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How Do Banks Calculate Your Borrowing Power in Australia? (2026 Guide)
Banks test your loan at your rate plus APRA's 3-point buffer and count your full credit limits. Here's exactly how lenders calculate borrowing power in 2026.
In 2026, the single biggest reason your borrowing power feels smaller than your budget suggests has nothing to do with your salary. It's that a lender doesn't test you at the rate you'd pay. It tests you about 3 percentage points higher, on the regulator's instruction (Australian Prudential Regulation Authority, APG 223 Residential Mortgage Lending, 2022). This guide walks through every input a bank weighs, in the order it weighs them, so you can see exactly where your loan ceiling comes from.
- Lenders assess you at your actual rate plus a buffer of at least 3 percentage points, so a ~6.5% loan is stress-tested near 9.5% (APRA, APG 223, 2022; buffer held at 3 points, last reaffirmed July 2025).
- For living costs, banks use the higher of your declared expenses or the HEM benchmark from the Melbourne Institute, so under-stating spending rarely helps (APRA, 2022).
- Your full credit-card limit counts as debt even at a zero balance, and most non-salary income is discounted by at least 20% (APRA, 2022).
- Borrowing power is lender policy, not a fixed number; most banks lend around five to six times gross income, and shopping lenders is the most underrated move a buyer can make.
What is borrowing power, and who decides it?
Borrowing power is the maximum a lender will approve you to borrow, and it's set by lender policy, not by one universal formula. Australia's consumer regulator is blunt about this: a borrowing calculator's result "does not take your personal circumstances into account," and you still have to satisfy the lender's own criteria (ASIC MoneySmart, Mortgage calculator, 2026).
So the same household can get three different numbers from three banks. Each lender runs your income, living expenses, existing debts, and deposit through its own serviceability model, then applies the rules APRA sets for all of them. The output isn't a valuation of you. It's an estimate of the repayment a lender believes you could survive if rates rose.
That distinction matters, because it tells you where to push. You can't change APRA's buffer, but you can change your declared expenses, your credit limits, and which lender you approach. Here's the part most buyers miss: borrowing power isn't a score you "have." It's a calculation you can partly engineer, weeks before you ever sign a contract.
What does a lender actually look at?
In 2026, every Australian lender's serviceability assessment turns on the same five inputs: your income (often shaded), your living expenses (benchmarked against HEM), your existing debts and credit limits, your deposit and the resulting loan-to-value ratio, and the assessment rate APRA forces on top of your real rate (APRA, APG 223 Residential Mortgage Lending, 2022). Get those five right and you can predict your own ceiling fairly closely.
Think of it as a funnel. Income comes in at the top, expenses and debt repayments are subtracted, and what's left is your "surplus." The bank then checks whether that surplus could still cover the loan repayment at the stressed assessment rate. If it can, you're serviceable. If it can't, your loan amount drops until the sums balance.
Two more rules sit over the top. A debt-to-income (DTI) limit caps your borrowing as a multiple of income, and a loan-to-value ratio (LVR) rule shapes how much deposit you need and whether you'll pay lenders mortgage insurance. We'll take each input in turn. For the broader buyer-journey context, see our borrowing-readiness checklist for Australian buyers.
How do lenders treat your income?
Lenders count your stable income in full but discount most variable income by at least 20%, so a $40,000 bonus is typically assessed as roughly $32,000 (APRA, APG 223, 2022). APRA's guidance tells banks to apply "discounts of at least 20 per cent on most types of non-salary income," and many lenders cut deeper on less reliable earnings.
This is called income shading, and it catches more buyers than they expect. Overtime, commission, casual shifts, bonuses, and rental income are all commonly shaded to around 70–80% of their face value. The logic is that a bank wants to lend against income it believes will still be there in three years, not income that spikes in a good quarter.
If your pay is mostly base salary, this barely touches you. But if a big slice of your income is variable, two lenders can value the same payslip very differently. According to APRA's APG 223, banks must apply at least a 20% haircut to non-salary income, which is why a self-employed buyer or a heavy-commission earner often borrows less than a salaried colleague on the same headline income. It pays to ask a broker which lenders treat your income type most generously.
How do lenders measure your living expenses?
Banks don't simply take your word on spending. They use the greater of your declared living expenses or a benchmark called the Household Expenditure Measure (HEM), which is produced by the Melbourne Institute at the University of Melbourne (APRA, APG 223, 2022). So if you declare $2,000 a month but HEM for your household says $4,000, the lender assesses you on $4,000.
HEM estimates what a household of your size, income, and location typically spends on essentials and modest discretionary items. It's a floor, not a ceiling. Declaring unrealistically low expenses won't lift your borrowing power, because the benchmark catches you. The practical takeaway is the opposite of what many buyers assume: you can't shrink your way to a bigger loan by claiming you barely spend. The benchmark assumes a baseline regardless.
What you can do is clean up genuine, recurring discretionary spending in the months before you apply. Lenders increasingly scan transaction data, so regular subscriptions, frequent buy-now-pay-later purchases, and gambling transactions can all push your assessed expenses above HEM. A tidy three months of statements is one of the cheapest ways to protect your number. Want the underlying rule in detail? See what the APRA serviceability buffer is and how it sizes your loan.
