Borrowing Capacity: The Ins and Outs of Approval

What Lenders Actually Look at When Calculating Borrowing Capacity

Borrowing capacity is the maximum amount a lender will approve based on your income, expenses, existing debts, and the serviceability buffer they apply. Every lender uses a different formula, which is why the same borrower can receive approval for $650,000 from one lender and $720,000 from another. The calculation starts with your gross household income, deducts tax, adds back certain allowances like rental income or franking credits, then subtracts your living expenses and existing debt commitments. The remaining surplus is tested against the loan repayment at an interest rate that sits roughly 3.0 percentage points above the actual product rate. If your surplus covers the tested repayment, the loan amount is within your borrowing capacity.

In our experience working with buyers in Chelsea Heights, where the median house price has been rising steadily, the difference between one lender's assessment and another can determine whether you qualify for the property you want or need to adjust your budget. The suburb attracts a mix of young families, downsizers, and investors drawn to its proximity to Westfield Southland, local parks like President's Park, and easy access to the bay. Buyers often underestimate how much their existing commitments reduce what they can borrow, particularly when they carry personal loans, car finance, or active credit card limits.

How the Serviceability Buffer Affects Your Approval

The serviceability buffer is the margin lenders add to the loan product rate when assessing whether you can afford the repayments. At present, lenders must test your ability to service a home loan at an interest rate at least 3.0 percentage points above the actual rate. If you're applying for a loan at a variable rate of 6.2%, the lender tests your income and expenses against repayments calculated at 9.2%. This buffer exists to protect both you and the lender from rate rises and changes in your financial circumstances.

Consider a buyer who earns $120,000 annually and wants to borrow $600,000 on a principal and interest loan. The actual monthly repayment at 6.2% would sit around $3,680. The tested repayment at 9.2%, however, climbs to roughly $4,900. The lender needs to see that your income, after tax and after all your committed expenses, can comfortably cover that higher figure. If your rent or existing mortgage, car loan repayments, childcare costs, and general living expenses leave you with only $4,500 in surplus income each month, you won't meet the serviceability test at that loan amount, even though you could afford the actual repayment. The solution might involve reducing the loan amount, paying down existing debts before applying, or switching to a lender with a more favourable expense benchmark.

The Role of Living Expenses in the Calculation

Lenders assess your living expenses using either your declared spending or a minimum benchmark based on household size and income, whichever is higher. The Household Expenditure Measure, used by many lenders, scales with income rather than staying static. A single person earning $80,000 might face a minimum living expense assumption of around $2,200 per month, while a couple with two children earning $150,000 combined could be assessed at closer to $4,500 per month or more, depending on the lender.

If your actual spending is lower than the benchmark, the lender will still apply the benchmark. If your actual spending is higher and you declare it honestly on the application, the lender uses your declared figure. This is where borrowers sometimes trip themselves up. Underestimating your real expenses on the application might get you through the initial assessment, but it sets you up for repayment stress if rates rise or your circumstances change. Overstating them unnecessarily, however, can shrink your borrowing capacity and lock you out of properties you could genuinely afford.

Debt-to-Income Limits and What They Mean for Chelsea Heights Buyers

From February 2026, lenders regulated by the Australian Prudential Regulation Authority can approve no more than 20% of their new owner-occupier loans to borrowers with a debt-to-income ratio of six times or greater. The same 20% cap applies separately to new investor loans. If your total household debt, including the new loan you're applying for, is six times your gross annual income or more, your application falls into this restricted category. For a household earning $140,000, total debt of $840,000 or above puts you over the threshold.

This doesn't mean you'll be declined automatically, but it does mean lenders are more selective about who gets approval in that higher bracket. They may apply stricter criteria around credit history, employment stability, deposit size, or the property type you're buying. In a suburb like Chelsea Heights, where established homes in well-regarded pockets now regularly transact above $900,000, buyers stretching to secure a family home close to local schools such as Carrum Downs Secondary College or Chelsea Heights Primary School need to understand how this limit interacts with their income. If your income is strong and your credit file is clean, you're more likely to be approved within that 20% allocation. If your income is modest relative to the loan amount, or you have any blemishes on your credit report, the lender may decline the application or offer a reduced amount to bring your debt-to-income ratio below six.

