Tax on Side Hustle Income Australia 2026: What You Owe and How to Reduce It

There is a widely believed myth that you only need to declare side hustle income above $10,000 in Australia. It is completely wrong. Every dollar you earn from a side hustle is assessable income, regardless of whether you're driving for Uber, renting on Airbnb, selling on Etsy, freelancing, tutoring, or creating content. There is no minimum threshold for declaring it. You declare it all, and you pay tax on it at your marginal rate.

The good news is that what counts as taxable income, what you can deduct, and how much extra tax you actually end up paying can look very different depending on how you run your side hustle. Understanding the rules saves money. Ignoring them costs significantly more — the ATO's Sharing Economy Reporting Regime now receives earnings data directly from Uber, Airbnb, Etsy, and other platforms, which means the days of "I'll just not mention it" are over.

Hobby vs. business: the first question to answer

Before any of the tax rules apply, you need to know whether your side activity is a hobby or a business. Income from a genuine hobby is generally not taxable. Income from a business activity is.

The ATO uses several factors to determine which one you're running:

Intention to make a profit: hobbies are done for enjoyment; businesses are run with a genuine expectation of profit
Scale and repetition: making occasional one-off sales is different from regular, systematic activity
Businesslike practices: keeping records, invoicing, having a business plan, marketing your services
Size of the activity: a one-time garage sale is a hobby; ongoing sales through a managed online store is a business

In practice, if you're earning money regularly from the same activity — even small amounts — the ATO is likely to treat it as a business. The clearest sign is that you're taking customer orders, pricing your services, and expecting repeat income. If you're genuinely doing something for fun and occasionally receive money for it (e.g., you make pottery as a hobby and someone pays you $80 for a vase once), that's more likely a hobby.

When in doubt, run through the ATO's hobby vs business tool. Getting this wrong in the wrong direction (treating a business as a hobby) can result in back taxes and penalties.

Do you need an ABN?

If you're running a business — even a small side hustle — you generally need an Australian Business Number (ABN). It's free to apply for via the Australian Business Register and takes minutes.

You need an ABN if you:

Invoice clients for goods or services as a business
Want to claim business-related deductions
Need to register for GST (see below)
Want to avoid clients withholding 47% tax from payments to you (the "no-ABN withholding" rule)

When you might not need one: if you're working as an employee on a second job — say, casual shift work at a second employer — you're paid on a payroll, tax is withheld at source, and you don't need an ABN. The same applies if you're earning income from an employment arrangement where the payer operates PAYG withholding. But if you're invoicing people, selling products, or operating independently, an ABN is the standard expectation.

GST: when your side hustle needs to charge it

Most side hustles only need to register for GST when their turnover exceeds $75,000 per year. At that point, registration is mandatory — and from that date you must add 10% GST to your prices and remit it to the ATO quarterly via a Business Activity Statement (BAS).

Below $75,000, GST registration is optional. Some side hustlers register voluntarily (to claim GST credits on expenses), but most don't — it adds reporting obligations for little gain at low income levels.

The critical exception: rideshare and ride-sourcing drivers

If you drive for Uber, DiDi, Ola, or any other ride-sourcing platform, you must register for GST from the first dollar you earn — no $75,000 threshold applies. This is a specific ATO rule for taxi and ride-sourcing services. You don't need to collect the GST yourself (it's embedded in Uber's fare), but you must be registered, lodge BAS returns, and remit 1/11 of your gross fares to the ATO.

This applies even if you drive Uber on weekends and earn only $500 a month. Register before you start your first trip.

Personal Services Income (PSI): the rule that catches freelancers

If the vast majority of your side hustle income comes from a single client — specifically, if more than 80% of your business income comes from one payer — the ATO's Personal Services Income (PSI) rules may apply.

