Prime Minister John Key said the date of this year's general election may be influenced by whether any G20 leaders take up an invitation to come to New Zealand.
The Government has invited world leaders attending the G20 summit in Brisbane on 15 and 16 November to extend their trip and visit New Zealand.
New Zealand is not a member of the G20 group of leading nations because it is too small, but Mr Key will go at the invitation of his Australian counterpart Tony Abbott, who will chair this year's meeting.
"Going there, and the opportunity for these leaders to come is important for whoever the prime minister and the government of the day are, so that is a factor that I'm clearly weighing up," Mr Key said.
Mr Key said there were a couple of other factors he was taking into consideration in deciding on a date.
The last election in 2011 was held on 26 November.