How much is it safe to borrow, really?

Even though mortgage regulators are cracking down on how much banks are lending, chances are they will still extend you too much, writes Nicole Pedersen-McKinnon.

“How much can I borrow?” It’s a question I get asked all the time… and it’s the wrong one. The right one is: “How much should I borrow.” Because, even though mortgage regulators are cracking down on how much banks are lending, chances are they will still extend you too much. And it’s tempting, when you’ve found the property that makes your heart skip a beat, to close your eyes and take them up on it… without any thought for the wallet-walloping consequences. UNO/">How much can I borrow?Use UNO's calculator to estimate your borrowing capacity. Calculate Now

How much is too much?

How much you can safely borrow comes down to three very simple factors: the size of your deposit (and additional cash for costs), the size of your (possibly combined) pay packet and your expenses. Let’s start with that elusive deposit (or the equity you have in an existing home when refinancing). Ideally, you’d never make a real estate move without a 20% deposit. I say this because, not only does it give you a nice margin of safety if prices dip, it means you escape the rort that is lenders’ mortgage insurance. This is insurance for which you pay the premiums but from which a lender gets the protection. Rampaging property prices in recent years, however, have made a 20% deposit a huge challenge for first homebuyers. Still, it isn’t wise to even think about leaping into the property market without a 10% deposit (and enough cash for costs, including a few thousand extra dollars for the requisite lenders’ mortgage insurance). “But how do you know what a 10% deposit is?” I hear you ask. Easy – you multiply your savings as they grow by 10 until you get a figure large enough to buy something somewhere you’d think about living. So if you had $30,000 allocated for the deposit, you could consider paying up to $300,000 for a property. If you had $70,000, you could possibly go up to $700,000. If you’re a first-time buyer, you should stop roughly between a hovel and a stately home. But it’s not just about the deposit and potential property value; there’s another vital test you need to perform to sanity check how much this means you’d be borrowing. The reason is that interest rates are currently so low as to be – ironically – dangerous.

Crunching the final numbers

Contrary to popular belief, the key to your homeowner comfort is not plush couch cushions or designer bathrobes, but capping your borrowings such that you can sleep blissfully at night. To do that you need to familiarise yourself with a concept called mortgage stress, which – as implied – you never want to experience.

Thanks to the larger loans Aussies are taking out just to get a foot on the property ladder, the severe mortgage stress felt in the late ‘80s and early ‘90s would today be experienced at an interest rate of just 8%. Mortgage stress occurs when interest rates rise to such an extent that you find yourself tipping more than one-third of your before-tax household income into your home loan. You want to give yourself enough breathing space to ensure that never happens. It might seem unnecessary when rates could well stay at these historic lows for a good while yet and then rise only slowly? Point taken. But remember, they increased six times in just eight months after the world nearly fell off a financial cliff thanks to the credit crack up. And forget what you’ve heard about the 17% interest rates of the late ‘80s and early ‘90s. Thanks to the larger loans Aussies are taking out just to get a foot on the property ladder, the severe mortgage stress felt then would today be experienced at just 8%. Now that I have your attention, the final step to finding your safe borrowing ceiling is figuring out the loan repayments you’d need to make if you borrowed what the above deposit test suggested. Just multiply your annual before-tax salaries by 0.3333, then divide the result by 12. So if you bring home $150,000, you would get $49,995, divided by 12 – or $4166. This gives you the amount you should be able to comfortably afford to pay each month. But you also want to mortgage ‘stress test’ this for rate rises. We’ll use the $70,000 deposit and a potential $700,000 property. Use UNOs’ online repayment calculator and plug in a competitive 4% rate for a loan of $630,000 with no fees… at $3325, you should be able to cover monthly principal and interest repayments without a problem. But what if rates rose to 7%, or more than $1200 extra a month? You’d be nearly $400 into mortgage stress. So the sensible move would be to reduce what you borrow to keep safe in the event of a 3 percentage point rate rise: $590,000. Lenders are now supposed to do this for you. But there’s no one with your best financial interests more at heart – forget how much you love a property – than you. This information is general in nature and you should always seek professional advice when making financial decisions. How much can I borrow?Use UNO's calculator to estimate your borrowing capacity. Calculate NowBook in a quick call with our customer care teamNicole Pedersen-McKinnon is a commentator and educator who presents her Smart Money Start*, fun financial literacy incursion,** in high schools around Australia. Follow Nicole on Facebook at [Nicole Pedersen-McKinnon Money**](https://www.facebook.com/NicolePedersenMcKinnonMoney/). * Book a call in with UNO
5 stars for our service reviews from clients

Book Call Now

UNO home loans

Try Plans, by UNO
Mortgage calculators completely reimagined
Get Started
Considering a purchase or refinance?

