Buying a House With Someone Else in Australia: How It Actually Works

More Australians are buying property with someone other than a spouse — friends pooling deposits, siblings inheriting together, parents helping a child in, investors teaming up. It's often the only realistic way into the market. But "buying together" hides a lot of moving parts, and the ones people misunderstand are exactly the ones that cause trouble later. Here's how it actually works.

Who buys together — and why it changes things

Co-buying isn't one situation, it's several, and the right setup depends on which one you're in:

• Couples — usually equal contributions, often want the property to pass automatically to the other if one dies.
• Friends — frequently unequal deposits and incomes; need clear, definable shares and a clean exit path.
• Parent and adult child — the parent may contribute capital without wanting to live there or share the gain equally.
• Investors (2–4 people) — treat it as a business: contributions, returns, and exits all need to be documented.

The mechanics below apply to all of them — but the fairness of how you set them up depends on being honest about which case you're actually in.

The three things people conflate

This is the single most useful thing to understand before you buy with someone. Title share, deposit split, and loan liability are three separate things. People assume they're the same. They're not.

1. Title share — who owns what on paper

In Australia you'll hold the property as joint tenants or tenants in common:

• Joint tenants — you own the whole thing together, and if one owner dies their share passes automatically to the other(s). Common for couples.
• Tenants in common — you each hold a defined share (say 60/40), which you can set unequally and leave to whomever you choose in your will. Usually the right fit for friends, family, and investors.

We cover the difference in full in tenants in common vs joint tenants.

2. Deposit split — who actually paid what going in

Your title share often reflects the deposit split, but it doesn't have to, and deposits are rarely even. One person might bring more savings, a family gift, or a First Home Super Saver amount. What matters is that every dollar in is recorded against the person who paid it — because that record is what makes a fair outcome possible years later.

3. Loan liability — the part that surprises people

Here's the one that catches co-buyers off guard. When you take out a mortgage together, you're almost always jointly and severally liable. That means each of you is legally responsible for the entire loan — not just "your half."

If your co-owner can't pay their share, the lender can pursue you for the full repayment. And because your name is on the debt, that mortgage counts against your borrowing capacity if you later try to buy something else. Loan liability is shared in full even when ownership is split 60/40. This isn't a reason not to co-buy — it's a reason to choose who you buy with carefully and to keep the repayments transparent.

What actually happens at settlement and after

In practice, buying with someone else looks like this:

1. You agree the ownership structure and shares, and your conveyancer records them on the title.
2. You apply for the loan together; the lender assesses your combined income and liabilities.
3. At settlement the deposit and costs are paid, and everyone's name goes on title and (usually) on the loan.
4. From then on, repayments, rates, insurance, and repairs are shared costs — and this is where most co-ownerships quietly go wrong, because nobody keeps a running, agreed record of who paid what.

The purchase is a single day. The tracking is the next 30 years — and it's the tracking, not the purchase, that determines whether an eventual exit is arithmetic or an argument.

What to nail down before you sign

If you're going to buy with someone, decide these up front (the full step-by-step is in how to buy property with a friend or partner):

• Ownership structure and shares (joint tenants vs tenants in common).
• How the deposit and ongoing costs are split — and how you'll record them.
• How repayments are split (it doesn't have to match the title share).
• A co-ownership agreement covering valuation, a first right of refusal, and a dispute process — get your own legal advice.
• The exit plan — how a fair buyout is calculated before anyone needs it.

Keep the record straight from day one

Propact is built for exactly this. It tracks each owner's contributions, splits the mortgage and costs the way you actually pay them, and shows each person's fair equity over time — so whether you're a couple, two friends, or an investor group, the numbers are always agreed rather than argued.

Create a free account to set up your property, or explore the free calculators to see how equity, repayments, and a buyout are worked out.

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This article is general information, not legal, financial or tax advice. Ownership structures, loan liability, and tax outcomes depend on your circumstances — speak to a licensed conveyancer, mortgage broker, and accountant before buying with someone else.