Preparing your Business Activity Statement (BAS) doesn't have to be stressful. With the right systems and a structured approach, you can keep filings accurate, submit on time, and maintain audit-ready documentation throughout the quarter.
Why BAS Preparation Matters
The BAS is one of the most critical compliance obligations for Australian businesses. Getting it wrong can result in penalties, cash flow issues, and unwanted attention from the ATO. But with proper preparation, it becomes a routine process rather than a quarterly headache.
Monthly Reconciliation Tasks
Don't wait until the end of the quarter. These monthly tasks will make BAS time much smoother:
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Bank Reconciliation Reconcile all bank accounts within 5 business days of month-end.
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GST Coding Review Check that all transactions are coded with the correct GST treatment.
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Supplier Invoice Matching Ensure all supplier invoices are matched to payments and properly recorded.
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Customer Payment Allocation Allocate all customer payments to the correct invoices.
Pre-Lodgement Checklist
Before you lodge your BAS, run through this checklist to ensure everything is in order:
- All bank accounts are reconciled to the last day of the quarter
- GST on sales matches your sales reports
- GST on purchases is supported by valid tax invoices
- PAYG withholding matches your payroll reports
- Any adjustments from prior periods are documented
- The BAS figures tie back to your accounting software reports
Common GST Mistakes to Avoid
These are the errors we see most frequently when reviewing client BAS submissions:
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Claiming GST without valid tax invoices You need a valid tax invoice for purchases over $82.50 (including GST).
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Incorrect GST treatment on mixed supplies Some supplies are GST-free or input-taxed. Know the difference.
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Not adjusting for private use If assets are used partly for private purposes, GST claims must be adjusted.
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Missing the lodgement deadline Late lodgement can result in penalties. Set calendar reminders.
Building Audit-Ready Documentation
The ATO can request documentation going back 5 years. Here's how to stay prepared:
- Keep copies of all tax invoices (digital storage is acceptable)
- Maintain a clear audit trail from source documents to BAS figures
- Document any unusual transactions or adjustments
- Store BAS lodgement confirmations from the ATO
- Keep records of any ATO correspondence
Pro tip: Use cloud accounting software like Xero or MYOB to automatically store source documents attached to transactions. This makes audit preparation significantly easier.
How Aussure BPO Can Help
Our team handles BAS preparation for dozens of Australian businesses every quarter. We can manage your monthly reconciliations, prepare your BAS for review, and ensure you're always audit-ready. This frees up your time to focus on growing your business while we handle the compliance.