What Not to Overlook in Home Loan Serviceability

Serviceability is how a lender decides whether you can comfortably afford the loan you're asking for.

It's not just about what you earn. Lenders look at your income, subtract your living costs, add a buffer for rate rises, and work out what's left over. That leftover amount needs to cover the repayments on the loan you're applying for, plus a margin. If it doesn't, the application stops there, regardless of how much deposit you've saved or how long you've been in your job.

In Maroochydore, where the median house price sits around $1,250,000, serviceability tends to be the first hurdle for buyers who assume their income alone will carry them through. A couple earning $180,000 combined might expect to borrow $900,000, but if they're carrying $40,000 in combined car loans, a $12,000 credit card limit, and childcare costs of $1,800 a month, their serviceability can drop by $150,000 or more. That's the difference between being able to bid on a home in Mountain Creek or being priced out entirely.

How Lenders Calculate What You Can Afford

Lenders assess serviceability by taking your gross income, deducting tax, existing debt repayments, and a monthly living expense allowance, then applying an interest rate buffer on top of the actual loan rate. Most lenders use a buffer of 3%, so even if the rate you're offered is 6.2%, they'll test your repayments at 9.2%.

The living expense figure is where many applications fall over. Some lenders use the Household Expenditure Measure (HEM), which is a standardised estimate of what it costs to live based on household size and location. Others use your actual declared expenses if they're higher. If you're a family of four in Maroochydore with two young children, HEM might estimate your monthly living costs at around $4,200. But if your actual spend is $5,500 a month because of school fees, health insurance, and the reality of living on the Sunshine Coast, the lender will use the higher figure.

Consider a buyer applying for a home loan who earns $95,000 a year as a teacher at Mountain Creek State High School. After tax, that's roughly $6,100 a month. Subtract $2,800 for living expenses, $600 for a car loan, and $150 for a credit card minimum repayment. What's left is $2,550. At a 9.2% assessment rate, that supports a loan of around $410,000. If the buyer clears the car loan and credit card before applying, their borrowing capacity jumps to $530,000, unlocking access to units in Kuluin or older homes in Bli Bli rather than being limited to Nambour or out near Palmview.

Why Your Credit Card Limit Matters More Than Your Balance

Lenders assess your credit card based on the limit, not what you owe. If your card has a $15,000 limit and you pay it off in full every month, the lender still treats it as though you're making minimum repayments of around 3% of the limit each month. That's $450 a month in assumed debt servicing, which can reduce your borrowing capacity by $90,000 or more.

This catches people off guard. You might never carry a balance, but the lender assumes you could max it out tomorrow. The solution is to reduce or close unused cards before you apply. If you've got three cards with a combined limit of $35,000 and you only use one, cutting the limit down to $5,000 and closing the others can add $150,000 to your borrowing capacity.

We regularly see buyers in Maroochydore who've been pre-approved at one level, then find out halfway through their search that their credit card limits have quietly reduced what they can actually borrow. One buyer last year was looking at townhouses in Parrearra with a pre-approval of $820,000. When they formally applied, the lender reassessed and picked up a $20,000 credit card they'd forgotten about. Their approval dropped to $740,000, and they had to restart their search in Warana or push further inland.

Debt Commitments Lenders Count and Ones They Don't

Lenders count car loans, personal loans, credit cards, Buy Now Pay Later accounts, and other mortgages. They also count HECS debt, though it's treated differently. HECS reduces your take-home income rather than being added as a separate repayment, because it's deducted through the tax system once your income hits the threshold. For someone earning $85,000 with a $45,000 HECS balance, the reduction in net income can lower borrowing capacity by $40,000 to $60,000 depending on the lender.

Child support and spousal maintenance are deducted from income if you're paying them, or added to income if you're receiving them, though most lenders will only count maintenance income if it's formalised and there's at least two years remaining. Childcare costs are treated as a living expense and deducted from your surplus, but the Family Tax Benefit or Child Care Subsidy can be added back as income by some lenders if it's received consistently.

Buy Now Pay Later accounts like Afterpay or Zip are now treated the same way as credit cards. If you've got a $2,000 limit on a Zip account, the lender will assume a $60 monthly repayment and reduce your capacity accordingly. Even if the account has a zero balance and you haven't used it in months, it still counts. Closing it before you apply is the cleanest way forward.

How Living Expenses Are Assessed and Why Postcode Matters

Most lenders use HEM as the baseline, but HEM varies by location. Maroochydore sits in a regional centre band, which assumes slightly lower living costs than metro Brisbane, but still higher than rural Queensland. A single applicant in Maroochydore with no dependents might have a HEM figure of around $2,100 per month. A couple with two children could be assessed at $4,400 to $4,800.

