Understanding BAS Returns: A Comprehensive Guide for Australian Businesses

Feb 14, 2026By Anas Khawam
Anas Khawam

What is a BAS Return?

For Australian businesses, understanding the Business Activity Statement (BAS) is crucial for compliance with tax obligations. The BAS is a form submitted to the Australian Taxation Office (ATO) by all businesses registered for Goods and Services Tax (GST). It reports and pays several tax obligations, including GST, Pay As You Go (PAYG) installments, and other taxes.

The BAS helps streamline the process of tax reporting by consolidating multiple tax obligations into one form. This not only simplifies the task for businesses but also ensures that they remain compliant with Australian tax laws.

business tax documents

Components of a BAS

Understanding the components of a BAS is essential for accurate and timely submissions. Here are the main elements:

  • GST: This is the most common component. Businesses report the GST collected on sales and the GST paid on purchases.
  • PAYG Withholding: If your business withholds tax from employee wages, this needs to be reported.
  • PAYG Instalments: This is a system for making regular payments towards your expected end-of-year income tax liability.

Each of these components has specific sections within the BAS form that need to be completed accurately to avoid penalties.

How to Prepare Your BAS

Preparing your BAS involves several steps to ensure everything is in order. Here’s a simplified process:

  1. Gather all necessary financial records, such as sales and purchase invoices.
  2. Calculate the total GST collected and paid.
  3. Determine PAYG withholding amounts for employees.
  4. Complete the BAS form accurately using accounting software or manually.

It’s important to review all entries for accuracy before submission to avoid any discrepancies with the ATO.

accounting software

Submitting Your BAS

Once your BAS is prepared, it can be submitted electronically through the ATO's online services or via paper form. Most businesses prefer the electronic method due to its convenience and efficiency.

The ATO offers several options for electronic submission, including through the Business Portal, Standard Business Reporting (SBR) enabled software, or by using the services of a registered tax or BAS agent.

Understanding BAS Due Dates

Timely submission of your BAS is crucial to avoid late fees and penalties. BAS due dates depend on your reporting cycle, which can be monthly, quarterly, or annually. The most common reporting cycle is quarterly.

The ATO provides a schedule of due dates, and businesses must ensure that their BAS is submitted by the specified deadline. Setting reminders and using calendar alerts can help keep track of these important dates.

calendar reminder

Common Mistakes and How to Avoid Them

Errors in BAS submissions can lead to penalties and unwanted audits. Common mistakes include incorrect GST calculations, missing information, and late submissions. To avoid these, consider the following tips:

  • Use accounting software to automate calculations and reduce human error.
  • Regularly reconcile your accounts to ensure all data is accurate.
  • Consider employing a professional accountant or BAS agent to review submissions.

By taking these precautions, businesses can minimize the risk of errors and ensure compliance.

Conclusion

Understanding and managing BAS returns is a vital responsibility for Australian businesses. By familiarizing yourself with the components, preparation process, and submission methods, you can ensure your business remains compliant with the ATO’s requirements.

While it may seem complex, utilizing professional assistance and modern accounting tools can significantly ease the process, allowing you to focus more on growing your business.