Labour inspectors are investigating claims than an Auckland restaurant chain is paying workers $4 an hour.
Employment and migrant worker advocates spoken to by the Weekend Herald say such illegal wages are common in some sectors of the hospitality industry.
The Ministry of Business, Innovation and Employment is looking into complaints about an Auckland restaurant chain allegedly paying an "Indian salary".
Its labour inspectorate started an investigation after a significant number of individual complaints were received. Some workers claimed they got paid $265 a week for up to 70 hours' work.
Workers alleged they did not get holiday pay or sick leave, were required to pay between $10,000 and $20,000 to secure their jobs while obtaining residence, and were kept in overcrowded accommodation for which money was deducted from their wages.