How much you can borrow for a home loan in Perth depends on your income, living expenses, existing debts and a mandatory stress test set by the regulator, APRA.
In 2026, lenders must check you could still afford repayments if your interest rate rose by three percentage points. With variable rates around 6.5%, that means being assessed at roughly 9.5%.
That is why borrowing power is often tighter than buyers expect – and why the lender you choose matters so much.
Borrowing power is really a serviceability test: can you comfortably meet repayments after the lender adds its safety buffer? They take your gross income, subtract living expenses, existing loan repayments and credit-card limits, then apply the 3% buffer.
That buffer reduces most borrowers’ capacity by around 20% to 25% compared with the actual rate. It is a deliberate cushion, designed so you are not stretched if rates rise again.
Lenders also treat income types differently. Base salary counts in full, but casual income, overtime, bonuses and rent may be shaded or need a track record, which is why presenting your income correctly can change the result.
Because every lender uses its own expense benchmarks and assessment policies, the same applicant can be offered far more at one lender than another.
As your local Perth broker, we know which lenders are most generous for your profile, and match you to the one likely to lend you the most – safely and within your comfort zone.
Small changes can make a big difference. Reducing or closing a credit card, clearing a car loan, or choosing a longer loan term can all lift your borrowing power noticeably.
If you are still saving, see how your deposit changes the picture in our guide on how much deposit you need for a house in WA.
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Lenders take your assessable income, deduct a realistic figure for living expenses (often the Household Expenditure Measure), then deduct repayments on existing debts to find your monthly surplus.
They then test whether that surplus covers the new loan’s repayments at your rate plus the 3% buffer. Interest-only loans are tested even harder, at the higher principal-and-interest repayment that applies once the interest-only period ends.
Good to know: the regulator also limits how much banks can lend above six times your income, so very high borrowing relative to income is capped. Estimate your position first with our borrowing power calculator.
No two lenders assess you the same way. Some count all of your overtime or rental income, others only 80%. Some use lower living-expense benchmarks, and a few have more generous policies for professionals or the self-employed.
That is why relying on a single bank can quietly cost you – you only ever see one answer, and it may not be the best one.
A broker compares dozens of lenders quickly and finds the policy that genuinely suits your situation. Explore your options on our home loan broker Perth page.
The fastest ways to lift your borrowing power are usually to reduce your commitments and present your income clearly.
We review your full position, suggest practical changes, then match you to the lender most likely to approve the amount you need for your Perth home.
Timing matters too. Applying just after a pay rise, or once a loan is cleared, can lift your capacity, while a recent large purchase on a credit card can quietly reduce it right when you need it most.
Once your position is optimised, we arrange pre-approval so you can shop with confidence. For the full journey, read our complete home loan guide for Perth buyers, or browse our finance services.
Book a free, no-obligation chat and we will calculate your real borrowing power across 40-plus lenders.
Source: borrowing and serviceability guidance from ASIC MoneySmart, and the serviceability buffer from APRA. Figures are current at the time of writing – confirm before you apply.
