How Joint Home Loans Work in Australia
A joint home loan is a mortgage where two or more people apply together and share responsibility for the debt. All borrowers are equally liable for the full loan amount — not just their share of it. If one borrower cannot make their repayments, the other(s) are legally responsible for the entire amount. This concept is called "joint and several liability" and it is the defining feature of a co-borrower arrangement.
Joint home loans are most commonly used by:
- Couples (married, de facto, same-sex) buying a family home
- Friends or siblings pooling resources to enter the property market
- Parents and adult children buying together, sometimes with the parent as co-borrower rather than guarantor
- Investment partners acquiring an investment property jointly
How Lenders Assess Joint Applications
When you apply for a joint home loan, the lender considers the combined financial position of all borrowers. This includes both the benefits (higher combined income) and the risks (combined liabilities and credit histories).
Combined Income Assessment
All borrowers' incomes are pooled for the serviceability assessment — full-time, part-time, casual, self-employed and investment income can all be included (subject to lender policy on each type). This is the primary reason joint applications are popular: a $600,000 combined income can support a substantially larger loan than a $300,000 individual income.
Combined Liabilities
All existing debts are also combined: personal loans, car finance, credit card limits, HECS repayments, and any existing mortgage repayments. Even debts in only one borrower's name affect the joint assessment. A partner with a large car loan or high credit card limits will reduce the joint borrowing capacity.
Both Credit Histories Are Reviewed
Lenders pull credit reports for every borrower. If one applicant has defaults, missed payments, or multiple recent credit enquiries, this affects the entire application. The weakest credit file in the group tends to drive the lender's risk assessment, not the strongest. If one applicant has credit issues, a broker can advise whether a joint application is the right approach or whether a guarantor structure might achieve a better outcome.
⚡ Key Lender Rule: Combined Deposit
Your deposit is assessed on the combined purchase, not each individual's contribution. If two buyers each contribute $80,000 toward a $1,200,000 purchase, the combined $160,000 deposit represents an LVR of approximately 86.7% — meaning LMI applies unless a scheme is used. Each individual's portion alone would not get them close to purchase. Use our Smart Home Loan Check to model your combined position.
Ownership Structures: Your Critical Legal Choice
How you hold legal title to the property is entirely separate from how the mortgage is structured — and it has significant implications for tax, inheritance and what happens if the relationship between owners changes. There are two main structures:
Joint Tenancy
Under joint tenancy, all owners hold equal shares in the property, and if one owner dies, their share automatically passes to the remaining owners (the "right of survivorship") — regardless of what their will says. Joint tenancy is the most common structure for married couples. It cannot be used when owners want to hold unequal shares.
Tenants in Common
Under tenants in common, each owner holds a specified share of the property (which can be equal or unequal — for example 60% and 40%). Each owner can independently sell, mortgage or bequeath their share. If one owner dies, their share passes according to their will (not automatically to the other owner). Tenants in common is generally recommended for:
- Friends or siblings buying together
- Couples who have contributed unequal deposits and want this reflected in ownership shares
- Investors who want to split rental income and capital gains in specific proportions for tax purposes
- Any situation where the owners want independent control over their share
💡 Get Legal Advice on Ownership Structure
Your mortgage broker handles the loan — but your conveyancer or solicitor advises on the ownership structure. This is a decision that should be made deliberately and in writing before exchange of contracts. Changing from joint tenancy to tenants in common after settlement requires a formal deed of severance and additional legal costs. Legal Aid NSW provides free initial legal advice on property ownership matters.
Co-Borrower vs Guarantor: What's the Difference?
A co-borrower is named on the loan and (usually) on the title — they are a full owner and full debtor. A guarantor is not on the title (doesn't own the property) but provides security (usually their own property's equity) to support the borrower's application. Both approaches can help with borrowing capacity or deposit challenges, but they have very different legal and financial implications. Read our complete guarantor home loan guide for details.
How a Joint Application Changes Your Borrowing Capacity
A joint application almost always increases borrowing capacity compared to either borrower individually — but the increase is not always proportional to the combined income increase. Here's why:
- Combined living expenses are higher for two people than one, which the lender factors in
- Both borrowers' existing debts reduce the available serviceability
- HECS repayments from both borrowers are both included in the assessment (see our HECS guide)
- One borrower's self-employment or casual income may be assessed more conservatively
Use our Smart Home Loan Check to get an estimate, then speak to a broker who can run a full combined assessment across multiple lenders to find the maximum borrowing capacity available for your combined position.
If Your Circumstances Change
Life changes — relationships end, financial situations shift, one buyer wants to exit. Planning for this before you purchase is far better than dealing with it in crisis. Here's what happens in different scenarios:
Couple Separation
When a relationship ends, you typically have three options: sell the property and split proceeds, one partner buys out the other (requiring a new single-name loan assessment), or continue co-owning (rare and usually only viable short-term). A binding financial agreement or property settlement order from the Family Court provides legal certainty. Your broker can then advise on refinancing options.
Friends or Business Partners
It is strongly advisable for non-couple joint purchasers to enter a formal co-ownership agreement (drafted by a solicitor) before settlement that addresses: what happens if one party wants to sell, how running costs are split, what happens if one party cannot service their share of the mortgage, and an exit mechanism. This agreement is separate from the mortgage documentation.
Removing Someone from a Joint Home Loan
Removing a borrower from a joint mortgage requires the remaining borrower(s) to demonstrate to the lender that they can service the full loan on their own. The process involves:
Serviceability assessment
The remaining borrower must prove their income is sufficient to service the entire loan independently. If they cannot, an alternative structure (such as adding a new co-borrower) or a different lender may be needed.
Legal documentation
A property settlement order (for separated couples) or a deed of assignment of equity (for other arrangements) is typically required by the lender. Stamp duty implications may apply on the transfer of the departing borrower's share.
New credit assessment
The remaining borrower submits a new full application, which is assessed on its own merits. If the original lender cannot approve it, your broker can find a lender that can.
✅ Planning a Joint Purchase?
Our broker partners can assess your combined borrowing capacity across 50+ lenders, advise on ownership structures, and ensure your joint application is structured for the best possible outcome. Book a free strategy call or start with our Smart Home Loan Check.
Frequently Asked Questions
Yes. Two or more people can apply for a joint home loan regardless of their relationship. Lenders assess the combined income, expenses and credit histories of all applicants. You will also need to decide on a legal ownership structure — tenants in common is generally preferred for non-couple purchases as it allows each person to specify their share and include the property in their will independently.
Yes, in most cases. Combined income from both borrowers is assessed together, and the resulting borrowing capacity is generally higher than either borrower could achieve individually. However, combined liabilities (debts, credit card limits) are also assessed jointly, so the net benefit depends on each borrower's individual financial position.
If you separate, you have several options: one person can buy out the other's share (refinancing the loan into a single name), you can sell the property and split the proceeds, or you can continue to co-own (uncommon but possible). Most lenders require a formal legal agreement (such as a property settlement order or binding financial agreement) before refinancing into one name. A family lawyer and your mortgage broker should both be involved in this process.
Yes, but it requires the remaining borrower to be able to service the loan on their own income. The lender will conduct a full new credit assessment. This is called "refinancing to a single name" and is treated as a new application. If the remaining borrower's income is insufficient, an alternative lender may be needed.
No. It is possible for one borrower to be an owner-occupier and the other an investor, or for one borrower to be a guarantor rather than an owner. Different lenders have different policies on this. Your broker will identify the most suitable lender and structure for your specific situation.