Buying property with family members is increasingly common in Sydney — combining incomes makes higher-priced homes reachable that no single buyer could afford. But joint purchases come with important legal and financial considerations most buyers don't think about until it's too late.
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Who Can Buy Property Together in Australia?
Any two or more adults can purchase property together in Australia — there are no restrictions on relationship type. Common combinations include:
- Partners / spouses buying together (most common)
- Parent and child buying together to help the child enter the market
- Siblings splitting the cost of an investment or first home
- Two unrelated friends or colleagues pooling resources
- Multiple family members (e.g., parents + two adult children)
Lenders can accept up to 4 borrowers on most applications, though some have restrictions. Each borrower's income, debts, and credit are all assessed as part of the combined application.
The Two Ownership Structures: Joint Tenants vs Tenants in Common
When buying with another person, you must choose how legal ownership is held. This is one of the most important decisions — and it's irreversible without legal process after purchase.
Joint Tenancy
Both owners hold an equal, undivided share of the entire property. If one owner dies, their share passes automatically to the surviving owner (right of survivorship) — regardless of what the will says. This structure is typical for married couples or partners.
Tenants in Common
Each owner holds a defined share — which can be equal (50/50) or unequal (e.g., 70/30, 80/20). Each share can be separately willed to anyone. If one owner dies, their share goes to their estate — not automatically to the other owner. This structure is common for family purchases with unequal contributions, or for investors buying with people who aren't partners.
Which structure should you choose?
There is no universally correct answer. The right structure depends on your relationship, contribution amounts, tax situation, and estate planning goals. Your conveyancer will guide you — but the key is to discuss and agree before settlement, not after.
How Lenders Assess Joint Applications
When you apply for a joint home loan, the lender assesses all borrowers together. This means:
- All incomes are combined — increasing total borrowing power
- All debts and expenses are combined — including any debts one party has alone
- The weakest credit profile affects the application — if one person has bad credit, it impacts the joint application
- All borrowers are equally and fully liable for the entire debt — not just "their share"
That last point is crucial. In a joint loan, each borrower is jointly and severally liable — meaning the lender can pursue any one of you for the full loan amount if the other stops paying. This is why trust and financial compatibility between co-borrowers matters enormously.
Want to know what your family can borrow together?
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Can One Person Leave a Joint Mortgage?
Yes — but it requires refinancing the loan. If a co-borrower wants to exit (e.g., after a relationship breakdown, or after the child becomes financially independent), the remaining borrower(s) must refinance into a new loan that they can service on their own. The lender must approve this. If the remaining borrower's income isn't sufficient to service the full loan alone, the exit can be difficult.
This is why planning the exit strategy from the start matters. A co-ownership agreement (separate from the mortgage documents) can define what happens if one party wants to sell, can no longer contribute, or passes away. Your solicitor or conveyancer can draft this.
Does a Joint Purchase Affect First Home Buyer Grants?
This is where it gets important for family buyers. For the First Home Guarantee (FHBG) and stamp duty exemption in NSW:
- All purchasers must be eligible first home buyers — if a parent who already owns property is a co-purchaser, the stamp duty exemption is lost
- For the FHBG specifically, from July 2023 friends and siblings (not just couples) can jointly apply — but both must be first home buyers
- A guarantor arrangement (parent provides security but isn't on the title) is different from a joint purchase — and doesn't affect the child's first home buyer status
If you want to buy jointly with a parent who already owns property, speak with a broker before structuring the purchase — a guarantor arrangement may preserve your first home buyer benefits while still allowing parental support.
Parent + Child Purchase: Special Considerations
Buying with parents is one of the most common "family purchase" scenarios in Western and Southwest Sydney. It's typically structured in one of two ways:
- Joint purchase (both on title and loan): Increases combined borrowing power but the parent co-owns the property and the child loses first home buyer status if the parent already owns
- Guarantor arrangement (parent on loan as guarantor, not on title): The child purchases alone — parent provides their home as additional security — child retains first home buyer status, and the parent doesn't appear on the property's title
The guarantor structure is often more tax-efficient and preserves both parties' individual legal positions more cleanly. However, it requires the parent to have sufficient equity in their existing property. A broker can model both options for your specific situation.
Sibling Purchases: What to Consider
Siblings buying together is increasingly common in Sydney's high-price market. Key things to agree on before you sign anything:
- What happens if one sibling wants to sell and the other doesn't?
- What happens if one sibling can't make their repayments?
- Is the ownership split 50/50 or based on contribution?
- Who will live in the property and who (if anyone) will rent?
- How will renovation costs and maintenance be shared?
A co-ownership agreement drafted by a solicitor before purchase gives everyone clarity and a roadmap if circumstances change. It's not pessimism — it's good planning.
Mortgagefy helps family buyers across Bankstown, Liverpool, Parramatta, Lakemba and all of Western and Southwest Sydney. We understand the nuances of joint purchases and can help you find the right lender and structure from the start — free consultation.
Use our Sydney home loan calculator to estimate your joint borrowing power, and explore our guides on first home buyer loans and guarantor home loans to understand your structure options.
Get Your Joint Purchase Structured Right
We help families across Sydney buy together — the right structure makes a big difference long-term.
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