Serviceability determines how much you can borrow based on your income, expenses, and financial commitments.
Lenders use this calculation to confirm you can comfortably meet repayments without financial stress. For nurses and midwives, the process includes recognising shift allowances, penalty rates, and overtime as consistent income streams, which is where most applications either gain ground or lose it.
How Lenders Calculate Your Serviceability
Lenders start with your gross income, then subtract your living expenses, existing debts, and apply a buffer to your potential repayment at a higher interest rate than the actual rate you'll pay. This buffer, typically around 3%, protects both you and the lender if rates rise. The figure left over determines your borrowing capacity.
Consider a registered nurse earning a base salary of $80,000 with an additional $15,000 in shift allowances. If the lender only recognises base income, your borrowing capacity drops by roughly $75,000 to $90,000 depending on the lender's serviceability policy. When the full income is included, you move into a different property price range entirely.
Which Income Components Count for Nurses and Midwives
Base salary always counts. Shift allowances, penalty rates, and overtime are assessed differently depending on the lender. Some lenders require three months of consistent payments, others want six or twelve months, and a handful will accept rostered shift patterns as evidence even if they haven't been paid yet.
In our experience, midwives moving between casual and permanent contracts often face questions about income stability. A lender that accepts rostered allowances can approve an application where another declines it, even when the actual income is identical.
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Fixed Expenses and the HEM Benchmark
Lenders assess your expenses using either your declared living costs or the Household Expenditure Measure (HEM), a standardised benchmark based on household size and income. If your actual spending is lower than HEM, the lender typically uses HEM. If it's higher, they'll use your declared figure.
This affects nurses and midwives who live frugally or share accommodation. A single nurse with minimal rent might declare $1,200 in monthly expenses, but the lender applies HEM at $1,800, which reduces serviceability. You can't argue your way below the benchmark, so understanding this upfront shapes realistic expectations during pre-approval.
How Existing Debts Impact the Calculation
Every ongoing commitment reduces what you can borrow. Credit card limits count as debt even if the balance is zero, because lenders assume you could draw the full limit at any time. A $10,000 limit can reduce your borrowing capacity by $40,000 to $50,000.
Personal loans, car loans, and Buy Now Pay Later accounts all factor in. If you're six months from clearing a car loan, some lenders will exclude it from the calculation if you provide evidence the debt is ending soon. Others won't. Closing unused credit cards before applying improves serviceability more than paying down a small balance on active debt.
Assessment Rate Buffers and Stress Testing
Lenders don't assess your repayment capacity at the actual variable rate or fixed interest rate you'll pay. They add a buffer, usually 3%, and calculate repayments at that higher figure. This is called stress testing.
If the current variable interest rate is 6.5%, your serviceability is assessed at 9.5%. This protects you if rates rise, but it also means your approved loan amount will be lower than a basic repayment calculator suggests. The buffer is non-negotiable and applies to every applicant regardless of income level or deposit size.
Where Nurses and Midwives Gain an Advantage
Several lenders offer serviceability policies designed specifically for healthcare professionals. These policies recognise that nursing and midwifery income is stable, demand is high, and employment gaps are rare.
The advantage shows up in two areas: higher income recognition for allowances, and occasionally a slightly lower assessment buffer. Not every lender offers this, and the difference is meaningful. A midwife with $95,000 in total income including allowances might be assessed at $82,000 with one lender and $95,000 with another. That gap translates to around $65,000 in additional borrowing capacity.
When Serviceability Becomes the Limiting Factor
You might have a 20% deposit and clean credit history, but if your income doesn't support the loan amount you're seeking, the application stops. This happens most often when nurses or midwives are purchasing in high-value markets or when existing debts haven't been cleared before applying.
In a scenario like this, a registered nurse sought approval for a property requiring a $520,000 loan. Income supported $480,000. The options were to increase the deposit, add a co-borrower, or wait three months to clear a car loan and reapply. The third option added $50,000 to serviceability, and the application was approved without needing additional funds or another applicant.
Casual and Contract Income Assessment
Casual nursing and midwifery roles are assessed on the average income over the past 6 to 12 months, depending on the lender. Payslips and a letter from your employer confirming ongoing rostered shifts strengthen the application. If your hours fluctuate significantly, lenders average the income and may apply a discount to account for variability.
Some lenders won't accept casual income at all. Others will, provided you've been with the same employer for 12 months or more. If you've recently moved from casual to permanent, your income is assessed under the permanent contract terms even if you've only been in the role for a few weeks, as long as you've passed probation.
Rental Income and Investment Property Serviceability
If you're purchasing an investment property or already own one, lenders include 80% of the rental income in your serviceability calculation. The 20% reduction accounts for vacancy periods, maintenance, and management costs.
The investment loan itself is treated as a debt, so while rental income helps, it doesn't offset the full repayment obligation. If you're holding an owner occupied home loan and adding an investment loan, your total serviceability needs to cover both, even with rental income contributing.
Improving Your Serviceability Before Applying
Paying down credit card limits, closing unused accounts, and clearing short-term debts all improve your position. If you're currently renting and plan to purchase an owner occupied home loan to live in, your current rent usually doesn't count against you since it will be replaced by the mortgage repayment.
Increasing your income helps, but it needs to be documented and consistent. A one-off bonus or a single high-overtime month won't shift the calculation. If you've recently increased your base hours or moved into a higher classification, wait until you have three months of payslips showing the new income before applying.
Call one of our team or book an appointment at a time that works for you. We'll review your income structure, identify which lenders will recognise your full earning capacity, and run the serviceability calculation before you commit to a property.
Frequently Asked Questions
What is serviceability in a home loan application?
Serviceability is the lender's assessment of whether you can afford the loan repayments based on your income, expenses, and existing debts. Lenders calculate this by subtracting your living costs and financial commitments from your income, then applying a buffer to ensure you can still meet repayments if interest rates rise.
Do lenders count shift allowances and penalty rates for nurses?
Most lenders will count shift allowances and penalty rates, but the requirements vary. Some need three months of consistent payments, others require six to twelve months, and certain lenders will accept rostered shift patterns as evidence even before they've been paid.
How do credit card limits affect my borrowing capacity?
Credit card limits reduce your borrowing capacity even if the balance is zero, because lenders assume you could draw the full limit at any time. A $10,000 credit card limit can reduce your borrowing capacity by $40,000 to $50,000, so closing unused cards before applying can significantly improve your serviceability.
What is the assessment rate buffer and why does it matter?
The assessment rate buffer is an additional 3% that lenders add to the current interest rate when calculating your serviceability. If the actual rate is 6.5%, your repayments are assessed at 9.5% to ensure you can still afford the loan if rates increase. This buffer is non-negotiable and applies to all applicants.
Can casual nursing income be used for a home loan application?
Yes, casual nursing income can be used, but it's assessed on the average over the past 6 to 12 months depending on the lender. You'll need payslips and often a letter from your employer confirming ongoing rostered shifts. Some lenders require at least 12 months with the same employer before they'll accept casual income.
