Cohabitation Agreements vs Marriage Contracts In South Africa

A cohabitation agreement in South Africa is a private contract between unmarried partners that records how property, finances and contributions will be handled during the relationship and on separation. A marriage contract (typically called an antenuptial contract, or ANC) is the document that sets the matrimonial property regime for a couple who intend to marry — community of property, out of community of property, or out of community of property with the accrual system — and is executed under the Matrimonial Property Act 88 of 1984 before the wedding and notarised for registration. The two documents differ in legal foundation (contract vs statute), in automatic effects on inheritance and pension-fund nominations, and in consequences on relationship breakdown: marriage triggers the matrimonial property regime and the Intestate Succession Act’s spousal inheritance rules; a cohabitation agreement only does what its clauses say.

What a Cohabitation Agreement Is in South Africa

A cohabitation agreement (sometimes called a living together agreement) is a private contract between two unmarried people who live together in a life-partnership arrangement. It is governed by common-law contract principles — there is no Family Law Act or Cohabitation Act in South Africa that automatically recognises unmarried partnerships, so the document’s legal force comes from contract law rather than from any family-law statute.

In practice, a cohabitation agreement typically records:

• how joint property (such as a home bought together) is owned and registered;
• how financial contributions and household expenses are shared during the relationship;
• what happens to property and assets on separation, including the division of any jointly acquired items;
• any financial-support obligation that is intended to continue after the partners separate.

The agreement does not create a legal marriage and gives the partners no automatic spousal status — they remain legally single in the eyes of the law, and the document does not convert into any form of civil marriage without a fresh, separate legal step (such as solemnising a marriage under the Marriage Act 25 of 1961 or the Civil Union Act 17 of 2006).

What a Marriage Contract (Antenuptial Contract) Is in South Africa

The standard South African legal term for this document is antenuptial contract (ANC) — “antenuptial” means executed before the marriage. It is governed by the Matrimonial Property Act 88 of 1984, read together with the Marriage Act 25 of 1961.

An ANC sets the matrimonial property regime for the intended marriage. The Act recognises three regimes:

• Community of property — a single joint estate from the date of marriage, split 50/50 on divorce.
• Out of community of property — each spouse keeps their own estate, with no accrual sharing on divorce.
• Out of community of property with the accrual system — separate estates during the marriage, with the spouse whose estate grew less claiming 50% of the difference between the two accrual values on divorce.

Couples who marry without an ANC fall into the community-of-property regime by default — this is one of the most consequential decisions any South African couple makes, often without realising it. A postnuptial contract (executed after the marriage) is not a free drafting exercise: it requires a joint application to the High Court under section 21 of the Matrimonial Property Act, and the court only grants leave in defined circumstances.

Once properly executed and notarised, the ANC binds the spouses. For full third-party effect — so that creditors, the Deeds Office and other outside parties are bound by the regime — the contract must be lodged at the Deeds Office against the parties’ credit records within three months of the date of marriage.

Side-by-Side Comparison

The table below sets out the key differences between the two instruments across the same dimensions, so couples can compare them directly rather than reading two separate single-instrument explanations.

Dimension	Cohabitation Agreement	Marriage Contract (ANC)
Legal foundation	Common-law contract principles	Matrimonial Property Act 88 of 1984 read with the Marriage Act 25 of 1961
Parties’ legal status	Remains legally unmarried	Married once the marriage is solemnised
Formalities	Written contract, signed by both parties; usually no notarial execution or Deeds Office registration required	Notarised execution before a notary; certain regimes require Deeds Office registration to bind third parties
Property during the relationship	Whatever the contract says (typically rules for shared vs separate assets and contributions)	Set by the chosen regime — community of property creates a joint estate; out of community of property (with or without accrual) keeps estates separate, subject to the accrual calculation at divorce
On separation	Contract terms apply; no automatic spousal maintenance, no automatic equal split, and no automatic duty of support under common law	In community of property: shared estate is split 50/50. Out of community with accrual: smaller estate is “caught up” to 50% of the difference between the two accrual values. Out of community without accrual: each keeps their own estate, subject to any contractual or donation claims
Inheritance from partner (intestate)	No automatic spousal inheritance — partner inherits only if named in the will	Spouse inherits under the Intestate Succession Act 81 of 1987 (share depends on whether descendants survive)
Duty of support between partners	Only what the contract provides; no automatic common-law support duty between unmarried cohabitants	Automatic common-law duty of support; enforceable under the Divorce Act 70 of 1979 if the marriage breaks down
Retirement fund / insurance nominations	Partner nominations do not attract spousal protection by default under the Pension Funds Act 24 of 1956	Spouse nominations receive the section 37C protection under the Pension Funds Act
Typical cost	Generally lower — drafting a contract for unmarried partners typically costs less than notarial execution of an ANC	Higher — notary drafting and execution fees, plus Deeds Office filing costs where the regime is registered against credit records
Estate planning interaction	Does not amend the Intestate Succession Act; partners who want to inherit must be named in a valid will	Does not amend the Intestate Succession Act either, but spouses acquire standing to claim reasonable provision from the estate under the Maintenance of Surviving Spouses Act 27 of 1990

