Deductions are what is taken out of your pay per month or per week, depending on how often you get paid. The deductions will include tax and national insurance and could also include pensions and student loan payments. The deductions are taken out of your wages, again depending on your employment status.
A direct link is a link that HMRC would make to reclassify a sub-contractor as an employee. Using a company such as Indigo CIS would mitigate the risk of a sub-contractor that a contractor is using on-site as being a direct employee. Indigo takes on the role of a commercial contractor and removes the direct link between a contractor and a subcontractor. It verifies the subcontractor with HMRC and engage the workforce under professionally vetted and bespoke contracts, considering the regulatory requirements of a subcontractor’s self-employment status.