The top-up would be enough to allow them to buy an annuity which would pay them an amount equivalent to NZ Superannuation.
An annuity is a type of insurance policy that provides a regular income in exchange for a lump sum.
New Zealand does not have an established annuity market but there has been some talk between the government and superannuation providers about what it would take to get one going.
Peter Neilson, chief executive of the council, said the proposal did not include dropping New Zealand Superannuation but would be in addition to it, although he expected the age of eligibility to increase over time.
"This not only helps women who may have spent time outside of the workforce, it will also help anyone who has had very low earnings over their adult lives."
The council estimates the top-up would need to be made for less than 10 per cent of the population. But that is only on the proviso that the minimum contribution to KiwiSaver be increased to a combined 10 per cent from the employee and the employer.
Neilson also admitted that the top-up would not help those who did not join KiwiSaver.
The industry has been actively pushing for the government to make KiwiSaver compulsory but so far the National-led government has not bent to their wishes.