Coexistence Relationships of Mutual Aid
In recent years, family and cohabitation structures have evolved beyond traditional models. Catalonia, at the forefront in the field of Civil Law, has legally recognised a figure that responds to these new realities: cohabitation relationships of mutual assistance.
What are cohabitation relationships of mutual assistance?
The cohabitation relationship of mutual assistance is a legal figure unique and exclusive to Catalan civil law, specifically regulated in Book II of the Civil Code of Catalonia (CCCat). This modality legally recognises the existence of a stable cohabitation between two or more adults who are neither united by marriage nor by a stable partnership, but who share a habitual residence and cooperate in an altruistic manner, whether by contributing to common expenses, undertaking domestic tasks, or both simultaneously.
This type of relationship is configured as a flexible legal alternative to the traditional family model, especially designed to provide coverage for situations of mutual support among elderly people, consolidated friendships, or collateral family relationships (such as between siblings or nephews), in which there is a will for permanence and reciprocal collaboration.
For this cohabitation to produce full legal effects, it must be based on the firm intention of permanence and mutual assistance, as required by article 240-1 of the Civil Code of Catalonia.
Who can establish a cohabitation relationship of mutual support in Catalonia?
Subjective requirements (art. 240-2 CCCat)
The law clearly establishes who can and who cannot constitute this type of cohabitation relationship:
People who can formalise it:
- Adults who maintain a collateral kinship relationship (for example, siblings, cousins or nieces).
- People without a family bond, united by a lasting friendship or companionship relationship.
People who cannot formalise it:
- Spouses between themselves.
- Stable couples, according to the legal definition of the CCCat.
- Relatives in a direct line, such as parents and children, grandparents and grandchildren.
Find out about the rights corresponding to marriages and civil partnerships here:
Limit of cohabiting persons
In cases where there is no kinship between the members, the maximum number of cohabitants allowed by law is four people. This limitation aims to preserve the personal, stable, and supportive nature of this type of cohabitation, preventing it from being distorted into a mere group cohabitation without emotional ties or mutual commitment.
Objective requirements to establish a cohabitation relationship of mutual support
In addition to meeting the personal requirements, the mutual aid cohabitation relationship requires a series of objective conditions that must occur simultaneously for it to have legal validity according to the Civil Code of Catalonia. These requirements are essential to differentiate this figure from other unregulated forms of cohabitation.
1. Household unit in the same usual residence
It is essential that the people involved share a common residence that constitutes their usual and permanent domicile. Occasional coexistence or simple temporary cohabitation is not accepted, as the rule requires a clear intention to establish a life together.
2. Selfless contribution to domestic life
Co-habitants must collaborate free of charge and without financial compensation in maintaining the household. This collaboration can take the form of:
- Contributions to common expenses (rent, utilities, food, etc.).
- Carrying out domestic chores.
- Or a combination of both forms of contribution.
This element distinguishes the cohabitation relationship from any contractual agreement or disguised employment relationship.
3. Existence of a will to remain and mutual assistance
There must be an explicit will to remain in cohabitation, as well as a real commitment to mutual assistance among the people who make it up. This will cannot be merely implicit or circumstantial; it must be projected over time and aimed at creating a stable environment of mutual support.
Exclusion of temporary cohabitations
Explicitly excluded from this legal figure are those situations of merely temporary or non-lasting commitment cohabitation, such as those that occur between flatmates, students or people who share accommodation for economic reasons, without a clear intention of permanence or mutual support.
How is a cohabitation relationship of mutual support formalised?
Formal requirements and legal incorporation procedures
The Código Civil de Cataluña offers two mechanisms to provide legal validity to cohabitation relationships of mutual support. Both allow cohabitation to have full legal effects, although they differ in terms of immediacy and the way of proving the existence of the relationship.
1. By public deed before a Notary
The most direct and secure way to formalise this relationship is the granting of a notarial public deed. This instrument allows for an immediate and reliable record of the will of the cohabitants, the fulfilment of legal requirements, and any agreements they may have established. From the moment it is signed, the relationship is legally constituted.
This option presents important advantages:
- Legal certainty and indisputable documentary evidence.
- Ease of registration in administrative records if necessary.
- Possibility of including specific mutual assistance care agreements (see below).
Learn more about deeds:
2. Due to continuous cohabitation for at least two years
It is also possible for the relationship to be constituted tacitly, provided that an uninterrupted cohabitation of at least two years is proven. For this, a notarial certificate of notoriety is not required, and evidence such as the following is sufficient:
- Joint registration at the same address.
- Documentation proving shared expenses or prolonged cohabitation.
This alternative is useful when a deed has not been granted, but it may pose problems when proving the existence of the relationship to third parties or for administrative or tax purposes.
Mutual Aid Care Agreements: private autonomy and legal limits
One of the most relevant aspects of this legal figure is that the Civil Code of Catalonia recognises the full freedom of care agreements between the members of the cohabitation relationship. That is, the cohabitants can establish personalised cohabitation agreements that regulate this situation and the legal consequences arising from it.