PSI rules exist to stop individuals from routing their income through a company or trust to reduce tax. Under PSI:

Your income is treated as your personal income regardless of any business structure you use
The deductions you can claim are restricted — you can't claim rent, interest, or costs that aren't directly related to earning that income
You can't split the income with a partner or family member to use their lower tax rate

The 80% test is the most common trigger. If you earn $15,000 from freelancing and $13,000 of that comes from a single client, PSI rules likely apply to you. If your income is spread across multiple clients — none representing 80% or more — you likely fall outside PSI.

PSI rules are complex. If you're earning significant freelance income and are unsure, this is one worth discussing with a tax agent before lodging.

What you can deduct from side hustle income

One of the genuine tax benefits of running a side hustle (compared to just being an employee) is the ability to deduct actual business expenses against your income. These reduce the income the ATO taxes.

Common deductions for side hustlers:

Side hustle type	Deductible expenses
Uber / rideshare	Vehicle running costs (logbook or 88c/km), phone (work %), platform fees, insurance (business portion)
Airbnb host	Proportion of home costs: mortgage interest, rates, electricity, insurance, cleaning, platform fees, repairs to the rental space
Etsy / online seller	Cost of goods, packaging, postage, marketplace fees, home office (if goods stored or made there), equipment
Freelancer / contractor	Home office (70c/hour fixed rate), equipment, phone, software subscriptions, professional association fees
Tutor	Course materials, textbooks, stationery, relevant equipment, home office where lessons are taught
Content creator	Camera, lighting, audio equipment, software, editing tools, props, proportion of phone and internet

The rule across all of these: the expense must have a direct connection to earning your side hustle income, you must have paid it yourself, and you must not have been reimbursed. Personal expenses — even ones incurred partly because of your side hustle — can only be claimed for the work-related proportion.

Use our Income Tax Calculator to model how your side hustle income and deductions affect your total tax bill this year.

PAYG instalments: the tax bill that arrives mid-year

When you're a regular employee, your employer withholds tax from every pay and sends it to the ATO on your behalf. When you earn side hustle income, no one withholds tax on it — and if your total tax payable exceeds a threshold, the ATO places you on the PAYG (Pay As You Go) instalments system.

PAYG instalments require you to pay estimated tax on your business/investment income quarterly — before your annual tax return is even lodged. The payment dates are:

Quarter	Due date
July–September	28 October
October–December	28 February
January–March	28 April
April–June	28 July

The ATO calculates an instalment amount based on your prior year's tax position. If the suggested amount is too high (your income has dropped) or too low (income has risen), you can vary it — but if you vary too aggressively downward and end up owing more than 85% of what you should have paid, a penalty interest rate applies.

If you're new to side hustle income and haven't been placed on PAYG instalments yet, you'll typically face a larger-than-expected tax bill at lodgement time. The smart approach: set aside 30–35% of your side hustle income each month into a separate savings account, so the tax liability doesn't catch you off guard.

Record keeping: the 5-year rule

The ATO requires you to keep records for 5 years from the date you lodge your return (or 5 years from when you made the transaction, whichever is later). This includes:

Income records: all invoices you issued, payment confirmations, platform payment summaries
Expense records: receipts, bank statements, tax invoices for business purchases
Vehicle records: odometer readings, logbook entries, kilometre tallies if using the cents-per-km method
Home office records: diary of hours worked if using the fixed rate method

The ATO's free myDeductions app (in the ATO app) is a practical way to photograph receipts and log kilometres throughout the year. Trying to reconstruct records at tax time without evidence is both stressful and legally risky.

The Sharing Economy Reporting Regime (SERR)

From 1 July 2024, the ATO's Sharing Economy Reporting Regime requires platforms to report your earnings directly to the ATO:

Already reporting: Uber, DiDi, Airbnb, Booking.com, and other large platforms
Reporting from 1 July 2025: all other sharing economy and gig platforms

This means the ATO already has your earnings data before you even lodge your return. If you don't declare it, the ATO's systems will flag the discrepancy.

Worked example: Dev's web design side hustle

Dev earns $75,000 from his full-time IT job and takes on $15,000 in freelance web design work over the year through his ABN.

