Prenup Is Teetering. The Postnup Isn’t Prepared. Get One for Your Marriage in Indonesia.

A Marriage Agreement Is Not Just a Pre-Wedding Document

Many couples in Indonesia hear “prenup” and assume that everything must be decided before the wedding. That is no longer the whole story.

A prenuptial agreement, or perjanjian perkawinan, is usually made before or at the time of marriage. A postnuptial agreement is made after the marriage has already taken place. Both agreements can regulate property, debts, businesses, inheritance planning, and financial responsibilities.

If your prenup is incomplete, unclear, or never signed, that does not necessarily mean you have no legal options. Indonesia’s legal framework now gives married couples a route to create an agreement after the wedding. The important point is simple: do not wait until divorce, a business collapse, or a property dispute forces you to deal with the problem.

What the 1974 Marriage Law Says

The main starting point is Law No. 1 of 1974 on Marriage. Article 29 originally described a marriage agreement as a written agreement made before or at the time of marriage. The agreement could regulate the spouses’ property arrangements, provided that it did not violate the law, religion, or public morality.

Under the general property rules in Articles 35 and 36, property acquired during marriage is generally treated as joint property. Property owned before marriage, as well as property received individually as a gift or inheritance, generally remains under the control of the relevant spouse unless the parties agree otherwise.

This default system works for some couples. But it can create serious complications for others. One spouse may operate a business, carry substantial debt, own family property, work in a high-risk profession, or have an international financial life. If everything acquired during marriage is treated as joint property, the financial consequences can become messy very quickly.

That is why a properly drafted postnuptial agreement can be useful.

The Constitutional Court’s Breakthrough Decision

The major legal breakthrough came through Constitutional Court Decision No. 69/PUU-XIII/2015.

The Constitutional Court expanded the meaning of Article 29. It confirmed that a marriage agreement may be made:

1. before the marriage;
2. at the time of the marriage; or
3. during the marriage.

The agreement may be approved by the marriage registrar. The Court also recognized that the agreement may begin operating at a time agreed by the spouses, rather than automatically only from the wedding date.

This was a major shift. Before the decision, couples who discovered a need for asset separation after marriage faced a much narrower legal path. After the decision, married couples can respond to changing circumstances.

Maybe one spouse starts a company. Maybe the couple plans to buy land. Maybe one spouse becomes responsible for significant business debt. Maybe a foreign spouse’s citizenship creates land-ownership concerns. These are practical reasons why a couple may need a postnuptial agreement.

The Agreement Cannot Harm Third Parties

There is an important limit: a postnuptial agreement cannot be used to unfairly harm third parties.

The Constitutional Court emphasized that changes or cancellation of a marriage agreement require the consent of both spouses and must not prejudice third parties. Third parties may include creditors, banks, business partners, tax authorities, or anyone who has acquired a legal interest connected to the spouses’ property.

You cannot borrow money while presenting your assets as jointly available, then secretly sign a postnup to remove those assets from the creditor’s reach. That is not smart asset planning. It is a litigation invitation.

For this reason, the agreement should clearly state its effective date, identify existing assets and debts, and explain whether it applies only to future property or also reorganizes property acquired earlier.

The Islamic Compilation of Law

For Muslim couples, the Islamic Compilation of Law, or KHI, is especially relevant. The KHI was distributed through Presidential Instruction No. 1 of 1991 and is regularly used by Religious Courts.

The KHI recognizes both joint marital property and separate property. Articles 85 to 97 regulate marital property, including property brought into the marriage, gifts, inheritance, management of joint assets, and division after divorce.

Article 87 generally provides that property brought into the marriage and property acquired individually through gifts or inheritance remains under the control of the relevant spouse, unless the parties determine otherwise.

Article 92 is also important because legal actions concerning joint property generally require mutual consent. Selling, transferring, mortgaging, or otherwise burdening joint property without the other spouse’s agreement can create major legal problems.

Article 97 provides a general rule that divorced spouses are each entitled to one-half of the joint property, unless another arrangement has been made through a marriage agreement. A postnuptial agreement can therefore change the default arrangement, provided its terms remain legally valid and do not conflict with applicable Islamic principles.

What Should Your Postnup Cover?

A weak postnup usually says something broad like, “The parties agree to separate their assets.” That is not enough. The document should be specific.

It should address:

1. property owned before marriage;
2. houses, apartments, land, and other real estate;
3. salaries, bonuses, and professional income;
4. shares, dividends, investments, and digital assets;
5. business ownership and intellectual property;
6. inheritance and gifts from family members;
7. personal loans, credit cards, guarantees, and business debt;
8. responsibility for taxes and household expenses;
9. authority to sell, mortgage, lease, or transfer property;
10. the treatment of future assets; and
11. the process for amending or ending the agreement.

I would also include a clear financial disclosure clause. Each spouse should honestly disclose significant assets and liabilities before signing. A contract built on hidden information is not much of a contract.

Land and Mixed Marriages

Land ownership is one of the biggest reasons some couples need a postnuptial agreement.

Under the 1960 Agrarian Law, certain land rights, especially Hak Milik, are generally reserved for Indonesian citizens. In a marriage between an Indonesian citizen and a foreign national, ordinary marital-property rules may create uncertainty because assets acquired during marriage could be treated as joint property.

Government Regulation No. 18 of 2021 recognizes that an Indonesian citizen married to a foreign national may hold land rights like other Indonesian citizens, provided the land is not joint property and this is proven through a notarized separation-of-property agreement.

This is not a loophole for foreign ownership. It is a legal mechanism designed to protect the Indonesian spouse’s rights. If land or property is involved, the postnup may be prepared with legallawyer  assistance from a lawyer at Wijaya & Co.,  and coordinated with the relevant Land Office, bank, developer, or PPAT.

Your Children and Your Privacy

A postnuptial agreement may regulate how spouses share education, housing, medical, insurance, and household expenses. But it cannot remove mandatory legal responsibilities toward children. The child’s welfare remains the priority.

The agreement should also protect sensitive information. Identity cards, family documents, tax records, financial statements, and health information are personal data. Law No. 27 of 2022 on Personal Data Protection supports careful handling of this information by lawyers, courts, and government offices.

A confidentiality clause is useful, but it cannot block disclosure required by law or a lawful court, tax, banking, or enforcement process.

Conclusion: Prepare Before the Crisis

A postnuptial agreement is not an admission that your marriage is failing. It is a way to make the financial rules clear while you and your spouse still trust each other enough to discuss them calmly.

The 1974 Marriage Law provides the foundation. The Constitutional Court’s 2015 decision opened the door for agreements during marriage. The Islamic Compilation of Law explains joint and separate property for Muslim couples. Newer land and data-protection rules add further reasons to prepare the document carefully.

So if your prenup is teetering, do not pretend the problem will disappear. If your postnup is not prepared, get one drafted properly. Use an Indonesian lawyer from Wijaya & Co., and, where the assets or risks are significant, obtain independent legal advice for both spouses.

Love may begin a marriage. Clear legal planning helps protect it when life gets complicated.

This post is for general information only and is not a substitute for advice from an Indonesian qualified lawyer.