Lynch said the Fisher offer would be cheaper than its current scheme, which is outsourced to Mercer, while serving up the existing standard conservative, balanced and growth investment options.
As well, he said Fisher would not be granted unrestricted marketing access to NZACU members.
The existing 4,200 members will be sent transfer packs explaining the deal.
Any new members the NZACU recruits to Fisher would earn the group $50 for employed members, $30 for self-employed and $10 for those members aged under 18. As well, the group would retain a small ongoing stake in the scheme with 0.1 per cent of funds under management payable to the NZACU annually - that's about $30,000 based on the current total.
All up, it's unlikely the NZACU would recoup its KiwiSaver set-up costs but it has limited future losses.
Lynch said with 170,000 credit union members nationwide there remained plenty of untapped KiwiSaver potential. To make the most of that potential, however, the credit unions may have to adopt a bank-like attitude and cross-sell like crazy.