Understanding IR35 Status Determination
Learn about IR35 status determination, key factors impacting employment status, and the role of small private sector organizations in assessments.

Understanding IR35 Status Determination: A Guide for Contractors and Clients
The Off-Payroll legislation has introduced significant changes to how IR35 status is determined in the private sector. As of April 2021, medium and large companies are now responsible for assessing the IR35 status of their contractors and issuing a Status Determination Statement (SDS)[1][4].
A Status Determination Statement is a comprehensive document prepared by the end client that declares a contractor's deemed employment status following an IR35 assessment. It must provide reasons for reaching this conclusion and demonstrate that reasonable care has been taken in the assessment process[1][4].
When determining IR35 status, several key factors are considered: Personal Service / The Right of Substitution, Mutuality of Obligations (MOO), and Control. These factors are crucial in determining whether a contractor is inside or outside IR35[1][2].
Small private sector organisations, defined by the Companies Act 2006, are exempt from determining IR35 status. These organisations must meet two of the following criteria: annual turnover less than £10.2 million, balance sheet total less than £5.1 million, or less than 50 employees. In these cases, contractors are responsible for determining their own IR35 status[1][5].
The length of a contract does not automatically influence IR35 status. What matters is the nature of the relationship between the contractor and the end client. For example, if a contractor is engaged to deliver a specific project and has a genuine right to substitute, IR35 is less likely to apply. However, if the contractor is engaged to provide staff to cover for an end client's employee for a fixed term, IR35 is more likely to apply[2].
The 24-month rule, which allows workers to claim travel costs between their home and client's offices if the workplace is deemed temporary, has no direct connection to IR35 status. Contractors can work for the same client for more than 24 months without automatically being inside IR35[2].
For contractors working overseas, IR35 rules still apply if the end client has a UK presence or if the contractor is a UK tax resident. Contractors should ensure their end clients are aware of their IR35 obligations, even if they are based overseas[5].
Understanding IR35 status determination is crucial for both contractors and clients. By ensuring accurate assessments and issuing comprehensive Status Determination Statements, both parties can confidently navigate the complexities of IR35. Contractors should be proactive in discussing their IR35 status with their end clients, especially if they are working overseas. Using tools like the Kingsbridge IR35 status tool can provide a clear "Inside or Outside IR35" verdict and help protect against potential IR35 issues[5].