5 May
PAYE for 16th to end of last month (large employers)

7 May
GST for periods ending 31st March
Provisional Tax 3rd instalment

20 May
PAYE for last month (small employers)
PAYE for 1st-15th this month (large employers)

28 May
GST for periods ending 30th April

31 May
FBT for 2016 year and quarter ending 31st March