The online calculator is designed to show whether individuals on specific engagements should be classed as employed or self-employed for tax purposes.
Ian Anfield, managing director of Hudson Contract, said: “We have studied it from the perspective of our limited company clients and they have all emerged as compliant with IR35 legislation.
“The tool is more comprehensive than the last version, but I was left feeling the answers to some questions are not as simple as ‘yes or no’.
“Users are forced to give binary answers to open questions, which has to cause concern over the accuracy of determinations.”
The update generated much comment in the trade media titles with an interest in IR35.
IPSE told Accountancy Daily: “Until CEST more accurately reflects case law, we can expect more incorrect assessments and more tax tribunal defeats for HMRC.”
Ian Anfield of Hudson Contract said: “With HMRC standing by CEST for determining the status of workers, we advise organisations seeking clarification on IR35 to contact us for advice and assistance.”