How to Maximise Your Tax Return in Australia: Every Deduction Worth Claiming (2026)

The ATO applies three tests to every deduction - understanding them prevents both under-claiming and audit risk:

• You must have spent the money yourself: You cannot claim reimbursed expenses. If your employer paid for something, or you received an allowance that covered the cost, the deduction is reduced or eliminated accordingly.
• The expense must be directly related to earning your income: Personal expenses are not deductible. If an expense has both work and private components (a phone used for work and personal calls), you can only claim the work-related proportion.
• You must have a record to prove it: Receipts, bank statements, credit card statements, or a substantiated diary record. For expenses over $300 combined, written evidence is required. For car expenses under the logbook method, a 12-week logbook is needed. The ATO pre-fills some data but it does not exempt you from keeping records.

The largest deduction category for most employees - and the most frequently under-claimed:

• Home office expenses: Two methods. The fixed rate method: 67 cents per hour for every hour worked from home in 2025–26. This covers electricity, internet, phone, stationery, and computer consumables. Keep a record of hours worked at home (a diary or timesheet). The actual cost method: calculate the real work-related proportion of actual costs - requires detailed records and is more complex but may return a larger deduction for high-use home offices.
• Vehicle and travel expenses: If you use your personal vehicle for work purposes (travelling between work sites, client visits, carrying equipment) - not the commute from home to your regular workplace - you can claim. Cents per kilometre method: 88 cents/km for 2025–26 (ATO rate), up to 5,000km per year, no logbook required. Logbook method: for higher business use, keep a 12-week logbook and claim the business proportion of all vehicle costs (fuel, registration, insurance, depreciation).
• Tools, equipment, and technology: If you purchase tools, equipment, or technology required for work and your employer does not reimburse you: items under $300 are immediately deductible; items over $300 are depreciated over their effective life. Laptops, phones, cameras, and professional equipment used for work all qualify for the work-use proportion.
• Clothing and laundry: Only occupation-specific clothing (uniforms with a logo, protective clothing required by the job, specific safety clothing) - not conventional clothing you choose to wear to work. Laundry of qualifying work clothing: $1/load (mixed) or $0.50/load (work-only items) without needing receipts, up to $150 total.
• Self-education and professional development: If directly related to your current employment - not for general advancement or a career change. Courses, textbooks, conference registrations, professional subscriptions, and union fees all qualify.
• Other work expenses: Mobile phone (work proportion), internet (work proportion), professional association memberships, technical journals, and home office furniture and fittings (work proportion, depreciated).

Investors can claim a range of expenses related to income-producing assets:

• Investment loan interest: Interest on loans used to purchase income-producing assets (shares, investment property) is fully deductible. If the loan was used for mixed purposes, only the investment portion is deductible. Keep clear records of how borrowed funds were used.
• Investment property expenses: For rental properties, deductible expenses include: interest, council rates, strata levies, landlord insurance, property management fees, repairs and maintenance (not capital improvements), cleaning, and gardening. Depreciation on the building (Div 43) and fittings (Div 40) requires a quantity surveyor's report but can add thousands in deductions annually.
• Financial advice fees: Tax advice and investment advice fees related to managing existing investments are generally deductible. Initial financial planning fees for setting up a financial plan are not (they are capital in nature). The distinction matters - ask your adviser to break invoices into deductible and non-deductible components.
• Income protection insurance premiums: Fully deductible when held outside superannuation. One of the most consistently overlooked deductions - a $2,400 annual premium at a 37% marginal rate generates an $888 tax saving.
• Dividend reinvestment plans: When you reinvest dividends under a DRP, the reinvested amount is assessable income in the year of reinvestment - but also becomes part of your cost base for future CGT calculations. Keep records of all DRP reinvestments.

Timing deductions and income around 30 June can significantly affect your refund:

• Prepay deductible expenses before 30 June: Investment loan interest, income protection premiums, professional subscriptions, and other deductible costs can be prepaid up to 12 months in advance and deducted in the current year. This brings forward the deduction to the current tax year.
• Make super contributions before 30 June: Concessional contributions (deductible for self-employed; reducing taxable income via salary sacrifice for employees) must be received by the fund before 30 June to count for that financial year. Allow 2–3 business days for processing.
• Defer income where possible: If you have control over when income is received (self-employed, bonuses), deferring income to the next financial year delays the tax obligation by 12 months and may benefit from a lower rate if your income will be lower next year.
• Realise capital losses before year-end: If you hold investments with unrealised losses, selling before 30 June allows you to offset those losses against any capital gains realised in the same year, reducing your CGT liability.

These errors consistently result in smaller refunds or unnecessary tax liabilities:

• Not claiming the home office deduction: Since COVID normalised working from home, the home office deduction has become material for many Australians - yet many do not claim it. Even 3 days/week from home for 48 working weeks equals 144 hours × 67c = $96 - but for full-time home workers the amount is much larger.
• Forgetting bank interest and dividend income: The ATO pre-fills most of this data from financial institution reporting. Not including it is an error - and the ATO cross-checks. Equally, forgetting franking credits attached to dividends means forgoing refundable tax offsets.
• Missing the spouse super contribution offset: Contributing to a spouse's super fund where they earn under $37,000 generates an 18% tax offset on contributions up to $3,000 - a $540 tax reduction for $3,000 contributed.
• Not lodging on time: Lodging through a registered tax agent gives you until 15 May the following year (vs 31 October for self-lodgers). Failure to lodge on time accumulates a Failure to Lodge penalty of $330 per 28-day period, up to $1,650.

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