How Do You Reconcile GST Before a BAS in Parramatta?
To reconcile GST before a BAS, compare the GST totals in your accounting system with the underlying sales, purchases, payments, and adjustment records for the correct reporting period. Investigate every unexplained difference before relying on those figures for BAS preparation. Reconciliation is a quality-control review of your records; it is not the same as lodging a BAS. The Australian Taxation Office BAS information explains the broader preparation, lodgement, and payment context.
1. Confirm the BAS reporting period and scope
Record the relevant BAS period and the date range used in your accounting system. Identify which sales, purchases, payments, credit notes, and adjustments belong in that period.
This prevents confusion caused by comparing one period’s BAS report with bank transactions, invoices, or adjustments from another. Keep current-period activity separate from earlier or later transactions, and note items that may relate to a prior period.
Stop point: If you cannot establish which period a transaction belongs to, pause before changing its coding or including it in the figures.
2. Gather the records behind the GST totals
Collect the evidence needed to test the accounting-system totals. Depending on how the business keeps its records, this may include:
- GST and transaction reports from the accounting system
- Sales invoices and credit notes
- Supplier bills, receipts, and other purchase records
- Bank and payment-platform records
- Documents supporting manual journals or other adjustments
- Prior reconciliation notes and unresolved items
The aim is to connect summary GST figures to the records supporting them, rather than relying on an unchecked report. Businesses considering external BAS preparation, bookkeeping, and accounting services should also be able to provide this evidence to the reviewing adviser.
Stop point: If key invoices, receipts, bank records, or adjustment documents are missing, do not treat a balanced report as proof that the figures are correct.
3. Review GST-coded sales and purchases
Review the transaction listings that feed into the GST totals. Look for:
- Missing sales or purchases
- Duplicate invoices, bills, receipts, or payments
- Unusual or inconsistent GST codes
- Uncategorised or manually entered transactions
- Credit notes or reversals that may not have been reflected correctly
- Transactions whose GST treatment is unclear from the available evidence
Compare the transaction listing with source records, not just the bank balance. A difference is a prompt for investigation, not automatic proof of a bookkeeping mistake. It may reflect timing, reporting configuration, an adjustment, or uncertainty about treatment.
Stop point: If you are unsure how a transaction should be treated, record the question and supporting documents rather than choosing a code simply to make the totals balance.
4. Compare GST collected with GST credits
Compare GST associated with sales against GST credits associated with eligible business purchases. Then compare those reviewed amounts with the accounting-system totals intended for BAS preparation.
| Area | Evidence to inspect | What to compare | Possible follow-up |
|---|---|---|---|
| GST associated with sales | Sales invoices, credit notes, and sales report | Source records against the GST total | Check missing, duplicated, reversed, or incorrectly coded sales |
| GST credits associated with purchases | Bills, receipts, payment records, and purchase report | Source records against the purchase-related GST total | Investigate missing documents, duplicates, unusual codes, or uncertain treatment |
| Adjustments and corrections | Journal support, credit notes, reconciliation notes, and prior-period records | Adjustment against its reason and evidence | Confirm the affected period and obtain review where uncertain |
| Summary BAS figures | GST reports and reviewed transaction listings | Summary totals against reconciled records | Resolve or document each remaining variance |
Use the ATO’s BAS guidance alongside your records when confirming requirements relevant to your situation.
Stop point: If summary totals do not agree with reconciled records and you cannot explain the difference, do not proceed as though the figures are ready.
5. Classify and investigate each variance
Give each difference a provisional category so the investigation focuses on evidence rather than finding a number that makes the report balance.
- Missing transaction
- Check whether a sale, purchase, credit note, or payment appears in source records but not in the accounting system.
- Duplicate entry
- Compare invoice numbers, dates, amounts, suppliers, and payment records to identify repeated transactions.
- Coding issue
- Review the assigned GST code against the invoice, receipt, or other evidence. Do not change a code only because it produces the expected total.
- Timing difference
- Check whether the transaction, payment, invoice, or adjustment falls within the period being reconciled.
- Reporting or reconciliation difference
- Confirm that reports use the same period, accounts, filters, and adjustment entries.
- Uncertain transaction treatment
- Separate transactions where the evidence does not make GST treatment clear. These require informed review rather than assumption.
Stop point: If a variance fits more than one category, or evidence does not support a conclusion, document it and seek review.
