It’s the first question almost every buyer asks, and it’s also the one that gets the murkiest answers. An online estimate says one thing, your bank says another, and the property you actually want sits somewhere in between. So let’s cut through it. Here’s what genuinely drives your borrowing power in Perth in 2026, the numbers lenders are working with today, and the levers that can move your maximum loan up or down by tens of thousands of dollars.
The two numbers that shape everything
Two figures sit behind almost every lending decision right now: the cash rate and the assessment rate.
In June 2026 the Reserve Bank held the official cash rate at 4.35%, after three increases earlier in the year (February, March and May). For borrowers, that flows through to a typical new owner-occupier variable rate of around 6.25% p.a., though the exact figure varies by lender, loan size and deposit.
Here’s the part that surprises people: the bank doesn’t assess you at 6.25%. Under rules set by the prudential regulator, APRA, lenders must add a serviceability buffer of 3 percentage points on top of your actual rate. So if your real rate is around 6.25%, you’re being tested on whether you could afford repayments at roughly 9.25%. That buffer exists to make sure you can still cope if rates climb, and it’s the single biggest reason your approved loan is smaller than your “I can easily afford this” budget. In practice the buffer trims borrowing capacity by somewhere between 15% and 20% for most applicants.
That’s not the bank being difficult. It’s a national rule that applies almost everywhere, and a borrowing power calculator that bakes the buffer in will give you a far more realistic starting figure than one that doesn’t.
A realistic worked example
Take a single applicant earning $120,000 a year, with no car loan, no big credit card limits and no dependants. Assessed at roughly 9.25%, using standard living-cost estimates, that person might be looking at a maximum loan somewhere in the region of $550,000 to $620,000, depending on the lender. Add a partner’s income, and a dual-income couple on a combined $180,000 with clean finances can often push past $800,000.
Those are illustrative ranges, not promises. Every lender runs slightly different policy, and small differences in your situation can swing the result by $50,000 or more. But they show why the honest answer to “how much can I borrow?” is always “it depends on the detail” rather than a single tidy number.
What that buys you in Perth
Borrowing capacity only matters relative to prices, and Perth has moved fast. The median dwelling value sits at roughly $1.05 million in mid-2026, with houses closer to $1.09 million and units nearer $760,000. The city has led the country for annual growth, listings remain well below normal, and well-priced homes are still selling in a matter of days.
What that means in practice is that the deposit gap, not just the loan size, is doing a lot of the work. If a typical house is over a million dollars and your borrowing capacity is $600,000, the difference has to come from savings, equity or a smaller property type. That’s why units, townhouses and outer growth corridors have drawn so much demand: they keep the total purchase price within reach of a realistic loan. It’s also why getting your borrowing number right before you start inspecting matters so much. There’s little point falling in love with a price bracket your finance can’t reach.
The levers that move your number
Your income is the headline figure, but several other factors quietly raise or lower your ceiling:
Existing debts. A car loan, a personal loan or a buy-now-pay-later balance all reduce serviceability. Even unused credit card limits count against you, because lenders assess the full limit as if it were drawn. Closing or reducing cards before you apply is one of the fastest ways to lift your number.
Living expenses. Lenders apply a benchmark estimate of household running costs, and if your declared spending is higher, they’ll use the higher figure. Tidying up discretionary spending in the months before applying genuinely helps.
The debt-to-income cap. From February 2026, APRA limited how much lending banks can write at six times income or more. Most lenders now treat roughly 6x gross income as a practical ceiling, so on a $120,000 income that’s an effective cap around $720,000 regardless of what the serviceability sums alone might allow. This bites hardest on investors and high-leverage buyers.
Your deposit. A larger deposit lowers your loan-to-value ratio, can remove lenders mortgage insurance and often unlocks a sharper interest rate, which in turn improves serviceability. If your deposit is on the smaller side, low deposit home loans and guarantor structures can bridge the gap without waiting years to save more.
Your situation changes the rules
Borrowing capacity isn’t one-size-fits-all, and the right lender depends heavily on who you are.
If you’re buying your first place, there are grants, concessions and lower-deposit pathways that can meaningfully change the maths. It’s worth understanding what’s available to first home buyers in WA before assuming you need a 20% deposit, and for eligible buyers, Keystart home loans can allow entry with a much smaller deposit and no lenders mortgage insurance.
