
IR35 status determinations explained
How a status determination statement is reached, who is responsible for issuing one, and what to do when you disagree with it

Where the PEO model sits against IR35, and how employment, payroll and compliance duties are divided under it.
Under a Professional Employer Organisation model the worker is genuinely employed, and the employment costs are met by the hirer rather than deducted from the worker’s assignment rate.
That single difference is what separates it from an umbrella arrangement, and it is the reason a PEO payslip reads more like a conventional employment payslip.
The PEO holds the employment contract and owns payroll, filings, pension enrolment and the statutory insurances. The hirer keeps day-to-day direction of the work and the commercial relationship.
The division should be written down. Most disputes in this model come from an unstated assumption about who owns a duty, not from the duty itself.
It suits hirers who want the compliance question closed rather than managed, and workers who want employment rights without giving up contract work.
The questions hiring firms and contractors ask most often about this subject.
It is a small, transparent fee deducted only from processed assignment income to cover employment, insurance and payroll.
You are employed by Promultis under our umbrella employment, while the agency remains your point of contact for assignments.
Standard deductions include income tax, National Insurance and any agreed pension contributions, all itemised clearly on your payslip.

Craig Moss
leads an exciting management role at Promultis
Craig Moss is a seasoned professional in the employment and recruitment industries, based in Kings Langley, UK. With over 30 years of experience, including a successful tenure as a central London realtor handling properties up to £3 million, he now leads an exciting management role at Promultis. Specialising in compliant payroll solutions for contract recruitment, Craig helps clients increase margins by up to 30% while navigating complex legislation. His people-focused approach, honed through decades in sales and people management, ensures both recruiters and workers benefit from tax-efficient, compliant solutions. Passionate about building strong relationships, Craig thrives on delivering results that drive business success.

How a status determination statement is reached, who is responsible for issuing one, and what to do when you disagree with it

Reading an umbrella payslip line by line — assignment rate, employment costs, and the taxable pay you actually take home

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