Business Activity Statement cycles depend on your GST registration turnover and whether you report monthly or quarterly. Most SMEs lodge quarterly, with the ATO's pre-lodgement timeline setting the rhythm.
The avoidable stumbles are almost always administrative: bank data not reconciled in time, missing tax invoices, or a director assuming the bookkeeper has it handled without a confirmation.
We keep clients on a rolling lodgement calendar so there's never a 'due tomorrow' surprise. Clean books month-to-month make BAS a 30-minute job, not a fire drill.