IR35: What Freelancers and Contractors Need to Know
- Ideal Accountancy
- Sep 18
- 4 min read

The IR35 legislation has been a subject of controversy and confusion for contractors and businesses alike since its introduction in 2000. Initially designed to tackle tax avoidance by people working through intermediaries (like personal service companies), it aimed to ensure that workers who were effectively employees but operated through a business structure still paid the appropriate income tax and National Insurance contributions (NICs). Over the years, the rules have evolved, with the latest changes in 2021 sparking renewed discussions and raising concerns among contractors.
In this blog, we'll explore the IR35 rules, the most recent updates, and what these changes mean for freelancers, contractors, and businesses in the UK.
What is IR35?
IR35, or "off-payroll working," is a tax legislation that aims to determine whether a contractor or freelancer is working as a true independent contractor or if they are actually working as an employee, disguised as a contractor, in order to avoid paying income tax and National Insurance.
The main issue revolves around whether the contractor should be classed as "inside IR35" (meaning they are essentially employees for tax purposes) or "outside IR35" (meaning they are genuinely self-employed). If the contractor is deemed inside IR35, they are required to pay the same taxes as an employee, including income tax and employee NICs.
The 2021 Update: Shifting Responsibility to the Client
Prior to April 2021, it was the responsibility of contractors themselves to determine whether their working arrangements fell inside or outside of IR35. However, changes introduced in April 2021 shifted the responsibility for determining IR35 status to the client (i.e., the organization hiring the contractor).
Key Changes in April 2021:
End-Client Responsibility:
For private-sector companies with 50 or more employees, the responsibility to assess whether a contractor falls inside or outside IR35 has shifted from the contractor to the client.
Clients must now conduct a Status Determination Statement (SDS) for each contractor they hire. The SDS must be provided to the contractor, and if the contractor disagrees with the determination, they must be given an avenue for dispute resolution.
Agencies and Third Parties:
If an agency or third-party intermediary is involved, they will be responsible for deducting the relevant taxes (income tax and NICs) if the contractor is deemed inside IR35.
The new rules now require clients to ensure that the intermediary (e.g., an agency) is compliant with these new regulations.
Small Business Exemption:
Small businesses (defined as having fewer than 50 employees, a turnover of less than £10.2 million, and a balance sheet total of less than £5.1 million) are exempt from the changes. For these companies, contractors will still be responsible for their own IR35 status determination.
Changes in Enforcement:
HMRC has emphasized that they will be taking a more active role in enforcement, and contractors found to be inside IR35 but not paying the appropriate taxes could face significant penalties.
The Importance of IR35 Status Determination
The IR35 status is critical for contractors because it directly impacts their take-home pay. If a contractor is deemed to be inside IR35, they will lose the ability to claim certain expenses (e.g., travel costs, equipment, and training) and will face higher tax rates. If they are outside IR35, they can claim these expenses and will pay less in tax.
For businesses, the risk of incorrectly classifying a contractor as outside IR35 when they should be inside can lead to substantial fines and back taxes. That’s why it's essential that clients take their responsibilities seriously when determining IR35 status.
Common Misunderstandings and Controversies
Despite the new updates, confusion still surrounds IR35, and some common misunderstandings persist.
"I work through an umbrella company, so IR35 doesn't apply to me":
This is a common myth. If you're working through an umbrella company but still operating as a contractor, IR35 still applies to your working arrangements. However, umbrella companies handle the tax and NICs for you, so you don’t need to worry about the direct impact.
"If I have a contract, I'm safe":
The written contract isn’t the only factor in determining IR35 status. HMRC will look at the actual working practices between the contractor and the client. Even if the contract states that the contractor is self-employed, the day-to-day reality of the relationship may dictate a different status.
"The client says I’m inside IR35, so I can’t dispute it":
Contractors have the right to challenge the client’s determination. The client is required to have a dispute resolution process in place. If a contractor disagrees with the SDS, they should raise it formally with the client or intermediary.
What Contractors and Businesses Can Do Now
With the 2021 changes to the IR35 rules, both contractors and businesses need to take proactive steps to ensure compliance and mitigate risks.
For Contractors:
Review your working arrangements: Even if you’ve been outside IR35 for years, changes in your working practices (e.g., working exclusively for one client, under the direction of that client) could push you inside IR35.
Seek professional advice: It may be beneficial to work with a tax advisor or employment law expert to help clarify your IR35 status and ensure compliance.
Dispute unfair determinations: If you feel that you’ve been wrongly classified, ensure that you raise the issue with your client and explore the dispute resolution process.
For Businesses:
Conduct IR35 assessments for all contractors: Ensure that a Status Determination Statement is created for each contractor, and review working practices to ensure that these assessments are accurate.
Provide dispute resolution mechanisms: Make sure that your dispute resolution process is clear and accessible for contractors who wish to challenge their status.
Document everything: Maintain clear records of why a contractor has been classified inside or outside IR35 to protect your business in case of an audit or dispute.
The Future of IR35
As of now, HMRC continues to focus on compliance, with the risk of hefty penalties for businesses and contractors who misclassify their status. There are also ongoing discussions around further reforms, including the possibility of extending the changes to smaller businesses. For contractors, the future of IR35 remains uncertain, but one thing is clear: vigilance and accurate assessments are more important than ever.
References:
HMRC Official Guidance on IR35 – HMRC
Contractor UK - IR35 – Contractor UK
UK Government’s Consultation on Off-Payroll Working (2019) – Gov.uk
Understanding the nuances of IR35 is essential to navigate the modern contracting landscape. Whether you're a freelancer, contractor, or business hiring one, staying updated with the latest IR35 changes will ensure you’re compliant and financially protected.
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