How this usually works
A strong gst bookkeeping process starts with a quick health check: ABN and GST registration details, cash vs accrual basis, BAS frequency, software settings, current pain points, and any overdue periods.
Then the workflow typically follows these steps:
- Set up software correctly (Xero, MYOB, QuickBooks): tax rates, GST codes, chart of accounts, bank feeds, user permissions, document capture.
- Capture and code transactions with clear GST rules for common suppliers, subscriptions, fuel, overseas purchases, and mixed-use items.
- Reconcile bank, clearing and GST control accounts; fix miscodes and duplicate postings.
- Prepare BAS workings, review variances period‑to‑period, attach evidence, and get sign‑off.
- Coordinate BAS lodgement with a BAS agent, track ATO payments/refunds, and diarise the next due date.
- Close the period with simple reports so tax and management decisions stay aligned.
Australian context to keep in view
- You generally must register for GST if projected turnover is $75,000 or more ($150,000 for non-profits). Register within 21 days of knowing you will pass the threshold.
- Choose the correct basis: cash (GST when paid/received) or accrual (GST when invoiced). Your BAS settings and software must match.
- Quarterly BAS is common; some businesses lodge monthly. Keep your bookkeeping cadence aligned to your BAS cycle.
- Watch GST‑free vs input‑taxed items (e.g. basic food, health, residential rent), imports/exports, and government fees that don’t include GST.
- Only a registered BAS agent or tax agent can lodge a BAS for a fee. Many teams pair a bookkeeper with a BAS agent for review and lodgement.
Common GST mistakes to avoid
- Using the wrong tax code (e.g. FRE vs N-T) for GST‑free vs out‑of‑scope items.
- Claiming full GST on mixed‑use or private expenses without apportioning.
- Treating overseas purchases and digital services as GST‑free when reverse‑charge rules apply.
- Posting Stripe/Shopify/PayPal fees incorrectly so GST and payouts don’t reconcile.
- Missing GST on deposits, prepayments, and progress claims under the chosen basis.
- Incorrect GST on motor vehicles, FBT‑related entertainment, and government charges.
- Not reconciling GST control accounts to BAS totals each period.
What to compare before you commit
Scope
Confirm the scope matches your gst bookkeeping need: setup, coding, reconciliations, BAS preparation, BAS lodgement via a BAS agent, cleanup, and catch‑up work if you’re behind.
Software fit
Choose a provider fluent in your stack (Xero, MYOB, QuickBooks, Dext, Hubdoc) who can explain why codes and workflows are set a certain way.
Turnaround and communication
Agree review cycles, escalation paths near BAS deadlines, and how you’ll share documents and approvals.
Qualifications
Check BAS agent registration for lodgement, bookkeeping certifications, and experience with your industry and ATO interactions.
Commercial fit
Compare fixed vs hourly, inclusions, cleanup pricing, and whether you want compliance only or ongoing advisory.
Documentation
Look for clear BAS workpapers, notes on unusual items, and a simple audit trail for ATO queries.
Best next steps
Write down the outcome you want: clear coding rules, cleaned‑up file, BAS lodged, overdue periods caught up, or a switch to cash/accrual with proper documentation.
Gather basics before you reach out: ABN, GST registration date and basis, BAS frequency, current software, how many bank accounts and monthly transactions, and any overdue activity statements.
If you’re comparing providers, review their scope, BAS agent involvement, and reporting rhythm. If you’re ready to act, send a copy of your last BAS and give view‑only access to your file for a quick assessment.
Frequently asked questions
What does gst bookkeeping include?
It includes correct GST and BAS settings, consistent GST coding on sales and purchases, bank and clearing reconciliations, GST control account checks, BAS workpapers and review, and coordination of BAS lodgement with a registered BAS agent.
Do I need a BAS agent to lodge my BAS?
Yes, if you want a paid professional to lodge for you, they must be a registered BAS or tax agent. A bookkeeper can prepare the data, while the BAS agent reviews and lodges and can speak to the ATO on your behalf.
Should I use cash or accrual for GST?
Cash works well for many small businesses because you report GST when money moves. Accrual reports GST when invoices are issued/received. Your ATO registration and software must match, and changing basis requires an adjustment.
How often do I need to lodge BAS?
Usually quarterly; some lodge monthly. Make sure your bookkeeping cycle matches your BAS due dates to avoid rushed clean‑ups and penalties.
What records do I need to keep for GST?
Valid tax invoices and adjustment notes, import documents, and evidence for apportionment and reverse‑charge decisions. Keep records for at least five years; digital copies are fine if complete and readable.
How much does gst bookkeeping cost?
It depends on volume, software, clean‑up needs, BAS frequency, and whether a BAS agent lodges for you. Many choose a fixed monthly fee that bundles coding, reconciliations, GST review and BAS preparation.