How Lenders Assess Your Borrowing Capacity for a Home Loan in Australia

Understanding how lenders determine your borrowing capacity is crucial when you’re planning to buy a property in Australia. Your borrowing capacity—the maximum amount a lender is willing to loan you—shapes your property search and budget. Lenders don’t just look at your income; they conduct a comprehensive assessment of your financial situation, including your expenses, debts, credit history, and the overall economic environment. In 2025, with interest rates and living costs remaining elevated, lenders have tightened their serviceability criteria, making it more important than ever to present a strong financial profile.

This article breaks down the key factors Australian lenders evaluate, the role of serviceability buffers, and practical steps you can take to improve your borrowing power.


1. Income Assessment: The Foundation of Borrowing Capacity

Your income is the starting point for any borrowing capacity calculation. Lenders categorize income into different types and apply varying levels of scrutiny to each:

• Base salary or wages: This is the most straightforward income type. Lenders typically use 100% of your gross base income, verified through recent payslips and employment confirmation.
• Variable income: This includes overtime, bonuses, commissions, and allowances. Lenders generally use a percentage of this income—often 80% or less—and require a history of consistent payments, usually over two years. In 2025, lenders remain cautious and may average variable income over the most recent 12–24 months.
• Self-employed income: For business owners and freelancers, lenders look at net profit before tax from the last two years’ tax returns and business financials. They may add back certain non-cash expenses like depreciation. However, if income has declined recently, they will use the lower figure.
• Rental income: If you own investment properties, lenders include a portion of the rental income (typically 75–80%) to account for vacancies and expenses. Negative gearing benefits are also considered.
• Other income sources: This includes government benefits, child support, and investment dividends. Lenders accept these if they are stable and ongoing, often requiring evidence of regular deposits.

Key takeaway: The more stable and verifiable your income, the higher your assessed borrowing capacity. Lenders favor borrowers with a long employment history in the same industry.

2. Expenses and Living Costs: The Realistic Budget Check

After assessing your income, lenders deduct your living expenses to determine how much you can realistically afford to repay. Gone are the days when lenders used standard benchmarks like the Household Expenditure Measure (HEM) alone. Since the Banking Royal Commission, lenders must verify your actual expenses.

Lenders categorize expenses into:

• Essential expenses: Housing costs (rent or current mortgage), utilities, groceries, transport, insurance, and childcare.
• Discretionary expenses: Dining out, entertainment, subscriptions, holidays, and clothing.
• Debt repayments: Existing loan repayments (car loans, personal loans, credit cards, HECS-HELP debt) are deducted directly. Credit card limits are assessed as if fully drawn, even if you pay them off monthly.

Lenders typically use the higher of your declared expenses or the HEM index for your household size. In 2025, the HEM index has been updated to reflect rising living costs, which can reduce borrowing capacity for many applicants. To improve your position, reduce discretionary spending and pay down credit card limits well before applying.

3. Credit History and Credit Score: The Trust Factor

Your credit report is a critical component of the assessment. Australian lenders use comprehensive credit reporting (CCR), which includes both positive and negative data. Your credit score (ranging from 0 to 1,200) reflects your creditworthiness.

Lenders look for:

• Repayment history: Any missed payments, defaults, or late payments in the last two years can significantly hurt your application. Even small defaults under $150 can be a red flag.
• Credit inquiries: Multiple applications in a short period suggest credit stress. Try to limit applications to a single lender or use a mortgage broker to compare without multiple hits.
• Existing debts: High credit card limits, personal loans, and buy-now-pay-later accounts reduce your borrowing capacity. Lenders assume you could max out these facilities.

2025 context: With the cost of living pressure, more Australians are using buy-now-pay-later services. Lenders now treat these as liabilities, often requiring them to be closed before approval.

A strong credit score can sometimes offset a borderline application, but a poor score may lead to rejection or higher interest rates.

4. Serviceability Buffer: The Stress Test

One of the most significant factors in borrowing capacity is the serviceability buffer. The Australian Prudential Regulation Authority (APRA) requires lenders to assess your ability to repay the loan at an interest rate that is 3 percentage points above the loan’s actual rate (or a minimum floor rate set by the lender).

For example, if you apply for a loan with a rate of 6.00%, the lender will assess your repayment capacity as if the rate were 9.00%. This buffer ensures you can withstand future rate rises. In 2025, with the cash rate at elevated levels, this buffer can severely limit how much you can borrow.

How it works in practice:

Loan Scenario	Actual Rate	Assessment Rate	Monthly Repayment on $500k (30yr)
Owner-occupier P&I	6.00%	9.00%	$3,995 (actual) vs $4,823 (assessed)
Investor P&I	6.50%	9.50%	$3,160 vs $4,223

Assessed repayment based on buffer rate. Figures are approximate and for illustration only.

The buffer means that even if you can comfortably afford the actual repayments, the lender may still decline your desired loan amount. To increase your borrowing capacity, consider a longer loan term (up to 30 years) or making a larger deposit to reduce the loan amount.

