Haulage contractor Mary McKinney, from Riverside, Cockhill Road, Buncrana, Co Donegal, has been sentenced to three years imprisonment on 15 counts of delivering incorrect VAT returns.
The sentence for 15 offences was suspended on condition she complete 240 hours of community service.
In other cases Danny Doherty, a mechanic in Gulladuff, Moville was fined more than €400,000 in tax and penalties.
Colm Harvey, a company director on the Clar Road, Donegal Town was ordered to pay €391,000, Edward Rodgers of Aughalatty, Carrigart paid back revenue of €196k and building contractor Columba Doherty, Dundrain, Burnfoot paid back €102.
Company Director William McNutt Jnr from Downings paid back €40k and Kenneth Carson of New Begginings at the Court Yard Shopping Centre, Letterkenny paid back €50k.
In the period covered there were 20 cases taken against people in Donegal for failure to lodge income tax returns with fines totalling more than €30k issued.