Farmers and contractors who have staff must adhere to new minimum employment standards, which were introduced on April 1.
Rural Contractors New Zealand chief executive Roger Parton said employers would be liable for tougher fines if they breached minimum employment standards.
Fines had increased from $10,000 to $50,000 for an individual and from $20,000 to the greater of $100,000 or three times the financial gain for a company.
In addition, directors or senior managers may also be held accountable, if they know about the breaches
''These changes came through last year as result of changes to legislation,'' Mr Parton said.