The girl's mother plans to invest the money and give her daughter access when she's older.

A gift from great grandma has made a primary schooler $100,000 richer.

The eight-year-old Waikato girl won the money in the August Bonus Bonds draw, though her mother says the youngster still doesn't understand quite what it will mean.

"My daughter just wanted to spend the money on buying me a new car, and saving our dog from being put down, but I won't be touching the money - it's not mine to spend," the mother-of-two said in a statement.

Bonus Bonds are part of an investment scheme managed by ANZ - each $1 bonus bond is an entry into the monthly prize draws.

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The winning bond was bought by the girl's 92-year-old great grandmother, who has been buying the bonds for family for years.

She has been telling all her friends at church about the win, a statement said.

In fact, the win has buoyed the whole family, according to the girl's mother.

"The rest of the family have gotten more of a kick out of it than my daughter. She doesn't yet understand the enormity of it."

"It means less worry for us. I would be concerned for the girls if something happened to me. I am a single mum you see and my mum has cancer."

This win would be "an extra financial buffer" for her younger daughter which would set her up for the future, she said.

She plans to invest the money for her daughter, who will be able to access it when she is older.

This is not the first time a young bondholder has won a major prize.

In 2016, a three-year-old won the main prize of $1 million.