What Is Co-Ownership of Property and How Does It Work in Australia?
Co-ownership of property — buying with a partner, family member, friend or business associate — is increasingly common in Australia as prices rise and more buyers pool resources to enter the market. Understanding how co-ownership works legally, the two main structures available, and the exit strategies you need to plan for before you buy is essential to protecting your interests.
What Are the Two Ways to Co-Own Property in Australia?
There are two legal structures for co-ownership of real property in Australia: joint tenancy and tenants in common. The choice has significant legal, tax and estate planning implications.
| Feature | Joint Tenancy | Tenants in Common |
|---|---|---|
| Ownership shares | Equal shares (50/50 if two owners) | Any proportion (e.g. 60/40, 70/30) |
| On death | Automatically passes to surviving owner(s) — right of survivorship | Passes according to the deceased’s will or intestacy rules |
| Can sell your share independently? | No — must convert to tenants in common first | Yes — subject to co-owner agreement |
| Common for | Married couples and de facto partners | Business partners, friends, siblings, investors |
| Estate planning flexibility | Limited | High |
What Is a Co-Ownership Agreement?
A co-ownership agreement (also called a tenancy in common agreement or co-ownership deed) is a legal document that sets out the rights, obligations and exit arrangements between co-owners. Key clauses typically cover: ownership percentages, contribution to mortgage and outgoings, decision-making rights, what happens if one party wants to sell, dispute resolution, and what happens on death or relationship breakdown. A co-ownership agreement is not legally required but is strongly recommended — especially for friends, siblings and business partners buying together.
What Happens If One Co-Owner Wants to Sell?
This is the most common source of co-ownership disputes. Under tenants in common, any co-owner can apply to the Supreme Court for an order of partition or sale (called a statutory right of partition) if the parties cannot agree. This process can be expensive and time-consuming. A well-drafted co-ownership agreement prevents this by setting out a pre-agreed process — typically a right of first refusal for the remaining co-owner to buy out the departing co-owner at an independently valued price.
What Are the Stamp Duty and Tax Implications of Co-Ownership?
Each co-owner pays stamp duty on their share of the purchase price. Each co-owner is assessed for capital gains tax on their proportionate share of any gain on sale. If the property is an investment, rental income and deductions are split according to ownership percentages. First home buyer exemptions apply individually — if one co-owner is not a first home buyer, that co-owner may be liable for full stamp duty on their share even if the other co-owner qualifies for an exemption.
GeeVee Verdict: Always Have a Co-Ownership Agreement
Co-ownership can be a powerful strategy for entering the market or building a portfolio. The risks are manageable if you structure it correctly with tenants in common (not joint tenancy) and a written co-ownership agreement drafted by a property solicitor before you exchange contracts. The legal cost of a co-ownership agreement ($1,000 to $3,000) is trivial compared to the cost of a co-ownership dispute.
Frequently Asked Questions
Can I co-own a property with someone I am not in a relationship with?
Yes. You can co-own property with anyone — siblings, friends, business partners, parents. Tenants in common is the usual structure for non-couples. A co-ownership agreement is essential in these arrangements.
Can co-owners have different loan arrangements?
It depends on the lender. Some lenders allow split loans (each co-owner borrows their share separately), which simplifies tax deductions for investment properties. Others require a joint loan. Speak with a mortgage broker who has experience with co-ownership purchases.
What happens to a co-owned property if the co-owners separate or divorce?
For married and de facto couples, the Family Court can make orders about the property in family law proceedings. For non-couple co-owners, the co-ownership agreement governs — or the Supreme Court partition process applies if there is no agreement. Always get legal advice specific to your situation.
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