What lenders look at when calculating your borrowing capacity
Lenders calculate your borrowing capacity by assessing your income, existing debts, living expenses, and the interest rate buffer they must apply under APRA rules. Every ADI must assess your ability to service a home loan at an interest rate that is at least 3.0 percentage points above the loan product rate.
In Beeliar, where the family home market attracts a mix of first-time buyers and those upgrading from smaller properties, this buffer can reshape what you assumed you could borrow. A household earning $120,000 with minimal debt might expect to borrow around $650,000 to $700,000, but that figure shifts depending on how many dependents you have, whether you hold any credit card limits, and what your regular expenses look like. Lenders don't just look at what you spend today. They apply benchmark figures for categories like groceries, transport, and utilities, and if your declared expenses fall below those benchmarks, the lender will use the higher number.
This is why two households with identical incomes can receive different borrowing assessments. One might have a $15,000 credit card limit they rarely use. The lender will still assess repayments as if that limit is fully drawn. The other household has no cards and no car loan, so more of their income is available to service a mortgage. If you're planning to buy in one of Beeliar's newer estates near Beeliar Regional Park, where homes are often priced above the Perth median, understanding these details before you start looking will save you from disappointment later.
How the debt-to-income limit affects what you can borrow
From 1 February 2026, APRA activated a DTI lending limit requiring each ADI to lend no more than 20 per cent of new owner-occupier loans and 20 per cent of new investor loans to borrowers with a total DTI ratio of six times or greater. The measure applies to new lending only and does not affect existing borrowers.
For a household earning $150,000, a DTI of six times means total borrowing of $900,000. That includes your proposed mortgage and any other debt like personal loans or car finance. If you're looking at a home in Beeliar priced around $850,000 and you already have $60,000 in other debt, you're at the edge of that limit. Not every lender will approve you at that level, even if your serviceability passes. Some lenders exhaust their 20 per cent quota early in the quarter and stop lending to high-DTI borrowers until the next reporting period.
This is where working with a broker makes a material difference. We track which lenders have capacity within their DTI allocation and can place your application accordingly. It's not about finding a loophole. It's about timing and lender selection. One lender might decline you in March because they've hit their cap. Another might approve the same application in April because their quarterly allocation has reset. That's the kind of detail you won't find on a comparison website.
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Why your deposit size changes the amount you can borrow
Under APS 112, lenders apply specific risk weights to residential mortgage exposures based on the classification of the loan and its LVR. LMI applies to residential loans where the LVR exceeds 80 per cent. A larger deposit reduces the lender's risk, which can improve your borrowing capacity in some scenarios, though the effect is less direct than most buyers assume.
Consider a buyer looking at a $700,000 home in Beeliar with a 10 per cent deposit. They'll need to pay LMI, and the premium will be capitalised into the loan. That increases the loan amount and the monthly repayment, which in turn affects serviceability. If the same buyer saved a 20 per cent deposit, they'd avoid LMI entirely, borrow less, and have lower repayments. The borrowing capacity itself doesn't increase, but the net position is stronger.
Eligible first home buyers can purchase with a deposit of as little as 5% of the property value under the Australian Government 5% Deposit Scheme, with Housing Australia providing a guarantee to the participating lender of up to 15% of the property value. In Western Australia, property price caps are $850,000 in capital cities and regional centres and $600,000 in other areas. Beeliar falls within the Perth metropolitan cap of $850,000, so if you're a first home buyer targeting a property under that threshold, you can access the scheme and avoid LMI with a 5 per cent deposit. That frees up cash you might otherwise need for settlement costs or furniture.
Not every lender participates in the scheme, so your choice of lender will depend on whether you're using it. If your income is strong and you're comfortable saving a larger deposit, you'll have access to a wider panel of lenders and potentially lower rates. If your deposit is limited but your income is solid, the 5% Deposit Scheme is worth considering. We can walk through both options and show you the numbers side by side. You can read more about first home buyer options on our site.
How to improve your borrowing capacity before you apply
Reducing your committed monthly expenses is the most direct way to increase what a lender will approve. Close credit cards you don't use, even if the balance is zero. Pay down or consolidate personal loans and car finance. If you have a buy now, pay later account, close it. Lenders treat these as unsecured credit and will assess them as if they're being used at their limit.
In Beeliar, where buyers often commute to Murdoch, Cockburn, or Fremantle for work, it's common to have a car loan or two. If you're six months out from applying for a mortgage, consider whether you can clear that debt or reduce it significantly. A $30,000 car loan with $700 monthly repayments will reduce your borrowing capacity by around $150,000, depending on your lender's assessment rate. That's the difference between a three-bedroom home and a four-bedroom home in some parts of the suburb.
