What borrowing capacity actually measures
Borrowing capacity is the maximum amount a lender will advance you based on your income, expenses, debts and the type of loan you're applying for. Lenders assess every application at an interest rate that is 3.0 percentage points above the product rate you've chosen, which creates a buffer that substantially reduces the amount you can borrow compared to what the loan would cost at the actual rate.
In Belconnen, where median property values have remained above the $650,000 mark for units and higher for houses in suburbs like Hawker and Kaleen, borrowing capacity directly determines which property types and locations remain accessible. A couple earning a combined $140,000 before tax, with no dependents and no other debts, might expect a borrowing capacity in the range of $750,000 to $800,000, depending on which lender assesses the application and how living expenses are calculated.
Lenders must complete a positive serviceability assessment under APRA's prudential standards, and the result varies between institutions due to differences in expense benchmarks, treatment of income types, and policy discretion around the buffer itself.
How existing debts reduce what you can borrow
Every dollar of monthly debt repayment reduces borrowing capacity by roughly $5,000 to $6,000, depending on the lender. A car loan with $400 in monthly repayments will typically reduce what you can borrow by around $24,000 to $30,000. Personal loans, buy-now-pay-later accounts, credit card limits and outstanding HECS-HELP debts all affect the calculation.
Credit cards are assessed on their limit, not the outstanding balance. A card with a $10,000 limit and a zero balance is treated as though you owe the full amount each month at the minimum repayment rate, which most lenders calculate at 3.0 to 3.8 per cent of the limit. That same card reduces capacity by approximately $50,000 to $60,000. Closing unused cards or reducing limits before applying can produce a measurable improvement in borrowing power without changing your income.
Buy-now-pay-later accounts are treated inconsistently. Some lenders assess them as ongoing commitments with a notional monthly repayment, others require evidence of closure before they are excluded from the calculation. If you have three or four active accounts, even with low or nil balances, consider closing them several months before a formal application.
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Income treatment across lender policies
Base salary is treated consistently, but variable income, overtime, commissions, rental income and income from self-employment are all subject to lender-specific policies. Most lenders require a minimum two-year history of overtime or bonus income and will average or discount it depending on consistency. Some will accept 80 per cent of the average, others require evidence that the income is ongoing and structural rather than discretionary.
Rental income from an investment property is typically assessed at 75 to 80 per cent of the gross rent, after deducting loan repayments, strata fees, council rates and an allowance for vacancy and management. If you already hold an investment loan and are applying for an owner occupied home loan, both the rental income and the loan repayment for that property will flow through the capacity calculation. Negative gearing reduces your taxable income but does not directly increase borrowing capacity.
For self-employed borrowers, lenders assess taxable income after business deductions, which creates a gap between cash flow and borrowing power. Adding back non-cash deductions such as depreciation can improve the assessment, but not all lenders accept addbacks consistently. Full financial statements, including profit and loss and balance sheet, are required, and most lenders use a two-year average of net profit after tax plus any salary drawn.
Living expenses and how lenders apply the Household Expenditure Measure
Lenders must apply the greater of your declared living expenses or a minimum benchmark figure based on household size and income. The benchmark is derived from the Household Expenditure Measure, which is published quarterly and updated regularly. At current settings, the benchmark for a couple with no dependents on a combined income of $140,000 is approximately $3,200 to $3,600 per month, depending on the lender's discretion and whether a geographic loading applies.
Declaring expenses that are lower than the benchmark will not improve your borrowing capacity, as the lender will apply the higher figure. Declaring expenses that are significantly higher than the benchmark, particularly discretionary spending, will reduce capacity further. Some lenders ask for transaction history or statements covering three to six months and will assess actual spending patterns rather than relying on declarations alone.
In our experience, applicants often underestimate recurring subscriptions, memberships, childcare and school fees, insurance premiums paid annually, and irregular expenses such as vehicle registration and maintenance. Providing a detailed and accurate expense declaration early in the process allows the broker to match you with a lender whose benchmark treatment is most suitable.
How deposit size and the loan to value ratio affect capacity and approval
The deposit you hold determines your loan to value ratio, which directly affects both the interest rate you are offered and whether you are required to pay lenders mortgage insurance. A borrower with a 10 per cent deposit will face a higher interest rate and mandatory LMI compared to a borrower with a 20 per cent deposit, and the LMI premium itself may need to be capitalised into the loan, which increases the amount borrowed and reduces the property price you can target.
