Although the changes to the application of IR35 have been in place in the public sector since April 2017, the consultation on bringing these changes into the private sector has detailed some new processes that will also apply to you as a public sector user of contract staff from April 2020.
What’s staying the same?
You will still need to make an in or out determination for each new role and take “reasonable care” when making it.
You still need to supply a list of reasons in writing for the determination to the agencies you work with.
You still have 31 days to comply with an agency’s request for these two things and if you fail to do so, you will be liable for any unpaid tax or NICs.