Your borrowing capacity is the maximum loan amount a lender will approve based on your income, expenses, existing debts, and the serviceability buffer they apply to your application.
Lenders assess your capacity using a formula that multiplies your net usable income by a factor, then subtracts your committed expenses and applies a serviceability buffer of at least 3 percentage points above the actual loan rate. For registered nurses and midwives, the calculation often looks different to other occupations because many lenders recognise your income stability and apply more favourable treatment to shift allowances and overtime.
Why Your Shift Allowances Matter More Than You Think
Most lenders treat casual or irregular income with caution, requiring 6 to 12 months of payslips and shading the income by 20% or more. Nursing income is different. Shift allowances, penalty rates, and rostered overtime are contractual and appear consistently on your payslips. Lenders who understand health sector employment will count 100% of these loadings rather than shading them, which can increase your borrowing capacity by $50,000 to $100,000 or more depending on your base salary and roster.
Consider a registered nurse earning a base salary of $80,000 plus $18,000 in shift penalties. A lender unfamiliar with nursing income might assess you on $80,000 plus 80% of the penalties, giving a usable income of $94,400. A lender experienced with health professionals will assess you on the full $98,000. Over a 30-year loan term at current variable rates, that difference in assessed income translates to roughly $70,000 in additional borrowing capacity.
The Serviceability Buffer and What It Does to Your Numbers
Lenders must assess your capacity to service a loan at a rate at least 3 percentage points above the actual interest rate you will pay. If the variable rate on offer is 6.2%, the lender tests whether you can afford repayments at 9.2%. The buffer exists to protect you and the lender from rate rises, but it also means your borrowing capacity is lower than it would be if assessed at the actual rate.
The buffer applies to all new home loan applications. It does not apply when you refinance an existing loan to a new lender, though the new lender will still apply their own serviceability policy. If you hold an investment loan and are applying for an owner-occupied loan, both loans are included in the serviceability test, with your rental income offset against the investment loan commitment.
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What Expenses Lenders Count and What They Ignore
Lenders start with your gross income, deduct tax, then deduct your committed monthly expenses. Committed expenses include rent or mortgage repayments, credit card limits, personal loans, car loans, HECS-HELP debts, and any other ongoing credit commitments. Many nurses assume lenders assess actual credit card spending. They do not. Lenders assess the full credit card limit, even if you pay the balance in full each month.
If you hold two credit cards with a combined limit of $15,000, the lender assumes you could draw that full amount at any time and adds roughly $450 per month to your committed expenses, regardless of whether you use the cards. Closing unused cards or reducing limits before applying for home loan pre-approval can increase your borrowing capacity immediately.
Lenders do not count discretionary spending such as groceries, fuel, entertainment, or subscriptions in the same way. Instead, they apply a minimum living expense benchmark based on the Household Expenditure Measure published by the Australian Bureau of Statistics. If your actual discretionary spending is lower than the benchmark, the lender will still use the benchmark. If your actual spending is higher, some lenders will use your declared figure supported by bank statements.
How Debt-to-Income Limits Affect Higher Earners
From 1 February 2026, lenders regulated by APRA can approve no more than 20% of new owner-occupied loans to borrowers with a total debt-to-income ratio of six times gross income or higher. The limit applies separately to owner-occupied and investment lending. If your gross income is $100,000, a DTI of six times income means total borrowing of $600,000. If you are applying for a loan above that threshold, you are competing for a place within the 20% quota.
The DTI limit does not prohibit lending above six times income. It restricts the proportion of each lender's new lending that can exceed that threshold. In practice, this means lenders apply additional scrutiny to applications above the threshold and may require a larger deposit, lower LVR, or stronger demonstrated savings history. Nurses purchasing in higher-cost markets may find their borrowing capacity constrained by the DTI limit even when they pass the serviceability test.
If you are affected by the DTI limit, splitting your application between owner-occupied and investment purposes does not help, as the limit applies to your total debt. Increasing your deposit or considering a guarantor loan to reduce the loan amount below six times income can move your application outside the restricted quota.
