 In October 2007, after 3 months of operation, 200,000 people had signed up, leading Revenue Minister Peter Dunne to say that 

If take-up continues at this rate it might be easier to make the scheme compulsory, thereby removing the employer compliance costs associated with people opting out.However he said that these were his personal views and not those of the government.On 6 December 2007, 5 months after the start of KiwiSaver, it was announced that 316,000 people had signed up.