By Paul Feeney, Founder and Chief Executive Officer, Otivo
The financial mistakes that quietly cost people the most aren't exotic blunders, they're a handful of ordinary, avoidable ones repeated over years. No dramatic gamble required, just a few habits that slowly work against you. The good news is that because they're common and predictable, they're also easy to steer around once you know what they are. Here are the ones worth avoiding.
Quick answer
Common financial mistakes include having no emergency buffer, carrying high-interest debt, starting to save or invest late, going without necessary insurance, and letting spending rise with income. As at July 2026, most of these are avoidable with a few basic habits, and steering around them tends to matter more than any single clever move.
What's the most common financial mistake?
Having no buffer against the unexpected. Without even a small emergency fund, any surprise cost, a car repair, a medical bill, lands on high-interest credit or derails other plans, which is how a manageable setback becomes a lasting one. It's the mistake that makes every other financial goal fragile, because it leaves nothing between you and the next shock. Building a modest buffer is the single habit that prevents a cascade of other problems.
Why is high-interest debt so costly?
Because it compounds against you, the mirror image of how investing compounds for you. Carrying a balance on a high-rate credit card means the debt grows quickly and each minimum payment barely dents it, so the cost mounts month after month. Letting expensive debt linger while directing money elsewhere is a common and costly error, since clearing it usually delivers a guaranteed saving that few investments can match. Prioritising high-interest debt avoids one of the steepest ongoing costs there is.
What's the cost of not starting early?
Lost time, which is the one thing you can't recover. Because compounding builds slowly then accelerates, delaying saving or investing, or leaving super unexamined for years, forfeits growth that early contributions would have captured. Waiting for the perfect moment or a higher income often means missing the years when time would have done the most work. Starting modestly but early generally beats starting larger but late, which is why delay is such an expensive mistake.
What about going without insurance?
It leaves a serious risk sitting entirely on you and your dependants. Skipping appropriate cover, or assuming default insurance in super is enough without checking, can mean a death, disability or extended illness turns into a financial catastrophe for a household. The premium saved is small against the risk carried. Making sure essential cover is in place, and reviewing it, avoids one of the mistakes whose cost, though rare, can be devastating when it lands.
How does lifestyle creep undermine you?
Quietly, by letting spending rise in lockstep with income so you never get ahead. Each pay rise gets absorbed into a slightly bigger lifestyle, leaving your savings rate flat despite earning more. Add the absence of any plan tying your money to goals, and years can pass with little to show for a growing income. Directing at least part of every income increase towards saving, rather than spending, is how you turn earning more into being better off.
Frequently asked questions
What is the biggest financial mistake people make?
Having no emergency buffer is among the most common and damaging, since it leaves every other goal exposed to the next surprise. Carrying high-interest debt runs a close second for its ongoing cost.
Why is starting late a financial mistake?
Because compounding rewards time, so delaying saving or investing forfeits growth that early contributions would have captured. Starting modestly but early generally beats starting larger but late.
How do I avoid lifestyle creep?
By directing part of every pay rise towards saving rather than letting spending expand to match your income. Tying your money to specific goals also helps ensure earning more translates into being better off.
Where to from here
Avoiding a few common mistakes often matters more than any single clever move. Otivo, a licensed Australian financial advice platform holding AFSL and Australian Credit Licence No. 485665, offers a retirement planning module and other tools that help you spot and close the gaps in your position, based on your income, debts, age and goals. It helps you steer around the avoidable pitfalls.
Sources
- ASIC MoneySmart — common money mistakes and how to avoid them — moneysmart.gov.au
Disclaimer
The information in this communication is current as at July 2026 and has been prepared by Otivo Pty Ltd ABN 47 602 457 732, AFSL and Australian Credit Licence No. 485665. This content is general information only and has been prepared without taking into account your objectives, financial situation or needs. It is not personal financial or taxation advice and should not be relied on as such. Before acting on any information, you should consider its appropriateness having regard to your personal circumstances. This material must not be reproduced in whole or in part, or posted on any social media platform, without the prior written consent of Otivo Pty Ltd.