6. Document supported adjustments before finalising figures
Make every correction traceable. Notes should identify:
- What changed
- Why it changed
- Which source record supports it
- Which reporting period it relates to
- Who prepared or reviewed the change
Retain source records with the reconciliation notes so another person can follow the reasoning. This matters especially for manual adjustments, reversals, and earlier-period corrections.
Stop point: Do not handle prior-period corrections or unsupported adjustments by guesswork. Escalate them for review.
7. Perform a final BAS evidence check
- Confirm the reporting period and report settings.
- Check that the source records are sufficiently complete.
- Confirm that GST-coded sales and purchases were reviewed.
- Resolve each variance or document why it remains open.
- Confirm that every adjustment has supporting evidence.
- Check that summary figures agree with retained BAS records.
- Refer uncertain GST treatment or prior-period issues for review.
Reconciliation improves the reliability of the figures, but it does not replace understanding applicable BAS requirements. Use current official information and professional advice where facts are unusual or records do not provide a clear answer.
Stop point: If you cannot explain where a final figure came from, the review is not complete.
GST reconciliation working checklist
| Review item | Records to inspect | Result to record | Stop condition |
|---|---|---|---|
| Reporting period | BAS period, report dates, transaction dates | Period confirmed | Transactions cannot be assigned to the period |
| Sales and GST collected | Sales invoices, credit notes, sales report | Missing, duplicate, or unusual items noted | Sales total cannot be traced to records |
| Purchases and GST credits | Bills, receipts, payment records, purchase report | Records compared with the report | Documents are missing or treatment is uncertain |
| Adjustments | Journals, reversals, credit notes, prior notes | Reason and period documented | Adjustment is unsupported or earlier-period |
| Final figures | Reconciled reports and BAS working papers | Figures agree or differences are explained | Final figures cannot be supported |
When should you stop and get professional help?
Ask for professional review when unexplained variances remain, records are incomplete, GST treatment is uncertain, a prior-period correction or complex adjustment is involved, accounting totals do not agree with retained records, or you are not confident the figures are accurate enough for BAS preparation.
Provide the relevant accounting reports, transaction listings, source documents, reconciliation notes, and a short list of unresolved questions. This gives the adviser a clear starting point.
Advanced Accounting Taxation & Business Services provides BAS preparation and lodgement, bookkeeping, taxation, payroll and Single Touch Payroll compliance, year-end reporting, and business advisory support. Its services information outlines the broader support available.
How cloud accounting and local support can fit the process
The principles remain the same whether your business uses Xero, MYOB, QuickBooks, or another accounting system: define the period, connect summary totals to source records, investigate differences, and retain evidence. Reports and menu options vary between products and versions, so do not assume they contain identical information.
Advanced Accounting Taxation & Business Services supports cloud-enabled workflows through partnerships with Xero, MYOB, and QuickBooks. The Sydney-based firm has offices in Parramatta and Liverpool and works with businesses and individuals across NSW. Support can include bookkeeping, BAS return services, tax advice, and broader small business accounting.
Frequently asked questions
Is GST reconciliation the same as lodging a BAS?
No. Reconciliation checks whether GST figures are supported by the underlying records. BAS lodgement is a separate step that uses figures prepared in line with applicable requirements.
What records should I gather before reconciling GST?
Gather accounting-system reports, sales invoices, credit notes, supplier bills, receipts, bank or payment records, adjustment support, and prior reconciliation notes where available.
What if GST collected and GST credits do not match my accounting records?
Classify the difference and check for missing or duplicate entries, coding issues, timing differences, report settings, and uncertain treatment. Do not force the figures to balance without evidence.
When should a Parramatta business ask an accountant to review its reconciliation?
Ask for help when records are incomplete, differences remain unexplained, treatment is uncertain, or the review involves an earlier-period correction or unsupported adjustment.
Conclusion: Make the figures traceable before BAS lodgement
A reliable GST reconciliation is less about making a report balance and more about explaining how each important figure was produced. Confirm the period, gather evidence, review GST-coded transactions, compare GST associated with sales and purchases, investigate variances, and document supported adjustments.
If records are complete and every difference has a reasonable explanation, you may be able to complete the review internally. If evidence is missing, treatment is uncertain, or a prior-period correction is involved, pause rather than lodge figures you cannot support.
Advanced Accounting Taxation & Business Services offers BAS preparation and lodgement, bookkeeping, taxation, and related accounting support, with a free initial consultation and offices in Parramatta and Liverpool. Contact the firm to discuss your BAS and GST reconciliation needs.