
Understanding IR35 assessment can be a complex and daunting task, especially for those who are new to freelancing or running their own businesses. IR35 is a tax rule that determines whether a freelancer or contractor is considered self-employed or an employee for tax purposes.
To pass an IR35 assessment, you must demonstrate that you are in business on your own account. This means that you need to show that you have control over your work, finances, and business operations. IR35 assessors will examine your contracts, invoices, and other financial records to determine whether you are truly self-employed.
IR35 assessors will also look at the level of control you have over your work, including whether you can choose your own projects, clients, and working hours. If you have too much control over your work, it may be considered employment rather than self-employment.
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Who Does It Apply To?
If you're wondering who the IR35 rules apply to, it's actually quite straightforward. They apply to individuals providing services through an agency or employment business, which means if you're working through a recruitment agency, these rules will affect you.
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You're also considered to be under the IR35 rules if you're a client receiving services from a worker through a recruitment agency. This is because the client is responsible for making sure the correct taxes are paid.
Another group affected by the IR35 rules are agencies providing workers' services through their intermediary. This means if you're an agency hiring contractors, you'll need to consider these rules when paying their fees.
Here's a summary of the groups affected by the IR35 rules:
- Individuals providing services through an agency or employment business
- Client receiving services from a worker through a recruitment agency
- Agencies providing workers' services through their intermediary
These rules are designed to ensure that taxes are paid correctly, and it's essential to understand who they apply to in order to avoid any potential issues.
Understanding the Rules
Understanding the rules is crucial in determining your IR35 status. The off-payroll working rules were introduced in the public sector in April 2017 and in the private sector in April 2021. This means that the responsibility for assessing IR35 status shifted from contractors to end clients and fee-payers.
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To assess IR35 status, you need to consider several key factors. Some of these factors include supervision, direction, and control, substitution, and mutuality of obligation (MOO). These factors help determine how much control the client has over your work, whether you can send someone else to do your work, and whether there's an ongoing obligation for work and payment.
Here are some key factors to consider when assessing IR35 status:
- Supervision, Direction and Control: If the client dictates how, when, and where you work, you may fall inside IR35.
- Substitution: If the client insists on your personal service, you're likely inside IR35. On the other hand, having the freedom to send a substitute suggests you're outside IR35.
- Mutuality of Obligation (MOO): If there's an ongoing obligation for work and payment, you may be inside IR35.
The end client must issue a Status Determination Statement (SDS) to the contractor and the next party in the chain, outlining the decision on status and the rationale behind it. This is a crucial document in determining IR35 status.
What Is?
IR35 is a set of tax rules that determine whether a worker is an employee or not for tax purposes. Understanding these rules is crucial to avoid any potential penalties or fines.
To start, you'll need to know what HMRC guidance is available on employment status. The 'determining status' section of the employment status manual is particularly useful here.
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A Status Determination Statement (SDS) is a document produced by the end client for each engagement, outlining the decision on status and the rationale behind it. An SDS is only required where the off-payroll reforms apply.
An IR35 assessment is the process of deciding whether an engagement is ‘inside’ or ‘outside’ IR35. This determines whether a worker is an employee for tax purposes or not.
If you're providing your service to an end client through your own intermediary company, you'll need to consider several key factors when assessing IR35 status.
These factors include:
- Supervision, Direction and Control: This aspect examines how much control the client has over your work.
- Substitution: IR35 considers whether you can send someone else to do your work if you're unavailable.
- Mutuality of Obligation (MOO): This refers to whether the client is obliged to provide work and whether you're obliged to accept it.
What's So Important?
IR35 assessments are crucial because they determine whether an engagement is 'inside' or 'outside' IR35, which in turn affects the tax status of a worker. If an engagement is found to be 'inside' IR35, the worker's pay will be subject to deductions of Income Tax, National Insurance Contributions (NICs), and the apprenticeship levy.
The end client and intermediary need to know the status of the engagement to avoid non-compliance with the IR35 rules and paying the wrong amount of tax. If they don't, they risk detrimental consequences.
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The person completing the IR35 assessment, whether it's the contractor, end client, or agency, will likely interpret the questions and arrangements slightly differently, which can lead to different results. This is why it's essential to demonstrate 'reasonable care' in undertaking employment status assessments.
To ensure compliance, contractors should understand what IR35 and the off-payroll working rules are, including the concept of a Status Determination Statement (SDS). The SDS outlines the decision on status and the rationale behind it, and is required where the off-payroll reforms apply.
The off-payroll working rules require the assessment of each off-payroll worker's IR35 status, taking reasonable care in making decisions and managing compliance. This involves considering several key factors, including Supervision, Direction and Control, Substitution, and Mutuality of Obligation (MOO).
Here are the key factors to consider for IR35 status determination:
- Supervision, Direction and Control: how much control the client has over your work
- Substitution: whether you can send someone else to do your work if you're unavailable
- Mutuality of Obligation (MOO): whether the client is obliged to provide work and whether you're obliged to accept it
Employer's Guide
As an employer, understanding the IR35 assessment process is crucial to avoid potential tax liabilities and penalties. You'll need to audit your current workforce to identify individuals providing services through their own limited company, personal service company or intermediary.
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To do this, you should identify individuals who are providing services through their own limited company, personal service company or intermediary. This will help you determine if they're considered employees or contractors for tax purposes.
Establishing a process for identifying future employees is also essential. This will help you determine whether new hires are likely to be caught by IR35 and ensure you're taking the necessary steps to comply with the regulations.
You'll need to regularly review and update your process to ensure it remains effective. This may involve consulting with a tax professional or conducting regular audits of your workforce.
Choosing a Tool
Choosing a tool is crucial when it comes to determining IR35 status. HMRC's CEST tool has been controversial, failing to provide a determination in over 22% of cases.
It's also worth noting that HMRC's CEST tool doesn't test for mutuality of obligation (MOO), a key factor in IR35 assessments.
The Kingsbridge Status Tool is a reliable alternative that asks between 29 and 34 yes/no questions to get a rounded view of the worker's contract and working practices.
Benefits of Checker Tools

