KiwiSaver: Are you missing out on money?

A recent article by Stuff explained how Kiwis can lose thousands of dollars by investing in the wrong fund. However, many Kiwis felt they were not getting enough information on choosing the right fund for their investments.
Over 400,000 KiwiSaver members missed out on $1b, warn advisers

As per an article by the NZ Herald, over 400,000 KiwiSaver members who are in default funds may have missed out on $1 billion over the last six years because they are in the wrong type of fund and are being over-taxed. This was based on a report by a group of nine financial advisers.
IRD sending one million letters to Kiwis on wrong KiwiSaver tax rate

The Inland Revenue Department will send more than one million letters to people on the wrong tax rate for KiwiSaver this year.