In both instances new staff need to fill out a KS-2, to get contributions under way. This form stays on file with the employer until seven years after staff leave a job.
I asked the IRD what happens when an employer unintentionally neglects to make deductions and contributions to KiwiSaver.
"It really depends on whether the employer was required to make KiwiSaver deductions or employer contributions," says the IRD.
"The first thing you need to do is get in contact with us.
"If your liability to pay employer contributions is backdated then late payment penalties would be applied to each period that requires an adjustment and Inland Revenue may apply 'failure to deduct' penalties. Doing nothing will only make the problem worse."
It is up to bosses to keep a record of staff who are KiwiSaver members, their contribution rate, the amounts deducted, employer contributions made and any notification of contributions holidays or opt-outs.
For details on enrolling new staff see the KiwiSaver Employer Guide put out by the IRD.
The guide has a section on penalties. For employees concerned about KiwiSaver payments, check My KiwiSaver, to see if contributions are being received by the IRD and forwarded.