What You Need to Know About Co-Buying Property With a Friend or Sibling

(Pooling resources to buy property together, how to make it smart, safe and aligned with your wealth plan)

In recent years, more Australians are turning to shared property ownership with a friend, sibling, or close family member. With property prices rising and borrowing hurdles loosening in some cases, teaming up can be a clever way to get a foot on the ladder, or purchase a better property than you might afford solo. 

But while the idea of “buying together” sounds appealing, the financial, legal and relationship implications can be complex. This article helps you approach co‑ownership from a financial‑advice perspective, so you understand not just whether you can afford it. But should you? And how to make it work in a way that supports your long‑term wealth plan.

Why Co‑Buying Makes Increasing Sense Right Now

Property affordability in Australia has challenged many would‑be buyers: higher prices, tighter lending, and competition. One strategy emerging: co‑ownership.
By pooling deposit, income and borrowing power, you may enter the market earlier or secure a more desirable asset. 

Here are some of the key motivations:

• Shared deposit burden: Rather than one person saving tens of thousands alone, two (or more) parties each contribute smaller amounts.
• Stronger borrowing capacity: When two incomes are considered, your combined capacity may enable a better loan or better property.
• Access to quality property: Instead of compromising, you may step up to a better location or property type earlier.
• Shared risk: Costs such as maintenance, rates, and insurance can be spread across buyers.

For example, this HouseSeeker guide notes that many first‑time buyers are using co‑ownership arrangements to offset affordability challenges. 

Yet, for all the upsides, shared ownership isn’t like buying on your own. It’s a financial, legal and relationship partnership. And like any partnership, clarity and structure matter.

The Important First Question: Are You Financially Aligned?

Before you start property searching, chalk out the financial heavy‑lifting questions.

How Much Each Person Can Contribute

How much deposit will each person bring? What portion of ongoing repayments will each commit to? If one owner contributes significantly more, does ownership reflect that (e.g., 60/40 rather than 50/50)?

How Long Do You Plan to Own

Is the plan long‑term (10- 15+ years) or short‑term (sell in 5 years)? How will that impact each party’s future goals and flexibility?

Emergency Buffers & Debt

Co‑ownership still carries risk. If one party loses income, undergoes major repairs, or experiences life events that shift, can both parties cope? The lender will see both incomes, and any half‑measure can risk borrowing capacity or future lending for either party. 

Your Exit Strategy

What happens if one co‑owner wants to sell? Or divorce? Or relocates overseas? These scenarios aren’t unlikely, especially with siblings or friends. These discussions must happen early.

Addressing these questions before you sign anything means you’re entering credible alignment, not just hopeful synergy.

Legal & Ownership Structure: The Foundation of Co‑Ownership

Once you’re financially aligned, the next step is proper structure. In Australia, there are two main ways to own property together: Joint Tenancy and Tenants in Common.

• Joint Tenancy: Each owner holds an equal share (typically 50/50) in the property, and when one co‑owner dies, their share automatically passes to the other(s).
• Tenants in Common: Each owner holds a defined share (eg, 60/40), which they can sell or pass via their will independently and with more flexibility.

Which one you choose depends on your relationship, contribution, risk appetite, and future plans. Many advisers prefer Tenants in Common for friends or siblings because it permits different contribution levels and clearer individual estate planning.

The Must‑Have Document: Co‑Ownership Deed

This is more than nice‑to‑have. It should outline:

• Ownership share
• Each party’s contribution (deposit, repayments, maintenance)
• Decision‑making rights
• What happens if one party wants to sell or is unable to repay
• Exit strategy or buy‑out provisions

A well‑drafted deed is one of the best ways to avoid relationship stress and financial surprise.

Financing, Lending & Risk Considerations

When you apply for a home loan as a group, lenders assess all parties’ debts, incomes and credit. Borrowing with others may help increase capacity, but it also links you financially.

Key risk areas:

• If one co‑owner defaults or becomes ill, it may impair credit or financial options for the other(s).
• After purchase, refinancing or accessing additional credit can be more complex due to shared liability.
• Costs such as stamp duty, conveyancing, legal fees, rates and maintenance still need to be clearly shared.

