How this usually works
A solid quarterly bas process starts with access and a quick review of your current position: business structure, GST registration and method, software (Xero, MYOB, QuickBooks), payroll setup, and any ATO notices or overdue quarters.
Then the work moves through clear stages:
1) Bookkeeping tidy-up and reconciliations — bank and credit card reconciliations, debtor/creditor reviews, GST coding fixes, and payroll/STP checks (including super and PAYG withholding).
2) Prepare BAS labels — confirm G1, 1A and 1B for GST; W1 and W2 for PAYG withholding; T1/T7 if you pay PAYG instalments; add fuel tax credits or wine/luxury car tax where relevant.
3) Pre‑lodgement review — verify tax invoice evidence, adjustments and rounding, reconcile BAS figures back to ledger balances, and ensure the activity statement aligns with management reports.
4) Lodgement and payment — lodge via Online services for agents or the business portal, then schedule payment or arrange a payment plan if needed. See BAS Lodgement for detail.
5) After‑lodgement actions — store the BAS and workpapers, note the next due date, and lock the period to prevent changes. If issues were found, consider a quick BAS Review or plan BAS Corrections for prior periods. If you are behind, use BAS Catch Up Services.
Australian context to keep in view
- Quarterly bas reports GST, PAYG withholding and (if applicable) PAYG instalments to the ATO; some businesses lodge IAS monthly when not registered for GST.
- Quarterly due dates are normally 28 Oct (Q1), 28 Feb (Q2), 28 Apr (Q3) and 28 Jul (Q4). Registered BAS agents often have extended deadlines around Q1, Q3 and Q4.
- Choose the correct GST method: cash is based on money received/paid; accrual is based on invoices/bills issued. The method must match your registration and software settings.
- GST registration is usually required once projected or actual GST turnover reaches $75,000 ($150,000 for not‑for‑profits). Many ride‑share drivers must register from $1 turnover.
- Single Touch Payroll affects W1/W2 and super visibility; payroll errors often flow into your BAS. Reconcile payroll before you reconcile BAS.
- Keep tax records for at least five years. Ensure valid tax invoices and credit notes exist for all material GST claims.
What to compare before you commit
Scope
Confirm the scope really fixes your quarterly bas issue: bookkeeping cleanup, review, lodgement, prior‑period amendments, and whether you want ongoing quarterly support.
Software fit
Look for depth in your platform (Xero, MYOB, QuickBooks), including GST settings, BAS codes, payroll/STP, bank rules, and reports that tie to BAS labels.
Turnaround and communication
Ask how far ahead of the due date they start, how they chase documents, what happens if issues appear late in the quarter, and who signs off before lodgement.
Commercial and compliance fit
Compare fixed vs hourly fees, meeting rhythm, and whether they are a TPB‑registered BAS agent or tax agent. Clarify if advice extends to cash vs accrual method, GST apportionment and ATO payment plans.
Best next steps
Write the exact outcome you want: on‑time lodgement, prior‑period fixes, a clean handover from your old system, or a process that runs smoothly every quarter.
Shortlist providers against that outcome, not just a title. The right fit explains the workflow, sets deadlines clearly, and shows how figures reconcile back to your books.
If you are ready to move, request quarterly BAS help now, or read more about BAS Lodgement and BAS Review to refine your brief.
Frequently asked questions
What does quarterly bas usually involve?
For most businesses it involves reconciliations and coding checks, preparing GST and PAYG labels, a pre‑lodgement review, then lodgement and payment arrangements. Where earlier quarters contain errors, you may add BAS Corrections or do a one‑off BAS catch‑up before resuming a normal quarterly cycle.
How do I know if this service suits my business?
It suits businesses registered for GST or paying PAYG instalments/withholding that want accurate, on‑time reporting. Typical triggers include GST coding uncertainty, payroll issues feeding into BAS, ATO notices, or limited time near deadlines. If you are new to GST, start with BAS Setup.
What should I compare before choosing a provider?
Compare scope, fees, software capability, and turnaround times in the last two weeks before the due date. Confirm they are TPB‑registered, ask how they reconcile BAS labels back to your ledger, and check whether they offer proactive guidance, not just lodgement.
What should I read next?
Go deeper with BAS Lodgement, BAS Review, BAS Corrections, BAS Catch Up Services, and BAS Agent for Small Business. If you prefer a guided match, use the form below.