How do your debts and credit limits cut your borrowing power?
A credit card reduces your borrowing power by its full approved limit, not your balance, so an unused $10,000 card still counts as debt. Reducing or closing it can lift borrowing capacity by an estimated $40,000 to $60,000, according to broker analysis (Australian Property Experts, "Borrowing Capacity 2026: What 4.35% Does to Your Numbers", 5 May 2026). Treat that dollar range as a single broker estimate, not a regulator figure, but the mechanism is well established across lenders.
Here's why it bites so hard. A lender assumes you could max out every available limit tomorrow, then assumes a monthly repayment against that full amount. A $10,000 limit you never touch is still modelled as a monthly liability. The same logic applies to car loans, personal loans, HECS-HELP repayments, and buy-now-pay-later accounts.
So before you apply, list every limit and repayment, not just what you owe. Cancelling a spare card, closing a finished BNPL account, or paying out a small personal loan often recovers more capacity than chasing a slightly sharper interest rate. From what we've seen across buyers using knest.ai to prep for a broker conversation, trimming unused credit limits is the move that most often surprises people with how much room it frees up.
Why do banks test you at a higher rate than you'll pay?
Because APRA requires it. Lenders must assess your repayments using a buffer of at least 3 percentage points above the loan's actual interest rate, and APRA reaffirmed it would hold that buffer at 3 points in July 2025 (APRA, macroprudential settings update, 23 July 2025). So if your real owner-occupier rate is around 6.5%, the bank checks whether you could still pay at roughly 9.5%.
This single rule is the biggest structural drag on what an ordinary buyer can borrow. It's not punitive; it's a shock absorber, designed so you don't default the first time rates climb. But it means your loan ceiling is set against a rate you may never actually pay.
The buffer also explains why a small cash-rate move erases tens of thousands in capacity: when your assessed rate rises, the buffer rides on top and multiplies the effect. According to APRA's APG 223, the buffer floor is 3 percentage points, and it stays put even if the Reserve Bank pauses or cuts. For a worked example of how three 2026 hikes flowed through this buffer, see how three rate rises cut a couple's borrowing power by about $72,000.
What is debt-to-income, and does APRA's cap limit you?
Debt-to-income (DTI) measures your total borrowing against your gross income, and most lenders cap it around five to six times, with some stretching to seven to nine. Separately, from 1 February 2026 a bank can't write more than 20% of its new lending to borrowers at a DTI of six times or higher (APRA, Activation of debt-to-income limits as a macroprudential policy tool, 2026). Read that carefully: it's a limit on the lender's book, not a ceiling on you.
So does APRA's cap shrink your loan? Usually not. In the December 2025 quarter, loans at six times income or higher were about 6.8% of new lending, up from 5.8% a year earlier, but still well under the 20% allocation limit (APRA, Quarterly ADI property exposure statistics, December 2025, 2026). At a system level, the cap isn't currently binding for the typical buyer.
Your own DTI limit is set by your lender, so it's worth shopping around. A couple earning $200,000 might be capped near $1.2 million at one bank and higher at another, purely on policy. A lot of coverage lumps APRA's DTI cap in with the serviceability buffer, as if both shrink your loan. They don't. The 3% buffer is the structural drag on ordinary buyers; the DTI cap mostly rations highly leveraged investor lending.
How does the cash rate change your borrowing power?
Every Reserve Bank rate move shifts your assessed rate, and because of the 3% buffer, a single quarter-point hike removes roughly $12,000 from a single borrower's capacity and about $24,000 from a couple's (Australian Property Experts, Borrowing Capacity 2026, 5 May 2026). As of June 2026, the RBA cash rate sits at 4.35% (Reserve Bank of Australia, Cash Rate Target, 2026).
The effect is already visible in the data. New owner-occupier loan commitments fell 6.9% in the March 2026 quarter, and the average new owner-occupier loan reached $735,000 even as approvals dropped (Australian Bureau of Statistics, Lending Indicators, March quarter 2026, 13 May 2026). Buyers are stretching for fewer, larger loans against a tighter test.
This is why your borrowing number has a shelf life. A pre-approval calculated in January may not survive a May rate change. For how the rate cycle is feeding into prices across the capitals, see our 2026 capital city property outlook.
How can you increase your borrowing power before you apply?
You can lift your borrowing power most by cutting unused credit limits, clearing small debts, and comparing lenders, since policy differences alone can swing your ceiling by hundreds of thousands (Australian Property Experts, Borrowing Capacity 2026, 5 May 2026). None of these require earning more; they change how a lender reads what you already have.
Five moves, in rough order of impact:
- Cut or cancel unused credit-card limits. The full limit counts as debt, so reducing a $10,000 card can recover an estimated $40,000–$60,000 in capacity (Australian Property Experts, 2026).
- Clear small consumer debts. Pay out or close personal loans, car loans, and buy-now-pay-later accounts; each removes an assessed monthly repayment.
