It is one of the first questions almost every home buyer and investor asks: how much can I actually borrow? The honest answer is that it depends on more variables than most people expect, and the number a borrowing power calculator Australia gives you online can look very different from what a lender will approve when they assess your full application.
Understanding how lenders calculate your borrowing capacity puts you in a stronger position before you start property hunting. At ALIC, we have helped over 36,000 Australians work through exactly this question, and the differences between lenders can be substantial.
How Lenders Calculate What You Can Borrow
Your borrowing power is not simply a multiple of your income. Lenders conduct a detailed assessment of your financial position, weighing your gross income against existing liabilities and living expenses, then applying a serviceability buffer to make sure you could still meet repayments if rates were to rise.
Following the RBA’s rate increase on 3 February 2026, the cash rate sits at 3.85%. APRA requires lenders to assess your ability to service a loan at a minimum of 3% above the actual rate, meaning your repayments are stress-tested at around 7% or higher. That buffer is there to protect borrowers, but it also means the amount you can borrow may be noticeably less than you expected.
The Key Factors That Affect Your Capacity
Income
Base salary and wages are generally accepted at 100%. Overtime, bonuses, commission and rental income are treated more conservatively. Many lenders shade these at 70-80% of their actual value, and some exclude them altogether unless they can be demonstrated over a sustained period. Self-employed borrowers face additional scrutiny, with most lenders requiring two years of tax returns and assessing income based on average taxable profit rather than gross business revenue.
Existing Debts
Every existing liability reduces your borrowing power. This includes credit card limits (not just what you owe, but the full approved limit), car loans, HECS/HELP debt and any personal finance. On existing mortgages, lenders calculate repayments at the stressed rate, not the actual one. This matters particularly if you hold an owner-occupier loan and are applying for an investment loan simultaneously.
Living Expenses
Banks assess your living expenses using either the Household Expenditure Measure (HEM) benchmark or your declared actual expenses, whichever is higher. If your real expenses exceed HEM significantly, as they often do for households in Sydney, Melbourne and Brisbane, this will reduce your assessed capacity accordingly.
Why the Answer Varies So Much Between Lenders
Here is what most borrowers do not realise: lenders assess these factors in very different ways. One major bank might shade rental income at 70%, while another accepts it at 80%. One lender might apply a higher HEM benchmark than another. Some exclude HECS/HELP from serviceability calculations; others factor it in fully.
These differences can translate to borrowing capacity variances of $50,000 to $150,000 or more on the same income and liabilities. Using a single borrowing power calculator on one bank’s website gives you an incomplete and potentially misleading picture.
APRA’s guidelines on lending standards are available at apra.gov.au.
How to Improve Your Borrowing Power
If your initial capacity assessment comes back lower than expected, there are practical steps that can improve the picture. Reducing or closing unused credit card limits can have a meaningful effect, even if you never carry a balance. Paying down personal debt or car loans before applying similarly strengthens your position. For investors, restructuring existing loans to interest-only may improve serviceability when applying for new finance.
Timing also matters. If you are self-employed, lodging your most recent tax return before applying, particularly if it shows improved income in the prior year, can be the difference between approval and a decline.
Getting an Accurate Picture
An online borrowing power calculator is a starting point, not a definitive answer. At ALIC, we assess your full financial position across our panel of over 40 banks and lenders, giving you an accurate picture of what is genuinely available and from which lenders, before you commit to anything. Knowing your real position before you begin searching means you can move with confidence when the right property comes along.
Speak with an ALIC lending specialist today at alic.com.au to find out your true borrowing power across 40+ lenders.
