Up to April 2021 the contractor is responsible for figuring out if they fall inside or outside IR35 and then paying their taxes accordingly.
The new IR35 legislation (to be introduced in April 2021) shifts responsibility for assessing IR35 obligations from the contractor to the company that uses the contractor. That directly impacts on IT Directors and Managers who are in recruiting positions and, as such, are responsible for hiring individuals. Therefore, if you are an IT Director or Manager who directly recruits a contractor you will become wholly responsible for their IR35 determination.
Hiring Managers will be responsible for: