Prime Minister Jacinda Ardern says she'll be backing a Bill legalising assisted dying in order to let individuals make their own choices.
Act leader David Seymour's fiercely debate End of Life Choice Bill is expected to have its second reading in the House on Wednesday evening, with MPs voting individually based on their consciences, rather than by party lines.
Ahead of the vote, Ardern said while there would be a range of personal views within Labour, she would be backing the Bill, as she did during its first reading.
"It's been my view that while there are a range of strongly-held beliefs, and people have the right to hold those, I ultimately want people to make their own individual decisions," she told reporters.
"The best way I can do that is by enabling them to have that choice and by voting in favour."