Under the provisions of the Holidays Act 2013, an Employee is entitled to 4 weeks paid holidays after being with the same Employer for 12 months continuously. However if the employee's service is not continuous for the 12 months, such as having taken leave without pay, then their anniversary date and holiday pay calculations could be affected.
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www.employers.co.nz/unpaid-leave-and-annual-holidays-dec-2013-newsitem.aspx