Common Mistakes When Calculating Borrowing Capacity

Your borrowing capacity is the maximum amount a lender will approve based on your income, expenses, debts and financial commitments.

Most buyers focus on saving for a deposit while overlooking how their current spending patterns and debt structure will be assessed months later when they apply for finance. The difference between what you think you can borrow and what a lender will approve often comes down to how expenses are categorised and which liabilities are treated as ongoing commitments. A buyer earning $95,000 with a $12,000 car loan, $4,500 credit card limit and monthly spending of $3,200 might assume their capacity sits around $520,000 to $540,000. Run those same figures through a lender's serviceability model and the approved amount could land closer to $480,000, or as high as $560,000, depending entirely on how the application is structured.

How Lenders Calculate What You Can Borrow

Lenders assess your capacity by applying your net income against all ongoing commitments, projected loan repayments and living expenses, then stress-testing the result at an interest rate 3.0 percentage points above the actual product rate. Your net income includes salary, rental income if supported by a lease, and other verifiable income streams. Committed expenses include existing loan repayments, credit card limits (not balances), buy now pay later account limits, child support, school fees, and an estimate of your living costs based on either your declared spending or the lender's benchmark, whichever is higher. The 3.0 percentage point buffer, known as the serviceability buffer, has been in place since October 2021 and applies to all new lending by banks, credit unions and building societies regulated by APRA.

Consider a couple with a combined income of $148,000, no dependents, a $15,000 personal loan with 18 months remaining, and two credit cards with combined limits of $18,000. Their monthly spend on groceries, utilities, transport, insurance and discretionary costs totals $4,100. The lender calculates repayment capacity using a test rate of around 9.3% assuming a variable rate product priced at 6.3%. The personal loan is a committed liability until it expires. The credit cards are assessed at 3.0% to 3.8% of the limit per month regardless of whether a balance is carried. In this scenario, the credit card limits alone reduce capacity by approximately $65,000 to $75,000 depending on the lender's credit card repayment assumption. Clearing one card and reducing the other to a $5,000 limit before lodging the application would recover most of that capacity without any change to actual spending behaviour.

Why Declared Living Expenses Can Work Against You

When you complete a loan application, you're required to declare your living expenses across categories such as groceries, utilities, transport, insurance, childcare, education and recreation. If your declared total falls below the lender's household expenditure measure, the lender applies the higher figure. The HEM benchmark is updated quarterly and varies by income, household size and geographic location. For a two-person household in Brisbane on a combined income of $145,000, the HEM floor typically sits between $3,600 and $3,900 per month. Declaring $2,800 in monthly expenses will not improve your assessed capacity because the lender substitutes the benchmark figure. Declaring $5,200 when your actual committed spend is lower will reduce your assessed capacity because the lender takes your declaration at face value.

Many Ashgrove buyers underestimate how discretionary spending in the months before application affects the assessment. If you're declaring costs honestly and those costs are high, your capacity will be constrained. The solution is not to understate expenses on the application, but to reduce actual outgoings in the lead-up so that your honest declaration aligns with a lower spending pattern. Subscription services, dining, weekend travel and retail purchases all contribute to the monthly average a lender will scrutinise when reviewing your bank statements. A three-month period of disciplined spending before application can mean the difference between a loan approval at the amount you need and a conditional approval with a shortfall.

The Debt-to-Income Limit and What It Means for Your Application

From 1 February 2026, APRA introduced a limit requiring each bank to restrict lending above a debt-to-income ratio of six times gross annual income to no more than 20% of new owner-occupier loans and 20% of new investor loans in any given quarter. The ratio is calculated by dividing your total proposed debt by your gross household income. For a household earning $130,000 seeking to borrow $820,000, the DTI ratio is 6.3. That application now falls within the lender's restricted allocation. It does not mean automatic decline, but it does mean the application will be assessed within a limited pool and may face additional scrutiny on income stability, expense validation and deposit source. If the same household reduced the loan amount to $780,000, the DTI ratio drops to 6.0 and the application is no longer subject to the quarterly cap.

The DTI limit applies to regulated lenders only. Non-bank lenders are not currently subject to the restriction, which creates an alternative pathway for borrowers whose applications sit marginally above the threshold and who meet all other serviceability criteria. The limit does not change how serviceability is calculated, but it does create a volume constraint that can affect timing and approval likelihood depending on where the lender sits relative to its quarterly allocation when your application is lodged.

