Immigration New Zealand has collected nearly $3 million in fees it legally could not charge clients for.
An internal email sent to visa processing staff on January 28 by the agency's visa services general manager, Nicola Hogg, said staff had been wrongfully charging applicants who wanted a variation of conditions on their visas since November 2010.
"We have become aware the fee for a variation of conditions on a temporary visa is not correctly reflected in the Immigration Regulations 2010," she said in the email.
"As a result you cannot charge customers for this type of application."
Immigration had received an average of 684 applications each month since November 2010, and clients were asked to pay $165 each.