 He continued to promote the concept in submissions to IRD and one to the McLeod Review of Taxation when moved to the New Zealand Dairy Board (now Fonterra).In 2001, when IRD publicly raised the possibility of trading provisional tax payments as a means of reducing exposure to use of money interest, Ian engaged with IRD officials by helping to write legislation and come up with an actual system that would bring together taxpayers, an independent intermediary and IRD.He left the Dairy Board a year later to establish Tax Management NZ.