Your borrowing capacity determines how much a lender will approve for your home loan application. It's calculated using your income, existing debts, living expenses, and the loan structure you choose, with each lender applying slightly different assessment criteria.
How Lenders Calculate What You Can Borrow
Lenders assess your borrowing capacity by comparing your net income against your financial commitments and estimated living expenses, then applying a buffer to ensure you can still afford repayments if interest rates rise. Most lenders add a serviceability buffer of around 3% above the current interest rate when running their calculations. Your gross income forms the starting point, then lenders deduct tax, existing debt repayments, credit card limits (even if you pay them off monthly), and a household expenditure measure based on your family size and spending patterns. The amount left over determines what you can service in monthly loan repayments.
The calculation becomes more specific when you factor in different loan structures. A principal and interest loan will show a higher monthly repayment than an interest only loan for the same amount, which means your borrowing capacity appears lower on a principal and interest basis. Some buyers in Coomera who are upgrading from a townhouse to a house with land have found their capacity stretched when moving from an investor product to an owner occupied home loan, as the latter is assessed more conservatively.
Debt Commitments That Reduce Your Capacity
Credit card limits reduce your borrowing capacity by the full limit amount, not just what you owe. A credit card with a $10,000 limit might be treated as though you're making minimum monthly repayments on the full balance, which could reduce your borrowing capacity by $50,000 to $80,000 depending on the lender. Personal loans, car loans, and Buy Now Pay Later accounts all work similarly. Even if you only owe $2,000 on a personal loan, the lender factors in the monthly repayment for the life of that loan when calculating what you can afford.
Consider a buyer who wanted to purchase near Coomera Town Centre and had a $15,000 car loan with two years remaining, plus two credit cards with combined limits of $18,000 that were rarely used. Their income supported a loan amount of around $520,000, but after factoring in the car loan and credit card limits, their capacity dropped to $420,000. They paid out the car loan early and closed one credit card completely, which brought their capacity back up to $485,000. That adjustment made the difference between qualifying for a three-bedroom townhouse and a four-bedroom house in the same precinct.
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Living Expenses and the Household Expenditure Measure
Lenders use either your declared living expenses or a benchmark figure called the Household Expenditure Measure (HEM), whichever is higher. The HEM is based on Australian Bureau of Statistics data and varies by family size and location. For a couple with one child, the HEM might sit around $2,800 to $3,200 per month depending on the lender. If your actual spending is lower, the lender will still use the HEM figure. If your spending is higher, they'll use your actual figure, which reduces what you can borrow.
Declaring accurate living expenses matters, but inflating them to appear conservative can backfire. Your bank statements often form part of the home loan application process, and if your declared expenses don't align with your transaction history, the lender may question the accuracy of your application or apply a higher discretionary spend figure.
How Loan Structures Affect Your Borrowing Power
A split loan arrangement can sometimes improve your serviceability compared to a full fixed rate, particularly when fixed interest rates sit higher than variable rates. The portion on a variable rate is assessed at the actual rate plus the buffer, while the fixed portion is assessed at the fixed rate plus the buffer. If variable rates are lower, splitting your loan might show a lower blended repayment in the serviceability calculation, which increases the amount you can borrow.
Using an offset account instead of making extra repayments doesn't change your borrowing capacity for the initial loan, but it does help you build equity faster once the loan is active, which improves your position for future refinancing or purchasing an investment property. Some buyers in growth areas like Coomera use this approach to maintain flexibility while preparing for their next purchase within a few years.
Income Types and How They're Assessed
Base salary is assessed at 100% of its value, but overtime, bonuses, and commission income are typically assessed at a lower percentage depending on how long you've been receiving them. If you've had consistent overtime for two years, a lender might assess 80% to 100% of that income. If it's only been six months, they might assess 50% or exclude it entirely. Rental income from an investment property is usually assessed at 75% to 80% of the gross rent to account for vacancy periods and maintenance costs.
Self-employed income and income for business owners is assessed using tax returns, often averaging the last two years of net profit plus any add-backs like depreciation. This can make borrowing capacity more complex for buyers who minimise their taxable income for tax purposes, as the lender only sees the declared net profit. If you're self-employed and planning to apply for a home loan in the next 12 to 24 months, it's worth speaking to a mortgage broker in Coomera before lodging your next tax return to understand how your structure will be assessed.
Increasing Your Borrowing Capacity Before You Apply
Paying down existing debts has the most immediate impact on your borrowing capacity. Closing unused credit cards, paying out small personal loans, and consolidating Buy Now Pay Later accounts can increase your capacity by tens of thousands of dollars within a few weeks. Increasing your income is effective but takes longer unless you're able to negotiate a pay rise or take on consistent overtime that a lender will recognise.
Reducing your living expenses on paper only works if your actual spending aligns with what you declare, as lenders will compare your bank statements to your declared figures during the assessment. Choosing a longer loan term will increase your borrowing capacity because the monthly repayment is lower, but it also means you'll pay more in interest over the life of the loan. Some buyers in Coomera who are purchasing near Westfield Coomera or along the newer estates off Foxwell Road have used a 30-year term to maximise their borrowing capacity, then made additional repayments once settled to reduce the loan term without being locked into a higher mandatory repayment.
If you're planning to apply for a home loan pre-approval in Coomera, understanding your borrowing capacity before you start looking at properties will help you focus on the right price range and avoid the frustration of finding a property you can't finance. A mortgage broker can run a capacity assessment across multiple lenders to identify which one offers the highest borrowing power based on your specific circumstances, as the difference between lenders can be significant depending on how they assess your income type, debts, and expenses.
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Frequently Asked Questions
What is borrowing capacity and how is it calculated?
Borrowing capacity is the maximum amount a lender will approve for your home loan. It's calculated by comparing your net income against your debts, living expenses, and applying a buffer to ensure you can afford repayments if rates rise.
Why do credit card limits reduce my borrowing capacity even if I pay them off each month?
Lenders assess credit cards based on the full limit, not the balance you carry. They assume you could draw the full amount at any time, so a $10,000 limit might reduce your borrowing capacity by $50,000 to $80,000.
How does being self-employed affect my borrowing capacity?
Self-employed borrowers are assessed using tax returns, typically averaging the last two years of net profit plus add-backs like depreciation. If you minimise taxable income for tax purposes, it can reduce the amount lenders see as available income.
What is the Household Expenditure Measure and how does it affect my loan application?
The Household Expenditure Measure (HEM) is a benchmark figure lenders use for living expenses based on family size and location. Lenders use either your declared expenses or the HEM, whichever is higher, when calculating your borrowing capacity.
Can I increase my borrowing capacity before applying for a home loan?
Yes, paying down existing debts, closing unused credit cards, and consolidating Buy Now Pay Later accounts can increase your capacity significantly. Increasing your income or choosing a longer loan term can also help, though the latter increases total interest paid.
