So it wasn’t 6 years as previously indicated to me, it is in fact 4 years in jail (Mt Eden Correctional Facility) that he has been sentenced to.
So apparently he will be eligible for parole in 1/3 of that, with time served counting.
Here’s a link to the Herald article about it: http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=11767588
This is what he did:
McDonald had been a registered tax agent since 2002. Between 2007 and 2013, he failed to pay client tax money to Inland Revenue, and filed about 250 false GST and income tax returns either to get money from IRD or to keep client funds. McDonald also made false entries in one client’s financial statements to conceal his offending.