União Estável in Brazil: Stable-Union Rights, Property & Asset Protection

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 fixed statutory minimum duration. Stability and a present family relationship must still be proved.

For property, the usual default is partial communion of property: qualifying assets acquired for value during the union are generally shared equally, subject to statutory exclusions — even if the union was never registered. A valid written agreement or a mandatory regime can change the analysis.

Since a 2017 Supreme Court decision, the surviving partner falls under the same statutory succession order as a spouse. The actual entitlement depends on the property regime, assets, other heirs and applicable law.

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.

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.

Reviewed by Luciano Oliveira, LL.M., attorney admitted in Brazil, Texas, and California. Last reviewed: July 2026. Content updated: October 30, 2026.

What is a união estável?

A stable union is recognized when a couple maintains 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.”

Living under the same roof is neither required nor sufficient. 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 routes: documenting the union or proving it later

Here is the idea that surprises foreign couples most. Recognition of an existing stable union is declaratory — 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. The routes below concern how the relationship is documented or proved, not two different legal kinds of union.

1. Documenting the relationship proactively

This is the deliberate path. A Brazilian stable union is not automatically interchangeable with a US civil union or domestic partnership; recognition depends on the relevant jurisdiction.

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 records the claimed start date and supporting evidence. A declared date is not conclusive against disputed facts or third-party rights.
• It lets you choose your property regime through a cohabitation agreement (contrato de convivência). Without that written agreement, the usual default partial-communion regime applies. With it, you can, where legally permitted, choose conventional separation. Existing shared property, debts and inheritance rights need separate analysis.

A valid private written agreement can bind the partners without a public deed. Publicity and appropriate registration matter for effects against third parties, particularly creditors. Late registration does not defeat previously established creditor rights, and registration is not a blanket shield against heirs or other claims.

A stable union is not automatically marriage: to become married you formally convert it (conversão em casamento). Confirm the regime and required instruments before conversion; it does not erase property rights already acquired during the union.

2. Recognition after a dispute or death

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 legal requirements were actually met, 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 — assessed together. Children or a joint address alone do not establish a stable union.

One important distinction is whether the relationship was “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 in fact or legally generally 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 the qualifying shared property, and the surviving partner’s succession rights follow the statutory order discussed below.

This is why the proactive route matters even when you feel settled: a dated cohabitation agreement helps define property arrangements prospectively. It cannot retroactively erase an accrued property share or guarantee that no claim will be brought. Labels alone will not save you (a court follows the facts over a “dating contract”), and a properly signed and registered agreement must still comply with law and protect existing third-party rights.

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):

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 for future acquisitions.

One important limit: an agreement generally works going forward, so it is far stronger signed early than after assets and disputes have already accumulated.

Mandatory separation requires separate attention. For a union involving a person over 70, STF Tema 1236 permits an express choice by public deed; changes to an existing union operate prospectively. Where mandatory separation applies, sharing acquisitions can depend on proof of common effort, including nonfinancial contributions.

União estável vs. marriage

For property and the statutory succession order, the two are substantially aligned. Subject to mandatory rules, the four marital property regimes can inform a stable-union agreement, and the ordinary default is the same.

Important differences concern 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), Civil Code article 1,829 supplies the same succession order for spouses and stable-union partners. This does not mean that every surviving partner receives the same percentage or that registration guarantees an inheritance.

First distinguish meação from inheritance: the survivor’s existing ownership share is separated before the deceased’s estate is distributed. The regime, separate and shared assets, descendants or ascendants, wills and applicable cross-border law affect the result. Choosing conventional separation does not by itself waive inheritance.

The STF ruling addressed the succession order, but subsequent STJ case law has also recognized a surviving partner as a compulsory heir, including REsp 1,982,343/SC in 2025. Do not assume that a will or separation-of-property agreement can exclude the partner. The protected share and any lawful exclusion require case-specific analysis.

For estate administration, see Inheritance & Probate. For costs, see the inheritance tax and fees guide; for advance arrangements, see 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 — with remote coordination where the procedure permits. Personal declarations, identity checks and specific powers may still be required:

• Cohabitation agreement (contrato de convivência) & asset protection — assess a property regime in light of pre-owned assets, a business, and 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), evidence that may support banking, health-plan, residency, and estate matters. Each recipient sets applicable proof requirements.
• 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 — assess whether and how a foreign cohabitation, common-law marriage, or domestic partnership can have 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.

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Foreign & binational couples

A qualifying stable union with an eligible sponsor can support an application for residency in Brazil and a continuing union with a Brazilian citizen may reduce the residence period for citizenship. Neither status is automatic: immigration and naturalization have separate evidence, residence and other requirements.

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 serves the corresponding property-planning role for marriage, with different formalities. Foreign documents may require authentication, translation and registration; a foreign label alone does not settle Brazilian recognition.

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 or fixed statutory minimum duration, but must be stable and lived as a family, 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 records the supported start date and lawful property arrangements. A disputed date can still require proof.

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 legal requirements were met.

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?

Under the usual partial-communion default, qualifying shared property is generally divided equally. Individually inherited or gifted property and other statutory exclusions are not automatically shared. A valid agreement or mandatory regime can change the analysis; registration is not required for the union to exist.

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 — improves evidence and publicity for banking, residency, and estate matters. Registration does not conclusively prove a disputed start date or defeat pre-existing creditor rights.

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?

The same statutory succession order applies, but the entitlement and share depend on the regime, estate assets, other heirs and applicable law. Meação is the survivor’s existing ownership share, not an inheritance.

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.