When discussing finance, consider:

Contribution Clarifications

Who pays what? Deposit, stamp duty, legal fees, repayments, upkeep?

Different Income Levels

If one partner earns significantly more, does that reflect in share ownership and voting rights?

Future Borrowing Plans

Will one partner want to purchase separately later? How does this purchase impact future borrowing capacity?

Budget for the “Other Costs”

Legal fees, co‑ownership deed, higher mortgage repayments (due to two incomes), and possible future costs of selling the share.

Relationship Dynamics & Practical Considerations: Real Life Matters

Let’s be honest: moving in with a friend is one thing. Buying property with them? That’s next‑level commitment.

Communication Is Everything

Talk about: how you will manage repairs, rent vs own, shared use if property is partially invested, what happens if someone wants out.

Own Your Individual Life

Just because you buy together doesn’t mean all decisions must be unanimous forever. Set clear boundaries around which major decisions require both parties and which don’t.

Changes Happen (Jobs, Relationships, Kids)

What happens if one person wants to upgrade, relocate, or change marital status? Life changes; planning for that matters more than hoping it won’t.

Have Regular Check‑Ins

Annual or biannual discussions to review responsibilities, financial health, and any changes in each owner’s situation.

One anecdotal example: A pair of siblings buy in Melbourne, one handles the rental component, one lives there, and they split costs 60/40. Five years later, the sibling living there wants to upgrade; they hadn’t documented exit terms, resulting in months of uncertainty, legal advice costs, and emotional strain. The story isn’t uncommon. 

The Financial Advice Angle: Fit the Structure into Your Wealth Plan

As financial advisers, we often see people focus on the “buy” part (deposit, loan, and location) but not on how this relates to their overall financial lifestyle and long‑term goals.

Here’s how you can integrate co‑ownership into your broader plan:

Impact on Goals

Will this purchase shift your retirement or other goal timeline? Is the risk acceptable?

Liquidity & Options

Real estate is illiquid. If one partner wants to exit, you may not be able to sell their share quickly or without affecting the other partner’s plans.

Tax and Benefits

If you plan for investment or owner‑occupier, discuss rental income, negative gearing, capital gains tax, and even first‑home buyer incentives (for co‑ownership arrangements). 

Estate Planning & Succession

Especially with siblings, ensure your share can pass smoothly. Tenants in Common often gives more flexibility for wills and estate planning.

Exit Strategy & Flexibility

Let’s repeat this: it matters. If your long‑term strategy is rigid, you may end up compromising later.

As a client of ours once said, “Pooling with my brother made sense because we both wanted the same suburb in the Inner West suburbs. But if I hadn’t asked: ‘What if I want to move in 10 years?’ I might have locked into something less flexible than I thought.” In truth, the best financial decisions aren’t just about making one good move; they’re about making one good move that stays good 5‑10‑20 years later.

Checklist: Before You Sign Anything

Here’s a checklist to guide you through the process:

• Get a written co‑ownership deed drafted by a property lawyer
• Decide ownership structure (Joint Tenancy vs Tenants in Common)
• Agree on contributions, repayments and ownership shares.
• Clarify decision‑making rights and exit strategy.
• Review loan approval, each owner’s debt and future borrowing capacity.
• Seek advice on tax implications (CGT, deduction eligibility).
• Consider insurance cover (life, income protection) for all co‑owners.
• Set regular review meetings (minimum annually).
• Have your financial adviser model how this purchase fits into your long‑term plan.

Shared Ownership, Powerful Opportunity, Serious Responsibility

Co‑buying property with a friend or sibling is a potent strategy; it can accelerate your property journey, increase purchasing power and help you build wealth earlier than you thought. But it’s not a casual move. The financial, legal and human elements have to be aligned.

Treat this like a business partnership. Plan it like one. Structure it like one. Review it like one. Because the friendships, relationships and financial lives you’ve built deserve nothing less.

Ready to Explore Co‑Ownership with Confidence?

At Ryker, we help Australians weigh opportunities like shared property ownership within a holistic wealth framework, so you don’t just buy property, you build your life. Contact us for a no‑obligation chat, and let’s map whether buying together makes sense for you, your financial future, and your relationship.