How the Two Affect Property on Separation

Property division on separation is the single most consequential difference between the two instruments.

• Cohabitation: the agreement controls. In the absence of agreement, common-law ownership rules apply — each partner keeps what is registered in their name, and joint assets are divided according to contribution or co-ownership.
• Marriage in community of property: one joint estate accrues from the date of marriage to the date of separation; on divorce the joint estate is split 50/50.
• Marriage out of community of property with accrual: at divorce the spouse whose estate grew less claims 50% of the difference between the two accrual values. The contract must explicitly include the accrual clause — silence in the ANC means no accrual.
• Marriage out of community of property without accrual: each spouse keeps their own estate at divorce, subject to any contractual or donation claims that survive the marriage.

For couples with assets, businesses or expected inheritances on either side, the choice between the three matrimonial regimes (and the choice between marriage and cohabitation) drives most of the financial outcome on separation.

Inheritance and Estate Planning Implications

Inheritance is where the gap between the two instruments is widest in practice.

A cohabitation partner does not inherit from the other automatically — to inherit on intestacy, the partner must be named in the deceased’s will. Without a will, an unmarried cohabitant has no inheritance claim under the Intestate Succession Act 81 of 1987. A spouse, by contrast, does inherit automatically on intestacy, with the share depending on whether descendants, parents or other heirs also survive.

Marriage does not invalidate an existing will, but it does give the surviving spouse standing to claim reasonable provision from the estate under the Maintenance of Surviving Spouses Act 27 of 1990 — cohabitants have no equivalent standing. For couples with children from previous relationships, an ANC combined with a properly drafted will is typically the most reliable way to ensure both the surviving spouse and the children are provided for in the proportions the parties intended.

When a Cohabitation Agreement Is the Right Choice

A cohabitation agreement is generally the right instrument where:

• the couple is not ready or willing to enter a marriage with its full automatic legal consequences;
• one or both partners have religious, cultural or personal reasons for not marrying;
• the primary goal is to record financial and property arrangements during the relationship and on separation, with no expectation of automatic spousal legal status;
• the couple wants a lower-cost, faster legal instrument than a notarial ANC and does not need the protections tied to civil-marriage status;
• both partners are clear that no automatic intestate inheritance, duty of support, or spousal-maintenance claim will arise on relationship breakdown.

When a Marriage Contract (ANC) Is the Right Choice

An ANC — and the marriage it precedes — is generally the right instrument where:

• the couple intends to marry and wants to control their matrimonial property regime — particularly where one or both partners have existing assets, businesses or expected inheritances they want to keep separate;
• the couple wants the automatic protections of marriage — duty of support, intestate inheritance, pension-fund nominations, spousal maintenance on divorce;
• the couple wants to elect the accrual system (which the ANC must specify expressly) so the spouse who grows their estate less receives a share of the growth on divorce;
• one or both partners have children from a previous relationship and need an estate plan built on a clearly defined matrimonial regime.

Can You Have Both, or Switch from One to the Other?

Yes — a couple can start as cohabitants with a cohabitation agreement and then marry later with an ANC. The cohabitation agreement remains a valid contract (or can be terminated by mutual agreement), and the marriage contract then governs the matrimonial-property regime from the date of marriage.

