Why Serviceability Matters More Than You Think

Serviceability determines whether a lender will approve your home loan application.

While deposit size and credit history matter, the serviceability assessment carries the most weight in determining how much you can borrow and whether your application proceeds. Lenders calculate whether your income can comfortably cover loan repayments plus living expenses, even if interest rates rise. For Bentleigh residents looking at properties near Centre Road or in the tree-lined streets south of the railway line, understanding this assessment before you apply can mean the difference between securing the property you want and missing out because your borrowing capacity falls short.

How Lenders Calculate What You Can Afford

Lenders assess your income against your committed expenses and an estimate of your living costs. They start with your gross income, including salary, rental income, and other verifiable earnings. From this, they subtract existing debts like car loans, credit card limits, personal loans, and HECS debt. What remains is tested against the proposed loan repayment, calculated at a buffer rate typically 2.5% to 3% above the actual interest rate you would pay. This buffer accounts for potential rate rises during the loan term.

The calculation also includes a measure for living expenses. Some lenders use the Household Expenditure Measure (HEM), which estimates minimum living costs based on household size and location. Others allow you to declare actual expenses, though they will often apply a floor figure if your declared costs seem unrealistically low. For a household in Bentleigh, a suburb with above-average property values and a strong concentration of families, lenders typically expect higher living expenses than they might for single borrowers in outer suburbs.

What Happens When Your Income Changes Mid-Application

A change in employment or income structure between pre-approval and formal application can require a complete reassessment. Consider a buyer who received pre-approval while working full-time in a salaried role, then moved to a similar role with a lower base salary but commission component before settlement. Even if the total expected income remained the same, many lenders would reassess based only on the guaranteed base salary until the commission income had been received and evidenced for three to six months. This can reduce borrowing capacity by tens of thousands of dollars.

In this scenario, the buyer would either need to negotiate a lower purchase price, contribute a larger deposit, or find a lender willing to accept a letter from the employer outlining commission structure and realistic expectations. Some lenders will accept projected commission if the role is similar to the previous one and the employer provides detailed documentation, but this is not universal. The assessment rules vary significantly between lenders, which is why borrowing capacity needs to be recalculated if your circumstances shift.

How Credit Card Limits Reduce What You Can Borrow

Lenders assess your credit card limits as if you have drawn the full amount, even if the balance sits at zero. A credit card with a $20,000 limit reduces your borrowing capacity by approximately $100,000 to $120,000, depending on the lender's assessment rate and your other commitments. This catches many applicants who keep cards open for occasional use or rewards points without realising the impact on serviceability.

The solution is to close or reduce limits on cards you do not actively need before applying. If you carry balances across multiple cards, consolidating to a single card with a lower total limit and paying down the debt will improve your position. Some Bentleigh buyers targeting properties in the $1.2 million to $1.5 million range, common for renovated homes near Patterson station, find that clearing a $30,000 credit card limit is what allows them to borrow enough to compete in that price bracket.

Investment Property Income and How It Affects Serviceability

Rental income from an investment property is not added to your income at full value. Most lenders apply a shading rate, typically including only 75% to 80% of the rental income in their calculations to account for vacancy periods, maintenance costs, and management fees. If your investment property generates $2,400 per month in rent, the lender may only credit you with $1,800 to $1,920 in the serviceability assessment.

At the same time, the full loan repayment on that investment property is counted as a committed expense. If you are looking to purchase an owner occupied home loan in Bentleigh while retaining an investment property elsewhere, the net effect on serviceability can be significant. In some cases, buyers choose to sell an underperforming investment property before applying for a larger owner-occupied loan, particularly if the rental yield is low and the debt is high.

Why Two Applicants with the Same Income Get Different Answers

Two buyers earning identical incomes can receive vastly different maximum loan amounts based on their expense profiles and debt structures. A single applicant earning $120,000 with no dependents, no car loan, and one low-limit credit card may be approved for a loan amount that a couple earning $120,000 combined with two children, childcare costs, and a car loan cannot access, even though the household income is the same.

Lenders also treat different income types with varying levels of certainty. Base salary is assessed at full value. Overtime and bonuses are often averaged over two years and may be shaded or excluded entirely if they are discretionary. Self-employed income requires two years of tax returns and is assessed after deductions, which can significantly reduce the figure a lender will use. For professionals in Bentleigh, a suburb with a high proportion of self-employed and small business owners, this often means borrowing capacity is lower than expected despite strong actual cash flow.

The Assessment Rate and Why It Matters More Than the Actual Rate

Your loan will be assessed at a rate higher than the interest rate you will actually pay. If the advertised variable rate is 6.0%, the lender will test your serviceability at 8.5% or 9.0%, depending on their policy. This buffer is designed to ensure you can still afford repayments if rates rise during the loan term.

This creates a gap between what you can comfortably afford in practice and what the lender will approve. Some buyers use a split loan strategy, fixing a portion of the loan to lock in repayments while keeping part variable for flexibility. While this does not change the serviceability assessment, it can provide certainty around your actual repayment obligations once the loan is approved. The assessment rate also explains why small changes in your debt profile or income can have an outsized impact on borrowing capacity.

Declared Expenses Versus the Household Expenditure Measure

Some lenders allow you to declare your actual living expenses, while others apply a benchmark figure. If your actual spending is lower than the benchmark, the lender will usually apply the higher figure anyway. If your actual spending is higher, they will use your declared amount, which reduces what you can borrow.

For buyers in Bentleigh, a suburb with a median household income above the Melbourne average and strong demand for private schooling, declared expenses often exceed the HEM benchmark. School fees, after-school activities, and higher general living costs in bayside suburbs can all reduce serviceability. If you are applying based on declared expenses, lenders will often ask for several months of bank statements to verify your claims, and any regular outgoings that do not align with your application can trigger questions or a reassessment.

When Refinancing Improves Serviceability for Future Purchases

If you currently have a home loan with a higher interest rate or no offset account, refinancing to a more competitive product can reduce your committed expenses and improve future borrowing capacity. A lower interest rate means lower monthly repayments, which frees up serviceability for a subsequent purchase or top-up.

This is particularly relevant for Bentleigh residents who may be considering upgrading within the suburb or purchasing an investment property while retaining their current home. Refinancing an existing loan from 6.5% to 5.8% on a $600,000 balance reduces monthly repayments by approximately $250, which can increase future borrowing capacity by $50,000 to $60,000 depending on your overall profile. The timing matters, as lenders will want to see at least three to six months of repayment history on the refinanced loan before considering a new application.

Understanding how lenders assess your capacity to service a loan allows you to structure your finances in a way that maximises your borrowing power. Whether that means closing unused credit facilities, timing an application around income changes, or adjusting your debt profile before you apply, serviceability is not a fixed constraint. It responds to deliberate preparation.

Call one of our team or book an appointment at a time that works for you to review your current position and identify what changes would have the most impact on your borrowing capacity.

Frequently Asked Questions