I'm considering to change from a regular employment contract 契約社員 to an independent contractor 業務委託契約 arrangement.
Comparing working directly as an employee by a company and as an independent contractor for the same job, some costs formally on on the company now falls on me as the contractor instead. I guess health insurance and tax are examples in this category but I assume there are more.
How much more do I need to charge as a contractor compared to the salary to get the same bottom line?
(For a yearly salary figure let's say about 600万円 - 10000万円 for this example and ignore bonus, overtime etc etc in this equation for simplicity, )