What happens if I overclaim tax deductions?
If a deduction is overclaimed, the ATO may amend the return, reduce the claim, charge extra tax and interest, and penalties can apply in more serious cases.
Last updated: 7 July 2026. General information for Australian tradies. Not personal tax advice.
If it was a mistake
If you notice a mistake, you can amend the return. Acting early and keeping a clear explanation is better than waiting for a review.
Interest and penalties
If tax was underpaid, shortfall interest can apply. Penalties depend on behaviour, such as whether reasonable care was taken.
How to avoid overclaiming
Do not guess large claims, do not claim reimbursed expenses, and do not claim private costs as work costs.
Where to check it in TradieCalc
Use category fields and notes from the PDF report to check whether a claim is duplicated or unsupported.
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