IR35 Explained: What Umbrella Company Contractors Need to Know

What IR35 Actually Means for Umbrella Company Workers

IR35 is HMRC's off-payroll working legislation. It targets contractors who work through an intermediary but would be classed as employees if they were engaged directly. The rules are designed to stop workers from paying less tax and National Insurance by routing their income through a limited company when their working arrangements look like employment.

If you work through an umbrella company, IR35 works differently than it does for limited company contractors. The umbrella company is your employer for tax purposes. You are already on PAYE. So the question of whether you are inside or outside IR35 shifts from "how much tax do I pay" to "who determines my status and what deductions apply".

This is the gap most online guides miss. They focus on limited company contractors deciding whether to operate inside or outside IR35. But umbrella company workers face a different set of rules, deductions, and risks. Let's walk through them.

How an Umbrella Company Works Under PAYE

When you join an umbrella company, you become their employee. They process your payroll, deduct tax and National Insurance through PAYE, and pay you the net amount. Your client pays the umbrella company, not you directly.

The umbrella company takes your gross assignment rate and deducts:

• Employer's National Insurance at 13.8% above the secondary threshold (£9,100 for 2025/26)
• Apprenticeship Levy at 0.5% if your annual pay exceeds £3 million across the umbrella's entire payroll (most umbrellas pass this cost to you)
• The umbrella company's margin (typically £75 to £150 per week or a percentage of your rate)
• Employee's National Insurance at 8% on earnings between £12,570 and £50,270, then 2% above that
• Income tax via PAYE at 20%, 40%, or 45% depending on your total taxable pay
• Pension contributions if you opt into auto-enrolment

What you do not get is the ability to retain profits in a company, claim expenses against your income, or pay yourself in dividends. Every pound you earn through an umbrella company is taxed as employment income.

Does IR35 Apply to Umbrella Company Contractors?

Yes, but not in the way most contractors assume. IR35 always applies to umbrella company workers in the sense that you are already taxed as an employee. The legislation targets the intermediary between you and the client. With a limited company, that intermediary is your own company. With an umbrella company, the intermediary is the umbrella itself.

HMRC's position is that umbrella company workers are employees of the umbrella for tax purposes. You are not running your own business. You are a temporary worker supplied to a client through a payroll intermediary. This means you cannot argue that you are outside IR35 to reduce your tax bill. The umbrella company cannot pay you outside of PAYE unless you meet very narrow exceptions (typically involving your own limited company contracting with the umbrella, which defeats the purpose of using the umbrella).

In practice, this means:

• You pay income tax and employee NI on everything you earn
• Your client pays employer NI through the umbrella (or you bear the cost via a reduced net rate)
• You have no access to dividend tax rates or the £500 dividend allowance
• You cannot claim travel and subsistence expenses against your umbrella income (the rules changed in April 2016 for contractors under supervision, direction, or control)

The Supervision, Direction, and Control Test for Umbrella Workers

Since April 2016, umbrella company contractors cannot claim travel and subsistence expenses if they are under supervision, direction, or control (SDC) by the end client. This is the key IR35-related rule that directly affects umbrella workers.

If HMRC determines you are under SDC, your travel costs to and from your client's site are not tax deductible. This includes mileage, train fares, and hotel costs. You pay tax on your gross rate, not your net rate after expenses.

If you are genuinely not under SDC, you can claim travel and subsistence. But in practice, most umbrella company contractors are under some form of SDC. The client tells you what to do, where to do it, and how to do it. That triggers the restriction.

Your umbrella company should ask you to complete an SDC status determination. Be honest on this form. HMRC can and does investigate umbrella company workers. If they find you claimed expenses incorrectly, you face backdated tax, interest, and penalties.

What Happens When the Client Determines You Are Inside IR35

If you work through an umbrella company and your client is a medium or large business (the off-payroll working rules apply to them since April 2021), the client must issue a Status Determination Statement (SDS) saying whether the role is inside or outside IR35.

If the SDS says inside IR35, nothing changes for you. You are already on PAYE through the umbrella. Your payslip looks the same. The only difference is that the client pays the umbrella company a rate that includes employer NI, and the umbrella deducts it before paying you.

If the SDS says outside IR35, you are still on PAYE through the umbrella. The client pays the umbrella company your gross rate, and the umbrella processes it through payroll. You do not suddenly gain access to dividend tax rates or company profit retention. The outside IR35 determination simply means the client does not deduct employer NI from their payment to the umbrella. But the umbrella still deducts employer NI from your pay because you are their employee.

This is the critical point: IR35 status does not change your tax treatment when you work through an umbrella company. You are always taxed as an employee. The only thing that changes is whether the client bears the cost of employer NI or passes it to you via a lower net rate.

Umbrella Company vs Limited Company: The Real IR35 Comparison

If you are choosing between an umbrella company and your own limited company, IR35 is the deciding factor. Here is how the numbers stack up for a contractor earning £500 per day, 220 days per year, gross annual income of £110,000.