How Lenders Treat Rental Income and Investment Property Costs

If you already own an investment property or you're buying one while retaining your current home, lenders treat the rental income and property expenses differently depending on the scenario. For established investment properties with a lease in place, most lenders will shade the rental income, accepting only 75% to 80% of the gross rent to account for vacancy periods and management costs. If the property is negatively geared, the net loss reduces your borrowing capacity for any new loan. If it's positively geared, the net income after shading can add to your serviceability.

When you're purchasing a new investment property, lenders generally won't accept any rental income in the serviceability calculation until a lease is signed and rent is being paid, even if you provide a rental appraisal. They will, however, include the full loan repayment for the investment property as a committed expense, which reduces what you can borrow. This asymmetry often surprises buyers who assume the rental income will offset the new loan repayment in the lender's eyes. It won't, at least not initially. Borrowers purchasing an investment property in Chelsea Heights, where rental yields on units and townhouses can provide solid cash flow, need to factor in this assessment gap when planning their finance structure.

Why Different Lenders Approve Different Amounts

Lender policies vary widely on how they calculate income, apply living expense benchmarks, treat additional income sources like bonuses or overtime, and assess credit commitments. One lender might accept 100% of your overtime and bonus income if it's been consistent for two years. Another might accept only 80%, or none at all. One lender might apply a living expense benchmark of $2,800 per month for a couple with no children, while another applies $3,200. These differences compound quickly.

In a scenario where a self-employed buyer in Chelsea Heights earns a base of $90,000 plus variable income averaging $25,000 over the past two years, one lender might assess total income at $115,000, while another caps it at $100,000. Combined with differing expense assumptions and serviceability models, the borrowing capacity at the first lender could land at $680,000, while the second offers $610,000. The property you're hoping to secure might fall in between those two figures. This is where working with a mortgage broker who understands each lender's policy settings becomes valuable. We regularly see borrowers declined by their own bank, then approved at a higher amount elsewhere, simply because the policy fit was stronger.

Improving Your Borrowing Capacity Before You Apply

If your current borrowing capacity falls short of what you need, several levers can shift the outcome. Paying down or closing existing debts is the most direct. A $15,000 personal loan with monthly repayments of $450 might reduce your borrowing capacity by $80,000 to $90,000, depending on the lender. Clearing that debt before you apply can lift your approval amount significantly. Reducing credit card limits has a similar effect. Even if you don't carry a balance, lenders assess the repayment obligation based on the full limit, typically at 3% to 4% of the limit per month. A $20,000 credit card limit you rarely use can cost you $50,000 to $70,000 in borrowing capacity.

Increasing your deposit also helps, not by lifting borrowing capacity directly, but by reducing the loan amount required to purchase the property. If you're borrowing 90% of the purchase price and paying Lenders Mortgage Insurance, bringing that ratio down to 85% or 80% can sometimes open up access to lenders with stronger serviceability who don't write loans above 80% loan-to-value. Consolidating multiple small debts into a single facility with a lower monthly commitment can also improve the outcome, though you need to weigh the benefit against any fees or interest rate changes involved. If you're considering a refinance to consolidate debt, the timing matters. Refinancing before you apply for a new purchase loan gives you a clean credit file and clear serviceability picture. Refinancing after your purchase settlement avoids complicating the purchase approval process.

When to Get Pre-Approval and What It Actually Covers

Pre-approval confirms that a lender is willing to lend you a specified amount based on the financial information you've provided, subject to a satisfactory property valuation and no adverse change in your circumstances. It's not a guarantee, but it gives you confidence when making an offer and demonstrates to vendors that you're a credible buyer. In Chelsea Heights, where competition for well-located family homes can be strong, particularly those close to parkland or within walking distance of local shops on Wells Road, having home loan pre-approval in place before you attend auctions or make private treaty offers is a practical step.

Pre-approval typically lasts between three and six months, depending on the lender. During that period, any change in your employment, income, debts, or credit file can affect the final approval. Taking on new credit commitments, switching jobs, or reducing your hours will all trigger a reassessment. The property itself also needs to meet the lender's criteria. If you're approved for $750,000 but you make an offer on a property the lender values at $50,000 less than the purchase price, you'll either need to increase your deposit to cover the gap or renegotiate the sale price. The valuation is the last piece of the approval puzzle, and it's the one part you don't control until you've chosen a property.

If you're ready to understand exactly what you can borrow and which lenders will give you the strongest outcome based on your situation, call one of our team or book an appointment at a time that works for you. We'll run your scenario across multiple lender policies, explain where the differences sit, and help you structure your application to maximise your borrowing capacity without overcommitting.

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