Buying Property With Family or Friends: Co-Ownership Structures

What If You and Your Best Friend Buy a House Together and Then Life Happens?

Co-buying property with family or friends has become an increasingly common way to get into the market, splitting a deposit and repayments makes an otherwise unreachable purchase possible for two or more people. What often gets skipped in the excitement of getting in is the unglamorous but genuinely critical part: how ownership is actually structured, what happens with uneven contributions, and what the exit plan looks like if one party's circumstances change, a relationship ends, a job relocates, or someone simply wants out years before the others do. The right of survivorship under joint tenancy, covered below, interacts directly with what a Will can and can't control, our Wills and EPOA guide covers that ground in more depth if you're weighing up both at once.

TL;DR

• Joint tenants means all owners hold the property equally, with automatic right of survivorship, if one owner dies, their share passes automatically to the surviving owner(s), not through their Will.

• Tenants in common allows owners to hold specific, potentially unequal percentage shares, with each share able to be left through a Will rather than automatically passing to co-owners.

• Uneven contributions (a larger deposit from one party, different ongoing repayment shares) are generally best reflected through tenants in common with matching ownership percentages, rather than assumed to be handled fairly under equal joint tenancy.

• A written co-ownership agreement, separate from the property title itself, is the single most commonly skipped step, and the one that matters most when circumstances change.

• Exit mechanics need to be planned for in advance: what happens if one party wants to sell their share, can't afford their portion, or the group can't agree on a sale, rather than left to be worked out under pressure later.

• Lender requirements for a co-owned property can differ from a standard single-buyer purchase, including how liability for the full loan is treated between co-owners.

• Co-ownership between family and between friends carries similar structural risks, family relationships don't automatically remove the need for clear, written terms.

Bottom line: the ownership structure and title type decide who gets what and how disputes get resolved, and skipping the written agreement is the single most common reason a co-ownership arrangement that started well ends up in genuine conflict.

On This Page

• Joint Tenants vs Tenants in Common

• Structuring for Uneven Contributions

• Why a Co-Ownership Agreement Matters More Than the Title

• Planning the Exit Before You Need One

• Lender Requirements for Co-Owned Property

• Worked Example: Three Friends, One Property, One Exit

• Common Mistakes

• FAQ

Joint Tenants vs Tenants in Common

Australian property law generally offers two ways for multiple owners to hold title:

• Joint tenants hold the property as equal owners, with right of survivorship, meaning if one owner dies, their interest automatically passes to the surviving joint owner(s), regardless of what their Will says. This structure doesn't allow unequal ownership percentages.

• Tenants in common allows owners to hold specific, potentially unequal shares (such as 60/40 or 70/30), with each owner's share able to be left to whoever they choose through their Will, rather than automatically passing to co-owners.

This choice has significant downstream consequences, particularly for co-owners who aren't a couple, since joint tenancy's automatic survivorship may not reflect what a group of friends or siblings actually intends, particularly where contributions were uneven.

Not sure which title structure actually fits your specific co-ownership situation? A free 15-minute chat with WIAA can help think through it alongside your solicitor. Call 1800 942 843 or book online.

Bottom line: joint tenancy assumes equal shares and automatic survivorship, tenants in common allows specific percentages and individual estate planning control, and the right choice depends entirely on what the co-owners actually intend.

Structuring for Uneven Contributions

It's genuinely common for co-owners to contribute unevenly, one party covering a larger share of the deposit, or ongoing repayment splits that don't match a simple 50/50 arrangement. Tenants in common with matching ownership percentages is generally the more appropriate structure for this situation, since it allows the ownership share on title to actually reflect the real financial contribution, rather than defaulting to equal joint tenancy regardless of who put in more.

This matters not just for fairness at the point of purchase, but for what happens later, at sale, the ownership percentage generally determines how proceeds are split, and getting this wrong at the outset can create a genuinely difficult conversation years later if the title doesn't match what everyone actually understood the arrangement to be.

Bottom line: uneven contributions should generally be reflected in uneven ownership percentages under tenants in common, not glossed over under a simpler but less accurate equal joint tenancy structure.

Why a Co-Ownership Agreement Matters More Than the Title

The property title itself (joint tenants or tenants in common) establishes legal ownership, but it doesn't address the practical, everyday questions that actually cause disputes: who pays for what ongoing costs, what happens if one party can't cover their share of a mortgage repayment temporarily, whether one owner can rent out their portion or bring in a partner to live there, and critically, what the process is if someone wants to sell their share or exit the arrangement. A written co-ownership agreement, separate from the property title, is where these practical terms should be documented, ideally before settlement, not retrofitted after a disagreement has already started.

A co-ownership agreement is the single most commonly skipped document in a co-buying arrangement, and the one that matters most when things get complicated. A free 15-minute chat can help identify what should be included before you buy. Email clientservices@whatifadvice.com.au or book online.

Bottom line: the title tells you who owns what, the agreement tells you how the arrangement actually works day-to-day, and skipping the agreement is the single most common source of later conflict.

Planning the Exit Before You Need One

The most important, and most commonly avoided, part of a co-ownership agreement is the exit plan: what happens if one owner wants to sell their share while the others don't, what happens if someone can no longer afford their portion of repayments, how a sale price or buyout valuation is agreed if one owner wants to be bought out by the others, and what the process is if the group simply can't agree and needs to force a sale. Addressing these questions while everyone's on good terms and thinking clearly is considerably easier than trying to negotiate them for the first time under financial pressure or after a relationship has broken down.

Bottom line: the exit plan is the part of a co-ownership agreement that matters most and gets skipped most, precisely because it's uncomfortable to plan for a scenario nobody wants to imagine at the start.

