Generally, the lodgement date for an SMSF is 15th May of the following year, if the Fund is lodged through a tax agent.
However, this date is brought forward to 31 October if the Fund is lodged by the member or if it was late the previous year.
So, a Fund that missed the 15 May 2017 lodgement date for the 2016 Annual Return will generally be required to be lodged by 31 October 2017.
If your Fund is new, then the date is 28 February of the following year.
It is a good idea to check with your accountant to make sure that you have all your information available so that you meet the Fund deadline to avoid late lodgement fines!