If you’re self-employed, the challenge usually isn’t affordability, it’s proving income in a way lenders accept. Tax returns, add-backs and how recently you’ve been trading all matter. A specialist approach to self-employed home loans can present your income in its strongest light rather than leaving money on the table.
And if you work fly-in fly-out, your income often looks unusual on paper: high base, allowances, rosters that don’t fit a neat template. Lenders vary enormously in how they treat it, which is exactly why FIFO worker home loans benefit from matching you to a lender that understands the income structure.
Already a homeowner? Your number may have changed
If you bought a few years ago, two things have probably shifted. Your equity has likely grown with Perth’s price gains, which can fund an upgrade, a renovation or an investment. But the rate environment has also moved, and the loan you’re sitting on may no longer be competitive. Reviewing whether to refinance can either reduce your repayments or, by lowering your rate, modestly lift how much you can borrow for your next move. It’s one of the few levers that works in both directions.
Don’t forget the costs around the loan
Your borrowing capacity covers the property, but a purchase comes with extra costs that need to sit on top of your deposit, transfer duty, settlement and lender fees among them. In WA these can add up quickly, and running the numbers through a stamp duty calculator early helps you avoid a nasty surprise at the pointy end. First home buyers may pay reduced or no duty depending on the price, which can free up thousands for your deposit.
How to lift your borrowing power before you apply
A few practical moves, in rough order of impact: reduce or close credit cards and personal loans, hold off on financing a new car until after settlement, trim recurring subscriptions and discretionary spending for three to six months, make sure your income is documented cleanly, and compare lenders rather than walking into your existing bank. Two lenders can assess the identical applicant and arrive at numbers $100,000 apart, purely because their policies differ. That gap is where a broker earns their keep.
Talk to someone who knows the Perth market
Online calculators are a useful starting point, but they can’t see the whole picture, your income structure, your goals, or which of the dozens of lenders will treat your situation most generously. That’s the part worth getting right before you make an offer.
Book a free, no-obligation chat with Central Lending Solutions and get a clear, realistic borrowing figure based on your actual circumstances, not a generic estimate. With access to a wide panel of lenders and no fee for our service, we’ll help you find the number that’s genuinely yours, and the loan that fits it.
Frequently Asked Questions
How much deposit do I actually need to buy in Perth right now?
The traditional benchmark is 20% of the purchase price, which avoids lenders mortgage insurance. But many buyers get in with far less. 5% to 10% is common through low-deposit and guarantor options, and some eligible buyers use Keystart with an even smaller deposit. The trade-off with a smaller deposit is usually a higher loan-to-value ratio and, in some cases, mortgage insurance, so it’s worth weighing the cost of waiting to save against the cost of buying sooner in a rising market.
Why does the bank say I can borrow less than I can clearly afford?
Because lenders are required to assess you at your interest rate plus a 3 percentage point buffer, not your actual rate. With rates around 6.25%, that means being tested near 9.25%. The buffer is designed to protect you if rates rise, and it typically reduces borrowing capacity by 15, 20%.
Will my borrowing power go up if the RBA cuts rates?
Generally yes. Lower actual rates mean a lower assessment rate, which improves serviceability. As a rough guide, each 0.5% reduction can add somewhere around $15,000, $25,000 to borrowing capacity for a typical applicant. That said, the RBA held the cash rate at 4.35% in June 2026 and the outlook is mixed, so it’s wise to plan around today’s numbers rather than a hoped-for cut.
Do my credit cards really affect how much I can borrow?
Yes, more than most people expect. Lenders count the full credit limit as a potential debt, even if your balance is zero. A $15,000 limit you never use can still shrink your borrowing power by a meaningful amount, so reducing limits or closing unused cards before applying is one of the simplest ways to improve your position.
How accurate are online borrowing calculators?
They’re a helpful first estimate, but they can’t account for lender-specific policy, how your income is structured, or the debt-to-income cap. Two lenders can assess the same person and reach very different figures. Treat a calculator as a ballpark, then get a tailored assessment before you start making offers.
This article is general information only and doesn’t take into account your personal circumstances. Lending criteria, rates and policies change and vary between lenders. Speak to a qualified mortgage broker before making finance decisions.
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We’re Here to Help
Contact our team if you have questions about home loans, refinancing, or other lending options. Call us, book a time to speak, or send us an email and we will get back to you.
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info@centrallendingsolutions.com.au
Central Lending Solutions is a Perth-based mortgage brokerage with over 20 years of experience in the finance industry. Our team helps clients compare lenders and navigate the home loan process from enquiry through to approval.
