Tax returns deadlines:

Income tax due date: Don’t forget that the 7th July is the final date for filing income tax returns if you don’t have a tax agent with a valid extension of time.
GST due date: May/June Return due 28th July
PAYE due dates: 20th of each month

Click here to download the IRD PDF single page tax calendar 2012-2013

Click here to view the IRD website