These Regulations amend the Income Tax (Construction Industry Scheme) Regulations 2005 (S.I. 2005/2045) (the “2005 Regulations”) to enable Her Majesty's Revenue and Customs (“HMRC”) to require security or further security for the payment of sums in respect of which a contractor is, or may be, accountable to HMRC under either section 61 of the Finance Act 2004 (ch. 12) (“FA 2004”) or the 2005 Regulations.