Everything You Need to Know About Serviceability Assessment

Serviceability determines how much a lender will let you borrow based on your income, expenses, and financial commitments. The assessment calculates whether you can afford loan repayments at a higher rate than you will actually pay, leaving room for future rate rises or financial changes.

For buyers in Armadale, where properties often command premium prices due to proximity to Glenferrie Road shopping and High Street Armadale's dining precinct, serviceability becomes the primary constraint on borrowing capacity. Understanding how lenders calculate this figure helps you position your application correctly and avoid wasted effort on properties outside your approved range.

How Lenders Calculate Your Borrowing Capacity

Lenders assess your income against a test rate that sits above the actual interest rate you will pay. Most lenders add a buffer of around 3% to the current variable rate, meaning your repayments are calculated at a rate closer to 8% to 9% even if you are borrowing at 6%. The loan is approved only if your income can support repayments at this elevated rate while still covering living expenses and existing debts.

Your committed monthly expenses, including credit card limits, personal loans, and investment property costs, reduce the amount you can borrow. A credit card with a $20,000 limit reduces serviceability by roughly the same amount as if you were making minimum repayments on that full balance each month, regardless of whether you carry a balance. Reducing limits or closing unused cards before applying can lift your borrowing capacity.

Income Types That Strengthen Serviceability

Lenders treat income sources differently depending on stability and documentation. A salary earner with two years of employment history in the same role will see close to 100% of their base income counted toward serviceability. Bonuses, overtime, and commissions are generally assessed at 80% of the average over the past two years, provided payslips and tax returns confirm consistency.

Self-employed applicants face a more conservative approach. Most lenders assess income based on tax returns, adding back depreciation and some non-cash deductions to arrive at adjusted taxable income. Consider a buyer operating a consulting business from home in Armadale who reports $90,000 in taxable income but has claimed $15,000 in home office depreciation. A lender may assess income at $105,000, but this still falls short of what a salaried employee earning the same gross amount would be credited with, because the lender applies a margin for income variability.

Living Expenses and the Household Expenditure Measure

Lenders use the Household Expenditure Measure, or HEM, to estimate your monthly living costs based on household size and income level. This standardised benchmark replaced earlier methods where applicants simply declared their expenses. The HEM figure represents what a household in your situation typically spends and forms the floor below which lenders will not assess your expenses, even if you claim to live more frugally.

If your actual expenses exceed the HEM calculation, the lender will use your declared figure instead. Applicants who regularly spend on private school fees, childcare, or frequent travel should expect their stated expenses to be used in the assessment, reducing the loan amount they can service. Armadale's proximity to schools such as Lauriston Girls' School means families in the area often carry education costs that push declared expenses above HEM benchmarks.

Debt Commitments and How They Reduce Capacity

Existing loans and credit limits directly reduce how much you can borrow. Lenders assume you will use the full limit of any credit card, even if the current balance is zero. A $30,000 credit card limit reduces your maximum loan amount by approximately $150,000 to $180,000 depending on the lender's serviceability model.

Investment property debt is treated differently to owner-occupied debt. Lenders assess rental income at around 80% of the lease amount to account for vacancy and maintenance periods, then deduct the loan repayment calculated at the test rate. If the investment property generates negative cash flow after these adjustments, that shortfall is deducted from your available income, further constraining serviceability. Buyers holding negatively geared properties in inner suburbs often find their borrowing capacity tighter than expected when seeking to purchase in Armadale.

How Couples and Joint Applications Affect Capacity

Joint applications combine the income of both applicants, but also combine their debts and living expenses. Two applicants each earning $100,000 will not necessarily borrow twice as much as a single applicant on the same income, because the HEM figure for a two-person household is higher than for one person, and any debts held by either party reduce the combined capacity.

Lenders also apply a dependency adjustment if children are part of the household. The HEM increases with each additional dependent, reducing the amount available to service a loan. Couples applying together should review all credit commitments and close any accounts that are no longer required, as the cumulative effect of small debts can reduce the combined loan amount by a significant margin.

Serviceability for Investment and Owner-Occupied Loans

The purpose of the loan affects how it is assessed. Owner-occupied loans are generally assessed at a lower rate or with slightly more lenient expense assumptions than investment property loans, because lenders view your primary residence as lower risk. Some lenders also apply a higher interest rate buffer to investment loans, meaning the same income and expenses will support a smaller loan amount if the property is not your home.

Buyers purchasing in Armadale as an investment need to account for this difference. Rental yields in the area tend to sit below 3% due to higher property values, meaning the rental income contributes little to offsetting the loan repayment in the serviceability calculation. The shortfall between rent received and the test rate repayment is treated as an expense, reducing how much you can borrow against your employment income.

When Serviceability Becomes the Binding Constraint

Deposit size and serviceability both limit how much you can borrow, but only one will be the active constraint in any given scenario. A buyer with a $200,000 deposit may have enough to meet a 20% deposit on a $1,000,000 property, but if their income only services a loan of $700,000, the deposit becomes irrelevant beyond the amount needed to avoid Lenders Mortgage Insurance.

Armadale's median property values mean that serviceability is often the limiting factor for single applicants or those with moderate incomes, even when deposit savings are substantial. A buyer with $250,000 saved but an income that services only $850,000 will need to adjust their property search accordingly, focusing on attached properties or smaller homes rather than the larger period residences closer to Kooyong Road.

Improving Your Serviceability Position Before Applying

Reducing credit limits, paying down personal loans, and consolidating debt into your existing home loan can all increase the amount you can borrow. Each $10,000 reduction in credit card limits typically adds $50,000 to $60,000 to your borrowing capacity, depending on the lender. Buyers should action these changes at least three months before applying, as lenders require updated statements showing the reduced limits or closed accounts.

Increasing your income, either through a pay rise, additional employment, or formalising previously casual income streams, also lifts serviceability. Lenders require evidence that any new income source is sustainable, so a three-month history of payslips or a signed contract is usually necessary before it will be included in the assessment. If you are considering a home loan application, addressing these factors early ensures you receive an accurate pre-approval amount and avoid disappointment during the property search.

Serviceability is not static. Lenders update their assessment rates and HEM figures periodically, and a calculation done six months ago may no longer reflect current lending conditions. Buyers working with a mortgage broker in Armadale benefit from updated serviceability estimates that reflect each lender's current policies, ensuring the figures used to guide your property search remain accurate throughout the buying process.

Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions