When a couple gets married, they choose a framework for assets and debts that, at that moment, seems obvious. Years later, with a mortgage, a business of their own, inheritances on the horizon, or a period of instability, it's natural to want to review that choice and understand what the law allows.
In Portugal, the answer is almost always no. Our system protects the stability of marriage and the rights of third parties, such as creditors and heirs, through the principle of... immutability. However, there are important exceptions and, above all, there are legal avenues to protect assets when the couple's circumstances change.
In this article you will understand when it is possible to change the marital property regime, what the law actually allows, what alternatives exist, and what mistakes are most costly.
What is the marital property regime?
The marital property regime is the set of rules that defines:
Which assets belong to each spouse and which are jointly owned?.
How does one respond to debts?.
How are assets divided in the event of a divorce?.
What protection exists in case of death?.
In Portugal, the most common regime, when there is no prenuptial agreement, is the community of acquired property. However, many couples choose separation of property or universal community of property, depending on their objectives and family context.
The general rule: you cannot change the marital property regime.
The starting point is straightforward: after marriage, it is not permitted to change the marital property regime by simple agreement between the couple.
This means that:
Going to the notary isn't enough.
It's not enough for the two of them to sign a document.
It's not enough to "agree" that from now on each person gets their own.
Even with complete trust and consensus, the principle remains. The law aims to prevent a couple from changing property rules mid-life, thereby harming third parties or creating legal instability.
However, there are situations in which the law allows for changes to the marital property regime. And this is where many people get confused.
When is it possible to change the marital property regime?
The law does not allow for a free change to any marital property regime. Exceptions exist, but they are limited and usually lead to a separation of assets regime. Below are the most relevant real-life scenarios.
1) Simple judicial separation of assets
This mechanism serves to protect a spouse when there is a serious risk of asset loss due to mismanagement by the other. In practical terms, a simple legal separation of assets can be requested when:
One of the spouses irresponsibly incurs debt.
There are hidden gambling, vices, addictions, or expenses.
There is a risk of asset dissipation.
The other spouse fears losing their own assets due to mismanagement.
It is a legal process and tends to be litigious. The court assesses the situation and, if it rules in favor of the applicant, the regime becomes that of separation of assets. In other words, the objective is not to "choose a new regime," but rather to protect assets by cutting off the sharing of property.
2) Legal separation of persons and property
This approach is different: it doesn't end the marriage, but suspends cohabitation and produces profound financial consequences. In practice, it can be a solution when the couple doesn't want to divorce immediately, but needs to separate assets and responsibilities.
The most important effect is this: the marital property regime becomes that of separation of property for as long as the legal separation remains in effect. It is, therefore, one of the ways in which it is possible to change the marital property regime.
3) Other legal cases of separation of assets during marriage
There are specific situations foreseen by law in which, during marriage, there may be a separation of assets for concrete reasons. These are less common cases, but they illustrate the logic of the system: there is only a change when the law expressly provides for it.
4) Revocation of special provisions made in a prenuptial agreement
Not all changes affect the core of the marital property regime. The law allows, under certain conditions, the revocation of provisions associated with inheritance agreements and specific clauses related to prenuptial agreements.
In most cases, this does not equate to "changing from joint ownership to separation" by free will. However, it can be relevant in estate and family planning.
What is not possible, even with agreement from both sides?
This is a point that deserves clarity, because it avoids unnecessary travel and dangerous decisions.
It is not possible to change the marital property regime to:
to change from a community property regime to a general community property regime by simple agreement.
To change from a joint ownership arrangement to a separation agreement by deed, without a court ruling.
to create a "mixed regime" after marriage.
altering the communication of goods with a private contract.
When you try to do this outside the system, the risk isn't just that the document will be ineffective. The risk is greater: there could be serious conflicts in divorce proceedings, problems with inheritances, and even difficulties with banks and creditors.
Why do so many couples want to change their marital property regime?
The desire to change the marital property regime rarely arises out of nowhere. It usually emerges when an event occurs that alters the relationship with money and risk.
Not all of these reasons justify a judicial change, but they all warrant a serious conversation about asset protection.
One of the spouses starts a business and assumes commercial risk.
The couple is buying a house and wants to separate the down payment and mortgage payments.
