How to Legally Pay Less Tax in Australia

Every financial year, small business owners across Victoria hand over more tax than they legally need to — not because they're doing anything wrong, but because they're missing opportunities the ATO actually allows. Legal tax minimisation isn't a loophole. It's built into the tax system by design. Here's how to use it properly.

Tax Planning vs Tax Evasion

Before anything else, understand the line. Tax planning means legitimately arranging your affairs — claiming deductions you're entitled to, contributing to super, choosing an appropriate structure — to reduce the tax you owe. Tax evasion means hiding income, inflating deductions or falsifying records, which is a criminal offence.

Sitting in between is aggressive tax avoidance, which the ATO can unwind under Part IVA of the Income Tax Assessment Act 1936 if a scheme's dominant purpose is obtaining a tax benefit with no real commercial substance. The strategies below all sit firmly on the legal side of that line — they're standard practice, used by accountants and BAS agents nationwide.

Maximise Legitimate Deductions

Under section 8-1 of the Income Tax Assessment Act 1997, you can deduct any expense incurred in earning assessable income, provided it isn't capital, private or domestic in nature. Business owners routinely under-claim because they don't track expenses properly throughout the year. Commonly missed deductions include:

• Home office running costs — electricity, internet, phone, using the ATO's fixed-rate or actual cost method
• Motor vehicle expenses — logbook or cents-per-kilometre method for business use
• Tools, equipment and software subscriptions, including Xero itself
• Professional development, insurance and bank fees tied to the business
• Bad debts written off before year-end
• Prepaid expenses such as insurance or subscriptions paid before 30 June for the following year

The catch is substantiation — the ATO expects receipts, logbooks and a clear connection to income-earning activity. This is where a lot of Mornington Peninsula tradies and consultants leave money on the table simply from disorganised records.

Use Superannuation Contributions

Making concessional (pre-tax) super contributions is one of the most effective, fully legal ways to cut your taxable income. Contributions are taxed at 15% inside the fund instead of your marginal rate, which can be up to 45% plus the 2% Medicare levy.

• The concessional cap sits at $30,000 per year for 2025–26 (indexed annually)
• If your total super balance is under $500,000, unused cap amounts from the past five years can be carried forward
• Business owners can make personal deductible contributions directly, not just through employer contributions
• Watch Division 293 tax — an extra 15% applies to concessional contributions if your income plus contributions exceeds $250,000

If you employ staff, your compulsory Superannuation Guarantee obligations under the Superannuation Guarantee (Administration) Act 1992 are themselves a deductible business expense — another reason to keep contributions paid on time and correctly reported through Xero payroll.

Instant Asset Write-Off & Small Business Concessions

Small businesses with an aggregated turnover under $10 million can access the instant asset write-off, allowing an immediate deduction for eligible depreciating assets rather than spreading the cost over several years. The threshold changes each Budget, so confirm the current figure before purchasing — but at the time of writing it has been set at $20,000 per asset.

Other small business concessions worth checking with your adviser include:

• Simplified depreciation pooling for assets above the write-off threshold
• Small Business Income Tax Offset of up to $1,000 for unincorporated businesses
• CGT small business concessions (Division 152, ITAA 1997) if you sell active business assets, including the 15-year exemption and retirement exemption

Timing an asset purchase before 30 June, rather than in July, can genuinely shift when you get the deduction — but only buy what the business actually needs. Spending money purely to save tax rarely makes financial sense.

Choose the Right Business Structure

Structure has a bigger tax impact than most people realise. A sole trader pays individual marginal rates, which climb to 45% above $190,000 (2024–25 brackets) plus the Medicare levy. A company taxed as a base rate entity pays a flat 25%. A discretionary trust can distribute income across family members or a corporate beneficiary, potentially reducing the overall tax paid by the group.

• Sole trader — simple, but no separation between personal and business tax
• Company — flat 25% rate, retained profits taxed at that rate, dividends carry franking credits
• Discretionary trust — flexible income distribution, useful for family businesses
• Partnership — income flows to partners' individual returns

Restructuring has legal and CGT implications, so this isn't a DIY decision — get advice from your accountant before changing structure, and make sure your bookkeeper updates your Xero file and payroll setup to match.

Time Your Income and Expenses

Because Australia runs a self-assessment tax system on a 30 June year-end, timing matters. Legitimate strategies include:

• Deferring invoicing for work completed near year-end, where trading terms genuinely allow it
• Bringing forward deductible expenses — stock, repairs, subscriptions — into the current financial year
• Prepaying up to 12 months of certain expenses under the prepayment rules for small businesses
• Writing off obsolete stock or bad debts before 30 June rather than the following year

None of this changes how much tax you'll eventually pay over the life of the business — it changes when you pay it, which matters for cash flow, especially with BAS and PAYG instalments landing throughout the year.

Keep Clean Records with Xero

None of the above works without records that stand up to an ATO review. The ATO requires you to keep records for five years, and under TASA 2009, a registered BAS agent lodging on your behalf needs accurate source data to do it properly.

Running your books through Xero with bank feeds, receipt capture and reconciled accounts means every deduction is traceable, every super contribution is logged, and your BAS and tax return figures match what actually happened in the business — not a guess reconstructed in June.

The bottom line: legally paying less tax comes down to three things — claiming everything you're entitled to, structuring and timing sensibly, and keeping records clean enough to prove it. Talk to your registered tax agent about your specific position, and make sure your bookkeeping is up to date well before 30 June so there's still time to act on what you find.