What borrowing capacity actually means
Borrowing capacity is the maximum loan amount a lender will offer you based on your income, expenses, debts, and deposit. It determines which properties you can afford to buy and sets the upper limit for your property search.
Most lenders use a similar formula, but the numbers can shift between lenders based on their assessment policies. Income gets multiplied, expenses get added up, debts get factored in, and the lender applies a buffer to make sure you can still afford repayments if the interest rate climbs. The result is a dollar figure that tells you what you can borrow.
How lenders assess your income
Your income sits at the centre of every borrowing capacity calculation. Lenders take your gross income before tax and apply what they call a net surplus ratio, which accounts for tax, living expenses, and other commitments. Full-time PAYG employees usually see their full base salary counted, while overtime, bonuses, and allowances might only be assessed at a percentage or ignored altogether if they are irregular.
Consider someone working in one of Ellenbrook's commercial precincts earning $85,000 per year as a base salary plus $8,000 in overtime. Most lenders would count the full $85,000 but might only include 50 to 80 percent of the overtime, depending on how consistently it appears across payslips. That difference alone can shift borrowing capacity by $30,000 to $40,000.
Self-employed income works differently. Lenders typically average your last two years of tax returns, and sometimes they add back certain deductions like depreciation. If your taxable income fluctuates, that average might not reflect your current earning power, which is where a broker can help present your income in the most accurate light.
The expenses lenders use in their calculation
Lenders do not just ask what you spend. They apply a benchmark figure called the Household Expenditure Measure, or HEM, which estimates what a household of your size should spend each month based on national data. If your actual living costs are lower than HEM, the lender still uses HEM. If your costs are higher, they use your actual figure.
On top of living expenses, lenders add your existing debts. Credit card limits get counted as though you have spent the full amount, even if your balance is zero. A $10,000 credit card limit might reduce your borrowing capacity by $50,000 or more, depending on the lender. Personal loans, car loans, and buy now pay later accounts all get factored in as monthly commitments.
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Property prices in Ellenbrook have grown steadily over recent years, with demand from families attracted to the area's newer estates, schools, and proximity to both Perth city and the Swan Valley. Buyers here often need every dollar of borrowing capacity they can access, which makes clearing small debts and closing unused credit accounts a practical step before applying for home loan pre-approval.
Interest rate buffers and serviceability tests
Lenders do not assess your loan repayments at the current variable rate. They add a buffer, usually between 2.5 and 3 percent, to test whether you could still afford repayments if rates went up. This is called the serviceability rate.
If the current variable rate sits around 6 percent, the lender might assess your loan at 8.5 or 9 percent. That higher rate produces a higher monthly repayment figure, which reduces the loan amount you can service. The buffer protects both you and the lender, but it also means that advertised low rates do not directly translate into higher borrowing capacity.
How deposit size affects what you can borrow
Your deposit does not change the amount a lender is willing to lend based on your income and expenses, but it does change the loan amount you need. A larger deposit means you borrow less, which keeps your repayments lower and your loan to value ratio under control.
If you are borrowing more than 80 percent of the property value, you will need to pay Lenders Mortgage Insurance, or LMI. That cost gets added to your loan or paid upfront, and it does not increase your borrowing capacity. It just means more of your capacity is used up covering the insurance premium rather than buying the property.
First home buyers in Western Australia can access schemes like the Home Guarantee Scheme, which allows you to borrow up to 95 percent of the property value without paying LMI. That keeps more of your borrowing capacity available for the actual purchase.
Calculating your own rough estimate
You can estimate your borrowing capacity by multiplying your gross annual income by a factor between five and six, then subtracting any large debts. A single person earning $90,000 with no debts might borrow somewhere between $450,000 and $540,000, depending on the lender and their living expenses.
That estimate gives you a starting point, but it does not account for interest rate buffers, HEM benchmarks, or lender-specific policies. Running your details through a borrowing capacity calculator or speaking with a broker gives you a more accurate figure before you start looking at properties in areas like The Bridges or Woodlake.
Why borrowing capacity varies between lenders
Two lenders can assess the same income and expenses and arrive at different borrowing capacities. One might be more generous with overtime or bonus income. Another might apply a lower interest rate buffer or use a different HEM figure. Some lenders reduce their assessment if you are borrowing for an investment loan rather than an owner-occupied purchase.
This is where comparing lenders becomes useful. A broker has access to borrowing capacity calculators for dozens of lenders and can identify which ones are likely to offer the highest pre-approval based on your specific circumstances. If you are self-employed, earn commission, or have irregular income, the difference between lenders can be significant.
What you can do to improve your borrowing capacity
Paying down debts has the most immediate impact. Closing a credit card with a $5,000 limit might increase your borrowing capacity by $25,000 or more. Paying off a car loan or personal loan removes that monthly commitment from the lender's calculation and frees up serviceability.
Increasing your income helps, but only if the increase is reflected in your payslips or tax returns for long enough that the lender considers it stable. A pay rise that happened last month might not be counted yet. A promotion that lifts your base salary and appears across three payslips will be.
Reducing your living expenses does not help unless your actual costs are higher than the HEM benchmark. If the lender is already using HEM, cutting your grocery bill will not change their assessment. Clearing debts and closing credit accounts will.
Call one of our team or book an appointment at a time that works for you. We will run your borrowing capacity across multiple lenders, explain where the differences come from, and help you work out which steps will make the most difference before you apply for a home loan.
Frequently Asked Questions
What is borrowing capacity?
Borrowing capacity is the maximum loan amount a lender will offer based on your income, expenses, debts, and deposit. It sets the upper limit for what you can afford to borrow when buying a property.
Why does borrowing capacity vary between lenders?
Different lenders use different assessment policies for income types, living expense benchmarks, and interest rate buffers. One lender might be more generous with overtime income or apply a lower serviceability rate, which changes the final borrowing capacity.
How can I increase my borrowing capacity?
Paying down debts and closing unused credit accounts has the most immediate impact. A single credit card with a $5,000 limit can reduce your borrowing capacity by $25,000 or more, so clearing those commitments frees up serviceability.
Do lenders assess my loan at the current interest rate?
No, lenders add a buffer of 2.5 to 3 percent above the current rate to test whether you could still afford repayments if rates increased. This serviceability test reduces the loan amount you can borrow compared to what the advertised rate might suggest.
Does a larger deposit increase my borrowing capacity?
A larger deposit does not increase the amount a lender is willing to lend based on your income and expenses, but it reduces the loan amount you need to borrow. It also helps you avoid Lenders Mortgage Insurance if your deposit is 20 percent or more.
