Unlock the secrets to passing serviceability assessment

Serviceability assessment determines how much a lender will allow you to borrow based on your income, expenses, and existing commitments.

For borrowers in Brighton, where the median home sits comfortably above the South Australian average, understanding how lenders assess your capacity to service a loan shapes every decision from deposit planning through to choosing between an owner occupied home loan and an investment structure. The assessment goes well beyond your income. It considers everything from childcare costs and strata fees to the way lenders model interest rate movements over the life of the loan.

How lenders apply the serviceability buffer

Every lender must assess your ability to repay a home loan at a rate that is at least 3.0 percentage points above the actual loan product rate. If you are applying for a variable rate loan sitting at 6.2%, the lender will model your repayments as though the rate were 9.2%. This buffer has been in place since October 2021 and applies to all new borrowers, regardless of deposit size or loan amount.

The buffer exists to protect both you and the lender against future rate rises. In our experience, borrowers who plan their deposit and loan structure around the buffered rate, rather than the advertised rate, are far more resilient when repayments adjust. Consider a buyer applying for a loan on a property near the Brighton Esplanade. The property requires a larger loan amount given local values. If that buyer structures their household budget assuming the buffered rate from the outset, they are positioning themselves to absorb rate movements without financial strain.

What counts as income in a serviceability assessment

Lenders accept salary, wages, overtime, bonuses, rental income, and certain government payments as part of your total income. Not all income is treated equally. Base salary is weighted at 100%, while overtime and bonuses are often discounted to between 50% and 80% depending on consistency and the lender's policy. Rental income from an investment property is usually assessed at 80% of the total rent received to account for vacancy periods and maintenance.

If you are self-employed, lenders typically require two years of tax returns and may average your income across that period. A buyer running a local business in Brighton with fluctuating income across financial years will find that lenders focus on the lower or average figure rather than the most recent year's result. That approach protects the lender but can reduce your borrowing capacity if your most recent year was particularly strong.

How living expenses are calculated

Lenders use one of two methods to assess your living expenses. They either accept your declared expenses, provided they meet a minimum threshold, or they apply a benchmark figure based on the Household Expenditure Measure published by the Australian Bureau of Statistics. The benchmark varies by household size, income, and the number of dependants.

For a household in Brighton with two adults and two children, a lender applying the benchmark might estimate monthly living costs between $4,500 and $5,500 depending on income. If your declared expenses fall below that figure, the lender will use the benchmark instead. This floor prevents borrowers from understating their living costs to inflate their serviceability. Borrowers who are paying private school fees, which are common in this area given proximity to multiple independent schools, should declare those costs explicitly. Lenders will include them, and failing to disclose them upfront can result in delays or a reduced loan offer once the full picture emerges during verification.

The debt-to-income lending limit introduced in February 2026

From February 2026, APRA introduced a limit on the proportion of loans that authorised deposit-taking institutions can write to borrowers with a debt-to-income ratio of six times or greater. Each lender can extend up to 20% of new owner-occupier loans and up to 20% of new investor loans to borrowers above that threshold. The limit applies separately to each portfolio and does not restrict non-bank lenders.

A buyer in Brighton earning a combined household income of $150,000 can borrow up to $900,000 before reaching the DTI threshold of six times income. Borrowing beyond that figure does not make the loan impossible, but it does mean the loan falls within the 20% cap the lender must manage across all new lending in that quarter. In our experience, borrowers who sit just above the six times threshold often have more success with lenders who have not yet allocated their full 20% quota for the period, or by working with a broker who has access to non-bank lenders not subject to the cap.

How existing debts affect your serviceability

Every debt you hold at the time of application reduces the amount you can borrow. Lenders include credit card limits, personal loans, car loans, and buy now pay later accounts in their assessment. A credit card with a $10,000 limit is assessed as though you are carrying the full $10,000 balance, regardless of what you actually owe. Lenders model repayments at between 3% and 4% of the limit per month.

Consider a buyer who holds three credit cards with a combined limit of $30,000. Even if the cards are paid off in full each month, the lender will add between $900 and $1,200 to the buyer's monthly commitments. Over a 30-year loan term, that reduces borrowing capacity by around $180,000 to $240,000. Closing unused cards or reducing limits before applying for pre-approval is one of the most direct ways to improve your serviceability outcome.

Why lenders assess investment loans differently

Lenders apply a higher interest rate buffer and stricter expense assumptions to investment loans compared to owner-occupied lending. Rental income is shaded to account for vacancy, and the loan is assessed at a higher serviceability rate. If you are purchasing an investment property in Brighton while living elsewhere, the lender will also include your current rent or mortgage in the assessment alongside the new loan.

The difference in treatment reflects the higher risk associated with investment lending. If financial pressure arises, borrowers prioritise their home over an investment property. Lenders structure their policies accordingly. Buyers looking to build a portfolio that includes a Brighton property should model each loan at the investment serviceability rate from the outset, even if they plan to start with an owner-occupied purchase and convert it later.

How to prepare for a serviceability assessment

Start by gathering three months of payslips, recent tax returns if you are self-employed, and statements for every account that shows income or expenses. Close or reduce any credit facilities you do not use. Declare all expenses including childcare, private health insurance, school fees, and strata levies. If you hold an offset account with savings that reduce your current mortgage balance, provide statements showing the offset balance alongside the loan.

Lenders will verify your information against bank statements and credit reports. Discrepancies between what you declare and what the statements show will delay the application and may result in a lower loan offer or a decline. If you have recently changed jobs, some lenders require you to have passed probation before they will assess your income at full value. Others will accept an employment contract and evidence that you have started in the role. Knowing which lenders apply which policy is where working with a broker who understands the detail makes a measurable difference to the outcome.

Call one of our team or book an appointment at a time that works for you. We will walk through your full financial position, model your serviceability across multiple lenders, and structure the application to give you the most accurate picture of what you can borrow before you start looking at properties in earnest.

Frequently Asked Questions