The Acorn Foundation is celebrating its first 10 years this year and has grown from one donor fund in 2003 to 187 donor funds worth $8 million invested today.
The foundation works on an annual return-to-community rate of 5 per cent and will give about $400,000 to local community and charity groups this year.
But it will not be long until Acorn is annually giving 10 times that amount, founder Bill Holland said.
People throughout the district have written wills to include Acorn as a beneficiary of some portion of their wealth when they die, he said.
"If everybody dies tomorrow - which they obviously won't, I hope, because I'm one of them - we anticipate somewhere between $100 million and $150 million, which is huge."