The right to vote is an inherent right of New Zealanders. The law establishing this right and stating the eligibility requirements for voting are contained in the ELECTORAL ACT 1993.
To be able to vote in a general election in New Zealand you must satisfy all of the following conditions:
To be qualified to enrol in an electorate, the electorate must be the last in which you have lived continuously for at least a month.
Yes, New Zealanders have a legal obligation to enrol to vote, and may be fined if they do not enrol.
You retain the right to vote if you are travelling at the time of the election. If you know that you are going to be away, you may be able to cast your vote early; you can find out if this is possible by contacting the Returning Officer for your electorate once the time for nominations has closed. If you have not been able to cast an early vote and you are out of your electorate on election day, you can cast a special vote at any polling booth.
You can even cast a vote if you are overseas. You should contact the nearest New Zealand diplomatic representative (such as a NZ Embassy or High Commission) and they will help you arrange to vote.
If you are awaiting trial in prison, you can vote. But if you're serving a prison term after having been convicted you do not have the right to vote.
Once you have been released from prison, your right to vote will be restored.