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.

Side Hustle Tax Mistakes - Clear Tax



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

Mistake

Why It's a Problem

How to Avoid It

Not declaring side hustle income

Can result in tax adjustments and penalties

Report all taxable income in your tax return

Treating a business as a hobby

You may overlook your tax obligations

Understand the ATO's hobby vs business guidelines

Poor record keeping

Makes it difficult to claim deductions

Keep digital receipts, invoices, and expense records

Spending all your earnings

You may not have money available to pay tax

Set aside a portion of your income throughout the year

Missing eligible deductions

You could pay more tax than necessary

Track work-related expenses connected to your income

Not getting an ABN when required

May create issues when invoicing clients

Apply for an ABN if you're operating a business

Ignoring GST obligations

Can lead to compliance issues if thresholds are met

Monitor your turnover and GST registration requirements

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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