How Much Can You Borrow for a Home Loan in Australia: A Complete Guide to Borrowing Power

Understanding how much you can borrow for a home loan is the crucial first step in your property journey. Australian lenders use sophisticated calculations to determine your borrowing power, which goes far beyond a simple income multiplier. In this comprehensive guide, we’ll break down exactly how banks and mortgage providers assess your capacity to repay, the key factors that influence your maximum loan amount, and actionable strategies to boost your borrowing potential. Whether you’re a first-home buyer or looking to upgrade, mastering these concepts will put you in a stronger position when applying for a mortgage.


What Is Borrowing Power and Why Does It Matter?

Borrowing power, also known as borrowing capacity, refers to the maximum amount a lender is willing to offer you based on your financial situation. It’s not a fixed number but a dynamic calculation that reflects your income, expenses, existing debts, and the lender’s own risk appetite. In 2025, with interest rates and living costs fluctuating, understanding your borrowing power is more important than ever.

The Role of Lenders Mortgage Insurance (LMI)

If you have a deposit of less than 20% of the property’s value, you’ll typically need to pay Lenders Mortgage Insurance (LMI). This one-off premium protects the lender if you default, but it also affects your borrowing power because the cost is often added to your loan amount. LMI thresholds and premiums vary by lender and loan-to-value ratio (LVR).

How Borrowing Power Differs from Loan Pre-Approval

A loan pre-approval is a conditional offer from a lender stating how much they might lend you, based on a preliminary assessment. Your actual borrowing power is the final amount approved after full verification of your finances. The two can differ due to changes in your circumstances or lender policies.

Key Factors That Determine Your Borrowing Capacity

Australian lenders assess your borrowing power using a combination of your income, expenses, debts, and credit history. Let’s examine each factor in detail.

1. Income Assessment

Lenders consider all stable income sources, including:

• Base salary or wages: Full-time, part-time, or casual employment income.
• Rental income: From investment properties, usually shaded to 75-80% to allow for vacancies and costs.
• Self-employed income: Typically averaged over two years’ tax returns, with add-backs like depreciation.
• Other income: Such as bonuses, commissions, dividends, and government benefits (e.g., Family Tax Benefit).

Lenders apply shading (discounts) to variable income to reflect risk. For example, bonuses might be included at 50-80% of their actual value.

2. Expenses and Living Costs

Since the introduction of comprehensive credit reporting and the Banking Royal Commission, lenders scrutinize your living expenses more rigorously. They use one of two methods:

• Household Expenditure Measure (HEM): A benchmark based on the ABS Household Expenditure Survey, adjusted for household size and income. In 2025, HEM remains a baseline, but lenders also consider your declared expenses.
• Declared expenses: You must provide a detailed breakdown of spending on groceries, utilities, transport, childcare, insurance, and discretionary items. Lenders take the higher of HEM or your declared expenses.

Any recurring commitments like private school fees, gym memberships, or streaming services are included.

3. Existing Debts and Liabilities

All current debts reduce your borrowing power because they compete for your income. These include:

• Credit cards: Lenders assess the full credit limit, not just the balance, as a potential liability.
• Personal loans, car loans, and student loans (HELP/HECS).
• Buy now, pay later (BNPL) accounts: Afterpay, Zip Pay, etc., are treated as ongoing expenses.
• Existing mortgages or investment property loans.

Lenders use a debt-to-income ratio (DTI) to gauge risk. Most lenders prefer a DTI below 6-7 times your gross income, though some may lend up to 9 times for high-income borrowers.

4. Credit Score and History

Your credit score, ranging from 0 to 1200, reflects your creditworthiness. In 2025, scores are categorized as:

• Excellent: 833–1200
• Very good: 726–832
• Good: 622–725
• Average: 510–621
• Below average: 0–509

A higher score can improve your borrowing power and help you secure better interest rates. Lenders also review your credit report for defaults, late payments, and numerous credit inquiries.

5. Interest Rate Buffers

Lenders don’t assess your repayments at the current interest rate. They add a buffer, typically 3% above the loan’s actual rate, to ensure you can afford repayments if rates rise. For example, if your loan rate is 6.00%, the assessment rate might be 9.00%. This buffer significantly reduces your maximum borrowing amount.

6. Loan Type and Term

• Owner-occupied vs. investment: Investment loans may allow higher borrowing due to tax-deductible interest and rental income, but lenders still assess overall affordability.
• Fixed vs. variable: Fixed-rate loans offer certainty but may have lower borrowing power if the fixed rate is higher than the variable assessment rate.
• Loan term: A longer term (e.g., 30 years) reduces monthly repayments and can increase borrowing power, but you’ll pay more interest over time.

How Lenders Calculate Your Maximum Loan Amount

While each lender has proprietary algorithms, the basic formula is:

Net Surplus = (Assessable Income – Tax – Living Expenses – Existing Commitments – New Loan Repayments at Assessment Rate)

Lenders require a minimum surplus, often around $200–$500 per month, after all commitments. They then back-calculate the maximum loan amount that fits within this surplus.

Example Calculation

Let’s consider a couple with a combined gross income of $150,000 p.a., living expenses of $3,500/month, a car loan repayment of $400/month, and a credit card with a $10,000 limit. Assuming a 30-year loan at 6.00% with a 3% buffer:

• Monthly gross income: $12,500
• Tax (approx. 25% average): $3,125
• Net income: $9,375
• Living expenses (higher of HEM or declared): $3,500
• Car loan: $400
• Credit card minimum (3% of limit): $300
• Surplus before new loan: $5,175
• New loan repayment at 9.00% assessment rate: The lender calculates that a loan of approximately $620,000 would have monthly repayments of about $4,990, leaving a surplus of $185.

