This list of key dates is not comprehensive – it is a guide only. Events or timelines may change. Unless otherwise stated, the due dates provided are for 30 June balancers only. When a due date falls on a Saturday, Sunday or public holiday, you can lodge or pay on the next business day. The payment due dates for a tax return are determined by client type, the lodgment due date and when the return is lodged. Source: Australian Taxation Office (30 June 2017).