The June quarter Business Activity Statement is often the trickiest one of the year to get right. It doesn't just report three months of GST and PAYG withholding, it also lines up with the end of the financial year, which means any errors here have a habit of flowing straight into your annual tax return.
Getting your Q4 FY2026 BAS right matters more than most business owners realise. It's not just a compliance box to tick, it's also one of the clearest signals of how accurately your books have been kept all year.
Your quarterly BAS brings together several reporting obligations into one lodgement. For most small and medium businesses, this includes:
Because this quarter also marks the end of the financial year, it's the point where any discrepancies between your BAS figures and your annual accounts tend to surface. Getting the numbers right now saves a lot of reconciliation work later.
GST is usually the largest single component of a BAS, and it's also where most errors occur. A few areas worth paying close attention to for the June quarter:
Reconciling your GST clearing account against your BAS figures before lodging is one of the simplest ways to catch errors before they become a problem.
PAYG withholding for Q4 should reconcile closely with your Single Touch Payroll data for the same period, since both are reporting the same wage and withholding figures to the ATO.
Before lodging, it's worth checking:
Discrepancies between PAYG withholding reported on your BAS and your STP data are one of the more common triggers for ATO follow-up, so it's worth resolving any gaps before you lodge.
Even experienced business owners run into the same handful of issues each quarter. Watch out for:
Most of these mistakes stem from the same root cause: reconciliation happening too late, or not at all, before the BAS is prepared. A monthly reconciliation habit throughout the year makes the Q4 lodgement significantly smoother.
Because Q4 sits at the intersection of quarterly compliance and annual reporting, errors here don't stay contained to a single BAS. They tend to carry through into your year-end financial statements and, in some cases, your income tax return.
Taking the time to reconcile properly this quarter isn't just about meeting the 25 August deadline, it's about starting the new financial year with accurate, reliable numbers.
1. When is the Q4 FY2026 BAS due? If you lodge through a registered tax or BAS agent, the due date is 25 August 2026. If you lodge your BAS yourself, the standard due date is 28 July 2026.
2. What period does the Q4 BAS cover? April, May and June 2026, the final quarter of the 2025–26 financial year.
3. Can I fix an error after my BAS has been lodged? Yes. Most errors can be corrected by lodging a revision or including an adjustment on your next BAS, depending on the size of the error and how much time has passed.
4. Why does my BAS need to match my annual accounts? Discrepancies between BAS figures and annual financial statements can trigger ATO review, and they also make it harder to prepare an accurate tax return.
5. Should I reconcile monthly even though BAS is quarterly? Yes. Monthly reconciliation catches errors early and makes quarterly BAS preparation far quicker and more accurate.
The June quarter BAS carries a bit more weight than the others, simply because of where it sits in the financial year calendar. A careful approach to GST and PAYG withholding, combined with good reconciliation habits, makes this lodgement, and the tax return that follows it, considerably easier to get right.
Need help preparing your Q4 BAS or reviewing your GST and payroll reporting before lodgement? Get in touch with the Rubiix team or explore our taxation services to find out how we can help.
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