Side Hustle Tax Mistakes Every Australian Should Avoid
Starting a side hustle has become one of the most popular ways Australians earn extra income. Whether you're driving for Uber, freelancing online, selling handmade products on Etsy, tutoring students, or creating content on social media, a side hustle can provide valuable financial support during rising living costs.
If you're only earning a bit of extra money outside your regular job, it's easy to assume it doesn't really matter at tax time. In many cases, though, that income still needs to be declared. Understanding the rules from the start can help you avoid unexpected tax bills later.
Here's a look at the most common side hustle tax mistakes Australians make, and how to avoid them.
Common Side Hustle Tax Mistakes
1. Thinking Small Earnings Don't Need to Be Declared
Many Australians assume they only need to declare side hustle income once it reaches a certain amount. Unfortunately, that's not how Australia's tax system works.
Whether you're paid by bank transfer, cash, PayPal, Stripe, or another online platform, your earnings may still be taxable if they form part of a business or income-earning activity.
Real example
Sarah picks up freelance design work on Fiverr after hours to earn a bit of extra money. By the end of the financial year, she's made $3,800. She assumes it's too little to include in her tax return, but later discovers that the income still needs to be declared.
2. Confusing a Hobby With a Business
Not every money-making activity is automatically considered a business.
The ATO looks at several factors, including whether you intend to make a profit, how regularly you sell products or services, whether you advertise, and whether your activity is organised in a business-like manner.
Real example
Tom didn't set out to start a business. He simply enjoyed making candles in his spare time. After friends encouraged him to sell them, he opened an Etsy shop and started sharing his products on Instagram. As sales became more regular, his hobby gradually turned into a business, bringing tax obligations.
3. Not Keeping Proper Records
Good record keeping is one of the easiest ways to reduce stress at tax time.
You should keep records of:
Income received
Invoices
Receipts
Equipment purchases
Software subscriptions
Phone and internet expenses (where applicable)
Vehicle expenses if they're directly related to earning income
Real example
Emily spends more than $1,500 on a new laptop, design software, and online subscriptions for her freelance work. Because she didn't keep the receipts, proving her deductions becomes much more difficult during tax time.
4. Forgetting to Set Money Aside for Taxes
Unlike regular employment, many side hustles don't have tax automatically withheld from payments.
This means it's your responsibility to budget for your future tax liability.
Real example
Jason earns $12,000 during the year photographing weekend events. Since no tax is withheld from his payments, he spends all of the income as he earns it. When he lodges his tax return, he receives an unexpected tax bill because he hadn't set aside any money.
A simple strategy is to regularly transfer a portion of your side hustle income into a separate savings account to help prepare for tax time.
5. Missing Legitimate Tax Deductions
Many side hustle owners focus on declaring income but forget they may also be entitled to claim eligible business expenses.
Home office expenses
A portion of your phone and internet bills used for work
Computers, laptops, and other work-related equipment
Software and online subscriptions
Advertising and marketing costs
Professional memberships and subscriptions
Business insurance
Courses or training that directly relate to your side hustle
Remember, expenses generally need to be directly connected to earning your assessable income, and you'll need records to support your claims.
6. Not Getting an ABN When Required
If your side hustle operates as a business, you may need an Australian Business Number (ABN).
Having an ABN can make it easier to invoice clients, present yourself professionally, and meet your tax obligations.
Real example
A freelance graphic designer is starting to pick up regular work from local businesses but hasn't applied for an ABN. After one of the clients asks for an ABN before paying future invoices, the designer realises it's time to register and get everything set up properly.
7. Ignoring GST Obligations
Many people assume GST applies to every side hustle, but that's not always the case.
GST registration generally depends on your business turnover. If your income grows over time, it's important to understand when registration becomes necessary and what additional reporting obligations may apply.
Regularly reviewing your turnover can help ensure you remain compliant as your side hustle expands.
Don't Assume the ATO Won't Notice
Today's digital economy leaves a trail.
Many online platforms, payment providers, and financial institutions share information with the ATO through data-matching programs. Whether you're driving for a rideshare service, selling products online, or earning freelance income, assuming your earnings go unnoticed can be an expensive mistake.
Staying organised throughout the year is far easier than trying to reconstruct records when tax time arrives.
Final Thoughts
A side hustle is a great way to earn some extra income and, for many people, it can even grow into a full-time business. But it's important to understand that earning extra money also comes with tax responsibilities. By declaring your income, keeping good records, and claiming the deductions you're entitled to, you can avoid unnecessary stress and unexpected tax bills at tax time.
Want to learn more about the tax-free threshold, managing multiple jobs, or understanding your Australian tax obligations? Visit the Clear Tax blog for practical, easy-to-follow guides covering tax returns, deductions, ABNs, GST, side hustles, and other tax topics to help individuals and businesses stay compliant and make informed financial decisions.

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