Lender Requirements for Co-Owned Property

Lenders generally treat co-owned property loans with joint and several liability, meaning each co-owner can be held responsible for the full loan amount, not just their proportional share, if another owner fails to meet their repayment obligations. This is a meaningful practical risk that doesn't always match the ownership percentage split agreed between co-owners, someone with a 30% ownership share can still be pursued by the lender for 100% of the loan if their co-owners default. This is worth understanding clearly and discussing directly with a lender or broker before settling on a co-ownership structure.

Bottom line: the lender's liability structure doesn't automatically mirror the co-owners' agreed ownership percentages, and understanding this joint and several liability risk is essential before signing.

Worked Example: Three Friends, One Property, One Exit

Jess, Amir, and Priya buy a property together as tenants in common, with ownership split 40/30/30 reflecting their different deposit contributions. They put a written co-ownership agreement in place before settlement, covering ongoing cost-sharing, a process for one party wanting to sell their share, and an agreed valuation method if a buyout is needed.

Three years later, Priya's circumstances change and she wants to exit the arrangement to buy her own property elsewhere. Because the co-ownership agreement already specified the process, an independent valuation, a defined window for Jess and Amir to either buy out Priya's share or agree to sell the whole property, and a clear timeline, the exit proceeds relatively smoothly. Jess and Amir choose to buy out Priya's 30% share based on the agreed valuation method, refinancing the loan to reflect the new two-person ownership.

Outcome: because the exit process was agreed in writing before it was ever needed, Priya's exit was resolved through a defined, pre-agreed process rather than an ad hoc negotiation under time pressure or disagreement.

Bottom line: the difference between a smooth exit and a genuinely difficult one usually comes down to whether the process was decided in advance, not worked out for the first time once someone actually wants to leave.

Common Mistakes

• Defaulting to joint tenancy without considering whether tenants in common better reflects uneven contributions. Equal ownership isn't automatically the right structure just because it's the default.

• Skipping a written co-ownership agreement entirely. The title alone doesn't address the practical, everyday questions that actually cause disputes.

• Not planning an exit process until someone actually wants to leave. This is considerably harder to negotiate fairly under pressure than to agree upfront.

• Assuming joint and several liability doesn't apply because ownership percentages are unequal. Lenders can generally pursue any co-owner for the full loan amount regardless of their ownership share.

• Assuming family co-ownership is inherently lower-risk than co-ownership with friends. Family relationships don't remove the need for clear, written terms, and disputes between family members can be just as difficult.

A written co-ownership agreement and a clear exit plan are worth putting in place before settlement, not after a disagreement starts. A free 15-minute chat can help you think through what to include. Call 1800 942 843.

FAQ

What's the difference between joint tenants and tenants in common? Joint tenants hold equal shares with automatic right of survivorship, while tenants in common can hold unequal, specified shares, each able to be left through a Will rather than automatically passing to co-owners.

Do we need a written co-ownership agreement if we're family? It's still strongly recommended, family relationships don't remove the practical risks around uneven contributions, disputes, or exit scenarios that a written agreement is designed to address.

Can one co-owner be forced to cover the full mortgage if another stops paying? Generally, yes, lenders typically apply joint and several liability, meaning any co-owner can be pursued for the full loan amount, regardless of their agreed ownership percentage.

How should we structure ownership if we didn't contribute equally to the deposit? Tenants in common with matching ownership percentages is generally the more appropriate structure, allowing the title to reflect the actual financial contribution rather than defaulting to equal shares.

What happens if one co-owner wants to sell their share and the others don't? This depends entirely on what's agreed in the co-ownership agreement, without one, this can become a genuinely difficult and potentially legally contested situation, which is exactly why planning the exit process in advance matters.

Can we change from joint tenants to tenants in common later? Generally, yes, this is possible through a specific legal process, though it's considerably simpler to choose the appropriate structure from the outset than to change it later.

Does a co-ownership agreement need to be prepared by a solicitor? It's strongly recommended, since the agreement needs to hold up legally and address the specific circumstances of the co-owners, rather than relying on an informal or template arrangement.

What happens to my share if I die while co-owning under joint tenancy? Under joint tenancy, your share automatically passes to the surviving co-owner(s) through right of survivorship, regardless of what your Will states, which is worth understanding clearly before choosing this structure.

Is it harder to get a loan for a co-owned property than a standard single-buyer purchase? Not necessarily harder, but lenders assess it differently, applying joint and several liability across all borrowers, which is worth discussing directly with a broker before applying.

Should the co-ownership agreement address what happens if we want to rent out the property? Yes, generally, decisions around renting, using the property as a primary residence, or bringing in a partner to live there are exactly the kind of practical questions a co-ownership agreement should address upfront.

Ready to Structure a Co-Ownership Purchase Properly?

Buying property with family or friends can genuinely work, provided the ownership structure, contributions, and exit plan are agreed clearly from the start. A free 15-minute chat can help you think it through before you buy.

• Call us: 1800 942 843

• Email: clientservices@whatifadvice.com.au 

• Book online: free 15-minute chat, no cost, no pressure

Still asking what if.

WIAA has helped Australians structure co-ownership arrangements that hold up when circumstances change, across Toowong, Grange, and Melbourne CBD. WIAA operates under AFSL 528250 as an Authorised Representative of Beryllium Advisers Pty Ltd.

General Advice Disclaimer: This article contains general information only and does not take into account your personal objectives, financial situation, or needs. It is not personal financial, tax, or legal advice and should not be relied upon as such. Property title structures, lender liability arrangements, and co-ownership agreements should be reviewed with a qualified solicitor and mortgage broker for your specific circumstances.