Australia Taxation – Advanced common mistakes
Australia Taxation – Advanced · Understand the traps and how to avoid them.
When calculating a company's taxable income, applying the corporate tax rate directly to accounting profit without first reconciling non-deductible items (fines, entertainment, exempt income) and non-assessable amounts, then also failing to add back accounting depreciation and substitute the tax depreciation deduction.
Candidates carry over financial-accounting habits where profit is the answer rather than a starting point, and they forget that s 8-1 deductibility and Div 40/43 capital allowances override accounting treatment. Under exam time pressure the reconciliation table is skipped entirely.
What to do instead
Always build a formal reconciliation from accounting profit: assessable income additions, then deductions, then separate statutory adjustments (Div 40/43, s 290 super, non-deductibles). Practise 5-minute reconciliation drills so the add-back/deduct-back sequence becomes automatic before attempting full calculations.
Treating a discretionary beneficiary's entitlement to trust income as fixed and taxing it at the beneficiary's marginal rates without checking whether the trustee was made presently entitled, and ignoring the trustee's s 99A liability where no beneficiary is presently entitled.
Candidates conflate 'named in the deed' with 'presently entitled', and underestimate how streaming, default beneficiaries and resolutions determine who is assessed. The present-entitlement concept is abstract and rarely practised in worked examples.
What to do instead
Before any trust calculation, state in one sentence who is presently entitled, to what amount, and under which provision (Div 6 ITAA 1936). Map each beneficiary to their assessment and separately test the s 99A/99 default position for undistributed income. Redo past questions writing this sentence first.
Applying the corporate tax rate or company franking logic to a partnership's net income, instead of allocating each partner's share of net income (or loss) and then applying each partner's own marginal rates and loss rules.
Partnerships are transparent but the calculation of 'net income of the partnership' under s 90 is a separate concept from taxable income, and candidates miss that partners can have different residency and loss positions. The two-step structure is easy to collapse under pressure.
What to do instead
Use a two-column worksheet: (1) partnership net income under s 90, (2) each partner's share adjusted for their own deductions, losses and residency. Explicitly note that a partnership loss is not a deduction to the partnership but is allocated to partners subject to their individual tests.
Assuming a foreign source of income is exempt or fully assessable without first determining the taxpayer's residency under the ordinary concepts and statutory tests, and without applying the correct double tax agreement or foreign income tax offset cap.
Residency is treated as a given rather than a threshold question, and candidates skip the FITO limitation (offset capped at Australian tax on the foreign income) and the DTA tie-breaker articles. The interaction of residency, source and treaty relief is genuinely complex.
What to do instead
Start every international question with an explicit residency conclusion citing the relevant test, then the source of income, then treaty relief, then the FITO cap. Write the cap formula (Australian tax on double-taxed income) before computing the offset so the limit is never missed.
Applying the Div 293 extra tax on super contributions only to concessional contributions without including the employer's SG contributions and salary sacrifice, and failing to check the cap against the individual's income for surcharge purposes including reportable fringe benefits.
Candidates remember the threshold figure but not the definition of 'income for surcharge purposes', which sweeps in reportable super and net investment losses. The distinction between the contributions cap and the surcharge income test is blurred.
What to do instead
For every super question, list all concessional contributions (SG, salary sacrifice, personal deductible) and separately compute income for surcharge purposes. Keep a one-page reference of the current thresholds and cap figures and verify against the question's year before calculating.
Applying the CGT discount, small business concessions or rollover without first checking that a CGT event occurred, identifying the correct event (A1, C2, D1 etc.), and establishing the cost base elements including incidental costs and non-deductible third-element costs.
Candidates jump to the discount or concession because those are the memorable numbers, skipping the event identification and cost base build-up. Third element costs and the treatment of adjustments to cost base are frequently overlooked.
What to do instead
Use a fixed CGT template: event and date, CGT asset, cost base elements (five), capital proceeds, gain/loss, then exemptions, then discount, then concessions in that order. Never compute a discount before the event and cost base lines are filled.
Treating GST as a single rate applied to turnover without distinguishing taxable, GST-free and input-taxed supplies, and without separating the entity's entitlement to input tax credits on acquisitions used for input-taxed or private purposes.
Candidates apply a flat 10% to total sales and forget that GST-free supplies (health, education, basic food) and input-taxed supplies (financial services, residential rent) produce no GST or restricted credits. The apportionment of credits is rarely practised.
What to do instead
Classify every supply in the fact pattern as taxable, GST-free or input-taxed before any arithmetic, then compute net GST as GST collected minus creditable acquisitions, applying an apportionment for mixed use. Build a three-column classification table as a first step.
When a question involves a reviewable decision, citing the wrong review body or deadline - for example sending an objection to the AAT/ART rather than the ATO, or missing the two-year objection period for a private ruling - without first identifying whether the decision is an assessment, a reviewable objection decision or a complaint.
The administrative pathway (objection to the Commissioner, then review by the tribunal or court) is learned as a list rather than a sequence, and candidates confuse time limits for different decision types. Statutory deadlines are easy to misremember.
What to do instead
Draw the pathway as a flow: decision → objection to ATO within the statutory period → review by the ART or appeal to the Federal Court. Attach the specific time limit to each arrow and check the decision type before choosing the forum.
Recommending a structure or arrangement that achieves a tax outcome without testing it against the general anti-avoidance provisions or the specific integrity rules, and without considering the ethical and professional obligations of advising on aggressive positions.
Candidates focus on the technical result and treat anti-avoidance as a separate topic, failing to see that a scheme's dominant purpose and the Commissioner's reconstruction power can unwind the entire plan. Ethics is treated as a soft add-on rather than a constraint on advice.
What to do instead
For every planning answer, add a mandatory 'integrity check' paragraph: identify the dominant purpose, apply the anti-avoidance tests, note any specific integrity provision, and state the professional standards obligation. Structure answers as outcome → risk → recommendation, never outcome alone.
Calculating an individual's taxable income without applying the correct marginal rate scale, the Medicare levy and the Medicare levy surcharge based on the right income test, and without offsetting non-refundable tax offsets against tax payable in the correct order.
The levy surcharge income base differs from taxable income, and the ordering of offsets (non-refundable before refundable, with some offsets limited to tax payable) is a procedural detail that is easily reversed. Candidates memorise rates but not the sequence.
What to do instead
Build a standard individual computation pro forma: taxable income, tax on taxable income, Medicare levy, surcharge, then offsets in order. Practise one full worked example per income band until the sequence and the surcharge income base are automatic.