Inside vs Outside IR35 | Understanding the Difference

Are you a UK contractor confused by the off-payroll working rules? And when it comes to understanding inside vs outside IR35, it becomes even more challenging, right?

The UK government introduced IR35 tax legislation to identify disguised employees. These are the contractors or workers who enjoy the tax benefits of running a limited company but operate just like regular employees.

To understand the concept, read this blog thoroughly. It explains IR35 rules for contractors, the core differences between inside vs outside IR35, and tips to keep your business compliant.

What is IR35?

The UK’s off-payroll working rules, also known as IR35, were introduced by the UK Government in the Finance Act 2000 and administered by HM Revenue and Customs (HMRC). IR35 is a tax law designed to identify disguised employees. This means it determines whether a contractor should be treated as an employee for tax purposes. Moreover, it prevents you from avoiding employee tax rates while your working relationship resembles that of an employee.

How Does IR35 Work?

Before diving into the inside vs outside IR35 differences, it is important to know how IR35 works. IR35 looks at your legal paperwork and examines the actual daily working relationship between you and the client.

If a contract falls outside IR35, you can continue to operate as a self-employed business and take advantage of the tax efficiencies associated with it. However, if a contract falls inside IR35, you must pay Income Tax and National Insurance contributions (NICs) just like an employee.

Although contractors working inside IR35 pay employee tax, they do not receive employment benefits, such as sick pay, holiday pay, or redundancy.

In the UK, the IR35 rules apply across both the public and private sectors. These rules can have a significant impact on your take-home pay and tax obligations.

Inside vs Outside IR35: The Key Differences

Now that we know the IR35 meaning and how it works, let’s understand the inside IR35 and outside IR35 meaning and what the key differences are between them.

What Does It Mean to Be Outside IR35?

Being outside IR35 means that HMRC classifies you as a genuine independent business for tax purposes rather than a disguised employee. In this situation, you operate as an independent business and have greater control over how greater control over how the work is completed. It also means you have to bear a degree of financial risk.

Additionally, your company is responsible for managing its own tax affairs, such as NI Income tax, corporation tax, and dividends (where applicable). Although you are not subject to PAYE deductions, you must ensure that both your contract and daily working practices demonstrate a genuine B2B relationship.

What Does Inside IR35 Mean?

To fully understand inside vs outside IR35, you obviously need to know what inside IR35 contracts are. Inside IR35 means that HMRC treats you as an employee for tax purposes. This means your earnings are subject to Income Tax and NICs through PAYE, just like a permanent employee.

Moreover, you cannot generally claim tax relief on travel and subsistence expenses for ordinary commuting to the client’s workplace. Basically, being inside IR35 reduced the tax benefits related to operating through a limited company.

For example, working inside IR35 means working Monday to Friday, no substitutes, fixed hours, and a manager controls work.

Look at the table below for a quick comparison between inside and outside IR35:

Outside IR35	Inside IR35
PAYE not required	PAYE required
More independent	More client control and supervision
Higher business risk	Lower business risk
Take-home pay is higher	Take-home pay is lower
No automatic employment rights	No employment rights despite employee-like taxation

What is the Financial Impact of Being Inside vs Outside IR35?

Being inside IR35 means having fewer tax benefits. When you work inside IR35, you are treated as an employee. This means that the organisation paying your limited company will deduct Income Tax and employee NICs through PAYE before making payment. As a result, your take-home pay is lower than it would be if you were working outside IR35.

Moreover, the fee-payer pays the employer’s NICs, although commercial contracts may allow this cost to be reflected in the contractor’s rate. However, on the bright side, being inside IR35 reduces administrative responsibilities because the fee-payer handles all the tax deductions.

What are the 3 Principles for IR35 Status Determination?

You need to know how HMRC tests IR35 status so you can understand the difference between inside vs outside IR35 and can decide whether you fall inside or outside IR35.

Many contractors get confused about whether their engagement falls. For clarification, HMRC has developed an online tool, Check Employment Status for Tax (CEST). Through this online employment status tool, you can find out if your engagement should be classed as self-employed or employed for tax purposes.