Combined taxable income before deductions: $90,000

Dev keeps good records and claims $4,000 in legitimate business deductions:

Home office (500 hours × 70c) = $350
Laptop (work portion 70% of $1,200 depreciation) = $840
Software subscriptions (Figma, Adobe, Slack — work only) = $680
Phone (50% of $1,200 annual bill) = $600
Professional development course = $449
Business insurance = $720
Platform fees and subscriptions = $361

Taxable income after deductions: $86,000

	Amount
Tax on $75,000 (day job, estimated PAYG withheld)	$14,842
Tax on $86,000 (after deductions)	$18,417
Medicare levy (2%)	$1,720
Total tax liability	$20,137
Estimated PAYG withheld by employer	approx. $16,342
Extra tax owing on side hustle at lodgement	approx. $3,795

Dev set aside 32% of every freelance payment in a savings account throughout the year — when his bill arrived, the money was already there. He also asked the ATO to put him on quarterly PAYG instalments after that first year so future bills weren't a surprise.

Frequently asked questions

Do I have to declare side hustle income if I earned less than $10,000?

Yes. There is no $10,000 minimum threshold for declaring side income in Australia. All business income — regardless of amount — must be declared in your tax return. The only income that may not be taxable is genuine hobby income (where there's no profit intention and no business activity), but you should still understand the hobby/business distinction before assuming your activity qualifies.

Do I need an ABN to sell things on Facebook Marketplace or Gumtree?

It depends on whether it's a genuine business or just selling personal items. Occasionally selling second-hand personal belongings is generally not a business and doesn't require an ABN or declaration as income. But if you're buying items to resell — arbitrage, flipping goods, or running a regular secondhand operation — the ATO would likely treat it as a business. An ABN is then appropriate.

I drive Uber on weekends. Do I really need to register for GST?

Yes. Rideshare drivers must register for GST from their first dollar of income, regardless of how little they earn. This is a specific ATO rule for taxi and ride-sourcing services that overrides the usual $75,000 threshold. You need an ABN, GST registration, and to lodge BAS returns. The GST is effectively embedded in Uber's fare pricing — you receive the GST component and remit 1/11 of gross fares to the ATO.

What percentage of Airbnb income is taxable?

All Airbnb income is assessable. However, if you rent out only a portion of your home (e.g., a spare room), you can deduct a proportionate share of your home's expenses — mortgage interest, council rates, electricity, insurance, internet — based on the floor area rented and the proportion of the year it was rented. You can't deduct 100% of your home costs if you only rent one room occasionally.

When does the ATO put me on PAYG instalments?

Once you lodge a tax return with more than $500 in tax payable on business or investment income, the ATO typically enters you in the PAYG instalment system. You'll receive an instalment notice before each quarterly due date. You can vary the amount if your income changes significantly from the prior year.

What deductions can Uber drivers claim?

Uber drivers can claim the business-use proportion of their vehicle running costs (fuel, insurance, rego, maintenance, depreciation) using either the logbook method or the cents-per-km method (88c/km, capped at 5,000 km). They can also claim their phone (work proportion), platform fees, and any vehicle cleaning costs directly related to the rideshare service. The key is keeping a logbook for 12 weeks to establish the business-use percentage.

What happens if I don't declare side hustle income?

The ATO receives earnings data directly from major platforms (Uber, Airbnb, Etsy, and others) under the Sharing Economy Reporting Regime. If your return doesn't match the data the ATO holds, it may trigger a review or audit. Undeclared income results in back taxes plus interest (the general interest charge runs at approximately 11% annually) and a shortfall penalty — typically 25% of the unpaid tax for a careless mistake. Voluntary disclosure before being notified of an audit reduces penalties significantly.

Income tax rates, GST thresholds, and PAYG rules in this article are current as at July 2026 for the 2025-26 financial year. The cents-per-kilometre rate of 88c/km applies for 2025-26. This article is general information only and does not constitute financial or tax advice. Individual circumstances vary — consult a registered tax agent for advice specific to your situation.