Starting a new business? Get 40% off our accountancy services for 3 months! 😎


IR35 and off-payroll working rules can be confusing, but it’s important that contractors and their clients understand the processes and rules in order to avoid any nasty penalties.

What are the IR35 rules?

Who decides whether IR35 rules apply or not?

What happens if a contract is inside IR35?

Can contractors still operate through a limited company?

IR35 legislation deals with contractors who would otherwise be employees if they weren’t working through an ‘intermediary’. The intermediary could be the contractor’s own limited company, or a partnership. If a contractor is essentially working as an employee in all but name, then the contract is ‘within IR35’.

That means that the IR35 rules apply, and the end client must deduct income tax and National Insurance Contributions for the contractor just like they would as a regular employer.

Jargon buster: What is a personal service company?

The phrase ‘personal service company’ describes limited companies set up purely to act as an intermediary, because they exist for the contractor to provide services to clients.

How would it work without IR35?

It’s a bit confusing, so we’ll give you an example. Imagine you work for an employer, and then leave to set up your own limited company.

You continue performing the same function for your former employer (basically doing the same job), except now you work through your own business, rather than being on their payroll. Without IR35:

The off-payroll working rules deal with whose responsibility it is to check if IR35 rules apply in a particular situation, also known as ‘determining someone’s employment status for IR35’.

These rules mean that the end client is responsible for checking whether a contract is within IR35, but only if the end client is a public authority or a private company which meets two or more of these conditions:

When do the off-payroll rules apply?

Issuing a Status Determination Statement (SDS)

If the client meets the criteria, it’s up to them to determine the worker’s status. They’ll issue a Status Determination Statement (SDS) which indicates why the engagement is within (or outside) IR35. The SDS is given to the worker, as well as to any person or organisation the client contracts with.

What if the client doesn’t fit those criteria?

If the client doesn’t meet the off-payroll criteria (so they’re a small, private company, or they’re based abroad with no UK connection) then it’s the intermediary’s responsibility to decide whether or not the contract falls within IR35 rules.

If CEST is used to determine the employment status of an engagement, HMRC will honour the outcome as long as the correct information has been entered. Keep the evidence!

Contractor accountancy services

From only £24.50 per month

Learn more

If the end client finds that the worker would be treated as an employee if the intermediary didn’t exist, the contract is ‘inside IR35’.

Where a contract is inside IR35, the entity that pays the intermediary will deduct income tax and employee National Insurance Contributions (NICs) from their payments. They’ll pay these to HMRC on behalf of the worker (like they do for employees), as well as making Class 1 employer’s NICs.

In some circumstances the client still pays the gross amount (so they don’t deduct tax or NI), and the intermediary’s payroll makes the deductions instead, with the worker themselves then paid as if they’re employed.

There’s no rule to say that you must close your limited company if you’re a contractor, but if your contract does fall within IR35, your client will deduct tax and NI at source.

Instead, you might decide to:

Is it better for me to be employed by my client instead?

Becoming an employee may be good for contractors already treated as inside IR35 when working for a client, but it’s not for everyone.

If the contractor does decide to become an employee, IR35 will no longer be an issue, with income taxes and NICs deducted by the employer at source. Employees also have additional employment rights, including:

The flipside of this is the loss of flexibility, non-competition clauses in employment contracts, and that some businesses may simply prefer not to be an employer.

What about an Umbrella Company?

An Umbrella Company acts as the contractor’s employer on behalf of an employment agency, operating PAYE and making the appropriate deductions.

They can also offer full employment rights and benefits, and the contractor will pay the umbrella a fee for its services. However, not all umbrella companies are compliant, and as a result some companies won’t work with them.

Becoming a sole trader instead

If the sort of work you do will usually be considered to fall within IR35, it might be more tax efficient for you to operate as a sole trader, instead. This is because sole traders aren’t legally separate from their business in the way that a director is with their limited company.

Read our article which explains the difference between sole traders and limited companies in more detail.

As a result, it means they pay tax and NI on all their profits, rather than on the money they pay themselves from the business. This means the loophole which IR35 closes isn’t available to sole traders anyway, so they aren’t subject to IR35 rules. It might mean that operating as a sole trader is more tax efficient than contracting through your own limited company if your work falls within IR35.

Find out more about our online accounting services for contractors, and get an instant online quote.

About The Author

Dean Salmon

I'm an AAT and ACA qualified Chartered Accountant with over 13 years experience working with businesses, contractors and sole traders. I also love watching live music, and quizzes! Learn more about Dean.

More posts by this author
Notify of
Inline Feedbacks
View all comments

Read more posts...

What is a Non-Established Taxable Person for VAT?

There are special VAT rules in place for online sellers who are classed as non-established taxable persons (NETPs), and use an online…

Read More

The Accountancy Partnership – Our Positive Reviews

Here at The Accountancy Partnership, we’re proud of our customer reviews The reviews we receive from our customers show how hard we…

Read More

What Type of Legal Structure Should I Choose When I Start a Business?

The structure that you choose when you start a business affects how the business operates, the amount of tax you pay, how…

Read More
Back to Blog...

Confirm Transactions

The number of monthly transactions you have entered based on your turnover seem high. A transaction is one bookkeeping entry such as a sale, purchase, payment or receipt. Are you sure this is correct?

Yes, submit my quote
No, let me change it

Please contact our sales team if you’re unsure

VAT Returns

It is unlikely you will need this service, unless you are voluntarily registered for VAT.

Are you sure this is correct?

Yes, the business is VAT registered
No, let me change it

Call us on 020 3355 4047 if you’re not sure.


You will receive our bookkeeping software Pandle for free, as part of your package.

You can use this to complete your own bookkeeping, or we can provide a quote to complete your bookkeeping for you.

Please select and option below:

I will do my own bookkeeping
I want you to do my bookkeeping

Call us on 020 3355 4047 if you’re not sure.