União Estável in Brazil: Stable-Union Rights, Property & Asset Protection
Attorney’s Quick Answer
A união estável (stable union) is Brazil’s legally recognized domestic partnership — a continuous, public relationship that two people live as a family, with no ceremony and no minimum duration required. For property and inheritance it is treated much like marriage: unless you sign an agreement choosing otherwise, it defaults to partial communion of property, so assets built during the union are shared 50/50 — even if the union was never registered. Since a 2017 Supreme Court decision, a surviving partner inherits on the same footing as a spouse. The practical upshot: a stable union can create (or expose) real financial rights without a single document being signed — which is exactly why it is worth getting on paper, on your terms.
Reviewed by Luciano Oliveira, Esq., LL.M. — attorney admitted in Brazil, Texas, and California. Last reviewed: July 2026.
This is general legal information, not legal advice, and reading it creates no attorney-client relationship. Whether a stable union exists, and what it means for your assets, is fact-specific — confirm your situation with counsel.
What is a união estável?
A stable union is recognized when a couple lives together in a relationship that is continuous, public, and lasting, with the intention of forming a family. Unlike marriage, it needs no wedding, no officiant, and no fixed amount of time — a couple can meet the definition without ever having “made it official.” It can be formalized at a notary by a public deed (escritura pública de união estável), but it can also exist purely as a matter of fact and be recognized later by a court. Stable unions apply equally to same-sex couples, recognized by the Brazilian Supreme Court in 2011.
Two kinds of união estável: the one you create, and the one that finds you
Here is the idea that surprises foreign couples most. In Brazil, recognizing a stable union is always declaratory, never creative — a notary deed, a registry entry, or a court judgment does not create the union, it simply confirms a family status the law attaches to the facts of your relationship. That single principle is why a união estável can arise in two very different ways: one you choose, and one that can be imposed on you.
1. The union you create — the proactive route
This is the deliberate path, and the closest Brazilian equivalent to a US civil union or domestic partnership. You and your partner sign a public deed of stable union (escritura pública declaratória de união estável) before a notary, and — under recent national rules — you can also register it at the civil registry (the “Livro E”). Two things make this worth doing:
- It fixes the start date of the union on the record.
- It lets you choose your property regime through a cohabitation agreement (contrato de convivência). Without that written agreement, the default partial-communion regime applies and assets built during the union are shared 50/50; with it, you can, for example, choose full separation so each partner keeps their own.
One trap to avoid: a private, unregistered contract binds the two of you, but it will not protect you against the other partner’s creditors, or against heirs, unless it is given publicity by public deed and registration — Brazil’s Superior Court of Justice has held exactly that. If you want your chosen regime to hold up against third parties, register it. And note that a stable union is not automatically marriage: to become married you formally convert it (conversão em casamento), which keeps your existing regime unless a prenup says otherwise.
2. The union that finds you — the imposed route
Because a stable union arises from facts, a court can declare that one existed even though you never signed anything. A former partner can file an action to recognize (and dissolve) a union — and, after a death, a surviving partner can sue the deceased’s heirs to have the union recognized, unlocking a property share and inheritance. Because recognition is declaratory, the effects reach back to when the relationship factually began, not the date of the judgment.
What a court looks for (Civil Code art. 1.723) is a relationship that was public, continuous, and lasting, lived with the present intention of forming a family. There is no fixed minimum time — the old five-year rule is long gone, and judges weigh the facts case by case. The evidence is anything that shows a shared family life: a common address, joint accounts, naming each other as dependents or beneficiaries, joint purchases, travel and social-media history, witnesses — and children together are especially powerful.
The main way to defeat such a claim is to show the relationship was a “qualified dating” (namoro qualificado) — serious, even living together, but without the present intent to build a family (the plan was projected to the future, not executed in the present). Brazil’s Superior Court of Justice has drawn exactly this line. Note too that a still-married person who has not separated cannot form a stable union — that is concubinato — and Brazil generally will not recognize two simultaneous unions.
If a union is recognized, the consequences are real and retroactive: absent an agreement, the default partial-communion regime gives the partner half of what was built during the union, and since the 2017 Supreme Court ruling the surviving partner inherits like a spouse.
This is why the proactive route matters even when you feel settled: a dated cohabitation agreement is the cleanest way to define — or cap — what a future claim could reach. Labels alone will not save you (a court follows the facts over a “dating contract”), but a properly signed and registered agreement is your strongest form of control.
What a stable union means for your property
By default (Civil Code art. 1.725), a stable union follows partial communion of property (comunhão parcial de bens):
| Shared between partners | Stays each partner’s own |
|---|---|
| Assets acquired together during the union (regardless of whose name is on the title) | Assets each partner owned before the union began |
| Income and things bought with it during the union | Gifts and inheritance received during the union |
You can change this by signing a cohabitation agreement (contrato de convivência) — the stable-union equivalent of a prenup — choosing, for example, full separation of property so each partner keeps their own. One important limit: an agreement generally works going forward, so it is far stronger signed early than after assets and disputes have already accumulated.
