New Zealand Prime Minister John Key says the country’s general election will be held on September 20.

The New Zealand general election will be held on September 20, Prime Minister John Key has announced.

He cited his attendance at the G20 summit in Brisbane in November and a possible six to eight weeks of forming a government as the reasons for holding an election in September.

Under the Electoral Act, the latest date for the election would be mid-January, but holidays make that impractical.

Speaking at his post-cabinet press conference on Monday, Mr Key would not say whether a referendum on changing New Zealand’s flag would also be held on September 20.

He said he’d be making a speech about the flag on Tuesday.