Happy New (financial) Year! Don't miss these BUSINESS YEAR END DATES June 2018 quarter The June 2018 Quarter BAS is due to be lodged and paid to the tax office on or before July 28th, 2018 or August 25th, 2018 if lodged through our office. Superannuation Guarentee Pay April-June 2018 quarter employee super before June 30th to enable the tax deduction in the 2017 financial year. The final legislave deadline for the June 2018 Quarters Super is July 28th, 2018. 2018 PAYG Payment