- Tidy three months of spending. Lenders use the higher of your declared expenses or HEM, but visible discretionary spending can push you above the benchmark (APRA, 2022).
- Compare lenders deliberately. DTI multiples, income shading, and expense treatment vary, so the same file can clear at one bank and fail at another.
- Consider a joint application or longer loan term. Both can raise serviceable capacity, though a longer term raises total interest paid.
Before you act on any of these, map your real numbers. knest.ai's Home Loan Expert helps you organise your income, expenses, and limits, prepare the questions to take to a broker, and recognise where a licensed professional needs to confirm the figures, all from the buyer's side. If you choose to use it, knest.ai introduces you to a licensed broker only with your agreement, and discloses any benefit it receives. Meet the Home Loan Expert in the knest.ai app.
The bigger picture
Borrowing power can feel like a verdict, but it's really a calculation, and you have more influence over the inputs than the headlines suggest. The cash rate and APRA's buffer are out of your hands. Your credit limits, your declared spending, your small debts, and your choice of lender are not. Two of those four can move your ceiling by tens of thousands within a single month, with no change to your salary. So don't anchor on a number a calculator spat out in January. Build your plan around what a lender will actually approve today, refresh it when rates move, and treat the buffer, not the headline rate, as the real constraint. That's the difference between hoping a bank says yes and knowing roughly what it will say before you ask.
Frequently asked questions
How much can I borrow on my income in Australia?
Most lenders lend around five to six times your gross income, with some stretching to seven to nine, but the exact figure depends on your expenses, debts, and the lender's policy. A couple earning $200,000 might be capped near $1.2 million at one bank and higher at another (APRA, 2026).
Why does my credit card reduce my borrowing power if I don't use it?
Because lenders assess your full approved limit as debt, not your balance. An unused $10,000 card is modelled as a monthly liability you could draw tomorrow. Cancelling or reducing it can lift capacity by an estimated $40,000–$60,000, according to broker analysis (Australian Property Experts, 2026).
What is the HEM and how does it affect my loan?
HEM is the Household Expenditure Measure, a living-cost benchmark from the Melbourne Institute. Lenders assess you on the higher of your declared expenses or HEM, so understating spending rarely helps your borrowing power (APRA, APG 223, 2022).
What interest rate does the bank use to test my loan?
Not the rate you'll pay. APRA requires lenders to assess you at your actual rate plus a buffer of at least 3 percentage points, held at 3 points since July 2025. So a ~6.5% loan is tested near 9.5% (APRA, 2025).
Does APRA's debt-to-income cap limit how much I can borrow?
Usually not. The 20% cap from February 2026 limits each lender's book, not you personally. High-DTI loans were about 6.8% of new lending in the December 2025 quarter, well under the limit, so it mainly affects highly leveraged investors (APRA, 2026).
Sources
- Australian Prudential Regulation Authority, Prudential Practice Guide APG 223 Residential Mortgage Lending, December 2022, retrieved 2026-06-10, https://handbook.apra.gov.au/ppg/apg-223
- Australian Prudential Regulation Authority, APRA announces update on macroprudential settings (serviceability buffer held at 3 percentage points), 23 July 2025, retrieved 2026-06-10, https://www.apra.gov.au/news-and-publications/apra-announces-update-on-macroprudential-settings
- Australian Prudential Regulation Authority, Activation of debt-to-income limits as a macroprudential policy tool, 2026, retrieved 2026-06-10, https://www.apra.gov.au/activation-of-debt-to-income-limits-as-a-macroprudential-policy-tool
- Australian Prudential Regulation Authority, Quarterly ADI property exposure statistics, December 2025, released 2026, retrieved 2026-06-10, https://www.apra.gov.au/quarterly-authorised-deposit-taking-institution-property-exposure-statistics-december-2025
- Australian Bureau of Statistics, Lending Indicators, March quarter 2026, released 13 May 2026, retrieved 2026-06-10, https://www.abs.gov.au/statistics/economy/finance/lending-indicators/latest-release
- Reserve Bank of Australia, Cash Rate Target, retrieved 2026-06-10, https://www.rba.gov.au/statistics/cash-rate/
- Melbourne Institute, Applied Economic and Social Research, Household Expenditure Measure (Social Indicator Reports), retrieved 2026-06-10, https://melbourneinstitute.unimelb.edu.au/research/family-and-labour-economics/projects/2012/household-expenditure-measure-quarterly-updates
- Australian Property Experts, "Borrowing Capacity 2026: What 4.35% Does to Your Numbers," 5 May 2026, retrieved 2026-06-10, https://australianpropertyexperts.com.au/blog/borrowing-capacity-2026-australia/
- ASIC MoneySmart, Mortgage calculator, retrieved 2026-06-10, https://moneysmart.gov.au/home-loans/mortgage-calculator
— Eleanor Hayes — Editor, knest.ai
knest.ai is an AI property-intelligence platform for home buyers, not a buyer's agent, lender, or broker. This article is general information only, not personal financial or credit advice, so get advice tailored to your situation and confirm your numbers with a licensed broker before you act.
