A cohabitation agreement is a written contract between two people who live together without being married, setting out who owns what, how they share expenses, and what happens if they separate. It is the closest thing Singapore offers to a safety net for unmarried couples, and because there is no equivalent of the divorce court’s power to redistribute property, it does considerably more work than a prenuptial agreement does for a married couple.
It is a contract, not a family law document. That is the key to understanding both its strength and its limits. As a contract it is generally enforceable on ordinary contract principles. But it cannot create spousal rights, it cannot make you married, and it cannot remove a duty owed to a child.
What a cohabitation agreement actually is
Singapore does not recognise common-law marriage. Living together for years produces no shared property, no maintenance entitlement and no inheritance right. When the relationship ends, the questions are ordinary civil ones, such as who owns the flat and whose money is in the joint account, answered by evidence that couples rarely keep.
A cohabitation agreement replaces that missing evidence with a document written while you are on good terms. It records the intentions that would otherwise have to be reconstructed years later from bank statements and disputed recollection. That is its central value: not that it wins a court case, but that it usually prevents one.
Because it is a contract, the usual requirements apply: agreement between the parties, consideration, an intention to create legal relations, and capacity. Domestic arrangements are sometimes presumed not to be intended as legally binding, which is a good reason to say expressly on the face of the document that you intend it to be legally binding and to have it properly drafted and signed.
How enforceable is it?
Generally enforceable, subject to two things. First, the ordinary contract defences: a court will not enforce an agreement obtained by duress, undue influence or misrepresentation, or one where a party lacked capacity. Second, public policy: a term that offends public policy or attempts to oust the court’s jurisdiction over matters the court must decide will not be given effect.
Terms about property and money between two adults sit comfortably within what contract law enforces. Terms about children do not, for the reasons set out below. And the practical strength of the agreement depends heavily on the circumstances in which it was signed: full disclosure, independent advice, no last-minute pressure.
What to include
A well-drafted agreement is specific. Vague statements of good intention are worth little.
Property
- Who owns the home, in what shares, and whether those shares are fixed or vary with contributions.
- The deposit: who paid what, whether any part is repayable off the top on sale, and how CPF monies used are to be treated on a sale or transfer.
- The mortgage: who pays, in what proportions, and whether repayments adjust the shares.
- Renovation and improvements, which otherwise generally create no interest in the property at all.
- What happens on separation: sale, buyout, a first option for one partner, a valuation mechanism, and a deadline.
This should align with how you actually hold the title. If you hold as tenants in common with stated shares, the agreement should match; if the mismatch is deliberate, say why. The underlying choice is explained in the guide to joint tenancy versus tenancy in common, and the wider risks in the guide to property owned with an unmarried partner.
Money and possessions
- Household expenses: how rent, utilities, food, insurance and a helper’s wages are split.
- Joint accounts: who contributes what, what the balance is for, and how it is divided if you separate.
- Debts: that each of you remains responsible for your own, and how any joint borrowing is handled.
- Gifts: whether significant gifts between you are outright or conditional, which prevents a jewellery-and-watches argument later.
- Vehicles, furniture and valuables, particularly anything bought jointly.
- Pets. Not a joke provision. Pets are property in law, and disputes over them are common and genuinely distressing. Say who keeps the animal and who pays its costs.
Separation mechanics
- Notice, and who moves out or how you decide.
- Who pays the mortgage or rent in the interim, and for how long.
- A timetable for sale, refinancing or transfer.
- How disputes are resolved: mediation before litigation is a sensible default.
What it cannot do
Be clear about the limits, because agreements that overreach invite challenge to the whole document.
It cannot bind a court on children. Arrangements for custody, care and control and access are decided on the welfare of the child. Parents can record what they intend, and a court will be interested in that, but it is not bound by it and circumstances change.
It cannot remove the duty to maintain a child. That duty is owed to the child, not between the parents, and it cannot be contracted away. A clause saying neither parent will claim maintenance is unenforceable, and a court can make an order regardless of what was signed. Where parents are unmarried, the position is set out in the guide to maintenance for a child born outside marriage.
It cannot create spousal rights. No agreement makes you married, gives you a claim to matrimonial assets, or entitles you to maintenance as a partner.
It cannot override HDB or CPF rules. Eligibility, ownership and CPF refund requirements are set by those bodies and are not negotiable between you.
It is not a will. A cohabitation agreement does not govern what happens on death. An unmarried partner inherits nothing on intestacy, so you also need a will, and ideally a Lasting Power of Attorney so that each of you can act for the other if capacity is lost.
Why independent legal advice matters for both of you
The most common attack on an agreement of this kind is that one party did not really understand it, or signed under pressure. Separate lawyers, advising each partner, is the most effective answer to that argument. It also produces a better document, because two sets of eyes catch the ambiguities that cause disputes.
Alongside advice, three habits strengthen an agreement: full and honest disclosure of assets, income and debts by both partners; signing well before any pressure point rather than on the eve of a purchase; and a written review whenever something significant changes. If you want advice on your own situation, we can connect you with a licensed Singapore law practice.
How it compares with a prenup and a deed of separation
These three documents are often confused. They apply to different stages and carry different legal weight.
| Document | Applies when | Legal weight |
|---|---|---|
| Cohabitation agreement | Partners living together, not married | A contract, generally enforceable on ordinary contract principles; no family court power sits above it on property |
| Prenuptial agreement | Before a marriage | Considered by the Family Justice Courts and can carry real weight, but the court retains the final say on division of matrimonial assets |
| Deed of separation | Married couple separating, before or instead of divorce | A contract that the court will consider and often give effect to, subject to its overriding powers |
The paradox is worth noticing. A prenuptial agreement is subject to a court’s discretion to depart from it, so it guides an outcome rather than dictating it. A cohabitation agreement faces no such discretion, because no court has the power to redistribute property between unmarried partners in the first place, which arguably makes it the more decisive of the two.
A deed of separation is the married equivalent of the separation provisions in a cohabitation agreement, dealing with living apart, finances and children after a marriage has broken down.
Is it worth doing?
The case for it strengthens sharply in certain situations: where you are buying property together, where contributions are unequal, where one partner has given up work or income, where either of you has children from an earlier relationship, where one partner is foreign, or where one of you owns a business.
Set the cost against the alternative. A contested trust claim over a home in the civil courts costs many times what a drafted agreement costs, takes months or years, and may end with a judge deciding what you meant on evidence neither of you kept. The agreement is not the expensive option.
Treat it as one part of a set rather than a standalone fix. Together with a will, an LPA, correct title documentation and up-to-date CPF and insurance nominations, it covers most of what the absence of marriage leaves exposed; the full picture is set out in the overview of the legal rights of unmarried couples in Singapore.
