Common BAS Return Mistakes and How to Avoid Them

Apr 15, 2026By Anas Khawam
Anas Khawam

Understanding BAS Returns

Business Activity Statements (BAS) are critical for businesses registered for GST in Australia. They help in reporting and paying various tax obligations. However, errors in BAS returns can lead to costly penalties and complications. Understanding common mistakes can help businesses avoid them and ensure compliance.

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Incorrect GST Calculations

One of the most frequent errors is incorrect GST calculations. This usually happens when businesses either miscalculate GST on sales or fail to claim the correct GST credits on purchases. To avoid this, ensure that your accounting software is up-to-date and you regularly reconcile your accounts. Double-check calculations to prevent discrepancies.

Missing or Misplaced Invoices

Another common mistake is the misplacement or loss of invoices, leading to incorrect reporting. It's crucial to maintain a well-organized record-keeping system. Digital record-keeping solutions can be particularly effective, as they allow easy access and storage of financial documents. Regularly audit your records to ensure everything is in order.

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Common Errors in Reporting

Businesses often make errors in reporting figures on their BAS. These can include reporting the wrong amounts or using incorrect tax codes. To mitigate these mistakes, thoroughly review the instructions in the BAS form and ensure that all figures align with your accounting records.

Omitting Income or Deductions

Failing to report all income or claim all eligible deductions can create inaccuracies in your BAS. Ensure that every source of income is reported, and review all potential deductions. Consulting with a tax professional can provide clarity and ensure that you're maximizing your deductions.

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Failing to Lodge on Time

Late lodgement of BAS can result in penalties and interest charges. To avoid this, mark all key dates in your calendar and set reminders well in advance. Many businesses find it helpful to lodge their BAS early to avoid last-minute rushes and potential delays.

Seeking Professional Help

If you're unsure about any aspect of your BAS, seeking the help of a tax professional or accountant can be invaluable. They can provide expert advice, help identify potential issues, and ensure that your BAS is lodged accurately and on time.

Regular Training and Updates

Tax laws and regulations frequently change. Regular training for your finance team can help them stay updated with the latest requirements. Investing in training and updates for your accounting software can also reduce the risk of errors and improve efficiency.

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