Running a business in Perth means keeping up with more than just customers, invoices, and payroll. One of the most important responsibilities for Australian businesses is lodging and paying your Business Activity Statement (BAS) on time.

Missing BAS deadlines can lead to penalties, interest charges, and unnecessary stress. Whether you’re a sole trader, tradie, café owner, consultant, or growing company, understanding BAS due dates for 2026 can help you stay compliant and avoid costly mistakes.

At JGW Bookkeeping Services, we help Perth businesses stay organised, meet ATO deadlines, and maintain healthy cash flow throughout the financial year.

What Is a BAS?

A Business Activity Statement (BAS) is a form submitted to the Australian Taxation Office (ATO) to report and pay taxes such as:

• Goods and Services Tax (GST)
• Pay As You Go (PAYG) withholding
• PAYG instalments
• Fringe Benefits Tax (FBT) instalments
• Other business tax obligations

Most small businesses in Australia lodge BAS quarterly, while larger businesses may need to lodge monthly.

BAS Due Dates for 2026

Here are the key quarterly BAS due dates for the 2025–26 financial year that Perth businesses should know.

BAS Quarter	Reporting Period	Standard Due Date
Q2	October – December 2025	28 February 2026
Q3	January – March 2026	28 April 2026
Q4	April – June 2026	28 July 2026

For businesses lodging through a registered BAS or tax agent, extended deadlines may apply.

Also Check: BAS vs IAS Explained for Perth Small Businesses

BAS Agent Extended Due Dates for 2026

If you work with a registered bookkeeping or BAS agent, you may receive additional time for lodgement.

BAS Quarter	Agent Extended Due Date
Q2 2025–26	No standard extension available
Q3 2025–26	26 May 2026
Q4 2025–26	25 August 2026

These concessions generally apply when lodgements are submitted electronically through approved ATO systems.

Monthly BAS Due Dates in 2026

Businesses reporting GST monthly usually need to lodge by the 21st day of the following month.

For example:

• January 2026 BAS → Due 21 February 2026
• February 2026 BAS → Due 21 March 2026
• March 2026 BAS → Due 21 April 2026

The ATO requires many businesses with GST turnover above $20 million to report monthly.

What Happens If You Miss a BAS Deadline?

Missing your BAS due date can result in:

Late Lodgement Penalties

The ATO may issue Failure to Lodge (FTL) penalties depending on your business size and how overdue the BAS becomes.

General Interest Charges (GIC)

Interest may apply on unpaid amounts, increasing your total tax liability over time.

Cash Flow Pressure

Unexpected tax bills and penalties can place pressure on business finances and operational planning.

Increased ATO Attention

Repeated late lodgements may trigger closer monitoring from the ATO and potential compliance action.

Also Check: BAS Preparation in Perth: What Local Businesses Need to Know

Why Perth Businesses Often Fall Behind on BAS

Many small business owners struggle with BAS because they are focused on day-to-day operations. Common challenges include:

• Poor record keeping
• Mixing personal and business expenses
• Missing invoice reconciliation
• Incomplete payroll data
• Last-minute bookkeeping
• Seasonal cash flow fluctuations

This is especially common for tradies, hospitality businesses, contractors, and growing small businesses managing multiple responsibilities at once.

Tips to Stay Ahead of BAS Deadlines

1. Use Cloud Accounting Software

Platforms like Xero or MYOB can automate GST tracking, invoice management, and bank reconciliation.

2. Reconcile Accounts Weekly

Avoid leaving bookkeeping until the end of the quarter. Weekly reconciliation makes BAS preparation far easier and more accurate.

3. Set Aside GST Funds

A smart strategy is to transfer GST collected from customers into a separate savings account so funds are available when BAS is due.

4. Work With a BAS Agent

A registered BAS agent can help ensure:

• Accurate lodgements
• Reduced errors
• Better record keeping
• Extended due dates where applicable
• Ongoing compliance support

5. Create a Tax Calendar

Set reminders for:

• BAS due dates
• Payroll obligations
• Superannuation deadlines
• EOFY reporting
• PAYG instalments

How Professional Bookkeeping Helps Your Business

Reliable bookkeeping does more than help you lodge BAS on time. It gives you a clearer picture of your business finances and helps improve decision-making.

Professional bookkeeping support can assist with:

• GST tracking
• Payroll processing
• Bank reconciliations
• Accounts payable and receivable
• Financial reporting
• Cash flow management
• BAS preparation and lodgement

For Perth businesses, having an experienced local bookkeeper means fewer surprises and better financial control throughout the year.

Upcoming Financial Changes Businesses Should Watch in 2026

Australian businesses should also stay aware of other important compliance updates and financial obligations throughout 2026, including superannuation reporting and payroll changes. Discussions around future super payment reforms and tighter compliance requirements are already gaining attention among business owners and accountants.

Staying organised early can help businesses adapt smoothly to future ATO requirements.

Why Choose JGW Bookkeeping Services?

At JGW Bookkeeping Services, we support Perth businesses with dependable bookkeeping and BAS services tailored to small and medium businesses.

We help clients:

• Stay compliant with ATO requirements
• Lodge BAS accurately and on time
• Improve bookkeeping systems
• Reduce financial stress
• Gain clearer financial insights

Whether you’re a sole trader or an established business, professional bookkeeping can save time, reduce errors, and help you focus on growth.

Final Thoughts

Knowing when BAS is due in 2026 is essential for every Perth business owner. Staying ahead of ATO deadlines helps avoid penalties, improves cash flow management, and keeps your business financially organised.

By maintaining accurate records, planning ahead, and working with experienced bookkeeping professionals, BAS season becomes far less stressful.

If you need help with BAS preparation, bookkeeping, or ongoing financial support, JGW Bookkeeping Services can help your business stay compliant and confident year-round.

FAQs

What is the BAS due date for March 2026 quarter?

The BAS for the January to March 2026 quarter is due on 28 April 2026.

Do BAS agents get extra time to lodge?

Yes, registered BAS or tax agents may receive extended lodgement deadlines for eligible electronic lodgements.

What happens if I cannot pay my BAS on time?

You should contact the Australian Taxation Office before the due date to discuss payment arrangements and avoid additional penalties.

Can small businesses lodge BAS annually?

Some voluntarily registered businesses with lower turnover may be eligible to lodge GST annually instead of quarterly.