Search

How can we help?

Icon

Can an IR35 decision be challenged?

The IR35 private sector reforms are due to come in on 6 April 2021. If after a status determination statement (SDS), the contractor is found to be employed for tax purposes, then they will have to pay tax and national insurance contributions (NICS) as if they were an ordinary employee.

Contractors will likely not challenge an SDS where they are found to be self-employed. However, they will challenge the decision when they are found to be a deemed worker or employee as they will pay more tax and NICS.

Contactors will be aggrieved as they will taxed as an employee but not receive any of the other employee benefits such as a permanent contract. The IR35 rules requires the client to have a dispute resolution method that will allow the contractor to challenge their SDS.

What is the dispute resolution method? 

The dispute resolution method is client led. Indeed, there is no tribunal or court a contractor can bring their SDS challenge too. The IR35 rules simply require the client to have a dispute resolution method for the SDS to be challenged. Once a challenge or appeal has been received then the end user must review the SDS.

If the SDS has not changed then the client must give a written statement to the contractor confirming that they have reviewed the decision and it is correct. That statement must set out the reasons why that decision is correct.

If on review the client has incorrectly made an error on the SDS. Then the client must give a new SDS confirming there is a new conclusion from the previous SDS. That SDS must state the date from which they consider the conclusion in the new SDS became correct and when the previous SDS was withdrawn.

The client should take all SDS challenges seriously. The contractor can contact HMRC direct and ask them to be treated as self-employed. HMRC may open an IR35 enquiry and the SDS correspondence will likely be sent to HMRC.

IR35 is complex and legal advice should be taken prior to the SDS being made.  Please do get in contact with us if you would like more information on IR35.  You can give us a call on 0118 958 5321 or email us at contact@clarkslegal.com

Contactors will be aggrieved as they will taxed as an employee but not receive any of the other employee benefits such as a permanent contract. The IR35 rules requires the client to have a dispute resolution method that will allow the contractor to challenge their SDS.

Disclaimer
This information is for guidance purposes only and should not be regarded as a substitute for taking legal advice. Please refer to the full General Notices on our website.

Author profile

About this article

Read, listen and watch our latest insights

art
  • 17 February 2026
  • Employment

The Employment Rights Act – A shift in power: why employers will face greater pressure from industrial action and union relations in 2026

Substantial union-related changes under the Employment Rights Act 2025 will take effect on 18 February 2026, ushering in significant shifts in the legal landscape for industrial action in the UK.

art
  • 13 February 2026
  • Employment

Businesses Prepare for Stronger Trade Union Rights: Monica Atwal Comments

The new trade union rights introduced by the Employment Rights Act 2025 will come into force on 18 February 2026. These changes are expected to make strikes easier to organise and will extend protections for striking workers. Monica Atwal comments on the implications of these reforms in People Management magazine.

art
  • 12 February 2026
  • Employment

Clarkslegal Partners with Albion Legal to Offer Comprehensive Employment Law Protection Scheme

Employment law is becoming increasingly complex for UK employers. Legislative change, evolving case law and an expanding scope of employee rights mean that the risk of employment disputes and the cost of defending them has never been higher.

art
  • 29 January 2026
  • Employment

Why AI Generated Grievances Are Becoming a New HR Challenge

Artificial intelligence (AI) tools are becoming a routine part of working life across the UK.

art
  • 29 January 2026
  • Employment

Vexatious claims – what to do and how to stop them

It is not unheard of for employees (or former employees) to try their luck when it comes to pursuing employment tribunal claims in the hope they may be able to receive a financial award.

art
  • 18 December 2025
  • Employment

Employment Law: Looking back at 2025 and what to expect in 2026

2025 has certainly been an interesting year for employment law. While the Employment Rights Bill has pulled much of the focus since it was introduced in October 2024, there have been other important updates this year as well.