Fixed Liabilities and How Loan Structures Affect Capacity

When you apply for a home loan, the lender assesses not only your current debts but also the structure and remaining term of each commitment. A car loan with six months remaining is treated differently to a car loan with four years remaining. Some lenders will exclude a liability from the ongoing assessment if the remaining term is 12 months or less and evidence of consistent repayment is provided. Other lenders apply a 6-month threshold. A $380 monthly car repayment with seven months remaining might add $4,560 to your assessed liabilities under one policy and zero under another. Knowing which lenders apply which treatment allows you to time your application or select a panel lender whose policy aligns with your circumstances.

Buy now pay later accounts, even those with low limits or zero balances, are treated as contingent liabilities by most lenders. A $1,000 limit might reduce your capacity by $3,000 to $4,000. Four accounts with an aggregate limit of $3,500 can collectively reduce capacity by $12,000 or more. Closing unused accounts before applying is one of the highest-return actions available to buyers who want to improve their assessed borrowing capacity. The same principle applies to store cards, charge cards and any other form of revolving credit.

Income Shading and Rental Income Treatment

Not all income is assessed at 100% of its value. Rental income from an investment property is typically shaded by 20% to account for vacancy, maintenance and management costs, meaning $500 per week in rent contributes $400 per week to your assessed income. Bonus and commission income may be averaged over two years and shaded by up to 20% to 50% depending on consistency and documentation. Overtime is treated similarly. If your base salary is $82,000 and you earned $11,000 in overtime last financial year and $14,000 the year before, the lender may include $10,000 to $12,500 as assessable income depending on their policy and whether your employer confirms the overtime is ongoing.

Self-employed applicants are assessed on net profit after business expenses and tax, averaged over two financial years. A sole trader showing $91,000 taxable income in one year and $78,000 in the prior year would be assessed on an average of $84,500, often with further adjustment depending on add-backs for depreciation and other non-cash deductions. The structure of your income and the quality of documentation you provide has a direct bearing on the amount a lender will approve. For buyers in Ashgrove where the median house price sits above $1,000,000, even a 10% difference in assessed income can shift borrowing capacity by $50,000 to $70,000.

Why Offset Balances and Savings History Matter

Your deposit is not just a contribution toward the purchase price. It's evidence of your ability to accumulate surplus income and manage commitments without relying on credit. Lenders distinguish between genuine savings, which are funds accumulated over at least three months in your own accounts, and non-genuine savings such as gifts, windfalls, tax refunds or borrowed funds. A buyer with $95,000 in savings built over 18 months will be assessed more favourably than a buyer with $95,000 received as a gift four weeks before application, even if both buyers have identical income and expenses. The savings history demonstrates capacity. The gift demonstrates support, but not behaviour.

An offset account balance held consistently over multiple months serves a similar function. It shows surplus income, spending discipline and financial margin. A buyer who maintains a $25,000 offset balance while servicing a $2,100 monthly rent or mortgage commitment is signalling a different risk profile to a buyer who runs their account to zero each month. Where an application sits close to a serviceability threshold or falls within a lender's restricted DTI allocation, the strength of your savings profile can influence the outcome.

Local Market Context and Price Expectations in Ashgrove

Ashgrove sits within the inner-north-west corridor of Brisbane, bordered by Newmarket, Alderley, Kedron and Kelvin Grove. The suburb is known for its proximity to the CBD, leafy streetscapes, character housing stock and access to private and state schooling. Buyers are typically upgrading families, professional couples and downsizers drawn to the combination of location, amenity and public transport links via the Ashgrove bus network and nearby Newmarket and Alderley train stations. Most houses in Ashgrove are post-war timber or chamferboard homes on elevated blocks, with a growing number of contemporary builds and subdivisions in pockets where lot size and zoning permit. Units and townhouses are less common and tend to be concentrated closer to Waterworks Road and Ashgrove Village.

Understanding how your capacity aligns with realistic price points in the suburb allows you to refine your deposit target and application timing. A household borrowing $750,000 and contributing a $150,000 deposit can consider properties around $900,000. That range covers a proportion of units, older homes requiring renovation, and smaller houses in less tightly held streets. If your target is a renovated four-bedroom house within the catchment for a preferred school, your price expectation is more likely to sit between $1,100,000 and $1,400,000, which implies a borrowing requirement of $900,000 to $1,150,000 assuming a 20% deposit. Knowing that requirement allows you to structure your application, manage liabilities and select loan features that align with both the approval amount and the ongoing repayment once settled.

Call one of our team or book an appointment at a time that works for you. We'll assess your current position, identify which lenders align with your circumstances, and structure your application to reflect the full extent of your capacity.

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