Your Borrowing Power Depends on How Lenders Assess Your Expenses
Lenders don't just look at your income when deciding how much you can borrow. They run a serviceability assessment that factors in your living expenses, existing debts, and a buffer rate well above the actual interest rate you'll pay. A dual-income household earning $140,000 combined might be approved for $650,000 with one lender and $720,000 with another, depending on how each assesses your monthly commitments.
In New Lambton, where the median house price has been sitting around the mid-to-high $800,000 range, understanding serviceability before you start looking can save you from making an offer you can't finance. The assessment isn't about affordability at today's rate. It's about whether you could still make repayments if rates climbed by another 3%. That calculation changes depending on what debts you carry, how many dependents you have, and even the credit limit on cards you never use.
The Credit Card Limit That Cost $80,000 in Borrowing Capacity
Lenders assess your credit card based on the limit, not the balance. If you have a $20,000 limit and owe $2,000, the lender assumes you could max it out tomorrow and calculates a monthly repayment obligation of around 3% of that limit. That's roughly $600 a month in assumed debt, even if you pay the balance in full each month.
Consider a couple looking to buy near Lambton Park. Combined income of $135,000, no car loans, but two credit cards with a combined limit of $35,000 and a current balance under $4,000. The lender's serviceability model treated that as a $1,050 monthly commitment. Cancelling one card and reducing the other to a $5,000 limit brought the assumed monthly commitment down to $150. That change alone lifted their maximum loan amount by close to $80,000, which moved them from being borderline for a unit to comfortably pre-approved for a house with a small yard.
If you're not using the full limit, reduce it or close the account before you apply. The lender doesn't care that you're disciplined with credit. The algorithm assumes you're not. You can find more detail on how this affects your overall borrowing capacity and what other factors lenders weigh when running the numbers.
Why Your Living Expenses Are Higher Than You Think
Most lenders use the Household Expenditure Measure (HEM), a standardised benchmark based on household size and income. Even if you live frugally, the lender will often apply HEM if it's higher than your declared expenses. For a couple with no kids earning $130,000, HEM might set your monthly living costs at around $3,200, regardless of what you actually spend.
Some lenders allow you to declare lower expenses if you can show a genuine spending pattern over three to six months via bank statements. Others don't. If your actual spending is $2,400 a month but the lender applies $3,200, that $800 difference reduces how much you can borrow by roughly $150,000, depending on the interest rate and loan term.
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In suburbs like New Lambton, where you're competing for well-located homes near the university precinct or close to Lexington Parade, knowing which lenders will accept your actual spending instead of HEM can determine whether you're in the running or priced out before you start. We regularly see applicants assume all lenders assess the same way. They don't. Some will work with your real expenses if the evidence supports it. Others won't budge from HEM no matter how tight your budget is.
Investment Properties and Rental Income: How Much Actually Counts
If you already own an investment property, lenders will only credit a portion of the rental income when assessing serviceability. Most apply a shading factor of 70% to 80%, meaning if the property brings in $2,400 a month, the lender might only count $1,920. They also deduct interest, property management fees, and sometimes a vacancy buffer.
The rental income doesn't offset the loan commitment dollar for dollar. If the investment loan repayment is $2,200 a month and the rent is $2,400, the lender doesn't see that as neutral. After shading and deductions, the rental income might be assessed at $1,800, leaving you $400 a month short. That shortfall gets added to your liabilities and reduces what you can borrow for the next home loan.
Some lenders are more generous with shading, particularly if the property has a strong rental history and low vacancy risk. If you're looking to buy an owner-occupied home in New Lambton while holding an investment property elsewhere, the lender you choose matters as much as the rate they offer. A lender that shades rental income at 80% instead of 70% can add $50,000 to $70,000 to your borrowing capacity without changing a single detail of your financial position.
The Buffer Rate Adds Three Percentage Points to Every Calculation
Serviceability isn't calculated using the actual variable or fixed rate you'll pay. Lenders add a buffer, typically 3%, to make sure you can still afford repayments if rates rise. If the current variable rate is 6.2%, the lender assesses your ability to repay at 9.2%. That higher rate is what determines your maximum loan amount.
