Tax rate changes for MacBusiness Payroll for 1 April 2017 have been released:
You can go to Setup, click the "Tax/ACC/KiwiSaver tab", and click "Update Tax Rates" to load these new rates any time from now. The new tax rates won't be applied until you load a pay with a payment date in April.
Alternatively, you will get a prompt from Payroll to update them automatically when you load your first pay with a payment date in April.