How to Lodge a Business Activity Statement in Australia for 2026

The first official envelope from the tax office lands on your desk, and suddenly, it’s real. For many new business owners, that first Business Activity Statement (BAS) is a rite of passage—a clear signal your venture is live, but also a signpost for new, formal responsibilities. Lodging your BAS correctly comes down to keeping meticulous financial records and reporting them through an approved Australian Taxation Office (ATO) channel, a standard rhythm of running a business in Australia.

By Panbo Ye, CFP® | FCPA | SSA® | Founder, Everglow

Who this article is for: Business owners, sole traders, and managers who need to understand their options and obligations for lodging a BAS in Australia.

Preparing Your Records: The Foundation of a Smooth Lodgement

A stress-free BAS lodgement doesn’t begin on the due date—it’s the result of solid bookkeeping habits built into your daily business rhythm. When your financial records are clean and consistent, lodging your BAS becomes a simple review, not a frantic scramble. The core task is to track every dollar in and every dollar out, paying close attention to the Goods and Services Tax (GST) component so you can claim the credits you are entitled to.

Your record-keeping system, whether digital or physical, must reliably capture several key documents:

• Sales Records: All tax invoices issued to customers, detailing the services or goods sold and the GST collected on behalf of the government.
• Expense Records: All tax invoices and receipts for business purchases, ensuring they clearly state the GST you paid.
• Bank and Credit Card Statements: These are essential for reconciling your recorded income and expenses against actual cash movements.
• Payroll Summaries: If you employ staff, you need precise figures for gross wages paid and the Pay As You Go (PAYG) tax withheld.

Clean, organised financial records are the foundation of stress-free tax compliance, creating the clear data trail needed to lodge your BAS with confidence.

What Are Your BAS Lodgement Options?

With your records organised, you face a key decision: how will you lodge your BAS? This choice should align with your business's complexity, your comfort with technology, and the level of professional oversight you prefer. The Australian Taxation Office (ATO) provides a few well-defined pathways for businesses to meet their obligations.

Each method has distinct advantages depending on your specific circumstances:

• The DIY Approach: You can lodge your own BAS through the ATO's secure portals. For companies and trusts, this is Online services for business. Sole traders use their myGov account linked to the ATO. This path offers complete control and may be suitable for straightforward business affairs.
• Using SBR-Enabled Software: Modern accounting platforms like Xero or MYOB have Standard Business Reporting (SBR) functionality. This allows you to prepare and lodge your BAS directly from your bookkeeping software, creating a streamlined workflow.
• Working with a Registered Agent: A registered tax or BAS agent can manage the entire process for you. This path offers professional oversight, strategic advice, and peace of mind. Agents may also access extended lodgement deadlines, providing valuable flexibility.

The following table provides a high-level comparison to help you determine the best fit for your business.

Choosing your lodgement method is a foundational decision in your compliance process.

Lodgement Method	Best For	Key Advantage	Potential Consideration
ATO Online Services	Hands-on sole traders and small business owners with simple affairs.	Direct control and no additional software or agent costs.	Requires confidence in your own figures and manual data entry.
Accounting Software (SBR)	Businesses using integrated bookkeeping software.	Efficiency, as BAS figures are pre-filled from your accounts.	Involves software subscription costs and a potential learning curve.
Registered Agent	Business owners who value professional expertise and time savings.	Peace of mind, strategic advice, and often later due dates.	Incurs professional fees for the service.

Choosing the right lodgement method is a strategic decision that should align with your business's complexity, your internal resources, and your desire for professional oversight.

Worked Example: Dr Anya Sharma's Quarterly BAS

Abstract labels on a tax form become much clearer when connected to real business activity. Let’s follow Dr Anya Sharma, a GP operating as a sole trader in Sydney, as she prepares her quarterly BAS. She is registered for GST and must report her business activity to the ATO.

Here is a summary of Dr Sharma's practice activity for the September quarter:

• Total Patient Billings (GST-free): $50,000
• Minor Procedure Billings (with GST): $11,000 (which includes $1,000 of GST)
• Business Expenses (with GST): $22,000 (which includes $2,000 of GST for items like clinic rent and medical supplies)
• PAYG Instalment (as advised by the ATO): $5,000

Now, we translate Dr Sharma's figures into the key labels on her BAS form:

• G1 Total sales: This is her total gross income. She adds her GST-free billings ($50,000) and her GST-inclusive billings ($11,000) for a total of $61,000 at G1.
• 1A GST on sales: This is the GST she collected on the government's behalf, which is $1,000 from her minor procedures.
• 1B GST on purchases: This is the GST she paid on business costs. She can claim back the $2,000 of GST included in her rent and supply expenses.

To determine her GST outcome for the quarter, she subtracts the GST she paid (1B) from the GST she collected (1A). The calculation is $1,000 – $2,000 = -$1,000. The negative result means she is due a $1,000 GST refund from the ATO for this period. After accounting for her $5,000 PAYG Instalment, her final BAS position is a net payment due to the ATO of $4,000.

The core BAS calculation is GST Collected (1A) minus GST Paid (1B), which determines your GST payment or refund before other obligations are included.

Frequently Asked Questions About Lodging a BAS

Getting clear, practical answers to common questions is key to staying compliant and managing your cash flow effectively. Here are some of the most frequent queries we receive from business owners about their BAS obligations.

Can I get an extension on my BAS due date?

Yes, but you should be proactive. If you anticipate difficulty meeting a deadline due to unforeseen circumstances, you may apply for a lodgement deferral directly with the Australian Taxation Office (ATO). Alternatively, working with a registered tax or BAS agent often provides access to later lodgement due dates under their special lodgement program, which can offer a valuable buffer.

What if I find a mistake on a lodged BAS?

This is a common scenario and is usually straightforward to correct. For most minor errors, the ATO allows you to adjust for the mistake on your next BAS. However, if the error is significant or outside certain time and value limits, you may need to revise the original BAS. The correct method depends on the nature of the error, so it may be wise to seek advice.

What is the difference between GST-free and input-taxed?

This is a critical distinction that affects your ability to claim GST credits. GST-free sales (e.g., basic foods, some health services) have no GST in the price, but you can still claim GST credits on purchases used to make them. Input-taxed sales (e.g., residential rent, financial services) also have no GST in the price, but you cannot claim GST credits on related business purchases.

Do I still need to lodge a BAS with no business activity?

Yes. If you are registered for GST, you have a legal obligation to lodge a BAS for every reporting period, even if you had zero sales and zero expenses. In this situation, you simply lodge a ‘nil’ BAS by entering zeros for all the key amounts. This fulfils your reporting duty for that period and prevents the ATO from flagging your account for non-lodgement and issuing penalties.

Lodging your Business Activity Statement is a fundamental part of the Australian business landscape. By maintaining organised records, understanding your reporting obligations, and choosing the right lodgement method for your circumstances, you can manage this process with confidence. It transforms a compliance task into a regular, valuable checkpoint for your business’s financial health.

If you would like clarity on how these principles may apply to your own circumstances, contact Everglow on 1300 913 929 or email contact@everglow.au.

To book directly: Book a meeting with Panbo.