Why Lenders Give Different Borrowing Limits in South West Sydney, NSW, What Actually Changes Your Number
You've done the online calculator. Your partner has done a different one. You've both come back with different numbers, and neither matches what the bank said on the phone. If you're buying in South West Sydney, NSW, that confusion is almost universal, and it's not a glitch.
Lenders use different income assessment rules, different expense benchmarks and different policies on what counts as a commitment. Two buyers with identical payslips, sitting in front of two different lenders, can walk away with borrowing limits $80,000 to $150,000 apart. The difference isn't the rate. It's the policy.
At Infinity Mortgage Brokers, we compare across 40+ lenders to find the one whose policy suits your situation. The home loan assessment process is where most of that gap is made or lost, and it's exactly the kind of difference that's worth understanding before you apply anywhere.
Key takeaways
- Lenders add a 3% buffer on top of the actual rate to assess repayments.
- Your credit card limit, not its balance, reduces what you can borrow.
- Income type matters: overtime, bonuses and casual pay are counted differently across lenders.
Why do lenders in South West Sydney, NSW give different borrowing limits for the same income?
Lenders don't all run the same calculation. Each one uses its own assessment rate, its own expense benchmark and its own rules about what counts as income. APRA requires every authorised lender to add a 3% buffer on top of the actual rate before assessing whether you can afford the repayments, but the rate they start from differs, which means the buffer lands at a different number depending on who you're talking to.
Source: APRA.
How does the serviceability assessment actually work?
Every lender starts with your gross income, then deducts a benchmark for living expenses. Most lenders use the Household Expenditure Measure (HEM), a Melbourne Institute benchmark built from the ABS Household Expenditure Survey and updated quarterly. The key rule: lenders take the higher of what you declare and the HEM floor. Telling a lender your expenses are lower than the benchmark doesn't help, because the HEM wins regardless.
On top of that floor, lenders add separate commitments: existing loan repayments, credit card limits assessed as though fully drawn (typically 3% to 3.8% of the limit per month), HECS repayments and any buy now pay later arrangements showing on your bank statements. Those commitments reduce what's left over for a new mortgage repayment, which directly lowers your limit.
The final figure is what's left after expenses, commitments and a buffer-adjusted repayment. Two lenders using slightly different HEM inputs and slightly different starting rates can produce numbers well apart from each other on an identical application.
The most common thing I see is someone who went to their bank first, got a number, and assumed that was the market. Once we run the same application through lenders whose models suit their income shape, the number is often materially higher. The bank's number isn't wrong; it's just one lender's answer.
Dimitri Giannopoulos · Director, Infinity Mortgage Brokers · Chat to Dimitri →
What income does a lender actually count toward your borrowing limit?
Base salary from a permanent role is accepted at full value by almost every lender. Everything else is subject to policy, and policy differs.
How lenders typically treat variable income:
- › Overtime: most lenders accept between 80% and 100% of overtime, and want to see a consistent history before counting it at all. The gap between 80% and 100% on a regular overtime figure moves the borrowing limit more than most borrowers expect.
- › Bonuses and commissions: typically averaged over one to two years. A single strong year isn't enough; lenders want consistency before they'll include it.
- › Casual income: accepted once a history in the same field is established, usually around 12 months. Agency and bank shifts are treated similarly.
- › Rental income: typically shaded to 80% of gross. Holding costs for the investment property are added as a separate commitment on top.
- › Self-employed income: two years of tax returns is the standard, though some lenders accept one year with an accountant's declaration. What lenders add back, and what they don't, varies and changes the assessed income figure considerably.
Whether you're at Liverpool Hospital, a private practice, working PAYG or on an ABN, the income type you're earning shapes which lenders will give you the most. That's not a sales line; it's a genuine reason the right lender varies by situation.
What commitments reduce how much you can borrow in South West Sydney?
Every financial commitment lenders can see on your credit file or your bank statements reduces the repayment capacity available for a new loan. The most common ones that catch buyers off guard:
The things that quietly lower your limit:
- › Credit card limits: assessed as though fully drawn, at roughly 3% to 3.8% of the limit each month. A $20,000 card limit reduces monthly repayment capacity by $600 to $760 whether you carry a balance or not. Closing cards before you apply makes a real difference.
- › HECS/HELP debt: the compulsory repayment is counted as an ongoing commitment, reducing borrowing capacity while the debt remains. It's the repayment, not the balance, that lenders count.
- › Buy now pay later: appears on bank statements and is treated as a commitment by most lenders. There's no published policy, but it shows up in the assessment.
- › ATO payment plans: also visible on bank statements and treated as a regular commitment. A payment plan in place at the time of application reduces what's available for a mortgage repayment.
In suburbs like Moorebank, Edmondson Park or Chester Hill, where house medians sit between $1.3m and $1.4m, every dollar of borrowing capacity matters. Clearing a credit card or an ATO plan before applying is often the practical lever most available to buyers.
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How does the APRA debt-to-income cap affect your limit?
Since February 2026, APRA requires authorised lenders to write no more than 20% of new lending at a debt-to-income ratio of six times gross income or higher. Owner-occupier and investor lending are tracked separately, so a lender can exhaust its investor quota before its owner-occupier one. Non-bank lenders are not subject to the cap.
In practice, this means a lender near its quota may decline a file it would have approved earlier in the quarter, while another lender with room still available will write the same loan. Timing within a quarter matters, and lender selection matters more. DTI is calculated on total debt, including credit card limits and HECS, divided by gross annual income. A high earner with a large credit card limit can breach the threshold even with comfortable repayment capacity.
If your income is strong but your DTI sits at or above six times, the question isn't whether you can afford the repayments. It's which lender still has quota available, and whether a non-bank lender is a better fit for the application. That's a genuine reason two equally creditworthy buyers get different answers in the same week.
