IR35 is the common term for the Intermediaries Legislation, a tax legislation introduced to combat a form of tax avoidance whereby contractors are providing their services similarly to employees but through an intermediary, usually their personal service company (PSC). HMRC believed that many contractors were operating as ‘disguised employees’ and were incorrectly describing their employment status as ‘self-employed’. The legislation was introduced to ensure contractors working similarly to employees would pay the same income tax and National Insurance Contributions (NICs) as their permanent counterparts.
Before April 2017, contractors operating via a PSC were responsible for determining their own IR35 status and paying any employment taxes due. However, in 2017, off-payroll in the public sector was introduced, and it became the responsibility of the public sector organisation engaging the contractor to determine their employment status.
On the 6th of April 2021, the off-payroll changes were extended to the private sector. Since that date, medium and large-sized private sector clients are responsible for determining the employment status of the contracts it enters into with private sector workers. In addition, the fee-payer (the organisation paying the PSC) is responsible for making deductions for income tax and NICs and paying these to HMRC before making a net payment to the contractor for the work completed.