Why Lenders Give Different Borrowing Limits in Perth, WA, What Actually Changes Your Number
You've done the online calculator. You've spoken to your bank. The number came back, and it felt lower than you expected. Then a colleague mentions they borrowed significantly more on a similar income, through a different lender. So which figure is right?
The answer is both of them. Lenders use the same regulatory framework but apply their own internal policy at almost every step of the assessment. Two lenders reading the same payslips, the same bank statements and the same credit file can reach figures $80,000 or $100,000 apart, and neither is making a mistake. They are just running different rules.
Our team works through this every week, comparing assessments across our panel to find the lender whose policy fits the borrower's income shape. The home loan structure that works hardest for you usually depends on which lender reads your situation most favourably, and that is not something a single bank quote can tell you.
Key takeaways
- Lenders use the same APRA buffer but apply different internal expense benchmarks.
- How a lender treats overtime, bonuses and credit card limits changes your number significantly.
- Comparing across lenders, not just rates, is the real reason to use a broker.
Why do lenders give different borrowing limits in Perth, WA?
Lenders give different borrowing limits because every lender sets its own internal credit policy on top of the national rules. The APRA serviceability buffer, a 3.0 percentage point safety margin added to your actual loan rate when assessing your application, is fixed and identical across all authorised lenders. But the inputs going into that calculation vary enormously: how much of your overtime counts, what living expenses the lender assumes you have, how your credit card limits are treated, and how your income is averaged.
Those variables, not the buffer itself, are what move the final figure. A lender that takes your overtime in full, assumes lower household expenses and discounts your unused credit card limits will approve a materially larger loan than one that shades your overtime, uses a higher expense benchmark and counts every card at its limit.
Source: APRA.
How does the serviceability assessment actually work?
Every lender assesses whether you can afford the loan at the actual rate plus the 3.0% APRA buffer. That assessment rate is applied to every dollar of your proposed borrowing, plus every existing commitment you carry. The lender then runs your income against your assessed commitments and a floor for living expenses, and the difference between income and outgoings determines how much you can borrow.
The regulation fixes the buffer. Everything else is lender discretion.
The question I ask every client is: which lender's policy fits your income shape? The answer is rarely the one they already use for their everyday banking, and most people don't know there's a difference until they've already applied.
Joe Del Borrello · Director, Launch Finance · Chat to the Launch team →
What specific policies cause lenders to assess income differently?
This is where the real variation lives. The income figure a lender uses is almost never your gross salary, because most borrowers earn at least some of their income in a form that lenders treat with caution.
The income types that create the widest variation:
- › Overtime and shift penalties: some lenders count consistent overtime in full once you have the history; others shade it, typically to somewhere between 80% and 100% of the average. That single policy difference, on a borrower earning $20,000 a year in overtime, can move the borrowing limit by tens of thousands of dollars.
- › Bonuses and commission: most lenders want one to two years of history before counting these, and even then typically average the income rather than taking the most recent figure. Some require two years and take the lower of the two; others take a straight average.
- › Casual and agency income: treated like permanent income at most lenders once around 12 months of consistent history exists in the same field, but the history requirement differs and some lenders run a longer averaging period than others.
- › Secondary employment: a second job or second employer is accepted at some lenders with six months of payslips; others want 12 months and still others exclude it entirely if it is in a different industry.
- › Rental income: most lenders shade gross rent to around 80% to account for vacancy and costs, but the rate differs. At a lender taking 70%, a $700-a-week investment property contributes $36,400 a year to assessed income; at one taking 80%, it contributes $41,600.
How do living-expense benchmarks and credit limits change what you can borrow?
Even where income is assessed identically, the expense side of the equation can produce very different results. Most lenders use the Household Expenditure Measure (HEM), a benchmark derived from the ABS Household Expenditure Survey, as a floor for living costs. They take the higher of what you declare or the HEM benchmark, so declaring lower expenses than HEM does not help you.
HEM itself is updated quarterly and differs by household size and income band. A lender applying a more conservative version of HEM to your household profile will arrive at a higher assumed expense figure, which directly compresses how much you can borrow. The lender sees less surplus income, and the maximum loan falls.
Credit card limits are the other major variable. Most lenders treat credit card limits as approximately 3% to 3.8% of the limit per month as an ongoing commitment, assessed as though the card is fully drawn, regardless of the actual balance. On a $20,000 limit, that is a monthly commitment of $600 to $760 that reduces your assessed capacity, whether you carry a balance or pay it in full each month. A borrower with two cards holding a combined $30,000 in limits is carrying an assessed commitment of $900 to $1,140 a month before a single repayment has been mentioned.
Closing unused cards before applying is often the single easiest way to improve assessed capacity, and it's worth doing before you approach any lender.
Source: APRA.
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Does the APRA debt-to-income cap explain why some applications are declined at one lender but not another?
Yes, and this is one of the least-understood reasons for lender variation in Perth, WA. From 1 February 2026, APRA limits authorised deposit-taking institutions to writing no more than 20% of new lending at a debt-to-income ratio of 6 times gross income or higher. Owner-occupier and investor lending are tracked separately, so a lender can exhaust its investor quota well before its owner-occupier quota.
A borrower at a DTI of 6.2 who is declined at one lender may be approved at another that has more room in its quota that quarter. Non-bank lenders are not subject to this cap at all, which is why timing and lender selection matter beyond the rate comparison. If your income means a 6x or higher DTI is in play, the lender your broker chooses, and when they submit the application, genuinely changes the outcome.
