Immigration NZ and the Labour Inspectorate are checking workers’ records thoroughly. If you don’t keep the right records, you can expect to pay a penalty. So:
If you are employing, check all applicants’ documents, especially qualifications and work experience. When you employ a person, keep a copy of those documents.
Make sure you keep clear and accurate time and wage records.
If you are employing international students, under the rules of their visa each of them is only allowed to work 20 hours per week (except for the Christmas/New Year holidays when they can work full time)
Despite the shortage of talent, if you have a migrant employee and his or her visa is about to expire you must in most cases re-advertise the job and prove there is not a New Zealander available for it before the work visa will be renewed.