How Lenders Treat HECS-HELP and Other Study Debts
HECS-HELP debts reduce your borrowing capacity even though you do not make voluntary repayments. Lenders calculate a notional monthly repayment based on your income and the compulsory repayment threshold. For a registered nurse earning $98,000 with a $40,000 HECS debt, the annual compulsory repayment is roughly 4.5% of income, or around $4,400 per year. Lenders include this as a monthly commitment of approximately $367, which reduces borrowing capacity by $60,000 to $80,000 depending on the interest rate and loan term.
Voluntarily paying down your HECS debt before applying for a home loan does not always improve your borrowing capacity in proportion to the amount repaid, because the notional repayment calculation is based on your income level rather than the outstanding balance. Paying off other higher-cost debts such as car loans or personal loans usually has a larger impact on your capacity.
Why Two Nurses Applying Together Does Not Always Double the Borrowing Capacity
Joint applications with another registered nurse or midwife increase your combined income, but they also combine your expenses and liabilities. If both applicants hold credit cards, car loans, or HECS debts, those commitments are added together and assessed against the combined income. The living expense benchmark also increases for a two-person household.
In many cases, two nurses with a combined gross income of $190,000 and minimal liabilities will borrow close to double what one nurse earning $95,000 could borrow alone. Where one or both applicants have significant existing debts, the combined borrowing capacity may be lower than expected. Running a borrowing capacity assessment before you start looking at properties helps you understand the realistic loan amount and avoid disappointment.
Calculating Your Own Estimate Before You Apply
You can estimate your borrowing capacity by taking your annual gross income, adding any shift allowances and overtime that appear consistently on your payslips, deducting tax, then deducting your committed monthly expenses multiplied by 12. Multiply the result by a factor between 5 and 6 depending on your deposit size and loan structure. The higher your deposit and the lower your LVR, the closer the factor will be to 6.
This formula gives a rough figure only. Lenders apply different assessment rates, living expense benchmarks, and income shading policies. Some lenders apply a discount to overtime or allowances even for nurses, while others count 100%. Some lenders apply higher living expense buffers for applicants with dependents. The only way to know your actual borrowing capacity with a specific lender is to submit your income and expense details through a broker familiar with home loans for nurses and the lenders who provide favourable treatment to health sector income.
Call one of our team or book an appointment at a time that works for you. We will run your income and commitments through the assessment policies of multiple lenders and give you a confirmed borrowing capacity figure you can rely on when you start your property search.
Frequently Asked Questions
How much can I borrow as a registered nurse?
Your borrowing capacity depends on your total income including shift allowances, your committed expenses such as credit cards and other loans, and the lender's serviceability buffer. Lenders who understand nursing income will assess 100% of your shift penalties rather than shading them, which can increase your capacity by $50,000 to $100,000 or more compared to a lender unfamiliar with health sector employment.
Does my HECS debt reduce how much I can borrow?
Yes. Lenders calculate a notional monthly repayment based on your income and the compulsory repayment threshold, even though you do not make voluntary repayments. A $40,000 HECS debt for a nurse earning $98,000 reduces borrowing capacity by roughly $60,000 to $80,000 depending on the interest rate and loan term.
What is the serviceability buffer and how does it affect my loan?
Lenders must assess your capacity to repay a loan at an interest rate at least 3 percentage points above the actual rate you will pay. If the loan rate is 6.2%, the lender tests whether you can afford repayments at 9.2%. This buffer protects you from rate rises but reduces the maximum amount you can borrow.
Will closing my credit cards increase my borrowing capacity?
Yes. Lenders assess the full credit card limit, not your actual spending or balance. If you hold two credit cards with a combined limit of $15,000, the lender adds roughly $450 per month to your committed expenses. Closing unused cards or reducing limits before applying can increase your borrowing capacity immediately.
What is the debt-to-income limit and does it apply to nurses?
From 1 February 2026, lenders regulated by APRA can approve no more than 20% of new owner-occupied loans to borrowers with total debt exceeding six times their gross income. The limit applies to all borrowers including nurses. If your income is $100,000 and you are borrowing more than $600,000, you are competing for a place within the 20% quota and may face additional scrutiny or requirements.
