All KiwiSaver investors should be able to find out how their fund is performing, what fees are being charged and where the money is being invested from today.
All providers must publicise the information on their website as part of a new quarterly reporting regime introduced by the Government.
The standardised reporting had been due to start in July but Commerce Minister Craig Foss delayed it to October to allow providers more time to get ready.
Previously there has been no specific reporting requirements on KiwiSaver schemes.
Chris Douglas, head of research at Morningstar, said the regime would allow consumers to know what they were getting and how much it was costing them.