"It's a very complex case with no obvious mitigating features and resulted in a more than $2-million dollar loss to the Commissioner of Inland Revenue.
"Most clients were participants in one network marketing scheme, and they placed their trust in her as their accountant. Yet nearly 100 separate refunds for clients were paid into the defendant's bank accounts and it appears only 40 were forwarded to clients."
Monzon, who was never registered as a tax agent with Inland Revenue, worked in the accounting industry in New Zealand for at least 20 years.
She continued to provide "accounting" services to clients even after she applied for and was adjudged bankrupt in August 2012.
Monzon is the second accountant this month to be sent to prison for tax fraud.
Hamilton chartered accountant Megan Nyree Findlay was jailed for three years after stealing $740,000 from the Inland Revenue Department over seven years.