Transferring KiwiSaver providers takes between 5 and 10 business days. However, applying to switch KiwiSaver providers only takes 5 minutes. Once you have applied to change providers, your new KiwiSaver provider communicates this to the IRD and your current KiwiSaver provider. Your funds will then transfer from your current KiwiSaver provider to the IRD, and then onto your new KiwiSaver provider to be invested in the fund of your choice.
