REVENUE chiefs in Ireland have reaped an extra £69 million in tax revenue during a CIS-style clampdown across the country.
The Irish Revenue Commissioners ordered a quarter of their inspection team to investigate contractors this year.
And the crackdown has seen more than 3,000 audits carried out on construction and 1,457 site visits.
Inspectors have been checking that contractors are correctly registered as either self or directly employed and ensuring firms are sending in correct annual returns and complying with VAT laws.
A revenue spokesman said: 'The workforce is now highly mobile and this mobility has caused problems in ensuring that all of the activities of an operator are properly compliant from a revenue perspective.'
The clampdown is also affecting UK contractors working in Ireland.
Clive Fathers, a partner at accountant Grant Thornton, said: 'The Irish revenue construction project will come down equally hard on British contractors, not only on the ssue of employment status, but also with regards to PAYE, unregistered labour, salary substitution and the remittance basis for non-nationals.'