Common Mistakes to Avoid When Filing Your BAS Return

Apr 18, 2026By Anas Khawam
Anas Khawam

Understanding the BAS Return

Filing your Business Activity Statement (BAS) return is a crucial task for any business registered for GST in Australia. It's essential to ensure accuracy to avoid potential fines or audits. In this post, we'll explore the common mistakes businesses make and how to avoid them.

The BAS return includes various tax obligations such as GST, PAYG withholding, and other taxes. Understanding each component is vital to ensure that you file correctly. Many businesses find it challenging to manage these components, leading to errors.

business paperwork

Incorrect GST Reporting

One of the most frequent errors is incorrect GST reporting. This mistake often occurs due to misunderstanding what should be included in your GST calculations. Make sure to include all taxable sales and purchases, and verify that GST credits are claimed correctly.

Utilize accounting software to automate GST calculations. This can significantly reduce errors caused by manual data entry. Regularly updating your software ensures that it aligns with the latest tax laws and regulations.

Overlooking PAYG Withholding

Another area where businesses commonly make mistakes is PAYG withholding. It's crucial to withhold the correct amount from employee wages and report this in your BAS. Errors in PAYG withholding can lead to substantial penalties.

tax forms

Regularly review payroll systems and ensure that they are set up to calculate PAYG withholding accurately. Training staff responsible for payroll on the latest regulations can also help prevent errors.

Not Reconciling Accounts

Failing to reconcile your accounts before filing your BAS is a significant mistake. Reconciliation helps ensure that all transactions have been recorded correctly and that your reported figures are accurate.

Make it a habit to reconcile your accounts monthly. This practice aids in identifying discrepancies early, allowing for corrections before your BAS is due. It also ensures that your financial records are up-to-date.

accounting software

Neglecting to Lodge on Time

Timely lodgement of your BAS is critical. Missing the deadline can result in fines and interest charges. Many businesses underestimate the time required to prepare their BAS, leading to last-minute rush and errors.

Set reminders well in advance of the due date and consider lodging early to avoid penalties. If you find yourself struggling with time management, seeking professional help from an accountant might be beneficial.

Ignoring Professional Assistance

Attempting to file your BAS without professional help can lead to costly mistakes, especially for those unfamiliar with tax regulations. Accountants and tax professionals bring expertise that can save you time and money.

Consider consulting with a tax professional, particularly if your business has complex transactions. Their insights can help optimize your tax strategy and ensure compliance with the law.

By avoiding these common mistakes, you can file your BAS return confidently and accurately. Implementing effective strategies and seeking professional advice when needed will help streamline the process and prevent costly errors.