BAS lodgement checklist: a practical, step‑by‑step framework you can reuse every period

If you handle your own Business Activity Statement (BAS), a clear, reusable process is your best safeguard against last‑minute stress and avoidable errors. This BAS lodgement checklist focuses on practical preparation, reconciliations, reviews, and sign‑off steps you can follow each period—no matter which accounting platform you use.

What to prepare before you start

Strong BAS preparation starts with complete, orderly records. Aim to assemble these items in one place so you can move through the return efficiently:

• Accounting file access and user permissions for the current BAS period.
• Sales records for the period (invoices, receipts, credit notes).
• Purchase records for the period (bills, receipts, supplier credits).
• Bank and credit card statements covering the entire BAS period.
• Evidence for adjustments (write‑offs, accruals, corrections) to support any changes.
• Payroll reports that align to your accounting system, including Single Touch Payroll (STP) data if you employ staff.
• Internal notes about unusual transactions, one‑off events, or prior‑period corrections you intend to make.

Having these items up front reduces back‑and‑forth later and makes your review steps faster and more reliable.

Step‑by‑step BAS lodgement checklist

Use the following framework from start to finish each period. Repeat the same sequence next time to build speed and confidence.

1. Lock your BAS period dates.

   Confirm the exact start and end dates you are lodging for. Keep a note of any prior‑period adjustments you will include this time.

2. Complete data entry.

   Enter or import all sales and purchase transactions for the period. Ensure every document is dated correctly and coded to the right account and tax setting.

3. Reconcile bank and card accounts.

   Match every transaction in your accounting file to your statements. Investigate unmatched items, duplicates, and suspense entries before you proceed.

4. Review sales (income) coding.
   • Confirm that standard sales use the correct tax treatment.
   • Check credit notes and refunds are applied to the right period and tax code.
   • Scan for unusual or large entries that may need supporting documentation.
5. Review purchases (expenses) coding.
   • Verify that supplier bills and receipts use the appropriate tax setting.
   • Confirm any corporate card or petty cash spend is recorded and coded.
   • Attach evidence for significant or exceptional expenses.
6. Check payroll and STP status (if you have employees).
   • Run payroll reports for the BAS period and compare with your general ledger.
   • Ensure Single Touch Payroll (STP) submissions reflect what is in your payroll and accounts.
   • Note any corrections you intend to process before lodging.
7. Validate obligations associated with GST compliance.
   • Confirm that the totals derived from your accounting file align with your transaction detail.
   • If you made prior‑period corrections, ensure they are clearly documented.
8. Validate obligations associated with PAYG withholding (where applicable).
   • Check that the withholding reflected in your payroll reports ties to your ledger.
   • Confirm you can trace totals back to detailed employee records.
9. Run control reports and analytics.
   • Trial balance for the period end date.
   • GST/PAYG summary reports from your accounting system.
   • Exception reports highlighting uncoded or tax‑exempt transactions that should be reviewed.
10. Perform sense‑checks.
    • Compare this period’s figures to the previous comparable period.
    • Look for spikes or drops in key categories and confirm legitimate reasons (seasonality, one‑offs, timing).
    • Confirm large journals or adjustments have clear explanations and attachments.
11. Prepare your BAS working paper.

    Capture the period dates, report totals, reconciliation notes, and references to supporting documents. This becomes your audit trail and makes future reviews faster.

12. Internal review and approval.
    • Have another team member review coding, reconciliations, and totals.
    • Document approvals with a timestamp and the reviewer’s name.
13. Finalise and lodge.

    Once you have confirmed completeness, accuracy, and approvals, proceed with lodgement through your normal channel. Retain confirmation of submission and store it with your working paper.

14. Post‑lodgement tasks.
    • Record the lodgement reference and date.
    • Set reminders for payment or any follow‑up actions based on your obligations.
    • Close and lock the period in your accounting file to prevent accidental changes.

Controls and reconciliations that make BAS smoother

Consistent controls make BAS cycles easier and help reduce the risk of errors. Build the following into your month‑ or quarter‑end routine:

• Bank reconciliation discipline: Reconcile frequently during the period to avoid a large workload at the end.
• Documented tax coding rules: Maintain a short, internal guide showing which accounts use which tax settings. Update it when your business changes.
• Exception reviews: Run and clear uncoded transactions, negative lines, and unusual tax‑free entries before you begin your BAS working paper.
• Supporting evidence library: Store invoices, receipts, and adjustment memos in one structured location linked to transactions.
• Two‑person review: Where possible, separate preparation and review to catch issues early.
• Consistent cutoff: Ensure late bills or sales are dated to the correct period and not mixed between cycles.

Common pitfalls to avoid

Small mistakes can compound by the time you reach your BAS. Keep an eye out for these issues:

• Incomplete records: Missing bills or sales reduce the accuracy of your totals and trigger rework later.
• Incorrect tax coding: Misapplied settings on sales or purchases can skew your reported figures.
• Unreconciled accounts: Differences between your bank statements and accounting file indicate data gaps that can affect totals.
• Forgetting payroll impacts: If you employ staff, ensure payroll and STP data align with your ledger before calculating totals associated with your obligations.
• Unclear adjustments: Adjustments without documentation invite confusion in future periods and complicate reviews.

Templates and systems that help

Consistent tools make your BAS process repeatable. Consider the following building blocks and adapt them to your setup:

• BAS working paper template: A one‑pager capturing period dates, report references, reconciliation notes, and approval sign‑off.
• Recurring month‑end checklist: A short task list for reconciliations, coding reviews, exception clearing, and document filing.
• Attachment policy: Define what evidence must be attached to transactions (e.g., invoices over a certain threshold).
• Version control: Keep a dated copy of each working paper and lodgement confirmation, so comparisons and audits are straightforward.
• Cloud accounting setups: If you use platforms such as Xero, MYOB, or QuickBooks, align your reports and coding rules with the platform’s features to streamline data checks and approvals.

Well‑designed templates reduce cognitive load. Over time, this saves hours each cycle and helps your team maintain quality during busy periods.

BAS lodgement checklist FAQs

How often should I complete the BAS lodgement checklist?

Complete your checklist every time you prepare a BAS for a new period. Keeping the same sequence—data entry, reconciliations, reviews, working paper, approval, and lodgement—helps you spot issues early and maintain consistent evidence across periods.

What if my payroll and Single Touch Payroll (STP) reports don’t match my ledger?

Pause and reconcile before lodging. Investigate timing differences, unposted journals, or duplicated entries. Aligning payroll, STP, and your accounts prior to submission helps ensure the figures associated with your obligations are complete and supportable.

How do I handle prior‑period corrections in my BAS?

Document the reason for the correction, the transactions affected, and how you calculated the adjustment. Keep that documentation with your current period working paper. Where your situation involves complex or uncertain treatment, seek advice from a qualified professional.

Can I rely on my accounting software reports alone?

Reports are essential, but they reflect the data and coding choices made during the period. Always pair reports with reconciliations, exception reviews, supporting evidence, and a second‑person check where possible.

What if I’m running behind on preparation?

Important note on limitations

This article provides general information only and is not financial or tax advice. Circumstances vary, and obligations can change. For guidance tailored to your situation, consult a qualified professional.