Hobby or Business? How the ATO Decides (And Why It Matters for Tax)
Not sure if your side hustle is a hobby or business? How the ATO decides, what taxes apply, and how to protect yourself, with real examples.
By Timothy Hirou GaschereauPublished 9 min read
This article is general information only and does not constitute tax advice. This is part of a wider guide to crypto and alternative income on Snowball Invest.
Quick answer
There's no magic income number that flips your hobby into a business. The ATO uses a "weight of evidence" test, profit intent, regularity, scale, organisation, and public advertising all matter. Hobby income doesn't need to be declared, business income absolutely does, no exceptions, and your classification can change over time without anyone telling you.
In this guide
- →Why the ATO's test has nothing to do with how much you earn
- →Five real profiles, from candle selling to content creation, and how the ATO would likely call each
- →The tax differences that actually matter, laid out side by side
- →How a hobby quietly becomes a business, and the signs to watch for
- →How to document your activity to protect yourself either way
🎯 It's not about how much you earn
There's no income threshold that automatically makes your activity a business. The ATO doesn't care if you made $500 or $50,000, what matters is how you're doing it. A business generally involves a set of continuous and repeated activities done for the purpose of making a profit, a hobby is a pastime for recreation or personal enjoyment, even if money changes hands.
🎯 The essential: It's a "weight of evidence" approach. No single factor is decisive, the more of profit intent, regularity, scale, businesslike organisation and public advertising that apply, the more likely it's a business.
🧩 Five real profiles
The Etsy seller: selling a few candles around Christmas with no marketing or records is a hobby. Posting on Instagram, running a Shopify store, reinvesting profits and tracking expenses is a business.
The weekend coach: covering petrol for coaching your kid's team is closer to a volunteer reimbursement than a hobby. Coaching multiple teams, invoicing monthly and holding accreditation is a business.
The photographer: shooting friends' weddings as a favour, charging just enough to cover costs, is a hobby. Running a booking system, advertising, and shooting regularly for a set fee is a business.
The sneaker reseller: flipping a pair four times a year for fun is likely a hobby or isolated transaction. Systematic buying, a dedicated store and pricing tools is a business, and GST registration becomes mandatory past $75,000 turnover.
The content creator: posting for fun with occasional gifted products is a hobby. Joining a monetisation program, negotiating paid brand deals and posting on a consistent schedule points toward a business, the ATO's own guidance notes that monetising content you created is a concrete trigger for reassessing your classification.
⚖️ The key tax differences
| Hobby | Business | |
|---|---|---|
| Declare income? | No | Yes, all of it |
| Claim deductions? | No | Yes, business expenses are deductible |
| ABN required? | No, not eligible | Not compulsory, but practically essential |
| GST registration? | Not applicable | Required once turnover hits $75,000/year |
Once your activity is confirmed as a business, another clock starts too, cross $75,000 in turnover and GST registration becomes mandatory. On top of that, if a business pays you and you haven't provided an ABN, they're legally required to withhold 47% of the payment. If you're genuinely a hobbyist selling to another business, a Statement by Supplier form lets you avoid that withholding. Full detail in our ABN guide.
📈 When your hobby grows into a business
Classification can change over time, and there's no formal notification process, it's on you to notice. Watch for: you start advertising publicly, you open a dedicated bank account, you register a business name or ABN, you're invoicing regularly, or you're reinvesting profits to grow the activity. Two or three of these applying is worth taking seriously.
🗂️ How to document your activity
If you're a hobby, keep basic records of what you make and spend anyway, in case your circumstances change later, and don't get an ABN, you're not eligible and it signals the wrong thing to the ATO. If you're a business, open a separate bank account, get a free ABN, keep invoices and receipts for at least five years, and track your GST turnover monthly as you approach $75,000.
💼 Side Hustle Tax in Australia
The full framework for what you actually have to declare, and what you can deduct.
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❓ Frequently asked questions
I made $3,000 selling things online. Do I have to declare it?
+
It depends entirely on whether the ATO would classify your activity as a business. Occasional selling with no profit intent or marketing is likely a hobby. Regular, systematic selling with advertising is probably a business, and every dollar needs declaring.
Can I have a hobby that makes money without paying tax?
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Yes. Genuine hobby income isn't assessable under Australian tax law, as long as the activity is genuinely driven by recreation or personal enjoyment rather than commercial intent.
I've been treating my side hustle as a hobby for years. What happens if the ATO disagrees?
+
If reclassified as a business, you could owe back taxes on undeclared income, plus interest and potentially penalties, for up to five years or more in cases of suspected fraud. Keeping records even as a hobbyist is smart insurance.
Do I need an ABN if I'm just selling on Facebook Marketplace or Gumtree?
+
Not if it's a genuine hobby. If you're running what the ATO would consider a business, regular sales, profit intent, systematic buying to resell, you should have one.
When do I have to register for GST?
+
Only if you're in business and your GST turnover hits $75,000 or more in a 12-month period. Hobbies don't register for GST at all.
📚 Recommended reading
The Barefoot Investor
Scott Pape
Australia's best-selling money book ever. A simple system for accounts, budgeting, debt and a real emergency fund in one.
Some links above are affiliate links. If you buy through them, Snowball Invest may earn a small commission at no extra cost to you. We only recommend books we'd suggest anyway.
Sources
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Timothy Hirou Gaschereau
Founder of Snowball Invest, not a financial adviser.
I write about what I'm learning myself, because nobody ever taught us how to take control of our own money. It's a skill, not a mystery, and it's never too late to learn it. The best day to start was yesterday, the second best is today.
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