Buying With Family in NSW — Why Clear Agreements Matter Before You Sign

Buying property with parents, siblings or adult children is increasingly common in NSW as prices outpace individual borrowing capacity. Shared deposits and combined income can open suburbs and property types that would otherwise be out of reach. The legal risk does not arise from the idea itself, but from the lack of structure around it. Many “family deals” start with a handshake, trust and a shared goal, but no plan for what happens when someone wants to leave, relationships change or financial pressure hits.

The most common problems arise from assumptions. One person assumes they own 50% because they are on title, another assumes a larger “beneficial” share because they paid most of the deposit, and someone else thinks they can move a partner in or insist on renovations without consent. When circumstances change – a separation, job loss, new partner or children – these assumptions quickly become disputes, often years after the original purchase. At that point, people rummage through old messages, bank transfers and conversations to reconstruct what was “agreed”.

A better approach is to treat a family co‑purchase like any other significant joint investment. Before you sign a contract, you should agree – in writing – on four core areas:

• Ownership shares: Will title reflect equal shares or actual financial contributions?

• Contributions: Who pays the deposit, stamp duty, legal fees and initial repairs?

• Ongoing costs: How will mortgage repayments, rates, insurance and strata levies be split?

• Exit and dispute process: What happens if one co‑owner wants to sell, refinance or move out?

For example, two brothers buy a house in Western Sydney. One contributes 70% of the deposit and plans to live there, while the other contributes 30% and will rent his room to a friend. A written co‑ownership agreement can specify that ownership is 70/30, that both pay mortgage instalments in proportion to their share, that the live‑in brother approves any tenant, and that if one wants to sell, the other has first option to buy them out at an agreed valuation method. If the relationship later strains, the document becomes a roadmap rather than the starting point of an argument.

Parents helping children is another high‑risk area. Many intend their contribution as a loan, but never document it. If the child separates, the ex‑partner may argue that the money was a gift, not repayable nor giving the parents any claim. NSW practitioners recommend at least a written loan agreement and, where appropriate, consideration of a mortgage or caveat to reflect the parents’ interest. This is not about undermining trust; it is about protecting everyone if the unexpected occurs.

Co‑ownership also intersects with estate planning. If a co‑owner dies, does their share pass automatically to the other (joint tenancy), or into their estate to be divided by their will (tenancy in common)? The choice should reflect the underlying deal and family dynamics, not be left to default rules.

Ultimately, buying with family can work well when the legal structure matches reality. Take time up‑front to define contributions, ownership, decision‑making and exits. Doing so protects the property, but more importantly, it protects the family relationships the purchase was meant to support.

This article is general information only and is not legal advice. You should obtain advice tailored to your specific circumstances before making any decisions about buying property with family.