The income comes from investment returns and using up the capital.
Although the value of the investment can go up and down over time investors are guaranteed a minimum income through the fund buying insurance via a company called Lifetime Income Group.
Lifetime was launched by former ACC and AXA chief executive Ralph Stewart in 2015.
This insurance also kicks in if they live long enough to chew through all of their investment money.
Simplicity chief executive Sam Stubbs said too often retirees had to choose between very low term deposit rates with break fees, or overly risky investments.
"They deserve better."
Stubbs said the fund was aimed at allowing people to top up New Zealand Superannuation to meet their regular living expenses.
He said a person with a $100,000 investment would receive an income of $192.31 every fortnight for the rest of their lives.
The fund has a $30 annual member charge plus a 1.6 per cent per annum fee.