A borrower applying for a $700,000 loan at 6.2% would have monthly principal and interest repayments around $4,300. At the buffered rate of 9.2%, those repayments jump to roughly $5,700. The lender uses the higher figure to decide if you can service the loan. If your income and expenses don't support repayments at 9.2%, you won't be approved for $700,000, even though you'd comfortably manage the actual repayment at 6.2%.
This is why two applicants with identical incomes can be approved for vastly different amounts. One might have a $15,000 car loan and a $25,000 credit card limit. The other has no car loan and a $5,000 limit. The second applicant can service a loan $120,000 larger, purely because their non-mortgage commitments are lower when assessed at the buffered rate.
HECS Debt Is Treated as a Monthly Repayment Obligation
If you have a HECS or HELP debt, lenders treat it as an ongoing liability. They calculate a deemed repayment based on your income, even though the actual deduction comes out of your tax. For someone earning $90,000 with a $35,000 HECS debt, the lender might apply a monthly commitment of around $600, which reduces borrowing capacity by $110,000 to $120,000.
Some lenders assess HECS more favourably than others, particularly if your income is high relative to the debt balance. If you're a professional couple in New Lambton, both with degrees and combined HECS debt sitting around $60,000, that can shave $150,000 or more off your maximum loan amount with certain lenders. Others apply a lower repayment percentage or factor it differently depending on income thresholds.
Paying down or paying off HECS before you apply can improve your position, but only if the trade-off doesn't wipe out your deposit. Reducing your HECS debt by $20,000 might lift your borrowing capacity by $35,000, but if that $20,000 came from your savings, you've just reduced your deposit and may end up paying Lenders Mortgage Insurance or borrowing less overall. The decision depends on where you sit relative to the 80% loan to value ratio and whether the capacity gain outweighs the deposit loss.
Income Shading for Self-Employed Borrowers and Casual Employees
If you're self-employed, lenders typically require two years of tax returns and assess your income after deductions, not your turnover. A sole trader showing $95,000 in taxable income after claiming $30,000 in deductions will be assessed on the $95,000, not the $125,000 gross. Some lenders allow add-backs for certain deductions like depreciation, but most take a conservative approach.
Casual and contract workers face income shading as well. Even if you've been with the same employer for three years, a lender might only count 80% of your casual income unless you can show it's guaranteed or ongoing. That shading can drop your assessed income from $75,000 to $60,000, cutting your borrowing capacity by $80,000 to $100,000 depending on your other commitments.
We regularly see this with healthcare workers, trades contractors, and hospitality staff in the New Lambton area. The income is stable, the hours are consistent, but the employment type means the lender shades it. Choosing a lender that treats casual income at 100% after 12 months of consistent payslips, rather than shading it at 80%, can be the difference between pre-approval for $520,000 and $600,000.
If you're ready to know exactly what you can borrow and which lenders will assess your situation most favourably, call one of our team or book an appointment at a time that works for you. We'll run the serviceability assessment across multiple lenders before you start looking, so you're making offers with confidence and backing you can rely on.
Frequently Asked Questions
How do lenders calculate my borrowing capacity?
Lenders assess your income, living expenses, existing debts, and dependents, then apply a buffer rate around 3% above the actual interest rate. They also use standardised expense benchmarks like HEM, which may be higher than your actual spending.
Does my credit card limit affect how much I can borrow?
Yes. Lenders assess your credit card based on the limit, not the balance, and assume a monthly repayment of around 3% of that limit. A $20,000 limit can reduce your borrowing capacity by $70,000 to $80,000, even if you owe nothing.
How does rental income affect my borrowing capacity for a new home loan?
Lenders only count 70% to 80% of rental income after deducting loan repayments, management fees, and sometimes a vacancy buffer. The rental income doesn't offset your investment loan repayment dollar for dollar in serviceability calculations.
Will my HECS debt reduce how much I can borrow?
Yes. Lenders calculate a deemed monthly repayment based on your income, even though HECS comes out of your tax. A $35,000 HECS debt can reduce borrowing capacity by $110,000 to $120,000 depending on your income level.
What is the buffer rate and why does it matter?
The buffer rate is an additional 3% lenders add to the actual interest rate when assessing serviceability. If the current rate is 6.2%, they assess your ability to repay at 9.2% to ensure you can manage repayments if rates rise.
