Good Morning

I have an employee in the Netherlands who we are looking to move from a permanent to a contractor role.  In order to calculate the hourly rate does anyone have any experience or knowledge of which of the permanent benefits need to be incorporated? I assume annual leave will however, when it comes to the Netherlands Pension and Sick Pay I'm unsure whether these have to be baked in and to what degree. Does anyone have knowledge of Netherlands employment law, able to advise on this or able to recommend where I can gain counsel without having to reach out to a lawyer in the Netherlands?  Many thanks in advance.