Your income also matters, but it's harder to change in the short term. If you're self-employed, lenders will typically average your last two years of taxable income. If you've had a strong year but a weaker year before that, the average might not reflect your current position. Some lenders will accept a single year of financials if your accountant provides a letter confirming ongoing trading conditions, but not all will. If you're salaried and you've recently received a pay rise, make sure your payslips reflect that increase before you lodge your application. Lenders assess based on evidence, not projections.
A loan health check can show you where your current position sits and what changes would make the most difference. It's not about perfection. It's about understanding which levers you can pull and which ones are worth the effort.
When to lock in pre-approval and what it actually covers
Pre-approval, also called conditional approval, is not a guarantee of final approval. It confirms that based on the information you've provided and the documents you've submitted, a lender is willing in principle to lend you a specified amount. Final approval is subject to a satisfactory valuation, clear title, and no material change in your circumstances.
Pre-approval is useful when you're ready to make an offer but haven't found the right property yet. In Beeliar, where established homes near the lake or newer builds in the northern parts of the suburb can move quickly, having pre-approval gives you confidence to act when the right property comes up. Most lenders will hold pre-approval for three to six months, depending on the lender and the loan product.
If your circumstances change during that period, you need to tell the lender. If you change jobs, take on new debt, or reduce your income, the pre-approval may no longer be valid. We've seen buyers assume that pre-approval is locked in and then be surprised when the lender reassesses at settlement. It's not a trick. It's a condition of the approval. If nothing changes, the approval proceeds. If something material changes, the lender will review it.
Pre-approval also doesn't lock in your interest rate. Rates are confirmed at settlement, not at pre-approval. If rates move between the time you get pre-approval and the time you settle, your repayments will reflect the new rate. You can read more about home loan options and how rate types work on our site.
How investment income and rental properties affect your borrowing capacity
If you already own an investment property, lenders will assess the rental income you receive and the loan repayments you're making. Most lenders will only recognise 80 per cent of the rental income to account for vacancy and maintenance costs. If your investment property generates $500 per week in rent, the lender will assess $400 per week as usable income. The mortgage repayment on that property is assessed at the full loan amount plus the 3.0 percentage point buffer, just like your new home loan.
In Beeliar, where some buyers are purchasing their second property and keeping their first home as an investment, this calculation becomes important. If you're upgrading from a $500,000 unit to a $750,000 house, the lender will assess both loans. The unit might be neutrally geared or slightly positive on paper, but once the lender applies the buffer and the 80 per cent income rule, it often looks negatively geared for serviceability purposes. That reduces what you can borrow for the new property.
From the 2027-28 income year, losses related to residential investment properties purchased after 7:30pm AEST on 12 May 2026 are deductible only against other income from residential properties, including capital gains. Losses from residential investment properties held at 7:30pm AEST on 12 May 2026 continue to be deductible against other income, including salary and wages. This change doesn't directly affect borrowing capacity calculations, but it does affect the after-tax cash flow of any investment property you buy from now on. If you're planning to build a portfolio and you're relying on negative gearing to reduce your taxable income, the new rules mean that strategy only works if you also have other property income to offset. That might influence whether you prioritise paying down your owner-occupied loan or keeping debt in place to invest. You can read more about investment loan structures on our site.
Call one of our team or book an appointment at a time that works for you. We'll walk through your full financial position, show you what you can borrow, and help you structure your application so it reflects your circumstances accurately and fairly.
Frequently Asked Questions
What is the serviceability buffer and how does it affect what I can borrow?
The serviceability buffer requires lenders to assess your ability to repay a home loan at an interest rate that is at least 3.0 percentage points above the actual loan rate. This ensures you can still afford repayments if rates rise. The buffer reduces the amount you can borrow compared to an assessment at the loan rate alone.
Does closing a credit card I don't use increase my borrowing capacity?
Yes, lenders assess credit card limits as if they are fully drawn, even if your balance is zero. Closing unused cards removes that liability from the lender's calculation, which can increase the amount you're able to borrow. This applies to all forms of unsecured credit, including buy now, pay later accounts.
Can I use the 5% Deposit Scheme to buy a home in Beeliar?
Yes, if you're a first home buyer and the property is priced under $850,000, you can use the Australian Government 5% Deposit Scheme. Housing Australia provides a guarantee to the lender, allowing you to avoid paying lenders mortgage insurance with a deposit as low as 5 per cent.
How does owning an investment property affect my borrowing capacity for a new home?
Lenders will assess 80 per cent of your rental income and deduct the full mortgage repayment on your investment property, assessed at a buffered rate. This often reduces the amount you can borrow for your new home, even if the investment property is positively geared on paper.
What does pre-approval actually cover?
Pre-approval confirms that a lender is willing in principle to lend you a specified amount based on the information and documents you've provided. It is subject to a satisfactory valuation, clear title, and no material change in your financial circumstances. It does not lock in your interest rate.