Your borrowing capacity is the maximum amount a lender will let you borrow, and it's rarely the same figure across different lenders.
Most people apply for a home loan expecting their salary to be the main factor, but lenders assess your entire financial picture including debts, living expenses, dependants, and how much buffer you have left after all commitments are paid. Understanding how this calculation works before you apply for a home loan means you can take steps to improve what you qualify for, or at least avoid surprises when pre-approval comes back lower than expected.
How Lenders Calculate What You Can Borrow
Lenders use your income, subtract your expenses and existing debts, then apply a buffer to see if you can still afford repayments if interest rates rise. Most lenders assess your loan at a rate around 3% higher than the actual rate you'll pay, which is called a serviceability buffer. Your total monthly commitments, including the theoretical higher repayment, can't exceed a certain percentage of your income, usually around 30% to 40% depending on the lender's policy.
Consider a buyer earning $95,000 a year with a $600 monthly car loan and average living expenses. One lender might calculate borrowing capacity at around $520,000, while another using a lower expense benchmark or smaller buffer might offer closer to $560,000. The difference comes down to each lender's assessment policies, which vary widely across the market.
What Counts as Income When Applying
Base salary is straightforward, but lenders treat other income types differently. Overtime, bonuses, and commission are usually averaged over the past two years and shaded by 80% to account for variability. Rental income from an investment property is included, but lenders deduct maintenance and management costs, often assuming 20% to 30% of gross rent goes toward those expenses. Self-employed income requires two years of financials, and lenders typically average your net profit after add-backs for depreciation.
For Auburn residents working in industries with shift allowances or regular overtime, like healthcare or transport, getting that income recognised in full makes a tangible difference to how much you can borrow. You'll need payslips showing the consistency of those earnings, and some lenders are more willing than others to include them at 100% rather than shading them down.
How Existing Debts Reduce Your Capacity
Every ongoing debt you have reduces what you can borrow, and credit cards are weighted more heavily than you'd expect. Lenders don't care what balance you carry, they assess the full credit limit as if you've maxed it out. A $10,000 limit can reduce your borrowing capacity by $40,000 to $50,000, even if the card sits at zero.
Personal loans, car loans, and Buy Now Pay Later accounts all count against you as well. If you're paying $400 a month on a car loan and have two credit cards with a combined $15,000 limit, you could be losing over $100,000 in borrowing power. Closing unused cards and paying down short-term debts before applying is one of the quickest ways to improve borrowing capacity.
Living Expenses and the HEM Benchmark
Lenders use either your actual declared expenses or a benchmark called the Household Expenditure Measure, whichever is higher. The HEM is based on Australian Bureau of Statistics data and scales with income, dependants, and location. For a single person earning $80,000 in Auburn, the HEM might sit around $2,200 per month. For a family of four earning $130,000 combined, it could be closer to $3,800.
If your actual spending is lower than the HEM, you don't get credit for it, the lender still assesses you at the benchmark. If your spending is higher, they'll use your actual figures and your capacity drops. This is why reducing discretionary spending in the three to six months before you apply makes a difference, it ensures your bank statements don't trigger a higher expense assessment.
Why Different Lenders Offer Different Amounts
Some lenders use aggressive serviceability buffers or high expense benchmarks, while others are more lenient. A major bank might assess your loan at 3.5% above the actual rate, while a smaller lender might use 2.75%. That half-percent difference can change your borrowing capacity by tens of thousands of dollars.
Policy differences also matter. Some lenders will accept 100% of overtime, others cap it at 80%. Some will allow rental income to be shaded at 20%, others insist on 30%. If you've been knocked back or received a lower pre-approval than expected, it's often worth testing your application with a different lender rather than assuming the first answer is final. A broker with access to multiple lenders can identify which serviceability policies suit your income and debt profile without you needing to apply multiple times and risk multiple credit checks.
Auburn-Specific Factors That Affect Borrowing Capacity
Auburn's median household income sits slightly below the Sydney average, and lenders apply location-based expense benchmarks that reflect the area's cost of living. For buyers looking at unit markets around Auburn Station or the retail precinct along Auburn Road, strata levies are a recurring cost that gets deducted from your capacity just like any other debt.
If you're buying an investment property in Auburn while living elsewhere, lenders will factor in the rental income but also the vacancy risk and management costs. Auburn's proximity to Parramatta and strong public transport links make it attractive to renters, which helps with rental income assessments, but you'll still see a 20% to 30% deduction from gross rent when the lender calculates your capacity.
Steps to Improve Your Capacity Before Applying
Close any credit cards or Buy Now Pay Later accounts you're not using. Pay down short-term debts like personal loans or car finance if you have savings available. Reduce your everyday spending for at least three months before you apply so your bank statements show lower outgoings. If you're self-employed, make sure your tax returns and financials for the past two years are finalised and lodged, lenders can't assess income they can't verify.
Getting a home loan pre-approval early in the process gives you a clear figure to work with and shows sellers you're ready to move quickly. Pre-approval is based on the same capacity calculation as final approval, so it's an accurate indicator of what you'll qualify for, assuming nothing changes between pre-approval and settlement.
If you're ready to find out what you can borrow or want to explore how different lenders assess your situation, call one of our team or book an appointment at a time that works for you.
Frequently Asked Questions
What is borrowing capacity and how is it calculated?
Borrowing capacity is the maximum amount a lender will let you borrow based on your income, expenses, debts, and a serviceability buffer. Lenders assess your loan at a rate around 3% higher than the actual rate to ensure you can afford repayments if interest rates rise.
How do credit cards affect my borrowing capacity?
Lenders assess the full credit limit of your cards as if you've maxed them out, even if the balance is zero. A $10,000 limit can reduce your borrowing capacity by $40,000 to $50,000, so closing unused cards before applying makes a significant difference.
Why do different lenders offer different borrowing amounts?
Each lender uses different serviceability buffers, expense benchmarks, and income shading policies. One lender might assess your loan at 3.5% above the actual rate, while another uses 2.75%, which can change your capacity by tens of thousands of dollars.
How can I improve my borrowing capacity before applying?
Close unused credit cards, pay down short-term debts, and reduce everyday spending for at least three months before you apply. If you're self-employed, ensure your financials are up to date and lodged so lenders can verify your income.
Do lenders count overtime and bonus income?
Yes, but most lenders average overtime and bonuses over two years and shade them by 80% to account for variability. Some lenders are more willing to include these income types at 100%, which can increase what you qualify for.
