The first question almost every buyer asks. Before you fall in love with a place in Cottesloe or start comparing house-and-land packages in Alkimos, you want to know one thing: what can I actually borrow?
The honest answer is that it depends on more factors than most people expect. This article breaks down how lenders calculate your borrowing capacity, why online calculators give you a starting point and not a final answer, and what you can do to improve your position before you apply.
What Online Mortgage Calculators Can (and Can’t) Tell You
A home loan calculator is useful. It gives you a rough range based on your income and a generic set of assumptions. Plug in your salary, pick a loan term, and you’ll get a ballpark figure in seconds.
But that’s all it is. A ballpark.
Online calculators don’t know your actual spending habits. They don’t account for your credit card limits, your HECS debt, how many dependants you have, or which lender you end up applying with. Two people with identical salaries can have borrowing capacities that differ by $100,000 or more depending on those details.
Use a mortgage calculator to understand the rough range you’re in. Then talk to a broker to find out where you actually sit.
What Lenders Actually Look At
When a lender assesses your home loan application, they’re running a serviceability test. Put simply: can you afford this loan, with a buffer built in?
The main factors they assess include:
- Gross income – your salary before tax, including regular overtime, rental income, and certain allowances. Variable income like commissions and bonuses is usually assessed at a reduced rate.
- Existing debts – personal loans, car loans, and credit card balances. Even cards you never use count against you based on their limit, not their balance.
- Living expenses – this is where most people underestimate things. Lenders use either your declared expenses or a benchmark figure, whichever is higher.
- Dependants – each child or dependent reduces your assessed capacity.
- The serviceability buffer – lenders add 3% on top of the actual loan rate. If you’re applying at 6.5%, they test your ability to repay at 9.5%. This is a regulatory requirement set by APRA.
It’s the combination of all these factors that determines your borrowing capacity, not your salary alone.
The HEM: The Number Most Borrowers Haven’t Heard Of
The Household Expenditure Measure (HEM) is a benchmark figure lenders use to estimate what a household of your size and income level would reasonably spend each month.
If your declared living expenses come in below HEM, most lenders will use HEM instead. This can significantly reduce the borrowing capacity shown by a basic calculator.
HEM figures vary by household size and income level. A couple with two children will have a different HEM applied than a single applicant. Lenders don’t publish their exact thresholds, but a broker who works across multiple lenders will have a solid feel for how each one applies it.
This is one key reason why two lenders can quote very different maximum loan amounts for the same application.
Why Different Banks Give You Different Numbers
There’s no single answer to “how much can I borrow” because every lender has its own credit policy. The same application can produce meaningfully different results depending on who you apply with.
Some lenders are more generous with how they assess rental income. Others are stricter about HECS. Some include overtime in full; others cap it at a percentage. Some apply a more conservative version of HEM; others use figures that more closely match actual spending patterns.
This is why shopping the right lender matters as much as getting the right rate. You want the lender whose policies suit your financial situation, not just the one with the lowest number on a comparison site.
For a closer look at how lenders assess different income types and what that could mean for your situation, read more about how much you can borrow for your mortgage.
Practical Ways to Boost Your Borrowing Capacity
A few changes before you apply can make a real difference to what lenders will offer.
- Close unused credit cards. Lenders count limits, not balances. A $10,000 card you never touch still reduces your capacity. Cancelling it before you apply is often one of the quickest wins.
- Pay down small personal loans or car loans. Every existing debt reduces the room available for a mortgage.
- Show a genuine savings history. Consistent saving signals financial discipline, which lenders view positively.
- Reduce reliance on variable income. If commissions or bonuses make up a big part of your income, some lenders discount this heavily. A broker can match you with lenders who treat it more favourably.
- Stabilise your employment. Most lenders want at least six months in your current role, or two years of financials if you’re self-employed.
None of these are instant fixes. But if you’re planning to buy in the next six to twelve months, they’re worth acting on now.
Borrowing in the Perth Market Right Now
Perth property prices have moved significantly over the past few years. According to REIWA, the Perth median house price has pushed past $700,000. In established western suburbs or inner-north areas, you’re often looking at $900,000 or above for a family home.
That gap between borrowing capacity and purchase price is real for many buyers in Western Australia. It often means a longer savings runway, a compromise on location, or a closer look at options like new estates where prices can still be more accessible.
It’s also worth knowing that Western Australia has specific first home buyer support. The First Home Owner Grant offers $10,000 for eligible new builds, and there are transfer duty (commonly called stamp duty) concessions available for first home buyers. These don’t increase your borrowing capacity directly, but they reduce the cash you need upfront, which affects your overall position.
Get Your Actual Number, Not a Calculator Estimate
A proper borrowing capacity assessment looks at your full financial picture and matches it to the right lender for your situation. That’s something a calculator can’t do.
Our brokers at Strategic Mortgages work with buyers across Perth every day. We can assess your capacity, identify which lenders suit your profile, and give you a clear picture of where you stand before you start making offers.
Speak to a Perth home broker today.
Frequently Asked Questions
How is borrowing capacity calculated in Australia?
Lenders assess your income, existing debts, living expenses, and dependants, then apply a 3% serviceability buffer above the actual loan rate as required by APRA. Each lender applies its own credit policy, so results vary between banks and non-bank lenders.
Do online mortgage calculators give accurate results?
They give a general estimate based on income and standard assumptions. They don’t factor in credit card limits, HECS debt, lender-specific policies, or the HEM benchmark. Use them as a guide, not a number to plan around.
Why do different lenders offer different borrowing amounts?
Every lender has its own rules around variable income, rental income, HECS, dependants, and living expenses. The same application can produce significantly different results depending on which lender you approach.
What is the HEM and how does it affect my borrowing capacity?
The Household Expenditure Measure is a benchmark lenders use for living expenses. If your declared expenses are below HEM, the lender substitutes HEM instead. This can reduce your capacity compared to what a basic calculator shows, particularly for applicants who spend conservatively.
Can I increase my borrowing capacity before applying?
Yes. Closing unused credit cards, paying down personal loans, and building a consistent savings history are among the most effective steps. Speaking with a broker three to six months before you plan to apply gives you time to make adjustments that could improve your outcome.
Disclaimer: The information provided in this article is general in nature and does not constitute financial, tax, or legal advice. Individual circumstances vary. We recommend consulting with qualified professionals before making financial decisions.
