For companies with a 31 March balance date filing GST on a two-monthly basis.
For more info on GST in general click here: http://www.ird.govt.nz/gst/gst-index.html
For a printable copy of the Accountech 2017 Tax Calendar click here: http://www.accountech.co.nz/blog/tax-calendar-2017
For any queries please get in touch