Buying Property with a Partner, Friend or Relative: What to Settle First

Buying with a spouse, partner, friend or relative creates several separate relationships: ownership on the land register, obligations under the loan, private arrangements between the buyers, and possibly tax, succession or family-law consequences. One document does not settle all of them.

Joint tenants and tenants in common

Australian land registers record how multiple proprietors hold an interest, but forms and procedures are jurisdiction-specific. As a clear NSW example, the NSW Registrar-General's Guidelines explain that joint tenants have a right of survivorship. A joint tenant's interest passes to the surviving joint tenant or tenants rather than through that person's will while the joint tenancy remains.

The same NSW guidance says tenants in common hold undivided shares, may hold unequal fractions and do not have survivorship. A deceased tenant in common's interest is dealt with through their estate. This does not mean that a particular split is right for you, or that NSW registration steps apply elsewhere.

• Ask how the proposed tenancy and shares will appear on the relevant register.
• Reconcile the title choice with current wills and estate planning.
• Ask about duty, land tax and CGT before changing names or shares later.
• Do not assume a private contribution spreadsheet changes the registered legal interest.

The loan is a separate contract

Ownership percentages do not automatically limit a borrower's liability to the lender. ASIC Moneysmart's Love and loans factsheet warns that a co-borrower is responsible for the joint debt, while a guarantor has a different role. Read the proposed credit contract and mortgage rather than assuming that a 30% title share means responsibility for only 30% of repayments.

Before accepting a loan, obtain written answers to these questions:

• Who is a borrower, mortgagor or guarantor, and what can the lender recover from each person?
• Whose property secures the debt?
• What happens if one person misses payments or wants to leave?
• Can one owner transfer a share or refinance without the lender's consent?
• What insurance or cash buffer, if any, is appropriate for the buyers' circumstances?

What a co-ownership agreement should address

Non-couple co-buyers commonly ask a lawyer to document their arrangement. The useful question is not the document's label but whether it is valid in the relevant jurisdiction and consistent with the title, loan and estate plan. Each person should obtain independent advice about at least:

• initial contributions and the registered ownership shares;
• mortgage, rates, insurance, maintenance and improvement payments;
• occupation, rent, tenants and decisions about the property;
• records for later contributions and reimbursements;
• default, incapacity and death;
• a valuation method, sale process, buy-out timetable and dispute procedure.

A private agreement cannot rewrite the lender's rights, guarantee a tax treatment or necessarily control a later family-law outcome. It should be drafted for the actual buyers, not copied from a template.

Couples and family law

For married and eligible de facto couples, registered title is not a complete prediction of how property and debts will be dealt with after separation. The Federal Circuit and Family Court publishes a guide to dividing property and finances after separation covering agreement, consent orders and court proceedings. The Court also explains that the statutory property framework changed on 10 June 2025, so older summaries may be incomplete.

A “co-ownership agreement” is also not automatically a binding financial agreement under the Family Law Act. The Court says financial agreements are complex and require prescribed independent legal advice. Couples seeking that kind of arrangement should use family-law practitioners, not rely on a conveyancing checklist.

Rental income and tax

If co-owners are not carrying on a rental-property business, the ATO's Rental properties guide says rental income and expenses are generally divided according to their legal interests: equally for joint tenants and according to the registered shares for tenants in common. A private agreement to allocate a larger rental loss to one owner does not, by itself, change that treatment.

Owner occupation, below-market arrangements, private use, loan purpose and later sale can produce different tax outcomes. Obtain registered tax-agent advice before choosing shares for a tax objective. First-home concessions, transfer duty and land tax also vary by state and buyer history; check the relevant revenue authority for the exact transaction rather than assuming one buyer's eligibility covers the other.

Before making an offer

1. Exchange complete information about income, debts, dependants, savings and intended use.
2. Ask the lender or broker to identify each person's contractual role in writing.
3. Have a local property lawyer explain the available tenancy choices and transfer form.
4. Get separate family-law advice where the buyers are a couple and want to regulate separation.
5. Get tax advice where the property will earn income or shares are being chosen for tax reasons.
6. Align the title, agreement, finance and estate documents before committing to the purchase.

For a broader explanation of title and ownership terminology, see property ownership types in Australia.

General information only, not legal, credit, tax or financial advice. Reviewed 24 August 2026. A lawyer qualified in the property's jurisdiction, a family lawyer where relevant, and a registered tax agent should advise on the buyers' actual documents and circumstances.