.
Under the Court’s interpretation, both spouses may make a written agreement before, at the time of, or during the marriage, provided that they agree voluntarily. The agreement must be approved or authenticated through the legally recognized process, involving the marriage registrar. Once properly recorded, its contents may also bind third parties when the third party is legally concerned.
That last point matters more than people realize. A postnup is not only a private promise between husband and wife. It may affect creditors, banks, buyers, business partners, and government offices. If the agreement is hidden in a drawer and never properly recorded, it may not protect you when it matters most.
The Complication: The KHI Was Written Earlier
For Muslim couples, the Compilation of Islamic Law, or KHI, is also relevant. The KHI was disseminated through Presidential Instruction No. 1 of 1991 and is used as a reference in the Religious Courts.
Articles 45 through 52 of the KHI address marriage agreements. Article 45 recognizes a marriage agreement in the form of taklik talak or another agreement that does not contradict Islamic law. Article 47 discusses an agreement concerning the position of property in the marriage. It allows the spouses to regulate the mixing or separation of personal property and property acquired during the marriage, as long as the arrangement does not contradict Islamic principles.
Articles 85 through 97 deal more generally with marital property. The KHI recognizes the concept of harta bersama, or joint property, while also recognizing property belonging separately to each spouse. Article 97 traditionally provides that, after divorce, each spouse receives half of the joint property unless another arrangement applies.
Here is the awkward bit: the KHI provisions were drafted around the older understanding that a marriage agreement was made before or at the wedding. The Constitutional Court’s decision came later and expanded Article 29 of the Marriage Law to include agreements made during the marriage.
That creates a legal and administrative gap. The constitutional rule supports postnuptial agreements, but some offices and practitioners may still rely on the older wording of the KHI. So, yes, a postnup is legally possible for Muslim couples, but the drafting, approval, and registration need to be handled carefully.
The Agrarian Law Is the Real Pressure Point
Law No. 5 of 1960 on Basic Agrarian Regulations, commonly known as the Agrarian Law, controls the main land-right categories in Indonesia.
Article 21 generally limits Hak Milik, or ownership rights, to Indonesian citizens, with limited exceptions. Article 36 addresses Hak Guna Bangunan, or building-use rights, and also limits who may hold them. Foreign nationals generally cannot hold these rights in the same way Indonesian citizens can.
The problem is not merely whether the foreign spouse’s name appears on the land certificate. The issue is whether the foreign spouse may be considered to have a beneficial or marital interest in the property.
This is why the Constitutional Court’s decision was so important. It allowed spouses to create a separation-of-property regime even after marriage. For an Indonesian citizen in a mixed marriage, that can provide a legal basis for owning and managing assets without automatically treating them as joint property with the foreign spouse.
But a postnup is not a magic eraser. It does not automatically fix a land transaction that was already unlawful. It does not legalize a nominee arrangement. It does not override the Agrarian Law. It also does not guarantee that every land office, bank, will accept the document without additional review.
What Can a Postnup Cover?
A well-drafted postnup can address far more than a basic sentence saying, “Our assets are separate.”
It can identify property owned before the marriage, explain how future income will be treated, separate business interests, regulate bank accounts, address debts, identify responsibility for taxes, and describe how Indonesian property will be managed.
For a mixed marriage, it should also address the nationality-sensitive nature of Indonesian land and business ownership. The document should make clear that neither spouse is trying to bypass restrictions on foreign ownership.
The agreement may also explain what happens to existing joint property. This is where the drafting becomes delicate. A postnup signed halfway through a marriage cannot pretend that the earlier years never happened. The parties should identify whether property acquired before the agreement remains joint, is divided, or becomes separately owned from a specified date.
Existing creditors must also be considered. A postnup should not be used to move assets away from creditors after debts have already arisen. The Constitutional Court’s wording protects third parties, and that protection is not decorative.
How Do You Make It Effective?
The agreement should be made in writing and signed voluntarily by both spouses. Each spouse should provide honest financial disclosure and receive enough time to review the terms. Independent legal advice is strongly recommended, especially if one spouse is foreign or has substantially greater assets.
For Indonesian purposes, I would usually recommend working with an Indonesian legal expert like Wijaya & Co who understands mixed marriages, marital property, and land law. The lawyers at Wijaya & Co can help ensure that the agreement uses legally appropriate language and can explain the registration requirements.
If the couple is Muslim, the agreement should also be checked against the KHI and Islamic principles. If the marriage is registered through the Religious Affairs Office, the relevant marriage-registration authority may need to be involved. If the marriage is recorded through Dukcapil, the civil-registration process may be different.
The agreement should be recorded with the appropriate authority so that it can be reflected in the marriage record and relied upon against third parties. This is one of the most common weak points in postnup planning: people obtain a document but fail to complete the publicity and registration steps.
So, Is It Worth Doing?
My view is yes, especially if you are in a mixed marriage, own Indonesian land, operate a business, have substantial assets, or want to protect financial independence. A postnup can be much better than having no agreement at all.
But I would not sign a generic template downloaded from the internet. That is how people create documents that sound impressive and fail when presented to land office, bank, or court.
The best postnup is specific, transparent, and realistic. It should explain what property is separate, what property is joint, what happens to existing assets, and how the agreement will be registered.
The bottom line is that Indonesia is now in the doable era for postnuptial agreements, thanks largely to Constitutional Court Decision No. 69/PUU-XIII/2015. The 1974 Marriage Law gives the main statutory foundation, the KHI remains important for Muslim couples, and the 1960 Agrarian Law explains why property separation can be crucial in mixed marriages.
So, yes, you can make a postnup during the marriage. Just do not confuse legal possibility with administrative simplicity. In Indonesia, the agreement is only the beginning. Proper drafting, registration, and compliance with land and third-party rules are what make it useful.
My name is Asep Wijaya, writing for Wijaya & Co. We orchestrate to assist you navigate. Thank you for reading my posts.