Thus, their maximum borrowing power is around $620,000. This is a simplified example; actual results vary by lender.

Comparison of Lender Assessment Criteria

Practical Tips to Improve Your Borrowing Power

Boosting your borrowing capacity doesn’t always require earning more. Strategic financial adjustments can make a significant difference.

1. Reduce or Eliminate Debts

Pay off credit cards and close unused accounts. Lowering your credit limit from $15,000 to $5,000 can increase your borrowing power by tens of thousands. Consolidate personal loans if possible.

2. Cut Discretionary Spending

Lenders review bank statements from the last 3–6 months. Reduce dining out, subscriptions, and impulse purchases for at least three months before applying. A leaner spending pattern can increase your surplus.

3. Increase Your Income

A pay rise, second job, or rental income can directly boost your borrowing power. Even a modest increase of $5,000 p.a. can add $20,000–$30,000 to your loan amount.

4. Improve Your Credit Score

Check your credit report for errors and pay all bills on time. Avoid multiple credit applications in a short period, as each inquiry can lower your score.

5. Choose the Right Lender

Different lenders have varying policies on income shading, living expenses, and buffers. A mortgage broker can help you find a lender that maximizes your borrowing power based on your unique situation.

6. Extend Your Loan Term

Opting for a 30-year term instead of 25 years reduces monthly repayments, increasing your borrowing capacity. However, consider the long-term interest cost.

Common Mistakes That Reduce Your Borrowing Power

Avoid these pitfalls to keep your borrowing capacity as high as possible.

1. Underestimating Living Expenses

Lenders compare your declared expenses against HEM. If your declared expenses are lower than HEM, they’ll use HEM anyway. Be realistic but mindful of unnecessary spending.

2. Applying with Multiple Lenders Simultaneously

Each application triggers a credit inquiry, which can lower your credit score. Use a broker to compare lenders without multiple hits.

3. Changing Jobs Before Applying

Lenders prefer stable employment. A recent job change, especially if you’re on probation, can reduce your borrowing power or delay approval.

4. Ignoring Buy Now, Pay Later Accounts

Even small BNPL facilities are treated as ongoing expenses. Close them before applying.

5. Not Factoring in Interest Rate Rises

Borrowing at your maximum capacity leaves no buffer for rate hikes. Always stress-test your budget against a 2–3% increase.

The Impact of Government Schemes and Grants

Several government initiatives can indirectly boost your borrowing power by reducing the required deposit or providing ongoing benefits.

• First Home Guarantee: Allows eligible buyers to purchase with a 5% deposit without LMI, effectively increasing purchasing power.
• Family Home Guarantee: For single parents with a 2% deposit.
• Stamp duty concessions: Vary by state and can free up cash for a larger deposit.
• First Home Super Saver Scheme (FHSSS): Lets you save for a deposit within your superannuation, potentially boosting your savings faster.

While these don’t directly increase your borrowing capacity, they improve your overall financial position, allowing you to consider properties that might otherwise be out of reach.

How to Get an Accurate Borrowing Power Estimate

Online calculators provide a rough guide, but for a precise figure, you should:

1. Gather financial documents: Pay slips, tax returns, bank statements, and debt statements.
2. Consult a mortgage broker: Brokers have access to multiple lenders and can run scenarios tailored to your profile.
3. Obtain a pre-approval: This gives you a conditional commitment from a lender, subject to property valuation and final checks.

Remember, borrowing power is not the same as what you should borrow. Always consider your lifestyle and future goals when deciding on a loan amount.

FAQ

How much can I borrow if I earn $100,000 per year?

Your borrowing power depends on your expenses, debts, and the lender’s criteria. As a rough guide, a single person earning $100,000 with minimal debts and average living costs might borrow between $400,000 and $550,000. Use a borrowing power calculator or speak to a broker for a personalized estimate.

Does a higher credit score increase my borrowing power?

A higher credit score doesn’t directly increase the amount you can borrow, but it can help you qualify for lower interest rates and better loan products. This, in turn, can improve your borrowing capacity because lower rates mean lower assessed repayments.

Can I borrow more if I have a guarantor?

Yes, a guarantor loan allows a family member to use their property as security, potentially enabling you to borrow up to 100% of the purchase price without LMI. This can significantly increase your borrowing power, but the guarantor takes on substantial risk.

How do lenders treat casual or gig economy income?

Lenders typically require a history of casual or gig income, often 6–12 months, and may average it over that period. They may shade it by 20–30% to account for variability. Consistent earnings improve your chances.

What is the maximum debt-to-income ratio for a home loan?

Most Australian lenders cap the debt-to-income ratio at 6–7 times your gross income, but some may go up to 9 times for high-income professionals. A lower DTI generally means better borrowing terms.

References

1. Australian Securities and Investments Commission (ASIC) – Moneysmart: “How much can I borrow?” (2025). https://moneysmart.gov.au/home-loans/how-much-can-i-borrow
2. Australian Prudential Regulation Authority (APRA) – “Prudential Practice Guide APG 223: Residential Mortgage Lending” (2024). https://www.apra.gov.au/sites/default/files/2024-12/APG%20223%20Residential%20mortgage%20lending.pdf
3. Reserve Bank of Australia – “Household Debt and the Housing Market” (2023). https://www.rba.gov.au/publications/bulletin/2023/dec/household-debt-and-the-housing-market.html
4. Equifax Australia – “Credit Score Ranges and What They Mean” (2025). https://www.equifax.com.au/credit-score/credit-score-ranges
5. National Housing Finance and Investment Corporation (NHFIC) – “First Home Loan Deposit Scheme Trends” (2024). https://www.nhfic.gov.au/research/first-home-buyer-trends-2024/