You should register for the Construction Industry Scheme (CIS) if you work for a contractor in the construction indistry.
Under the CIS scheme, your contractor will deduct 20% from your payments and pass it to HMRC as a form of advance payment towards your income tax and national insurance.
If you do not register for the scheme, the contractor will deduct 30% from your payments instead of 20% (GOV.UK, n.d.).
Complete the Order Form below for us to register you for the CIS Scheme as a sub-contractor.