If you run a recruitment agency in the UK, the off-payroll working rules (commonly called IR35) are probably the single biggest compliance risk you face. HMRC has been targeting recruitment agencies specifically for several years now, and the rules have only got tighter since the reforms were extended to the private sector in April 2021.
This is not about whether your contractors like being inside or outside IR35. It is about whether you, as the recruitment agency, have followed the correct legal process for determining their status. Get that wrong, and you could be liable for unpaid tax, National Insurance, and penalties going back years.
Let me walk through exactly what the off-payroll working rules mean for your recruitment agency, and give you a practical compliance checklist you can use today.
What Are the Off-Payroll Working Rules?
The off-payroll working rules are designed to identify workers who would be employees if they were engaged directly, but who currently work through an intermediary (typically their own limited company). HMRC calls these "deemed employees." The rules shift the responsibility for determining employment status from the worker to the organisation that receives their services.
For recruitment agencies, this matters because you are often the "fee-payer", the entity that pays the contractor's limited company. That makes you responsible for operating PAYE and National Insurance on the deemed employment income if the contractor is found to be inside IR35.
The rules apply where:
- The worker provides services through an intermediary (usually their own limited company)
- The client is a medium or large organisation (the vast majority of businesses you work with)
- The worker would be an employee of the client if engaged directly
If all three conditions are met, the client must issue a Status Determination Statement (SDS) before the engagement starts. The recruitment agency then becomes responsible for operating payroll taxes on the fees paid to the contractor's company.
Why Recruitment Agencies Are the Prime Target
HMRC knows that recruitment agencies sit in the middle of the chain. You take the fee from the client, deduct your margin, and pay the contractor's limited company. If the contractor is inside IR35, HMRC expects tax and NI to be deducted at source, just like a normal employee.
The problem is that many recruitment agencies have historically treated all contractors as outside IR35, relying on blanket determinations or simply not asking the right questions. HMRC has been issuing "nudge letters" to recruitment agencies since 2022, and we are now seeing full compliance reviews and tax bills running into six figures.
Working exclusively with agency founders, we have seen cases where a recruitment agency with 30 contractors on its books received a retrospective bill for £340,000 in unpaid tax and penalties. That is the kind of liability that can put an agency out of business.
Your Responsibilities as a Recruitment Agency
Under the off-payroll working rules, the recruitment agency's responsibilities depend on where you sit in the contractual chain. In most cases, you are the fee-payer. That means:
- Receiving the SDS: The client must give you a Status Determination Statement before the contractor starts work. You must pass this on to the contractor.
- Operating PAYE: If the SDS says the contractor is inside IR35, you must deduct income tax and employee NI from the payments you make to the contractor's limited company. You also pay employer NI at 15%.
- Reporting to HMRC: You report these deductions through your regular RTI (Real Time Information) submissions, just like you do for permanent employees.
- Appealing the SDS: If the client's SDS says the contractor is outside IR35 but you disagree, you can challenge it. However, you must have reasonable grounds for doing so.
If you are a smaller agency acting as an employment business, you may also have responsibilities under the Conduct of Employment Agencies and Employment Businesses Regulations 2003. Those are separate from IR35, but they add another layer of compliance.
What Happens If the Client Gets It Wrong?
This is where it gets complicated. If the client issues an SDS saying the contractor is outside IR35, but HMRC later determines that the contractor was actually inside the rules, the liability for unpaid tax usually falls on the fee-payer, which is you, the recruitment agency.
There is a due diligence defence available, but it is narrow. You must be able to show that you took reasonable care when reviewing the client's SDS, and that you had no reason to believe the determination was wrong. In practice, that means you need to understand the client's working practices, not just accept their word.
The SDS: What You Need to See
A valid Status Determination Statement must include:
- The client's name and address
- The worker's name and the intermediary's details
- A clear statement of whether the worker is inside or outside IR35
- The reasons for that determination (not just a tick box)
- The date the determination was made
- The client's signature (or electronic equivalent)
If the client sends you a one-line email saying "John is outside IR35," that is not a valid SDS. You should push back and ask for a proper determination. HMRC will not accept a flimsy document if they come knocking.
Practical Compliance Checklist for Recruitment Agencies
Here is a checklist you can use today. Work through it with your compliance team or your accountant.