Limited company, outside IR35:

• Company revenue: £110,000
• Less expenses (accountancy, insurance, software): £3,000
• Director salary: £12,570 (employer NI covered by Employment Allowance if eligible)
• Corporation tax on remaining profit (£94,430): 19% on first £50,000 (£9,500), then 25% on £44,430 (£11,107.50) with marginal relief. Rough total corporation tax: £20,607.50
• Post-tax profit available as dividends: £73,822.50
• Dividend tax: first £500 at 0%, next £37,200 at 8.75% (£3,255), remaining £36,122.50 at 33.75% (£12,191.34)
• Total personal tax: £3,255 + £12,191.34 = £15,446.34
• Net personal income after all tax: £12,570 salary + £73,822.50 dividends - £15,446.34 dividend tax = £70,946.16

Umbrella company, inside IR35 (or always PAYE):

• Gross assignment rate: £110,000
• Employer NI at 13.8%: £15,180
• Apprenticeship Levy at 0.5%: £550
• Umbrella margin at £100/week: £5,200
• Taxable pay after deductions: £110,000 - £15,180 - £550 - £5,200 = £89,070
• Income tax: £12,570 at 0%, £37,700 at 20% (£7,540), £38,800 at 40% (£15,520) = £23,060
• Employee NI: £12,570 at 0%, £37,700 at 8% (£3,016), £38,800 at 2% (£776) = £3,792
• Net pay: £89,070 - £23,060 - £3,792 = £62,218

The difference is roughly £8,728 per year in favour of the limited company route. That gap narrows if you factor in accountancy fees, Companies House filing costs, and the administrative burden of running a limited company. But it is still a significant difference.

If your role is inside IR35 and you cannot operate outside it, the umbrella company becomes the simpler option. You avoid the compliance overhead of a limited company and still get a similar net outcome to operating a limited company inside IR35.

HMRC Compliance and Umbrella Company Risks

HMRC has increased its focus on umbrella companies in recent years. The government announced in the 2024 Autumn Budget that it would legislate to make recruitment agencies and end clients jointly liable for unpaid tax in the umbrella company supply chain. This is expected to take effect from April 2026.

For now, you need to be careful which umbrella company you use. Some operate tax avoidance schemes disguised as "loan arrangements" or "composite company structures". These typically promise higher take-home pay by routing your income through loans that are not taxed as earnings. HMRC challenges these aggressively. If you use one, you will eventually receive a tax bill for the full amount of undeclared income, plus interest and penalties.

Signs of a problematic umbrella company include:

• They promise 85%+ take-home pay on a standard contract
• They ask you to sign a loan agreement as part of your employment contract
• They are based offshore or use complex corporate structures
• They do not deduct PAYE and NI on your full assignment rate
• They cannot provide a clear payslip showing all deductions

If you are unsure, check if the umbrella company is a member of the Freelancer and Contractor Services Association (FCSA) or the Professional Passport scheme. These accreditation bodies audit umbrella companies for compliance.

What to Check on Your Umbrella Company Payslip

Your payslip should show:

• Your gross assignment rate for the period
• Employer NI deducted (13.8% on earnings above £9,100 annualised)
• Apprenticeship Levy if applicable
• The umbrella company's margin
• Your taxable gross pay (assignment rate minus employer deductions and margin)
• Employee NI deducted
• Income tax deducted via PAYE
• Net pay paid to your bank account

If any of these line items are missing, or if you see unusual deductions like "administration fee" or "management charge" that are not clearly explained, ask for a written breakdown. A compliant umbrella company will provide this without hesitation.

You should also receive a P60 at the end of the tax year showing your total pay and deductions. If you leave the umbrella company mid-year, you should receive a P45 within 30 days.

When You Should Use an Umbrella Company

An umbrella company makes sense if:

• Your contract is inside IR35 and you do not want the compliance burden of a limited company
• You work through multiple agencies and want a single payroll point
• You are on a short-term assignment (under 6 months) and do not want to set up a limited company
• You are a contractor returning to the UK from overseas and need immediate payroll setup
• You prefer simplicity over maximising tax efficiency

It does not make sense if your contract is genuinely outside IR35 and you are willing to run a limited company. The tax savings from the limited company route are substantial enough to justify the extra admin, provided you are comfortable with the responsibilities of being a company director.

If you are unsure which structure fits your situation, speak to an accountant who understands contractor taxation. As ICAEW qualified accountants, we see contractors in both structures every week. The right choice depends on your rate, your contract terms, your client's size, and your personal tax position.

For more detail on the limited company side, read our guide on director pay and dividends. If you are considering incorporating, our incorporation page walks through the process.

Final Thoughts on IR35 and Umbrella Companies

IR35 explained simply for umbrella company contractors: you are always inside the tax net as an employee. The IR35 determination from your client does not change your payslip. It only changes whether the client or the umbrella bears the employer NI cost.

Your real decision is not inside vs outside IR35. It is umbrella company vs limited company. That choice depends on your contract status, your appetite for admin, and your long-term earnings trajectory.

If your assignment rate is below £400 per day or your contract is short-term, the umbrella company is usually the practical choice. If you are earning £500+ per day on a rolling contract outside IR35, the limited company route saves you thousands per year.

We work with contractors across the UK, from Manchester's Northern Quarter to London's Shoreditch. If you want a proper comparison of your specific numbers, get in touch. We will run the calculations for your rate and contract terms.