The Lodgement Requirement Most People Get Wrong
If a business is registered for GST, it has to lodge a BAS for every reporting period, including periods where nothing happened. No sales, no purchases, no payroll. Doesn't matter. The obligation sits with the registration, not the activity. The ATO doesn't send reminders when a nil period comes around. The clock just starts on the due date and keeps running until the statement lands.
This catches clients out more often than it should. A business that pauses for a quarter, goes dormant while the owner is travelling, or simply has a slow period assumes there's nothing to do because there's nothing to report. That assumption is wrong, and the penalty doesn't care why the lodgement was missed.
The same logic applies for businesses winding down. Until GST registration is formally cancelled with the ATO, the lodgement obligation stays live. Firms managing clients through a closure need to make sure the deregistration is processed before assuming the BAS cycle has ended.
What the Penalty Actually Looks Like
The ATO applies a Failure to Lodge penalty for late BAS submissions, including nil ones. As of 1 July 2025, the penalty unit is $330. That applies for every 28-day period, or part thereof, that the BAS remains overdue. For small businesses it caps at five penalty units, which is $1,650 per late statement.
A nil BAS lodged on time costs nothing. That same nil BAS lodged two months late costs $660. Three months late, $990. The numbers aren't enormous, but they're real, they compound across multiple periods, and they accumulate fast if a client has been dormant for more than one quarter.
There's a nuance worth knowing. The ATO's general practice is not to issue a penalty for a first-time late lodgement if the result is nil or a refund, but that's an administrative practice, not a rule, and it doesn't apply if a penalty had already been raised before the statement was lodged, or if the client has a pattern of late lodgement. Firms that manage dormant clients can't rely on goodwill here. The safer approach is to treat nil periods the same as any other quarter and lodge them on time.
The Takeaway
A nil BAS is not an optional lodgement. GST-registered businesses owe the ATO a statement every reporting period, regardless of whether any transactions occurred. The penalty for missing it starts at $330 and can reach $1,650 per late statement for small entities. The practical fix for firms is simple: treat dormant client periods as a workflow task, not a gap. Flag clients who are likely to go quiet, lodge their nils on schedule, and make sure any genuine closures have the GST registration cancelled before the next period kicks in. A missed nil BAS is one of the most avoidable penalties on the books.
