Employment Relations Act 2000, ss 67A, 67B
If you’re a new employee and your employer has fewer than 20 staff, your agreement can provide that you’ll serve a trial period of up to 90 days. If you’re fired during or at the end of the trial you won’t have the right to bring a personal grievance or any other legal action to challenge the firing.
For the trial arrangement to be valid, it has to be put in writing in your employment agreement. The employer also can’t put you on a trial if you’ve worked for them before.