The Government is investigating a proposal to see new KiwiSaver members increase their contribution from three per cent up to 10 per cent, in half a per cent a year increments.

But it could hit workers in the pocket by reducing their take home pay packet.

The union believes employers should shoulder some of the rise rather than just workers.

Australia will next month lift its compulsory employer superannuation contribution rate from 9.5 per cent to 10 per cent of wages or salary - and up to 12 per cent over three years.

David Boyle, head of sales and marketing for Mint Asset Management, joined John MacDonald to discuss the proposal and whether it would suit Kiwis better.