Using a checker tool can provide numerous benefits for contractors and freelancers. It helps determine IR35 status quickly and accurately, ensuring compliance with tax laws.
The tool provides a reliable way to check if you fall inside or outside IR35, which is essential for contractors and freelancers. This can help avoid potential legal issues and financial repercussions.
Using an IR35 assessment tool is recommended to keep an audit trail, which will act as a strong line of defence if HMRC queries the status of the engagement. This documentation can help reduce the risk of penalties and fines associated with misclassification.
Here are some key benefits of using an IR35 assessment tool:
- Accurate Status Check: The tool provides a reliable way to check if you fall inside or outside IR35.
- Compliance Assurance: Ensures you meet HMRC regulations.
- Financial Clarity: Helps you understand your tax obligations, preventing unexpected tax bills.
- Risk Mitigation: Reduces the risk of penalties and fines associated with misclassification.
Choose a Tool
There are many tools available to help you assess IR35 status, but not all of them are created equal.
HMRC's Check Employment Status For Tax (CEST) tool has proven to be controversial, failing to provide a determination in over 22% of cases.

The updated CEST tool, known as CEST 2.0, will be moving to a new platform called OCELOT, which promises additional flexibility and better explanations, but still doesn't test for mutuality of obligation (MOO).
Consider using alternative tools that do test for MOO, such as the Kingsbridge Status Tool.
This tool asks between 29 and 34 yes/no questions to get a rounded view of the worker's contract and working practices, and triggers an 'inside' or 'outside' IR35 determination with a detailed report.
The Kingsbridge Status Tool is unique in that it offers a human touch, with a manual review by in-house IR35 and off-payroll working rules experts if the engagement's status is borderline.
ESIP Tool Differences
The ESIP assessment tool has some key differences compared to other tools on the market. One major difference is that the assessment is completed by the end client, not the contractor.
This is because the end client is ultimately responsible for the outcome of the assessment, according to HMRC. The specialist completing the assessment is someone at the end client who is closest to the detail of the engagement, such as the hiring manager.

Unlike CEST, the specialist does not see the IR35 employment status result initially, instead submitting their answers for review. This ensures a more independent review of the answers.
The approver can raise questions to the specialist until they are comfortable to approve the assessment and produce a status determination statement. This process is all recorded within ESIP, providing an audit trail of how the decision is made.
HMRC ran two IR35 assessments through ESIP and CEST, and the results were different. One came out as 'undetermined' by CEST, and a 'high risk' result in ESIP, which is as expected.
Seeking Expert Advice
Sometimes professional advice is crucial to figuring out status, so it's best to seek specialist help to provide more assurance and reduce the chance of getting it wrong.
Even with a determined status, seeking specialist help can give you peace of mind and ensure you're making the right decisions.
If an IR35 assessment isn’t clear-cut, getting specialist help is a good idea to navigate the appeal process.

