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April 2020 change to IR35 tax Rules

19 September 2019

New and significant taxation rules will replace IR35 in the private sector from April 2020. The new off-payroll working rules will move the requirement to assess the individual’s employment status from the Personal Service Company (PSC) to their end client in the labour supply chain.

A Personal Service company (PSC) is a company owned by a person who is generally the only employee/worker of the company itself.

From April 2020, large businesses will be required to check the employment status of anyone working for them indirectly through a personal limited company using an online test known as CEST. Many companies using PSCs will find that they have to tax the PSCs as employees and pay PSC fees after deduction of PAYE and national insurance.

If the same individual has been providing services under the same contract conditions in previous tax years, HMRC could use Discovery Assessment Rules to claim tax for previous years.

Such ‘back taxes’   may be avoided if a PSC worker who has worked out that they will be within off-payroll working from next year and that this would have applied to their current year contracts make a disclosure to this effect to HMRC without being prompted to do so by HMRC. 

The table below sets out when the changes to the IR35 Rules come into effect for different types of end users   


End client

Who assesses the worker’s employment status

Who deducts PAYE/NICs

When from

Off-payrolling: public sector

Public sector

End client

Fee payer

6 April 2017

Off-payrolling: private sector

Large or medium sized private sector

End client

Fee payer

6 April 2020

IR35: private sector

Large or medium sized private sector



Until 5 April 2020

IR35: small private sector

Small sized private sector


















ECA members with queries about the above changes are advised to seek guidance from Liz Bridge (phone: 020 8874 4335 email:

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