While HMRC’s CEST tool can help determine status, many advisers recommend reviewing contracts and working practices carefully, as complex cases may require professional advice. HMRC relies on several employment status tests, with three of the most important being:

Control

Control is a crucial test of employment. It also allows you to determine the key difference between inside vs outside IR35. HMRC looks at the level of direction, control, and supervision the client has over how, where, and when you do your work. If your client controls your workload and dictates the way it is carried out, it suggests you are inside IR35.

Substitution

The right of substitution is another principle that determines IR35 status and helps you differentiate between inside vs outside IR35. An independent contractor usually can send a qualified substitute to complete the work. However, if the client demands your personal service to carry out the work, the contract falls inside IR35.

Mutuality of Obligation (MOO)

In an employment relationship, the client is obligated to offer work, and the contractor is obligated to accept and do it. If your contract allows the client to stop providing work without paying, or allows you to terminate the project without penalty, MOO is absent.

What are the Other Factors That Affect the IR35 Status?

HMRC considers other factors as well to decide the IR35 status, such as:

• If you use your own equipment and tools
• Invoicing clients rather than receiving a salary
• Bearing financial risk, such as correcting defective work at your own expense
• Working with multiple clients

Who Decides Your IR35 Status?

The responsibility for determining your inside vs outside IR35 status remains with the client.

Public Sector and Medium/Large Private Clients

In 2017, reforms in the public sector IR35 shifted the responsibility for determining employment status from the individual contractor to the hiring public sector organisation. This means that if a contract is found to be inside IR35, the fee payer must deduct income tax and NI before issuing payment.

Since April 2021, medium and large private sector clients have been generally responsible for determining a contractor’s IR35 status. They need to assess whether the engagement falls outside or inside IR35. Also, they must provide a Status Determination Statement (SDS) explaining their reasons, decision, and dispute process. When producing SDS, clients must take reasonable care.

Furthermore, the end client must apply the correct off-payroll working rules. If they don’t, liability for unpaid tax and NI may fall on the client or the fee-payer.

Small Private Sector Clients

Small companies are defined under the Companies Act using turnover, balance sheet total and employee thresholds. If the client qualifies as a small company, the responsibility for determining IR35 status remains with the contractor’s limited company. In such a case, the contractor must assess their own status. Also, if the assessment is incorrect, they are responsible for any resulting tax liabilities.

What are the Tips for Contractors and Businesses?

The following tips can help you assess inside vs outside IR35 status:

Tips for Businesses

• Keep clear documents, as they will help you determine and prove your IR35 status.
• Before engaging contractors, conduct thorough IR35 assessments.
• Issue a clear and well-reasoned SDS.
• Ensure your working practices are aligned with the terms of contracts.
• Review contractor engagements regularly

Tips for Contractors

• Review contracts carefully
• Keep evidence of your independence, such as using your own tools and having more than one client
• Ensure any right of substitution is genuine
• Keep accurate records of invoices, communications, and project scopes that show a B2B relationship.

The Bottom Line

Understanding Inside vs Outside IR35 is essential for UK contractors to determine their employment status. Although an outside IR35 status offers business freedom and tax efficiency, it requires strict operational boundaries and meticulous contract management.

On the other hand, being inside IR35 means paying higher taxes. However, it offers a simpler compliance path with less direct financial risk from HMRC. If you are unsure about your IR35 status, you can use HMRC’s online employment status tool, CEST. You must also ensure your daily working habits match your independent business status. Always know where you stand, as it will protect your income.

Still overwhelmed and don’t know where to start? Don’t worry, we are here to help. When in doubt is best to seek professional help. But how to find the best help? At Accountingfirm, we allow you to search, compare, and choose the right accountant for your business. Enter your postcode and get a qualified accountant in the UK in no time.

Disclaimer: The information provided on AccountingFirms.co.uk is for informational purposes only and should not be considered as financial advice. Always consult with a professional accountant to ensure compliance with UK laws and regulations.