Contractors and fee-payers can appeal an SDS, and end clients must have an appeal process in place, responding within 45 days.
To make a strong case for disputing a determination, you should back up your argument with evidence related to key factors such as the right of substitution, MOO, and control.
The business will either agree with your appeal or provide a written rationale for upholding the determination, which you should keep on record for future reference.
Off-Payroll Working Rules
The off-payroll working rules are a crucial part of the IR35 assessment. Introduced in the public sector in April 2017 and the private sector in April 2021, these rules shifted the responsibility of assessing IR35 status from contractors to end clients and fee-payers.
The rules require clients to assess each off-payroll worker's IR35 status, taking reasonable care in making decisions and managing compliance. This assessment is a critical step in determining the taxes the worker and client need to pay.

To comply with the rules, clients must provide a Status Determination Statement to the next party in the chain and the worker. This statement outlines the decision on status and the rationale behind it.
The off-payroll working rules also include a client-led disagreement process to handle disputes. Fee-payers must deduct the appropriate tax and NICs from the contractor's fee and pay this to HMRC, along with the relevant Employers NIC and Apprenticeship Levy.
Here are the key requirements of the off-payroll working rules:
- The assessment of each off-payroll worker's IR35 status
- The provision of a Status Determination Statement
- A client-led disagreement process
- The fee-payer to deduct the appropriate tax and NICs
Note that small private sector clients are exempt from applying the rules, but they still need to assess their own status and ensure the correct tax is paid to HMRC.
CEST and Employment Status
The CEST tool is a digital test that helps determine whether you're an employee or a contractor for tax purposes. It's not a substitute for professional advice, but it can give you a good idea of where you stand.

According to the CEST tool, you're likely to be a worker if you're engaged to provide services personally, such as if you're a freelancer or consultant.
The CEST tool considers 12 factors to determine your employment status, including whether you're in business on your own account and whether you have a right to profit from your work.
If you're classified as a worker, you'll be entitled to certain employment rights, including the right to a minimum wage and paid annual leave.
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Benefits and Considerations
Understanding the benefits and considerations of an IR35 assessment is crucial for freelancers and contractors.
The main benefit of an IR35 assessment is to determine the tax status of a worker, which can significantly impact their take-home pay.
A worker is considered inside IR35 if they're considered an employee in disguise, which can result in a significant tax bill.
On the other hand, being outside IR35 can lead to a more favorable tax treatment, with the worker being able to enjoy the benefits of being self-employed.

However, it's essential to note that being outside IR35 doesn't necessarily mean a worker is completely tax-free.
The HMRC uses a series of tests to determine the tax status of a worker, including the Business Entity Tests and the Supervision, Direction or Control test.
A worker is considered to be under supervision, direction or control if they have to follow a client's instructions, which can impact their ability to work freely.
Conversely, a worker who is given the freedom to work independently and make their own decisions is more likely to be considered outside IR35.
It's also worth noting that the tax status of a worker can change over time, requiring regular IR35 assessments.
Regular assessments can help freelancers and contractors stay compliant with tax laws and avoid any potential penalties.
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Qdos and Job Ads
Qdos Contractor is a leading provider of IR35 assessments, which are essential for freelancers and contractors to determine their tax status.
Their job ads often include a disclaimer stating that the role is outside of IR35, but this doesn't necessarily mean it's a safe bet for contractors.
Qdos' expertise in IR35 assessments can help contractors navigate the complexities of tax laws and avoid costly mistakes.
Qdos Under Off-Payroll Rules

Under the off-payroll working rules, a client business hiring a personal service company must assess the contractor's IR35 status to determine the tax to be paid.
This assessment is a crucial step, as it determines how much tax should be paid based on whether the services are provided more like a business or more like a temporary employee.
The client business must pay this tax directly to HMRC by the fee-payer.
A Qdos IR35 check is used to make this assessment, helping clients determine the correct tax liability.
Qdos Check Overview
A Qdos check is an assessment of your IR35 status, which determines whether you're an employee or self-employed for tax purposes. It's a 40+ question assessment completed online via the Qdos Status Review platform.
The Qdos check is reviewed by an IR35 consultant with 23+ years of experience, not by AI or rigid checklists. This ensures an accurate result.
Your end client reviews the results and confirms their agreement, or they can disagree and the consultant will liaise with both parties to finalize the decision. A Status Determination Statement is issued to confirm the result.
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The Qdos check allows you to provide information about your business and includes free-text fields for added context and clarification. You'll also get added support and advice from the expert team via phone, email, live chat, and a dedicated support hub.
Here are the key benefits of the Qdos check:
- Ensures an accurate assessment of your IR35 status
- Provides a Status Determination Statement confirming the result
- Includes free-text fields for added context and clarification
- Offers added support and advice from the expert team
The Qdos check is a reliable way to determine your IR35 status and ensure compliance with tax laws.
Qdos Job Ads
You'll often see job ads labeled as inside or outside IR35, which is based on a "role assessment". This assessment is an indicative view of your likely status based on some factors, such as whether the client would accept a substitute worker.
The role assessment is useful for contractors because it gives an indication of how much take-home pay you'll earn, allowing you to choose whether the role suits you before applying.
Revised Heading
If you're a contractor, it's essential to understand the IR35 and off-payroll working rules. You can find HMRC guidance through its employment status manual, specifically the 'determining status' section.

