Ir35 and what it means for contractors in the public sector
IR35 legislation impacts public sector contractors by shifting tax responsibility to organizations, potentially increasing contractors' tax liabilities and altering their working conditions. Compliance and accurate status assessments are critical for all parties involved.

Understanding IR35 and Its Impact on Public Sector Contractors
The IR35 legislation has been a topic of much debate since its introduction in 2000, especially among contractors working in both the private and public sectors. Initially designed to combat tax avoidance, IR35 has undergone significant changes, particularly affecting those working within the public sector. This article aims to clarify what IR35 is, how it applies to contractors in the public sector, and what the changes mean for both contractors and organisations.
What is IR35?
IR35, also known as the "off-payroll working rules", is a set of tax regulations introduced by HMRC (Her Majesty's Revenue and Customs) to prevent individuals from avoiding tax by working as 'disguised employees'. Essentially, it targets contractors who provide their services through an intermediary, such as a personal service company (PSC), but who would be classified as employees if the intermediary did not exist.
Before IR35, many contractors were able to benefit from tax advantages by paying themselves a small salary and taking the remainder of their earnings as dividends. These dividends were subject to lower tax rates and were not liable for National Insurance contributions, creating a tax saving. However, under IR35, if HMRC determines that a contractor is working as a 'disguised employee', they must pay income tax and National Insurance contributions (NICs) as if they were an employee.
The Shift to the Public Sector in 2017
In April 2017, significant changes to IR35 were introduced for the public sector. Previously, it was the responsibility of the contractor to determine whether their engagement fell within IR35. However, with the new reforms, this responsibility shifted to the public sector organisation engaging the contractor. The changes were designed to ensure greater compliance with the legislation and to prevent tax avoidance in the public sector.
Public sector bodies, such as government departments, NHS trusts, and local authorities, became responsible for determining the employment status of contractors. If the organisation deemed that a contractor was working inside IR35, it would deduct income tax and NICs at source, as it would for an employee.
How IR35 Affects Public Sector Contractors
For contractors in the public sector, the introduction of the 2017 reforms meant a significant change in how they were taxed. If a contractor is deemed to be inside IR35, they face higher tax liabilities, as they must pay income tax and National Insurance contributions as though they were an employee. This reduces the overall take-home pay for many contractors, making contracting in the public sector less financially attractive.
However, it's not just about the financial impact. The determination of IR35 status can also affect a contractor's working conditions. For example, contractors classified as inside IR35 may find themselves subject to stricter working arrangements, such as less flexibility and control over how they complete their work, which can make the contracting experience feel more like permanent employment.
On the other hand, if a contractor is deemed to be outside IR35, they can continue to operate as they did before, paying themselves through dividends and maintaining the tax efficiencies associated with working through a personal service company.
Key Factors Determining IR35 Status
To assess whether a contractor falls inside or outside IR35, public sector bodies must consider several factors, including:
Control: Does the organisation have control over how, when, and where the contractor completes their work? If the organisation exercises significant control, the contractor is more likely to be inside IR35.
Substitution: Can the contractor provide a substitute to carry out the work? If a contractor has the right to send a substitute, it is more likely that they are operating outside IR35.
Mutuality of Obligation (MOO): Is there an obligation on the part of the contractor to accept work and on the part of the client to provide work? If there is mutual obligation, the contractor is more likely to be inside IR35.
These factors are not definitive on their own, and HMRC will typically consider the overall nature of the working relationship when making a determination.
Consequences for Public Sector Organisations
The introduction of the IR35 reforms in the public sector has also placed additional burdens on organisations. Public sector bodies now have to carefully assess the employment status of every contractor they engage, ensuring that they are compliant with IR35 regulations. Failure to do so can result in significant penalties from HMRC, as well as backdated tax liabilities.
To help with this, HMRC introduced the Check Employment Status for Tax (CEST) tool, which allows public sector organisations to determine whether a contractor falls inside or outside IR35. However, the CEST tool has been criticised for being overly simplistic and not always producing accurate results. As a result, many organisations seek legal or professional advice to ensure they are making the correct determinations.
Additionally, some public sector bodies have adopted a blanket approach, categorising all contractors as inside IR35 to avoid the risk of non-compliance. This has led to frustrations among contractors who feel that their individual circumstances are not being considered.
The Future of IR35 in the Public Sector
The IR35 reforms introduced in the public sector in 2017 were extended to the private sector in April 2021. This means that the off-payroll working rules now apply equally to contractors in both sectors, although small private companies are exempt from the rules.
As the IR35 regulations continue to evolve, it remains crucial for contractors and public sector organisations alike to stay informed about any potential changes to the legislation. Contractors should ensure they understand their IR35 status and seek professional advice if necessary, while public sector bodies must continue to assess contractors' employment status carefully to avoid the risk of non-compliance.
Conclusion
IR35 has brought about significant changes for contractors working in the public sector. With the responsibility for determining employment status now placed on public sector organisations, contractors must be aware of the factors that affect their IR35 status and how these may impact their tax liabilities and working conditions. For public sector bodies, compliance with IR35 is essential to avoid penalties, but it also requires careful consideration to ensure that contractors are assessed fairly and accurately.
Ultimately, while IR35 aims to ensure fairness in taxation, it has created complexities for contractors and organisations alike, making it more important than ever to seek expert advice and maintain clear communication between all parties involved.