How Do Lenders Calculate Borrowing Capacity for a Couple Applying Together?
Two incomes improve your position. Two sets of debts, credit cards, and HECS repayments reduce it. The net result is usually still better than applying alone — but knowing the full picture before you apply matters.
Actual borrowing capacity outcomes vary widely between lenders and borrower circumstances.
A joint application typically increases borrowing capacity substantially — but it’s not as simple as adding two incomes together. Lenders combine incomes and also combine all liabilities.
How Combined Income Works
Lenders use both incomes in full for serviceability purposes. A couple earning $85,000 and $70,000 has a combined assessed income of $155,000. This typically allows borrowing in the $800,000–$950,000 range before debts and expenses are factored in, though the specific figure varies by lender.
How Combined Liabilities Work
Both applicants’ credit cards, personal loans, HECS debts, car loans, and ongoing financial commitments are included in the assessment. A partner with a $15,000 credit limit and $40,000 HECS balance brings those liabilities into the joint assessment.
Employment Type Matters for Each Applicant
If one partner is PAYG and the other is self-employed, contract, or on parental leave, the lender assesses each income differently. A self-employed partner’s income may be calculated on a 2-year average of tax returns rather than current earnings.
Whose Name Should the Loan Be In?
For owner-occupiers, a joint loan is standard and maximises borrowing capacity. For investors, naming structure has tax implications — income is attributed to ownership share, which affects negative gearing calculations. This is worth discussing with a tax adviser before committing to a structure.
You may wish to speak with a licensed mortgage broker to assess your personal circumstances.
This is general information only. Borrowing capacity calculations for joint applicants vary by lender and circumstance. Speak with a licensed mortgage broker before structuring an application. All loans are subject to lender approval.
Sources: APRA Prudential Practice Guide APG 223; ATO, Joint Property Ownership; MFAA Industry Intelligence Service Report 2025.
