In New Zealand, you can only terminate a fixed-term tenancy before the end date if your tenancy agreement includes a break clause or if your landlord agrees to end the tenancy. A break clause is a provision in the tenancy agreement that allows the tenant to end the tenancy early under specific conditions. These conditions will be outlined in the tenancy agreement. However, you should check your tenancy agreement and also the Residential Tenancy Act 1986 and the regulations under it to see if there are any specific rules and procedures that you need to follow to end your fixed-term tenancy early. It's also recommended to seek legal advice if you have any doubts about the process.