The Common Law Marriage That Does Not Exist in Many Places

There is a short answer about the legal position of unmarried couples and a useful one, and they are not the same. What follows is the useful one.

A widespread and costly misunderstanding

Surveys in several countries have repeatedly found that large numbers of cohabiting people believe long cohabitation creates marriage-like rights. In many of those same jurisdictions, no such status exists, and the belief is discovered to be wrong at the worst possible moment. The consequences arise on separation and on death, both of which are situations where the household is least able to absorb a surprise.

Some jurisdictions do provide rights to cohabitants after a defined period or where children are involved, and those regimes differ enormously. The only reliable approach is to check the position in your own jurisdiction rather than to rely on a widely repeated assumption.

Property on separation

Where no specific cohabitation regime exists, property questions are usually decided by ordinary rules of ownership and trusts. That means the name on the title and the financial contributions made carry far more weight than the length of the relationship. Claims based on contributions or on agreements between the parties exist in many systems and are typically difficult and expensive to establish.

Non-financial contributions such as childcare and home-making are recognised much less readily than in most divorce regimes. The practical result is that a partner who did not contribute financially may leave a long relationship with very little.

Death and inheritance

Default succession rules in many systems exclude unmarried partners entirely, whatever the length of the relationship. Without a will, a surviving partner may find the estate passing to relatives they barely know while they face losing their home. Some systems allow dependants to apply for provision, and that route is uncertain, slow and stressful compared with a simple will.

Pension schemes vary in whether they recognise unmarried partners, and nominations are frequently the deciding factor. Making wills and updating nominations is the single most effective step an unmarried couple can take.

Children

Rights and responsibilities relating to children are generally treated separately from the status of the parents' relationship. Whether an unmarried father or a non-birth parent automatically acquires parental responsibility differs substantially between systems. Registration on a birth certificate has different effects in different countries, which is a detail worth confirming locally.

Child maintenance obligations generally apply regardless of whether the parents were married to each other.

Where parental status is uncertain, taking advice early is far better than discovering the position during a crisis.

What documentation achieves

A cohabitation agreement recording ownership shares, contributions and intentions is enforceable in many systems and clarifying in all of them. A declaration of trust recording the beneficial shares in a jointly purchased property is a particularly valuable document.

Where a dispute goes formal, keeping records of who paid what towards a property is the evidence any later claim would depend on. Wills, pension nominations and life insurance arrangements complete the practical protection for most couples. None of this is expensive relative to the cost of resolving the same questions through litigation later.

Limitation periods are short and unforgiving, which is why proper advice is worth taking early rather than after reading around.

Considering the alternatives

Some jurisdictions offer registered partnership or civil union status that provides many of the protections of marriage. Whether such a status exists, who may enter it and what it provides are entirely local questions. Couples who deliberately choose not to marry can still take almost all the practical protections through documentation.

For most everyday situations, the choice is a personal one, and the point is simply that the legal consequences should be understood rather than assumed. For couples with property, children or significant disparity in income, professional advice is proportionate.

The takeaway

Check what your jurisdiction actually provides, and document what you have agreed. General explanation only, and not legal advice.

Most disputes are settled by whoever kept the better record.