The off-payroll working rules were introduced in the public sector in April 2017 and the private sector in April 2021. Prior to these dates, contractors were responsible for assessing their own status and paying the appropriate tax to HMRC.
A Status Determination Statement (SDS) is a document produced by the end client for each engagement, outlining the decision on status and the rationale behind it. An SDS is only required where the off-payroll reforms apply.
The rules require the assessment of each off-payroll worker's IR35 status, taking reasonable care in making decisions and managing compliance. This involves four key steps:
- The assessment of each off-payroll worker's IR35 status
- The provision of a Status Determination Statement to the next party in the chain and the worker
- A client-led disagreement process to handle disputes
- The fee-payer to deduct the appropriate tax and NICs from the contractor's fee and pay this to HMRC along with the relevant Employers NIC and Apprenticeship Levy
Private sector clients who are classed as small don't need to apply the rules, but they still need to assess their own status and ensure the correct tax is paid to HMRC.
A Guide for Workers
If the Chapter 8 rules apply, then you'll need to assess the engagement's status yourself, considering your contract and working reality. This involves thinking about the contract and how you actually carry out your work.

You can use a step-by-step guide to help with the assessment, which is recommended even if the Chapter 10 rules apply. The guide is available to help you determine your own status.
To start, you should understand what IR35 and the off-payroll working rules are. You can find HMRC guidance through its employment status manual, specifically the 'determining status' section.
A Status Determination Statement (SDS) is a document produced by the end client for each engagement, outlining the decision on status and the rationale behind it. An SDS is only required where the off-payroll reforms apply.
Contractors should be aware of what a Status Determination Statement is and why it's necessary in certain situations.
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Inside vs Outside: What's the Difference?
To determine if you're inside or outside IR35, you'll need to answer a few questions about your contract terms and working practices. This will help determine your status.
You'll be asked about your role, control over your work, and how you're paid. These questions are crucial in determining your IR35 status.

If your engagement is found to be 'inside' IR35, your pay will be subject to deductions of Income Tax, National Insurance Contributions (NICs), and the apprenticeship levy (if applicable). This means you'll pay more tax.
If you're 'outside' IR35, you can operate as self-employed and receive tax advantages that come with self-employment. This is a significant benefit.
Here's a simple breakdown of the key differences:
ESIP and Employment
IR35 assessment can be a complex and time-consuming process, but ESIP makes it more manageable. The IR35 rules are notoriously difficult to apply because employment status is a subjective area.
Fortunately, ESIP provides a comprehensive assessment that takes into account established case law for practitioners to work through. This helps to reduce the uncertainty and complexity associated with IR35.
The ESIP platform is user-friendly and accessible, making it easy to manage your contractor population and history. It also supports the management of your contractor population and history in a user-friendly, accessible platform.
One of the key benefits of ESIP is the quality of support it provides. As one client put it, "Excellent tool and excellent support!"
HMRC and CEST

CEST is not a foolproof solution for IR35 assessments. Only 80% of IR35 assessments run through CEST produce an 'employed' or 'self-employed' outcome.
HMRC will stand behind the logic of CEST, but not necessarily the result itself. They'll challenge the accuracy and objectivity of the answers given, which is why it's essential to take reasonable care when completing assessments.
CEST has a 20% gap of results, returning a 'cannot determine' outcome, which leaves the user in limbo. This highlights the importance of having an alternative option, such as using alternative software or seeking professional advice.
Frequently Asked Questions
How do I know if I am IR35?
IR35 status is determined by HMRC, who assess your contract and workspace to see if you're treated like a full-time employee, receiving similar benefits and rights
What are the red flags for IR35?
Red flags for IR35 include working under client supervision, receiving a large portion of your salary from the client, and having no control over your compensation. These factors may indicate a high risk of IR35 investigation
Sources
- https://www.intelligentpeople.co.uk/employer-advice/ir35-assessment/
- https://www.kingsbridge.co.uk/ir35-assessment/
- https://www.qdoscontractor.com/ir35/off-payroll-working/what-is-a-qdos-ir35-check
- https://www.grantthornton.co.uk/insights/ir35-status-assessments-esip-tool-versus-hmrcs-cest/
- https://www.goforma.com/calculators/inside-vs-outside-ir35-quick-assessment
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