Try Plans by UNO

Mortgage calculators completely reimagined
Get Started
☎️ 🚫 No cold call promise

Related Articles

TESTIMONIALS

What our customers are saying

Alice V
December 5, 2025
5 stars for our service reviews from clients
great experience - very supported throughout the whole mortgage arrangement process
Read more
Cassie Ninness
December 1, 2025
5 stars for our service reviews from clients
Jake was fantastic when refinancing our home loan. The whole process was made so easy by Jake who had a lot of knowledge, was attentive and kept us well informed through the whole process. Such an easy and positive experience and I would recommend him and his services to anyone.
Read more
Kobe Ferguson
November 29, 2025
5 stars for our service reviews from clients
I had the absolute pleasure of working with Jake de Ruyter on our home loan application, and I couldn’t recommend him highly enough to anyone looking to finance a new home. From his lightning-fast response times to his extensive knowledge across every stage of the process, Jake has been a breath of fresh air during what can be a very stressful period. He made sure we understood each step clearly and took the time to explain anything we weren’t familiar with in a way that genuinely made sense. Jake went above and beyond to find the best option for our specific situation, and his dedication has truly set him apart. We will absolutely be using Jake for all future finance needs. Highly recommended
Read more
Riley Nicoll
November 29, 2025
5 stars for our service reviews from clients
My partner and I have just bought our first home and Jake de Ruyter helped us arrange our finance. Jake was an absolute pleasure to deal with. He made the process smooth, stress-free, and straight-forward. He displayed professionalism and open communication throughout the process and was quick to act on every piece of correspondence. We are so happy and will 100% be doing all our future finance through Jake.
Read more
Chris Whiteman
November 29, 2025
5 stars for our service reviews from clients
We chose Paul as our mortgage broker because, as fellow Kiwis, we wanted someone who truly understood us and how we work - and we’re so glad we did. His communication was exceptional from start to finish, always quick to respond (even to our many questions!) and incredibly clear throughout the entire process. Paul secured our loan super quickly and guided us through each step with confidence and ease. Buying a home in Australia can feel overwhelming, but he made everything feel straight forward and stress-free. We would recommend Paul all day long to anyone looking to purchase a home in Australia, and we will absolutely use him again when the time comes. Thank you, Paul - you’ve been amazing.
Read more
Josh Rochford
November 28, 2025
5 stars for our service reviews from clients
Paul and the Team and UNO were fantastic. Very informative and extremely efficient.Highly recommend. Thanks again Paul
Read more
Kealan Kelly
November 27, 2025
5 stars for our service reviews from clients
Mike and team were an absolute pleasure to work with. Super friendly and professional throughout and got us excellent rates
Read more
W S Lam Wong
November 27, 2025
5 stars for our service reviews from clients
When seeking for a loan for my unconventional lending requirements (via a trading trust), none of the Big 4 nor regular brokers could help. I'm glad I found Jesse who has a thorough understanding of my requirements and it has been a pleasant and seamless experience to have my loan organised by Jesse until settlement. A well deserved 5 stars review from me!!!
Read more
Haylee Hollings
November 26, 2025
5 stars for our service reviews from clients
Paul was amazing from the first phone call, he knew what we needed to know before we had even thought about it.. He and his team had us feeling at ease moving from Another country knowing he had us sorted and under control and in good hands. Paul will be our go to for other financial needs in the near future! Thanks again Paul and the team! Thankful kiwis!
Read more
Claire Blackall
November 26, 2025
5 stars for our service reviews from clients
Highly Recommend Paul Davey – Exceptional Mortgage Broker We worked with Paul Davey on a very complex mortgage application, and we honestly couldn’t have asked for a better broker. Paul worked incredibly hard for us from start to finish — he was patient, knowledgeable, and relentless in finding solutions when things got complicated. His communication was outstanding, always keeping us updated and making sure we understood every step of the process. It’s clear he truly cares about his clients and goes above and beyond to achieve the best outcome. We’re extremely grateful for everything Paul did for us and would recommend him without hesitation to anyone looking for a dedicated and trustworthy mortgage broker.
Read more
H Hollings
November 26, 2025
5 stars for our service reviews from clients
Paul is absolutely fantastic, he is absolutely worth reaching out to! He explains things in ways you can understand and help you get or work towards what you are wanting to achieve. You won’t regret reaching out to him and his team at all!
Read more
Owen
November 26, 2025
5 stars for our service reviews from clients
Paul and the team at UNO are excellent, very responsive with sound knowledge, highly recommend.
Read more