when is gst due for march 2015
7 May: GST returns and payments are due for the period ending 31 March 2015. The third instalment of 2015 provisional tax is due if you use the standard or ratio methods and have a 31 March balance date.The third instalment of student loan interim assessments is due if you have a 31 March balance date.he 2014 Fringe benefit shareholder/employee income year tax return (IR421) and payment are due 7 April 2015 if you have a balance date between March and September and a tax agent or accountant with a valid extension of time.