Launceston men Kazuhiro Kojima and Zhicheng Zhang - who own and operate 'Bento Box' restaurants in Launceston and Devonport and the Wan Japanese Restaurant in Launceston - have each been individually fined $27,984.
The company that Kojima and Zhang are directors and part-owners of, Bento Kings Meadows Pty Ltd, which operates the Bento Kings Meadows restaurant at Launceston - has been fined $122,960.
The fines, imposed by Judge John O'Sullivan in the Federal Circuit Court, are the result of legal action taken by the Fair Work Ombudsman after an investigation into underpayments.
The fines were imposed after it was admitted that 50 employees across the four restaurants were underpaid a total of $105,738 in 2010 and 2011.
The employees were predominantly young foreign nationals from Asia, including some who spoke limited English. A number were international students who performed food preparation, customer service, cleaning and cooking duties.
The employees were paid flat rates as low as $5 to $10 an hour, well below minimum entitlements and which resulted in the significant underpayments of their base rates and non-payment of penalty rates for weekend, evening and public holiday work. Record-keeping and pay slip laws were also breached.
Individual underpayments ranged from $90 to more than $12,000. The underpayments have now been rectified in full.
Judge O'Sullivan said the breaches were serious and Kojima and Zhang had "displayed a reckless disregard for their obligations".
"The respondents' submissions on this issue effectively amounted to a plea of ignorance or an assertion that they were so ignorant they didn't know any better," Judge O'Sullivan said.
"There is a need for general deterrence and to ensure employers understand they must take steps to ensure correct employee entitlements are paid."
Fair Work Ombudsman, Natalie James, said the case sent a very strong message that underpayment of workers would not be tolerated, particularly vulnerable workers.
"Foreign workers can be vulnerable if they are not fully aware of their workplace rights, so we treat underpayments of foreign workers very seriously and will not hesitate to take action in cases such as this one in Tasmania," James said.