Government officials say lifting the minimum wage to $16.50 an hour could see a loss of up to 3000 jobs.
Boosting the minimum wage was part of the Government's 100-day plan and is set to take effect at the end of next week, on April 1.
In its regulatory impact statement, officials from the Ministry of Business, Innovation and Employment said an increase "may have negative employment impacts which include lower job growth and reduced work hours".
"The estimated restraint on employment for a minimum wage of $16.50 is 3000," the statement said.
It also noted that the effect on employment "is heavily debated in economic literature ... there is no clear consensus".