5. Loan-to-Value Ratio (LVR) and Deposit Size

Your deposit size directly impacts your borrowing capacity through the Loan-to-Value Ratio (LVR). LVR is the loan amount divided by the property value. A lower LVR (i.e., a larger deposit) signals lower risk to the lender.

• LVR ≤ 80%: No Lenders Mortgage Insurance (LMI) is required. You’ll access better interest rates and may be able to borrow more.
• LVR > 80%: LMI is required, which protects the lender, not you. LMI can be a significant upfront cost and may reduce the maximum loan amount.
• LVR > 95%: Very few lenders will approve loans above this threshold, and only with strong income and credit profiles.

In 2025, many lenders offer competitive rates for borrowers with an LVR below 70%. Saving a larger deposit not only reduces your LVR but also demonstrates financial discipline, which can positively influence the lender’s assessment.

6. Existing Debts and Liabilities: The Deduction Phase

All existing debts reduce your borrowing capacity dollar-for-dollar in the serviceability calculation. Lenders consider:

• Mortgages on other properties: Full repayment amounts, including principal and interest.
• Personal loans and car loans: Monthly repayments.
• Credit cards: The limit, not the balance, is used to calculate a monthly repayment (typically 3% of the limit).
• HECS-HELP debt: Repayments are based on your income threshold and are deducted from your after-tax income.
• Buy-now-pay-later accounts: Lenders treat these as ongoing commitments, often estimating a monthly expense based on recent usage.

Tip: Before applying, pay off as many small debts as possible and reduce credit card limits. Even closing unused cards can boost your borrowing capacity significantly.

7. Property Type and Location: The Asset’s Role

Not all properties are treated equally. Lenders assess the property itself as security for the loan. Factors that affect borrowing capacity include:

• Location: Properties in small regional towns or high-risk areas (e.g., flood zones) may have lower acceptable LVRs, requiring a larger deposit.
• Property type: Apartments, especially those in high-density blocks or with unique titles (e.g., serviced apartments), may be restricted to lower LVRs or not accepted at all.
• Size and zoning: Very small apartments (under 40 sqm) or properties on large acreage may be subject to stricter lending criteria.
• Postcode restrictions: Some lenders have blacklisted postcodes due to economic dependency or oversupply concerns.

Before making an offer, check with your lender or broker that the property type and location are acceptable. This can prevent a last-minute decline.

Practical Tips to Improve Your Borrowing Capacity

1. Reduce discretionary spending for at least three months before applying. Lenders may ask to see bank statements.
2. Pay down credit cards and close unused accounts. Even a $10,000 limit can reduce your borrowing power by $30,000–$50,000.
3. Consolidate personal loans into a single, lower-rate facility if possible.
4. Improve your credit score by paying all bills on time and correcting any errors on your credit report.
5. Consider a guarantor loan if a family member can offer their property as security, effectively reducing the LVR.
6. Shop around but avoid multiple credit inquiries. Use a mortgage broker to compare lenders without impacting your credit score.
7. Choose a longer loan term (30 years) to lower assessed monthly repayments, though this increases total interest paid.

FAQ

How much can I typically borrow based on my income?

As a rough guide, lenders may lend 5–6 times your gross annual income, but this varies widely based on expenses, debts, and the serviceability buffer. For example, a single person earning $100,000 with no debts and moderate expenses might borrow around $500,000–$600,000. Use an online borrowing capacity calculator for a personalized estimate.

Does a bigger deposit always mean I can borrow more?

Not necessarily. While a larger deposit reduces your LVR and may eliminate LMI, your borrowing capacity is primarily determined by your income and expenses. However, a bigger deposit can help you qualify for a larger loan if your income supports the repayments because the assessed loan amount is lower.

Can I include my partner’s income even if they have bad credit?

Yes, but the lender will assess your combined income and expenses. If your partner has a poor credit history, it could affect the application. Some lenders may allow you to apply solely in your name if your income is sufficient, but you cannot include your partner’s income in that case.

How do lenders treat casual or contract income?

Casual and contract income is considered less stable. Lenders typically require at least 12 months of consistent history in the same role, and they may use a lower percentage (e.g., 80%) of that income. Some lenders are more flexible than others, so a mortgage broker can help find a suitable lender.

What is the Household Expenditure Measure (HEM) and why does it matter?

The HEM is a benchmark of median living expenses for different household types. Lenders use the higher of your declared expenses or the HEM to estimate your living costs. If you declare very low expenses, the HEM acts as a floor. In 2025, the HEM has been adjusted upward, which can reduce borrowing capacity for those who are frugal.

References

1. Australian Prudential Regulation Authority (APRA), “Prudential Practice Guide APG 223 – Residential Mortgage Lending,” 2023. https://www.apra.gov.au
2. Australian Securities and Investments Commission (ASIC), “Responsible lending guidance,” updated 2024. https://asic.gov.au
3. Reserve Bank of Australia, “Statement on Monetary Policy – February 2025,” 2025. https://www.rba.gov.au
4. Australian Banking Association, “Borrowing capacity and serviceability – consumer guide,” 2024. https://www.ausbanking.org.au
5. Canstar, “Home Loan Borrowing Power Calculator and Guide,” 2025. https://www.canstar.com.au