The CIS scheme contains many penalties and risks to Contractors. For more information on how the scheme works, click on the link below for HM Revenue Customs guidance but preferably please contact us for a more detailed explanation. Beware of H M Revenue interpretation on self employed status, it is not law and incorrect, there have been many tax cases on this issue in the last couple of years which detail the current law. Also, care must be taken to ensure gross payment status is not lost through late payments of tax.
https://www.gov.uk/topic/business-tax/construction-industry-scheme