The law in England and Wales does not generally treat an unmarried couple as though they were married, regardless of how long they have lived together, and there is no legal status of “common law spouse” automatically creating rights to property, maintenance or pensions.
A cohabitation agreement can therefore give a couple valuable clarity about their financial arrangements, both during the relationship and if they later separate. However, signing an agreement is not the same as acquiring all the protections that come with marriage or civil partnership, and its effectiveness depends upon what it says, how it was prepared, and whether the arrangements were properly documented elsewhere. Understanding the advantages and limitations can help a couple decide whether an agreement is appropriate for them.
What is a cohabitation agreement?
A cohabitation agreement is a contract between two people who live together, or intend to do so, without marrying or entering into a civil partnership. It records how they will manage particular financial matters and what should happen to their money, property, and possessions if their relationship ends.
An agreement may be useful for a young couple buying their first property, but it is by no means limited to that situation. It can be particularly important where one partner already owns a home, where the couple are contributing unequal deposits, or where one person has significantly greater wealth. Older couples beginning a relationship after divorce or bereavement may wish to protect property intended for their children.
The agreement can also help couples whose finances are relatively modest; disputes do not arise only over expensive properties or investment portfolios. Former partners can spend considerable time and money arguing about responsibility for rent, household debts, furniture, vehicles, or a much-loved pet.
The main advantages of a cohabitation agreement
Financial arrangements that appear obvious while a relationship is happy can look very different after separation. One person may regard money paid towards the mortgage as a contribution to ordinary living expenses, while the other believes those payments are gradually giving them an interest in the property.
A properly prepared agreement could record whether the money was a gift, a loan, or a contribution intended to provide a beneficial interest in a property. Addressing those issues at the outset would not necessarily prevent every disagreement, but it would give both parties a much clearer starting point.
Certainty is also important where a couple buy a property together but contribute different amounts. For example, if one party provides a £90,000 deposit and the other contributes £10,000, they may not want the proceeds divided equally following a sale. Their agreement could state how the deposit contributions are to be recognised, how mortgage payments affect their shares, and whether any increase or loss in value will be divided in fixed proportions.
Property ownership should usually be supported by an appropriately drafted declaration of trust and accurate Land Registry documentation. The cohabitation agreement and declaration of trust need to work together; an inconsistency between them can create the uncertainty the couple were trying to avoid.
Another advantage is the protection of existing assets; for example, a person who owns savings, investments, a business or several properties may want it understood that their partner will not acquire an interest merely because they live together. Equally, the financially weaker partner may want protection if they are expected to make contributions to an asset held in the other person’s name.
The process of making an agreement can also uncover different expectations before they become serious problems. One partner may believe that all future income will be shared, while the other expects to retain complete financial independence. Discussing these assumptions may feel uncomfortable, but discovering them after a separation is usually considerably worse.
The potential disadvantages
Both partners should have separate legal advice, especially where property, substantial savings, business interests, or unequal bargaining positions are involved. There may also be fees for preparing a declaration of trust, changing the form of property ownership, or making new wills.
Those costs can appear unnecessary when a couple are optimistic about their future. However, they should be compared with the expense of a disputed property claim if the relationship fails. Even a relatively straightforward disagreement can require correspondence, mediation, valuations, and court proceedings.
The conversations themselves can be difficult; asking what will happen if the relationship fails may be interpreted as showing a lack of commitment. A partner who owns the home might worry that raising the subject will appear controlling, while the person moving in may fear being accused of pursuing the other’s property.
Agreements also require attention as circumstances change; a document prepared when two people first rent a flat may no longer be appropriate after they buy a house, have children or reorganise their careers. An agreement that is left untouched for many years may fail to address the assets and responsibilities that now matter most.
What a cohabitation agreement cannot reliably decide
A cohabitation agreement cannot recreate the entire financial regime available on divorce. An unmarried partner does not acquire a general right to claim spousal maintenance, a pension share or a redistribution of assets merely because the relationship was long or one person has greater needs.
The agreement cannot prevent the court from exercising its jurisdiction in relation to children. Parents may record their present intentions about where a child will live or how they will share care, but the child’s welfare will remain paramount if a future dispute reaches the family court.
The agreement is not a substitute for a will, and unmarried partners do not automatically inherit from one another under the intestacy rules. If they want to provide for each other following death, they should make or update their wills. In conjunction with this, they should also review pension nominations, life assurance policies, and how jointly owned property is held.
Are cohabitation agreements enforceable?
Enforceability of a cohabitation agreement depends upon ordinary contractual principles and the circumstances in which the agreement was made. It may become vulnerable to challenge if one partner was pressured into signing, misled about important facts, or denied the opportunity to obtain advice. Problems can also arise where significant assets or liabilities were concealed.
A drastic change in circumstances does not automatically cancel a contract, but it can expose shortcomings in its wording and may affect the remedies available.
What happens if a couple separates without an agreement?
Without an agreement, each person’s legal position depends largely upon property ownership, trust law, and any evidence of what they intended. The court does not conduct the broad fairness exercise that it would perform during divorce proceedings.
If a home is jointly owned, the starting point may be influenced by the way ownership was recorded when the property was purchased. A person seeking a different division may need to establish that the parties intended their beneficial shares to differ or that their intentions later changed. The court may examine financial contributions and the parties’ wider dealings, but there is no simple promise that the outcome will reflect what either person now considers fair.
Where the home is owned by one partner, the other may need to establish a beneficial interest through principles such as a common intention constructive trust or proprietary estoppel. Paying bills, caring for children, or living in the property for many years will not necessarily create an ownership share on its own.
This can leave a separating partner in a difficult position. They may have organised their working life around the family but possess no automatic claim for personal maintenance or a share of the other person’s pension. Claims relating to children may sometimes be available under Schedule 1 to the Children Act 1989, but those claims are made for the child’s benefit rather than to compensate a former partner for the economic effects of the relationship.
A cohabitation agreement cannot remove every risk or predict every event, but what it can do is replace uncertain memories and unspoken assumptions with a considered record of what both people intended.