One of the spouses is going to receive an inheritance and fears a complication with their assets.
Hidden debts are starting to surface.
There is a second marriage and there are children from previous relationships.
One of the spouses changes professions and greatly increases their income.
The couple is entering a period of crisis and wants to "put the brakes" on their assets.
The problem is that many couples seek a quick fix, when the law requires a proper solution.
If I can't change the regime, how can I protect my assets?
Even when it's not possible to change the marital property regime, there are legal and practical measures that reduce risk and organize financial life. In many cases, these measures make the difference between a controlled divorce and a long conflict.
Separate what belongs to each person with proof and organization.
The law thrives on proof. And assets without proof often lead to conflict.
Keep proof of any assets you owned before marriage.
Keep records of inheritances and donations with clear identification.
Avoid mixing funds in accounts without proper monitoring.
Document entries for home purchase and amortizations.
If there is joint ownership, take good care of the registration and percentages.
For couples with assets, this organization is just as important as choosing a marital property regime.
Carefully choose what is registered in whose name.
In many scenarios, ownership and the method of acquisition help to avoid asset confusion. This does not alter the regime, but it influences the interpretation of the facts and records in case of conflict.
Address the division of assets and property division early when separation is inevitable.
When a marriage enters a critical phase, postponing decisions about assets often increases tension. If you are already considering separation or divorce, these issues go hand in hand:
list of common assets.
Identifying joint debts and personal debts.
appreciation of real estate and equity stakes.
The intended destination of the family home.
Use the appropriate route when there is serious risk.
If there is a real risk of financial loss due to mismanagement by the other party, the solution is not an informal agreement. The solution may involve judicial intervention.
And here the difference is crucial:
An "agreement" can fail when it's most needed.
A court decision creates legal effects and protection.
How does the process of changing to a separation of assets through legal means work?
When the law allows for a change in the marital property regime, it is not an automatic procedure. It is a process with requirements, formalities, and concrete effects.
Step 1: Understand what the risk is and what the route is.
Not all situations justify a simple legal separation of assets. Not all situations qualify for legal separation of persons and property. Therefore, the first step is to make a correct diagnosis.
Step 2: Gather evidence and map assets and debts.
Without proof, even a just reason can lose its force.
Relevant bank statements.
Credit agreements and guarantees.
property and vehicle registrations.
Company documents, quotas and liabilities.
Evidence of mismanagement or risk of dissipation.
Step 3: Proceed with the process and secure records.
The changes permitted by law must be reflected, where applicable, in records and in the actual assets. This is where many processes fail due to lack of monitoring.
Impacts of changing the marital property regime on debts.
This is one of the most frequent reasons why someone might want to change their marital property regime. The logic is simple: when the risk of debt increases, so does the need for protection.
But be aware: changing to a separation of assets through legal means does not erase existing debts or undo assumed responsibilities.
What can happen is:
to limit the creation of future joint ownership of assets.
to facilitate the distinction between joint debts and personal debts.
to reduce the exposure of the non-debtor spouse to new situations.
What if I'm planning to get married and want to avoid this problem?
Here's the best news from the article: most future heartache can be avoided before marriage.
If you are still planning to get married, you can choose a different marital property regime through a prenuptial agreement. This is the correct instrument to adjust the regime to the couple's reality and family expectations.
Before the list, a reminder: conventions serve to prevent conflicts, not to create them.
If one of the betrothed owns a business, the risk should be carefully considered.
If there are children from a previous relationship, asset protection is essential.
If there is significant family wealth, there should be planning.
If there are different expectations about accounts and investments, clarify.
Conclusion
Is it possible to change the marital property regime? In Portugal, the rule is clear: it cannot be changed by free will, nor by informal agreement, nor by mere deed.
But that doesn't mean being stuck in a dangerous situation. The law allows for exceptions, especially through judicial mechanisms that lead to the separation of assets, and there are practical alternatives to protect assets, organize evidence, and reduce exposure to debt.
If you are considering changing your marital property regime, treat the matter as it deserves: strategically, with evidence, and through the correct legal process. A couple's assets are not just money. They are the foundation upon which their stability rests. And when that foundation begins to tremble, the worst mistake is to improvise.
If you are considering starting a process, or if you just want to understand what the best option is for you, talk to a Solicitor.