União estável vs. marriage
For property and inheritance, the two are largely aligned — the same four marital property regimes are available to a stable union, and the default is the same. The differences are mostly about formation and proof: a marriage has a clear date and certificate, while a stable union can be uncertain at the edges (when did it start? was it “stable” yet?), which is precisely what gets litigated. Couples who want certainty often either register the union with a dated agreement or convert it into marriage.
Inheritance rights in a stable union
Since the Supreme Court’s 2017 ruling (Tema 809), a surviving partner in a stable union inherits on the same terms as a spouse — the old rule that treated partners worse was struck down. Combined with Brazil’s forced-heirship system, that makes the union a central part of any estate plan. See inheritance tax and how estates pass in Brazil and estate planning for families with assets in Brazil and abroad.
How Oliveira Lawyers can help
We handle the full lifecycle of a stable union for foreign and binational couples — and can do most of it remotely, under a power of attorney:
- Cohabitation agreement (contrato de convivência) & asset protection — choose a property regime that protects pre-owned assets, a business, or children from a prior relationship, and put it on paper before problems arise.
- Declare & register the union — a public deed of stable union (escritura pública), the document you will need for banking, health plans, residency, and estate matters.
- Convert a stable union into marriage — when you want the certainty of a marriage date and certificate.
- Recognize a foreign relationship as a união estável — give a foreign cohabitation, common-law marriage, or domestic partnership effect in Brazil.
- Dissolve a stable union & divide property (partilha) — consensual and extrajudicial where possible, or contested, including cross-border assets.
- Recognition & defense — establish a union (including post-mortem, so a surviving partner can inherit), or defend against a retroactive claim that a union existed in order to reach your assets.
- Succession planning for partners — wills and structuring that account for a partner’s inheritance rights, coordinated with your property regime.
Foreign & binational couples
A stable union can also be the basis for residency in Brazil and, later, a faster route to citizenship. If you and your partner own or plan to buy property here, settle the regime first — see buying property in Brazil as a couple. And if you prefer a formal marriage with a signed regime, a prenuptial agreement does the same protective job for a marriage that a cohabitation agreement does for a union.
Frequently asked questions
What is a união estável in Brazil?
A legally recognized stable union — a continuous, public relationship lived as a family. It needs no ceremony and no minimum duration, and can be registered at a notary or recognized later by a court.
How do we formalize a união estável on purpose?
By signing a public deed of stable union (escritura pública) before a notary, and registering it at the civil registry — ideally with a cohabitation agreement that fixes your start date and property regime.
Can someone claim a união estável if we never signed anything?
Yes. Because a stable union arises from facts, a court can recognize one that was public, continuous, and lasting and lived with the intent to form a family — even after a breakup or a death, with effects that reach back to when the relationship began.
What is the difference between união estável and namoro qualificado?
“Qualified dating” is a serious relationship, even one where the couple lives together, but without the present intent to form a family. A stable union requires that present family intent — it is the key line Brazilian courts draw.
Is a stable union the same as marriage?
For property and inheritance it is largely equivalent. The main differences are in how it is formed and proved: a marriage has a clear date and certificate, while a stable union can be uncertain at the edges.
Do partners split assets 50/50 in a stable union?
By default, yes — a stable union follows partial communion of property, so assets built during the union are shared, even if it was never registered. A cohabitation agreement can change this.
Do we have to register our stable union?
No. It can exist as a matter of fact. But registering it — ideally with a dated cohabitation agreement — gives you certainty and the document you need for banking, residency, and estate matters, and it is what makes your chosen regime binding on third parties.
How do we protect our assets in a stable union?
Sign a cohabitation agreement (contrato de convivência) choosing a regime such as full separation of property, and register it. It works best signed early, because it generally operates going forward.
Does my partner inherit in a stable union?
Yes. Since the Supreme Court’s 2017 decision, a surviving partner inherits on the same footing as a spouse.
How do we end a stable union?
By dissolving it and dividing property (partilha) — consensually and extrajudicially where possible, or through the courts if contested.
Can a foreign relationship be recognized as a união estável?
Often yes — a foreign cohabitation, common-law marriage, or domestic partnership can be given effect in Brazil, subject to the facts and to Brazilian public policy.
Does união estável apply to same-sex couples?
Yes, fully — recognized by the Brazilian Supreme Court in 2011, with the same property and inheritance rules.
General information only, not legal advice, and not a substitute for advice about your specific circumstances. Brazilian family-law rules and their application change; confirm the current position before you act.
Reviewed by Luciano Oliveira, Esq., LL.M. — admitted in Brazil, Texas, and California. Last reviewed July 2026.