If your actual expenses are higher than HEM, the lender will use your figures instead, but they'll ask for proof. Bank statements are the usual method. If your statements show $6,200 a month going out and HEM says $4,400, the lender takes $6,200. That difference of $1,800 a month can reduce borrowing capacity by $350,000 at a 9.2% assessment rate.

Some lenders allow you to exclude discretionary spending like holidays or dining out when calculating living expenses, on the basis that you'd cut back once you had a mortgage. Others don't. Knowing which lenders take that approach matters if your spending pattern includes regular non-essential costs that you'd be willing to adjust.

What the Interest Rate Buffer Does to Your Borrowing Capacity

The 3% buffer is non-negotiable with most lenders. It exists because the Reserve Bank and APRA want to make sure borrowers can still afford their loans if rates rise. If you're applying for a variable rate loan at 6.2%, the lender tests you at 9.2%. If you're applying for a fixed rate loan at 5.8%, the test rate is still 8.8% or higher, depending on how long the fixed term runs.

That buffer has a direct impact on how much you can borrow. At a 6.2% actual rate, a borrower with $3,000 a month in surplus income could service a loan of around $550,000. At the 9.2% test rate, that same borrower can only service $450,000. The difference between the two is why lenders don't just approve you based on the rate you'll actually pay.

Some non-bank lenders use a smaller buffer, or apply the buffer differently depending on whether you're taking a fixed or variable loan. That's where working with a mortgage broker in Maroochydore becomes useful, because not all lenders assess the same way, and a broker can tell you which one will give you the most capacity based on your specific situation.

Sole Traders and Self-Employed Applicants Face a Different Calculation

If you're self-employed, lenders usually average your last two years of taxable income. That means if you had a strong year recently but a weaker one the year before, the lender takes the average, not the peak. If your taxable income was $78,000 one year and $102,000 the next, the lender uses $90,000.

This is where tax planning and borrowing capacity can pull in opposite directions. If you've been minimising your taxable income to reduce your tax bill, you've also minimised what the lender thinks you earn. A tradie in Maroochydore running a successful business might be taking home $140,000 a year in real terms, but if they're only declaring $75,000 after deductions and write-offs, that's the figure the lender will use. At that income level, borrowing capacity might sit around $480,000, which won't stretch to a house in Buderim or Mooloolaba.

Some lenders offer low-doc or alternative income assessment options for self-employed borrowers, but these usually come with higher interest rates or lower maximum loan-to-value ratios. If you're planning to apply for a loan within the next 12 to 24 months and you're self-employed, it's worth speaking to an accountant and a broker together so you can structure your income in a way that supports the borrowing level you'll need.

Rental Income from Investment Properties Gets Discounted

If you already own an investment property and you're applying for an owner-occupied loan in Maroochydore, lenders will add the rental income to your application, but they won't count all of it. Most lenders apply a 20% haircut to allow for vacancy, maintenance, and rates. So if your investment property in Nambour is rented for $680 a week, the lender will only count $544 a week as income.

They'll also deduct the mortgage repayment on that investment loan at the same buffered rate they use for your new loan. If the investment loan is $420,000, the lender will assess it at 9.2%, not the actual rate you're paying. That creates a serviceability drag that can reduce your borrowing capacity for the new loan, even though the investment property is cashflow neutral or positive in reality.

If you're holding an investment property with a small amount of equity and weak rental yield, it can sometimes make sense to sell it before applying for your next owner-occupied loan, especially if the serviceability impact is larger than the deposit boost you'd get from selling. That's a decision that depends on your specific numbers, but it's one worth modelling before you assume the investment property will help your application.

Why Two Incomes Don't Always Double Your Borrowing Power

When two people apply together, lenders add both incomes and assess the loan as a joint application. But they also add both sets of liabilities and apply a combined living expense figure that's higher than a single applicant. The result is that two people earning $80,000 each won't necessarily borrow twice as much as one person earning $80,000.

If one applicant has significant debt or a low credit score, that can reduce the joint borrowing capacity below what the stronger applicant could have accessed alone. In that scenario, it can sometimes make sense to apply as a single applicant and add the partner to the title later, though that depends on whether the single income is enough to service the loan on its own.

This comes up regularly with couples in Maroochydore where one person is self-employed or on parental leave. If one partner is earning $110,000 in a salaried role and the other is on unpaid leave, applying on the single income might deliver a higher approval than waiting until both incomes are active again but one is still ramping back up.

If you're trying to work out what you can realistically borrow in Maroochydore, or if you've been knocked back and you're not sure why, call one of our team or book an appointment at a time that works for you. We'll go through your income, your debts, and your expenses, and we'll tell you exactly where you sit and what changes will make the biggest difference.

Frequently Asked Questions