Source: APRA.
When does a different lender genuinely change the outcome?
Lender selection changes the outcome most when your income is mixed, your commitments are visible, or your DTI sits close to the threshold. A buyer earning base salary plus regular overtime, with a HECS debt and a credit card, will get a different limit from lenders who shade overtime differently. A buyer who is self-employed will get a different limit from lenders who apply different add-back rules to the same tax returns.
For most buyers in South West Sydney, the practical question is whether the lender whose model fits their situation is on the broker's panel. A lender that doesn't appear on a panel is a lender whose answer you never see. That's the mechanical reason a broker comparing across 40+ lenders produces a different result than an application to a single institution.
The situation where a different lender does NOT change the outcome is simpler: a buyer with straightforward permanent income, no significant variable components, minimal commitments and a DTI well below six. For that buyer, most lenders arrive at similar numbers and the rate becomes the primary lever. For everyone else, lender selection is at least as important as rate.
Where buyers lose ground most consistently is by applying to the lender that feels familiar rather than the one whose policy suits them. A declined application or a low valuation sits on the credit file. I'd always rather run the comparison properly first, even if that takes another week, than let a borrower take a result that rules out the lender they actually needed.
Dimitri Giannopoulos · Director, Infinity Mortgage Brokers · Chat to Dimitri →
How do you find the lender whose policy suits your situation in South West Sydney, NSW?
The lender whose model gives you the most isn't knowable from a comparison website, because comparison sites show rates, not assessment policies. Assessment policies are what produce the number.
The decisions that move your limit, and where lenders differ on them:
- › Overtime treatment: some lenders count consistent overtime in full; others shade it to 80%. On a regular overtime figure, the difference in the assessed income can be tens of thousands of dollars, which flows directly to the borrowing limit.
- › Credit card assessment rate: lenders apply between 3% and 3.8% of the limit per month. The gap between those two rates on a $20,000 card is $160 per month in assessed commitments.
- › DTI quota position: a lender near its 20%-above-six-times cap will decline a file it would have approved earlier. A broker seeing multiple lenders in real time knows which ones have room.
Comparing across the panel finds which lender's policies produce the strongest position for your specific income and commitment profile. A standard application to a familiar lender finds only that lender's answer.
What are the steps to work out your real borrowing limit?
Step 1: Talk to us
We start by mapping your income type and commitments against the lenders on our panel, so we know which policies favour your situation before anything is submitted.
Step 2: Pull your full financial picture together
Payslips, tax returns or BAS, credit card limits, HECS balance and bank statements give us the same view lenders will see, which lets us model the assessment accurately before lodging.
Step 3: Match you to the right lender and apply
We submit to the lender whose assessment model gives you the strongest result, not the one with the most visible brand, and manage the application through to conditional approval.
Step 4: Support you through to settlement
Once approved, we stay across the process to settlement, including liaising with your solicitor or conveyancer if the valuation or conditions need addressing.
What gets in the way when buyers try to work out their own limit?
Where borrowers lose ground:
- › Applying to the wrong lender first: a decline or a low pre-approval from a lender whose model doesn't suit your income sits on your credit file as an enquiry. Multiple enquiries in a short window signal credit-seeking behaviour, which makes the next lender more cautious.
- › Treating calculator outputs as lender assessments: online calculators use simplified assumptions and no lender's actual HEM or shading policy. The number is a rough guide, not an approval.
- › Not clearing reducible commitments before applying: credit card limits and buy now pay later arrangements that are genuinely not needed are straightforward to close before applying. Leaving them open is leaving capacity on the table.
Frequently Asked Questions
Why did the same lender give me and my partner different limits on the same property?
Income type and existing commitments differ between applicants. If one borrower has a HECS debt, a higher credit card limit or a variable income component the lender shades, the assessed capacity comes out lower even on similar gross salaries.
Does my credit score directly set my borrowing limit?
No. A credit score affects which lenders will consider your application, not the loan amount. Your assessed income and commitments set the limit; the credit score determines which lenders' policies you're eligible under.
Will closing a credit card before I apply actually make a difference?
Yes, meaningfully. A $20,000 card limit assessed at 3.5% per month adds $700 in assessed monthly commitments. Closing it before applying removes that commitment entirely from the assessment.
Does the APRA DTI cap mean I can't borrow above six times my income?
Not exactly. APRA limits how much high-DTI lending banks can write, not whether any individual loan is possible. Non-bank lenders are outside the cap, and banks that haven't hit their quota will still lend above six times income.
Should I use a mortgage broker or go directly to a lender to maximise my borrowing limit?
A mortgage broker, every time. A single lender gives you one assessment model. A broker comparing across 40+ lenders finds whose model gives you the strongest number for your specific income shape and commitments.
How does rental income from an investment property affect my borrowing limit for a new loan?
Lenders typically count 80% of gross rental income while adding the investment property's holding costs as a separate commitment. The net effect depends on the property's yield and the lender's specific rental shading policy.
Your Next Steps
Your actual borrowing limit in South West Sydney, NSW isn't set by one calculator or one lender's answer. It's the outcome of which income components get counted, which commitments land in the assessment, and which lender's model fits your situation. Understanding that gap is why the right lender matters more than most buyers realise before they start applying.
Ready to find out which lenders will work best for your home loan? Contact the Infinity Mortgage Brokers team or call 0426 955 190. We'll canvas our 40+ lender panel and find the most suitable options for your circumstances.
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External Resources
Infinity Mortgage Brokers, Bankstown and South West Sydney. This website is general information only and does not constitute financial advice. Please consider your own circumstances and seek professional advice before making any financial decisions.
