Acorn Foundation general manager Nicky Wilkins presented the award at the ceremony.
Ms Wilkins said the donor set up the fund to support their passion for literature and support the development of writers in New Zealand.
"Our generous donor passionately believes that great literature not only entertains but nourishes both the intellect and the imagination, and that these attributes are amply demonstrated in the best of New Zealand writing, but unfortunately have been poorly rewarded in the past."
"New Zealanders are avid readers, and have a huge appetite for good fiction. We also have some exceptional writers in this country, but for some reason we don't recognise that - only 5% of books read in New Zealand are by local authors," she said.
The Acorn Foundation Literary Prize now stood proudly alongside other top international literary awards including Australia's Miles Franklin award ($60,000) and the Man Booker prize (£50,000).