Possible contents of coexistence care agreements
Among the cohabitation agreements that can be formalised, the following stand out:
- The distribution of common expenses and the division of household chores.
- The possibility that one of the cohabitants exclusively assumes certain economic or personal burdens.
- The regulation of the effects in the event of a possible termination of the cohabitation, including aspects such as the allocation of the home, compensation, or division of jointly acquired assets.
Limits of cohabitation agreements
For these care agreements to be fully valid and enforceable, they must meet a fundamental condition: they cannot harm third parties. This implies, for example, that clauses that infringe the rights of creditors, forced heirs or other legitimate beneficiaries cannot be agreed upon.
In any case, formalising these mutual aid care agreements in a public deed provides clarity, security and evidential strength, and can be especially useful in case of conflicts or termination of cohabitation.
Termination of mutual support cohabitation relationships in Catalonia
Like any legal entity, the mutual assistance cohabitation relationship has a duration limited to the will of the cohabitants or to certain circumstances provided for by law. The Civil Code of Catalonia, in its article 240-5, regulates the causes of termination of this cohabitation, as well as the legal effects arising from its dissolution.
Legal causes of termination (art. 240-5 CCCat)
The cohabitation relationship can end for the following reasons:
- Mutual agreement between all cohabitants.
- Unilateral decision by one of them, which is enough to end the cohabitation.
- Death of any of the cohabitants.
- Marriage constitution or formalisation of a stable partnership by any of the members.
Causes expressly agreed by the parties in the formalised prior agreements.
Continuity in multipersonal relationships
In cases where the relationship is formed by more than two people, the termination does not necessarily imply total dissolution. If one of the cohabitants leaves the relationship, it can continue among the remaining ones, provided that cohabitation, mutual support, and the other legal requirements are maintained.
Legal consequences after termination
The dissolution of a cohabitation relationship entails a series of automatic legal effects, especially relevant in the area of use of the common home, the powers of attorney granted, and the mutual assistance agreements agreed upon during cohabitation.
Automatic revocation of powers
According to the Civil Code of Catalonia, the termination of the relationship entails the revocation of all powers granted between the cohabitants. This measure aims to prevent unwanted representation situations once the cohabitation has ended, ensuring the legal security of both parties.
Right of use of the dwelling (art. 240-6 CCCat)
The fate of the shared home after the termination depends on its ownership and the regime under which it was held:
a) If the home is the exclusive property of one of the cohabitants:
The others must leave the property within a maximum period of three months, unless otherwise agreed in the cohabitation agreements.
b) If the cohabiting owner dies:
The remaining cohabitants may remain in the home for a period of up to six months, provided there is no agreement to the contrary or a testamentary provision indicating otherwise.
c) If the home was rented and the contract holder was one of the cohabitants:
The others may subrogate the lease contract, maintaining the use of the home for one year from the termination (or until the contract ends if earlier). To do so, they must notify the landlord within a maximum period of three months from the termination of the cohabitation.
Frequently asked questions about mutual support cohabitation relationships in Catalonia
The cohabitation relationship of mutual support does not presuppose the existence of an exclusive sentimental or affective bond, nor does it generate the legal rights inherent to marriage or a registered stable partnership. Its basis is solidarity in cohabitation and mutual support, without a conjugal character.
Yes. The Civil Code of Catalonia allows the establishment of a cohabitation relationship between up to four people, provided that there is no direct lineal kinship (such as parents and children) nor couple relationships among the cohabitants. This option is especially designed for groups of friends, siblings or collateral relatives who share housing and care.
It is not strictly necessary, but it is highly recommended. The relationship can be legally proven if a continuous cohabitation of at least two years is demonstrated, through valid means of proof. However, without a public deed, important tax benefits are lost and it becomes difficult to prove before third parties or administrations.
Among the valid means to prove cohabitation, the following are included:
- Joint registration at the same address.
- Shared supply contracts (electricity, water, internet).
- Testimonies from third parties or sworn statements.
- Notarial deeds that document the cohabitation or the established relationship.
Yes. The public deed must faithfully reflect the composition of the cohabiting group. If a new person joins or one of the cohabitants leaves the relationship, it will be necessary to grant a new deed that reflects the new legal reality.
From a tax perspective, yes: if the legal requirements are met, the cohabitant can benefit from the same treatment as a child or descendant for the purposes of the Inheritance Tax. However, from a civil or succession perspective, they are not automatically recognised as an heir, unless they have been expressly designated by will.
JLA Notaries, Notary for cohabitation agreements with flatmates
Mutual support cohabitation relationships represent a modern and effective legal response to the new forms of cohabitation in our society.
If you are considering establishing a mutual support cohabitation relationship, we invite you to seek the expert advice of our Notaries in Barcelona. We will help you formalise your relationship with all legal guarantees, optimise its tax treatment, and securely plan for the future.
Consult with us. You can do so through our contact form, by sending an email to bcn@jlanotarios.com, or by writing to us on WhatsApp at 607 50 01 71.