Under APRA's Prudential Standard APS 112, lenders apply higher risk weights to loans with an LVR above 80 per cent, which increases the capital cost of the loan and can result in more conservative serviceability assessments. A 15 per cent deposit places you in the 85 per cent LVR band, which is a material improvement over 90 or 95 per cent LVR in terms of rate, premium and approval likelihood.
For buyers accessing the Australian Government 5% Deposit Scheme, borrowing capacity is assessed at the same serviceability buffer, but the LMI cost is eliminated through the guarantee provided by Housing Australia. Belconnen falls within the ACT-wide price cap of $1,000,000 for the scheme. The scheme does not change your underlying capacity, but it removes a cost that would otherwise need to be funded or capitalised, which improves your net position.
Which lender policies produce the highest capacity for your profile
Borrowing capacity varies materially between lenders due to differences in expense benchmarks, income treatment, credit policy and risk appetite. A borrower declined by one lender at a requested amount may be approved by another with an identical financial profile. Non-major lenders often apply more flexible expense benchmarks and accept higher DTI ratios within their risk appetite, which can produce capacity increases of $50,000 to $100,000 or more compared to a major bank assessment.
Consider a scenario where a single borrower earning $95,000 before tax has a $15,000 car loan and a declared rent of $2,200 per month. A major lender applies an expense benchmark of $2,800, assesses the car loan at 3.0 per cent of the balance per month, and calculates capacity at approximately $520,000. A non-major lender with a lower expense benchmark of $2,400 and a more favourable treatment of the car loan might produce a capacity figure of $560,000. The difference is not rate or product, it is policy and risk appetite.
Lender selection is not a process of applying to every available institution. Each application generates a credit enquiry, and multiple enquiries within a short period can weaken your credit file and signal urgency or prior refusal. A broker who understands lender policies can assess your profile and direct the application to the most appropriate lender on the first attempt, which improves both approval speed and outcome.
Small adjustments that produce measurable capacity improvements
Reducing your credit card limits by $20,000 in total will typically increase your borrowing capacity by $100,000 to $120,000. Paying out a car loan with six months remaining will immediately remove the monthly commitment from the calculation and increase capacity by the present value of those repayments, which is typically $15,000 to $20,000. Consolidating multiple small debts into a single loan with a lower monthly repayment will produce a similar improvement.
If you are self-employed and reporting net profit after all deductions, speak with your accountant about whether addbacks are appropriate for the next financial year and whether restructuring drawings or director salaries would improve your assessable income without materially affecting tax. If you earn overtime, ask your employer for a letter confirming that the overtime is ongoing and structural, which some lenders will accept in place of a full two-year history.
For buyers planning to purchase in the next 12 months, avoid taking on new debt, opening new credit accounts, or increasing existing limits. If a refinance or consolidation makes sense, complete it early so that the new loan has time to season and your credit file stabilises before the purchase application. If you are planning to move from full-time employment to contracting or self-employment, consider applying for pre-approval before the change takes effect, as your borrowing capacity as a PAYG employee will be significantly higher than your capacity immediately after becoming self-employed.
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Frequently Asked Questions
How much does a credit card limit reduce borrowing capacity?
A credit card is assessed on its limit, not the balance. A $10,000 limit typically reduces borrowing capacity by $50,000 to $60,000, as lenders calculate a notional monthly repayment at 3.0 to 3.8 per cent of the limit.
Why does borrowing capacity vary between lenders?
Lenders apply different expense benchmarks, treat income types differently, and have varying credit policies and risk appetites. A borrower declined by one lender may be approved by another with the same financial profile, with capacity differences often exceeding $50,000.
How is rental income assessed in a borrowing capacity calculation?
Most lenders assess rental income at 75 to 80 per cent of gross rent after deducting loan repayments, strata fees, council rates and an allowance for vacancy and management. The net figure is added to your other income for serviceability purposes.
What is the serviceability buffer and how does it affect borrowing capacity?
APRA requires lenders to assess your ability to service a loan at an interest rate 3.0 percentage points above the actual product rate. This buffer substantially reduces the amount you can borrow compared to what the loan would cost at the current rate.
Does paying off a car loan increase borrowing capacity immediately?
Yes. Paying off a car loan removes the monthly repayment from the serviceability calculation immediately. A $400 monthly car loan repayment typically reduces capacity by $24,000 to $30,000, so clearing the debt increases capacity by that amount.