Two important limits apply. First, a cohabitation agreement cannot convert into an ANC, and an ANC cannot operate against unmarried parties — they are separate documents anchored in different legal frameworks. Second, couples who marry without an ANC are in community of property by default, which is one of the most consequential decisions South African couples make — often without realising that it means a single joint estate and a 50/50 split on divorce.

Practical Considerations: Cost, Timeline, What to Bring

The three practical variables — cost, lead time and disclosure — apply to both instruments, but they weigh differently.

Variable	Cohabitation Agreement	Antenuptial Contract (ANC)
Cost	Typically cheaper because notarial execution and Deeds Office registration are usually not required	Higher — notary fees, drafting time by an attorney, and Deeds Office filing fees where the regime is registered against credit records. The cost difference narrows for complex files (business interests, prior marriages, immovable property in multiple jurisdictions)
Timeline	Can usually be finalised within a few weeks once both parties have exchanged full financial disclosure	Typically drafted well in advance of the wedding date and notarised shortly before, leaving sufficient lead time for both parties to take independent legal advice on its terms
What to bring to a first consultation	Identity documents, full disclosure of existing assets and liabilities (the financial schedules each party will sign), any prior marriage or divorce orders, any existing or draft will, the names of any children from previous relationships	Same as cohabitation, plus the planned marriage date so the contract can be notarised and lodged at the Deeds Office within the three-month window

If you and your partner are weighing a cohabitation agreement against getting married with an antenuptial contract, Burger Huyser Attorneys‘ Family Law team can talk you through what each option actually does in your circumstances. The firm handles both instruments from its Linden/Randburg head office (49 First Avenue, Linden, Randburg, 011 888 0246) and across its Gauteng branches in Centurion, Pretoria-Menlyn, Sandton, Roodepoort, Bedfordview, Alberton and Midrand. The first conversation is a one-on-one consultation covering both parties’ assets, any prior marriages, children from previous relationships, and the inheritance and pension implications — there is no obligation to instruct, and the firm will give an honest cost conversation up front. Burger Huyser carries a 4.8/5 average across 250+ Google reviews (Trustindex verified “Top Rated Law Firm in South Africa”) and has been recognised at the MEA African Excellence Awards and Lawyers Monthly Legal Awards for family-law work.

Frequently Asked Questions

Is a cohabitation agreement legally binding in South Africa?

Yes — a cohabitation agreement is a private contract and is binding on the parties to the extent its terms are lawful, certain, and consistent with public policy. It does not, however, give cohabitants any of the automatic rights that flow from a marriage (such as intestate inheritance, a duty of support, or pension-fund spousal protection) — those rights only arise from a valid civil marriage.

Can we marry without an antenuptial contract?

Yes — but if there is no ANC signed and notarised before the wedding, the marriage is in community of property by default, which means a single joint estate from the date of marriage and a 50/50 split of that estate on divorce. Most couples who want to keep their estates separate sign an ANC specifically to avoid this default.

How much does an antenuptial contract cost in South Africa?

Costs vary depending on the complexity of the parties’ assets and the fees charged by the notary and the drafting attorney. A straightforward ANC for two employed parties with no business interests is generally more expensive than a basic cohabitation agreement. An ANC’s fee typically includes notary execution and, where required, Deeds Office registration against the parties’ credit records.

What happens if we separate without either agreement?

Without either agreement, the couple’s property is divided according to common-law ownership rules — each partner keeps what is in their name, and any jointly owned assets are dealt with according to contribution or co-ownership principles. There is no automatic equal split, no automatic maintenance obligation between the partners, and no automatic inheritance on death.

Can same-sex couples marry and sign an ANC in South Africa?

Yes — same-sex marriage has been lawful in South Africa since the Civil Union Act 17 of 2006, and same-sex couples use the same antenuptial-contract process and can choose the same matrimonial-property regimes (including out of community of property with accrual) as opposite-sex couples. Cohabitation agreements are equally available to same-sex couples who do not wish to marry.

Does signing a cohabitation agreement mean we are “life partners” in law?

No — South African law does not create a registered legal status for unmarried cohabitation. Even a signed cohabitation agreement does not give the partners the legal status of “spouse” or “life partner” in the sense used by statutes such as the Intestate Succession Act or the Pension Funds Act. If one partner wants those statutory protections, the marriage option (with or without an ANC) is the route that delivers them.