Inside IR35 Contract Jobs Explained
What does inside IR35 mean?
Inside IR35 means a contract engagement has been assessed and determined to resemble employment rather than genuine self-employment. HMRC considers that if the intermediary, typically a limited company, were removed from the arrangement, the contractor would effectively be an employee of the client based on the actual working practices.
The practical consequence is that the contractor is taxed at source through PAYE, just like a permanent employee. Income tax and national insurance are deducted before the contractor receives their pay. The contractor cannot use the tax-efficient salary and dividend structure available to those working outside IR35.
For medium and large private sector clients, the end client is responsible for making the IR35 determination by assessing the actual working arrangements against established case law principles. They issue a Status Determination Statement before the engagement starts. If you disagree with the determination, you have the right to challenge it through the client internal dispute resolution process, though in practice many contractors accept inside IR35 determinations rather than lose the engagement.
How does being inside IR35 impact my take-home pay?
Working inside IR35 reduces your take-home pay compared to an equivalent outside IR35 engagement at the same day rate. The difference arises because inside IR35 income is subject to full PAYE deductions, including income tax, employee national insurance, and employer national insurance, whereas outside IR35 income can be distributed through a more tax-efficient salary and dividend combination.
At a day rate of £500 per day over a full working year, the take-home difference between inside and outside IR35 is typically in the range of £7,000 to £10,000 per year, depending on individual circumstances, expenses, and pension contributions. This is why many contractors negotiate a higher day rate for inside IR35 engagements to close the gap.
Beyond the tax impact, inside IR35 contractors also lose the ability to claim most business expenses against their income. Outside IR35 contractors can offset costs such as travel, equipment, training, and professional subscriptions against corporation tax. Inside IR35, the only expenses typically claimable are those that would be allowable for a regular employee, which in most cases is limited to pension contributions.
Our IR35 guide includes a side-by-side comparison of take-home pay at various day rates, showing the exact financial impact of IR35 status.
What is an umbrella company and do I need one?
An umbrella company acts as an intermediary between you and the end client or agency. It employs you for the duration of the contract, runs payroll, deducts tax and national insurance, and pays you a net salary. In return, it charges a margin, typically between 20 and £35 per week.
If you are working inside IR35, you almost certainly need an umbrella company unless the agency offers its own PAYE option. Most end clients and agencies will not engage contractors inside IR35 directly and require you to work through a compliant umbrella arrangement.
The umbrella company handles all payroll administration, employer national insurance, apprenticeship levy, pension auto-enrolment, and holiday pay. You submit timesheets, the umbrella invoices the agency or client, and you receive a payslip showing all deductions.
Choosing a reputable umbrella company matters. The market includes compliant operators alongside schemes that promise inflated take-home pay through tax avoidance structures. If an umbrella company claims you will take home significantly more than the standard PAYE calculation suggests, it is almost certainly operating a non-compliant arrangement that could leave you liable for unpaid tax. Our umbrella company guide covers how to choose a compliant provider and what to look out for.
Should I negotiate a higher rate for inside IR35?
Yes. If you have previously worked outside IR35 and are considering an inside IR35 engagement, your target day rate should be higher to compensate for the increased tax burden. The market increasingly recognises this, and many experienced contractors build the IR35 status into their rate negotiation.
As a rough guide, an uplift of 15% to 20% on your outside IR35 rate brings your take-home closer to parity. At £500 per day outside IR35, you would aim for £575 to £600 per day inside IR35 to achieve a similar net position. The exact figure depends on your tax band, pension contributions, and whether you have other income.
Not all clients will accept this. Some have fixed rate cards, particularly in the public sector and large financial services organisations. In those cases, the decision becomes whether the engagement is worthwhile at the offered rate given the inside IR35 tax treatment. Many contractors accept a lower net position on inside IR35 work if the contract offers other advantages such as longer duration, interesting work, or a route to further engagements.
The key is to know your numbers before negotiating. Understand what your take-home will be at the offered rate after all deductions, and compare it to what you need rather than what you earned on your last outside IR35 contract.
Which sectors and roles are mostly inside IR35?
The public sector is almost entirely inside IR35 following the 2017 off-payroll reforms. Central government departments, NHS trusts, local authorities, and defence all apply inside IR35 determinations as standard for contractor engagements. The same applies to most public bodies and regulators.
Large financial services organisations, including the major banks, insurers, and asset managers, have largely moved to inside IR35 for most contractor roles. While some pockets of outside IR35 work remain for genuinely advisory or project-based engagements, the default position at most Tier 1 and Tier 2 financial institutions is inside IR35.
In terms of roles, operational and ongoing positions are more likely to be inside IR35 than project-based or advisory work. IT support, systems administration, testing, operational finance, HR, and compliance roles that involve day-to-day responsibilities within a team tend to be inside IR35 because the working patterns closely resemble employment.
Across the roles listed on Quality Contracts, approximately two thirds of contracts with a stated IR35 status sit inside IR35. This proportion is higher in public sector and financial services roles and lower in technology, consulting, and specialist advisory disciplines.
How many inside IR35 jobs are there on Quality Contracts?
Around two thirds of the roles currently listed on Quality Contracts with a stated IR35 status are classified as inside IR35. This reflects the broader UK market where the majority of contract work, particularly in the public sector and large enterprises, now falls inside IR35.
Use the IR35 filter on the search page to see inside IR35 roles in your specialism. Data reviewed up to October 2026.