The myth
Surveys repeatedly find that a large share of the public believes living together for long enough creates a "common-law marriage". In most countries it does not. Cohabiting couples are the fastest-growing family type across the English-speaking world — and the least protected.
Three models, and where the line falls
Broadly, three approaches coexist:
- No status at all. Cohabitation creates nothing: no share of property in your partner's name, no maintenance, no automatic inheritance, no pension rights in many schemes. Claims fall back on ordinary property law — proving a beneficial interest — which is slow, difficult and expensive.
- A limited redress scheme. After a qualifying period, or where there is a child, a financially dependent partner can ask a court for a financial award on separation, and sometimes on death. These schemes usually carry very short time limits, which is what defeats most claims.
- Near-equivalence with marriage. After a defined period, or with a child, the couple is treated substantially like a married couple for property division and maintenance.
Which model applies to you is the single most consequential fact on this page, and it changes at the border — and sometimes at a state or provincial line within the same country.
What it does not change
Parental status is unaffected: children have the same rights regardless of their parents' marital status. How an unmarried father acquires parental responsibility does vary, and it is worth confirming rather than assuming.
How to protect yourselves without marrying
- A cohabitation agreement setting out contributions, ownership shares and what happens on separation.
- A declaration of trust when buying property together, recording each party's share — especially where deposits are unequal.
- Wills on both sides: without one, your partner may inherit nothing (see inheritance and wills).
- Nominations on pensions and life insurance, which pass outside the estate.
- A registered partnership where one exists, which gives legal protection without marriage.
On separation
No procedure is needed — you simply separate. The difficulties arise over jointly owned property and unequal contributions, which is why keeping records of who paid what, and agreeing the position in advance, matters far more for unmarried couples than for married ones.
The law differs between countries
This topic falls under the same framework as partnerships and cohabitation, whose main page carries a detailed entry for each of the twenty countries covered.