"There was a considerable amount of tax evaded," said Mr Hobbs.
"The victim of tax evasion is the community."
He said Sinclair needed to be held to account for the harm he had caused.
"You do not seem to understand the seriousness and importance of meeting your tax obligations."
Inland Revenue lawyer Roslyn Park emphasised the "seriousness" of the offending as the tax system was based on "voluntary compliance".
She said Sinclair had built up a debt of over $170,000 - including interest and penalties - over a five-year period and had given the department "misleading information".
Full reparation from Sinclair was unrealistic, she said, and an amount of community work as part of his sentence would be appropriate.
Solicitor James Elliot, who represented Sinclair, suggested he could do some mentoring work at a local marae with his construction skills. Sinclair had a previous conviction from 1987, the court was told.