Total debt for DTI purposes includes every credit card limit and HECS repayment as well as the proposed home loan. A borrower with a substantial HECS balance may be surprised to find it pushing them into the DTI cap range at some lenders but not others, because of differences in how the outstanding balance is factored against assessed income.
Source: APRA.
When does chasing a higher borrowing limit not make sense?
Borrowing the maximum a lender will offer is not always the right move. The assessment rate is the loan rate plus the 3.0% buffer, which means you are assessed at a rate materially higher than what you will actually pay. Lenders build that margin in so you can absorb a rate rise without defaulting. But it also means the maximum loan is sized for a higher-rate environment than the one you are actually entering.
If the repayments at the maximum figure leave you with little room in your budget for rate rises, a renovation, a child, or a period on one income, you are borrowing the bank's maximum, not your own sensible ceiling. A lender that gives you $100,000 more is not doing you a favour if the repayments are uncomfortable from day one.
The more useful question is not "how much will a lender give me?" but "how much can I comfortably service?" Those two figures are often different, and the gap between them is worth understanding before you commit.
Where a client's maximum and their comfortable ceiling are far apart, we'd usually structure the loan at the comfortable number and put the offset account to work. You can always draw down more equity later if you need it. You can't unwind a tight budget from day one.
Joe Del Borrello · Director, Launch Finance · Chat to the Launch team →
How do you compare lenders to find the one that suits your situation in Perth, WA?
Comparing lenders on rate alone misses most of what actually changes your outcome. The rate affects your repayments; the policy affects whether you get approved and for how much. You need both comparisons running at the same time, which is what a broker does across the panel.
The decisions that differ most between lenders:
- › Variable income treatment: which lenders count your overtime, bonuses or second income in full, and which shade or exclude them entirely. This is the highest-impact policy difference for borrowers with mixed income.
- › Expense benchmark: which lenders apply a more conservative HEM for your household size and income band. A small difference in the assumed benchmark compounds significantly over a 30-year loan term.
- › DTI quota headroom: which lenders have remaining capacity in their high-DTI pool for this quarter, where your borrowing lands above the 6x threshold. This changes from month to month and is not publicly disclosed.
Borrowers in Morley, Cannington or South Perth often find the difference between their bank's figure and the right lender's figure is large enough to change which property they can buy. Whether that gap is $40,000 or $120,000 depends entirely on their income shape and which lender is matched to it.
What goes wrong when borrowers rely on a single lender's assessment?
Relying on one figure from one lender is the most common reason Perth buyers either miss a purchase or end up in a loan that is not suited to them.
The most frequent problems:
- › Taking the first figure as the ceiling: the bank you already use is one lender among many, and it may not read your income type favourably. Their number is a data point, not the market's answer.
- › Applying to multiple lenders to compare: each credit application creates an enquiry on your credit file that stays there for five years. Multiple applications in a short window look like financial stress to any lender who sees the file. Compare through one broker, not through separate applications.
- › Ignoring credit card limits before applying: closing a card you don't use in the weeks before application can materially improve your assessed capacity. Leaving limits open because you pay the balance each month costs you nothing in interest but costs you borrowing power.
- › Treating pre-approval as guaranteed capacity: a formal pre-approval lapses, and if the market has moved or your circumstances have changed, the reissued approval may be for a different amount. Never commit to a purchase based on a lapsed pre-approval figure.
Frequently Asked Questions
Why did my bank give me a lower limit than my friend got at a different lender on the same income?
Lenders apply different policies to variable income, living expenses and credit limits. If your income includes overtime or bonuses, a lender that shades those will return a lower figure than one that counts them in full, even with identical base salaries.
Does applying to more lenders improve my chances of getting a higher borrowing limit?
No. Each application creates a credit enquiry on your file, and multiple enquiries in a short period can make lenders more cautious. Compare through a mortgage broker using a single application process rather than approaching multiple lenders directly.
Do credit card limits I never use affect how much I can borrow?
Yes. Most lenders treat credit card limits as a monthly commitment of around 3% to 3.8% of the limit, regardless of your actual balance. Closing unused cards before applying is often the fastest way to improve your assessed borrowing capacity.
Does the APRA debt-to-income cap mean I'll be declined if I borrow more than six times my income?
Not automatically. APRA limits how much high-DTI lending a bank can write in total, not whether it can write yours. If the lender still has capacity in its quota, your application can proceed. A non-bank lender is not subject to the cap at all.
Is a mortgage broker able to access lenders my bank can't offer?
Yes. A broker compares across a panel of lenders that includes banks, credit unions and specialist non-bank lenders, each with their own policies. Your own bank is one option on that panel, not a benchmark for what the market will offer.
Should I use a mortgage broker or go straight to a lender in Perth, WA?
A mortgage broker, every time. The entire value of this comparison, across income treatment, expense benchmarks and DTI quota, is invisible when you apply directly to one lender. A broker runs the same borrower's details across multiple policies simultaneously and finds the lender whose rules fit your income shape.
Your Next Steps
Getting the right borrowing limit isn't about finding a lender willing to say yes. It's about finding the one whose policy reads your income most accurately, so the number they return reflects what you can actually borrow, not what their system assumes about people like you.
The right lender for your borrowing situation depends on your circumstances, and that's a conversation worth having. Talk to the Launch Finance team or call 08 9367 4222, and we'll compare your options across 60+ lenders.
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External Resources
Launch Finance · Perth, WA · Launch Finance Pty Ltd (ABN 17 163 528 701), Corporate Credit Representative 454041 of BLSSA Pty Ltd (ABN 69 117 651 760), Australian Credit Licence 391237 · General information only - this article does not constitute financial advice. Please consider your own circumstances and seek professional advice before making any financial decisions.
