Supplementing your taxable income in Australia — through investments, side businesses, rental income, or passive income streams — has significant tax implications. In 2026, any additional income must be declared in your tax return, and the tax treatment varies depending on the source. At the same time, understanding how to structure additional income can help you minimise the additional tax you pay. Here is the complete guide.

Sources of Supplementary Income — and How They Are Taxed

Freelancing and Contracting Income

Income from freelance work, consulting, tutoring, or other personal services is assessable income taxed at your marginal rate. If your total income exceeds $75,000, you may also need to register for GST. You can claim deductions for expenses directly related to earning the income: home office, equipment, professional development, and professional indemnity insurance.

Investment Income: Shares, Dividends, and Interest

Dividends, bank interest, and managed fund distributions are all assessable income at your marginal rate. Dividends from Australian companies come with franking credits — these credits reduce your overall tax liability and can result in a refund if your marginal rate is lower than 30%. Capital gains from shares are also taxable, with the 50% CGT discount available for assets held more than 12 months.

Rental Income

Rental income from investment properties is assessable. All legitimate expenses (interest, rates, insurance, management fees, depreciation) are deductible. If expenses exceed income (negative gearing), the net loss reduces your other taxable income — providing a tax benefit while building a long-term asset.

Gig Economy and Platform Income

Income from Uber, Airbnb, Airtasker, Fiverr, Etsy, and similar platforms is fully assessable. Uber and other ride-sharing drivers must register for GST from the first dollar of income (no $75,000 threshold). Airbnb hosts can deduct expenses apportioned to the rental period. The ATO receives data from all major sharing economy platforms under its data matching program.

Tax Strategies to Manage Additional Income

  • Salary sacrifice into super: Reduce your taxable income by diverting employment income into super at 15% tax
  • Timing of income: If you are near a tax bracket threshold, consider deferring income to the next financial year
  • Invest in your own name vs trust vs company: The structure you use to earn additional income affects the tax rate — a company pays 25% (base rate entities) while individuals may pay 47%
  • Prepay deductible expenses: Prepaying income protection premiums, investment loan interest, and subscription costs before 30 June can bring deductions into the current year

Frequently Asked Questions

Do I need to declare Airbnb income on my tax return?

Yes. Airbnb and similar short-term rental income is fully assessable. You can deduct expenses apportioned to the period the property was rented (rates, mortgage interest, insurance, cleaning, platform fees, depreciation). The main residence CGT exemption is also partially reduced for periods when the property is rented — keep accurate records of rental vs personal use days.

Do I need an ABN to earn side income?

You need an ABN if you are carrying on a business — including freelancing or contracting regularly. A one-off payment or occasional activity may not constitute a business. Without an ABN, payers are required to withhold 47% of payments (the top withholding rate). Having an ABN allows you to invoice correctly and potentially register for GST when turnover exceeds $75,000.

Earning additional income in 2026? Contact AWTS to structure your income tax-effectively and ensure full compliance with ATO reporting obligations.