All KiwiSaver providers will charge you fees for investment, management and administration costs. Your investment statement will set out the fees charged. The fees are then deducted from your KiwiSaver account.
The KiwiSaver Act prevents the charging of unreasonable fees and this is monitored and reviewed by the Financial Markets Authority http://www.fma.govt.nz
Fees can have an impact on your savings and investment returns. It is important that you understand how much fees you are being charged by your KiwiSaver provider.
You can also visit http://www.sorted.org.nz and use the KiwiSaver fee calculator that they have available for use. Sorted is a small government funded but independent organisation that is dedicated to helping New Zealanders manage their personal finances throughout life and their website has lots of useful tools and information.