Manage your whole supply chain easily with IR35 Complete™


Manage your whole supply chain easily with IR35 Complete™


Tailored support from our IR35 experts to your agency


Fast & easy IR35 assessment tool with insurable outcomes


Everything you need to comply with IR35


Seamless management of contractors throughout the supply chain

IR35 Complete™

The most powerful assessment tool on the market
  • Fair decisions – more correct ‘outside’ determinations vs CEST.
  • Cost-effective – great commercial offering for our customers.
  • Speed – fastest tool on the market, completed in minutes.
  • Decisive –  delivers definitive answers quickly with no need for manual review.
  • Branded – take hirers and workers on a branded journey .
  • Integrated – integrate our tool into your CRM.
  • Automated workflow – reduces time chasing SDSs.
  • Insurable – we can insure you against investigations and tax losses.
Get in touch with our IR35 experts to let us assess a sample of your workforce.

More than just an assessment tool

Our IR35 Complete™ solution has everything you need to mitigate the impact of IR35.



In addition to our market-leading assessment tool, our compliance experts will take care of everything to ensure you’re fully prepared:


  • All the services and support you need to prepare for IR35 reforms
  • We remove the complexity and risk to help you experience minimum disruption
  • We’ll work with you to create a tailored and detailed project plan and support you through its implementation
  • We’ll support your communications with consultants, contractors, and end hirers with webinars and Q&As.

If your contractors need to switch to Umbrella, we have significant expertise in handling large-scale migrations:


  • Quickly deliver accurate pay illustrations and explain how pay is calculated
  • Provide a smooth and positive onboarding experience for contractors joining our Umbrella
  • Provide references from agencies with regards to our large transitions/migration projects
  • Draft clear and accurate communications for workers for dissemination by your agency.

Our Solutions

We offer a range of payment solutions to suit all circumstances

Your IR35 Project Plan

It’s important to ensure you are properly prepared for IR35 reforms. Our IR35 experts are here to help every step of the way.

Click on each phase to find out more.

Phase 1


Phase 2


Phase 3

Ongoing Support

Your experienced team

We have a team of specialists who are on hand to help your agency prepare.

Any technical or compliance-related questions can be answered by Chris James, Director of Accountancy Services and Chairman of the FCSA. While any queries you may have about the assessment tool and how it works can be answered by Del Williams, our Sales Director.

“The JSA team were highly knowledgeable, […] they were also great at communicating the complexity of IR35 and helping us to understand how the legislation relates to our business” – Crystal Metcalfe (Vice President)


Professional and efficient

Having worked with a number of umbrella companies over the years, Vicky Traynor and the team JSA stand out from the crowd due to the professional and efficient service that they provide to agencies and contractors.

Matt Randall

Fantastic team

I have been working with JSA for a while now more specifically with Maria Constantinou and their services are really amazing. The team is fantastic but I would like to say a big thank you to Maria for going the extra mile and assisting

Ernesto Gomes


Supporting Your Agency Through IR35

Click the link below to view a series of informative videos by Del Williams, Sales Director, on IR35 reforms and the practical steps you should be taking to prepare your agency. In this series, Del answers questions such as ‘How can you prove that all contractors have been properly paid?’ and ‘How can you use IR35 as an opportunity to grow your agency?’

Download Our Guide

If you are a recruitment agency and would like to know more about how you could be affected by the upcoming off-payroll (IR35) reforms, please download our comprehensive guide, outlining where you’re liable and how we can help.

IR35 assessment and liability for tax

In this short video, we help you make sense of responsibility for IR35 assessment and liability for unpaid tax.

What makes a good IR35 assessment?

In this short video we explain what makes a good IR35 assessment.

Begin Our IR35 Assessment Masterclasses

IR35 assessments and Status Determination Statements are integral parts of the new IR35 (off-payroll) reforms. To learn everything you need to know about IR35 assessments, download our free masterclasses.


We'd love to hear from you

Call us on 01923 257 257 or Request a callback