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 book a demonstration.

More than just an assessment tool

Our IR35 Complete™ solution has everything you need to comply with IR35.



In addition to our market-leading assessment tool, our compliance experts will take care of everything you need:


  • All the services and support you need to manage IR35 compliantly
  • We remove the complexity and risk with our in-house assessment tool
  • We’ll support your communications with consultants, contractors, and end hirers with webinars and Q&As.

If your contractors need to switch to Umbrella at any time, 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 experienced team

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

Any technical or compliance-related questions can be answered by Chris James, Director of Accountancy Services and former 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.


Proactive and Efficient

We couldn’t have asked for better support. JSA did not hesitate to give us their time and expert input, both proactively and reactively. Not only were the JSA team highly knowledgeable, but they were also great at communicating the complexity of IR35 and helping us to understand how the legislation relates to our business and our specific circumstances. It makes a big difference on a project like this, to work with people you respect, but who are also very likeable and generous with their time and knowledge.

Crystal Metcalfe

Vice President at RGP

Seamless service

We have been partnered with JSA for 2 years and have never been disappointed with the quality of their service. Del and his team are always on hand to help us. They have been especially great with IR35 coming up. As you can imagine, this could have caused unprecedented strain on our business without the help of JSA’s experts and the IR35 Complete platform. IR35 Complete has been seamless and easy to use from set up through to day-to-day use. A highly efficient platform that processes our IR35 assessments and helps us keep on top of our compliance responsibilities.

James Fernandes

Managing Director at Carrington West


Download Our Guide

If you are a recruitment agency, 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.


What Are My Options Post-IR35?

What Are My Options Post-IR35?

IR35 reforms don’t mean you have to stop contracting. There are plenty of working options available to you post-IR35 including our IR35 Switch solution.

read more

We'd love to hear from you

Call us on 01923 257 257 or Request a callback