Retirement and Pension

I am going to start by working as a freelancer in Belgium, mostly with international companies. I read that self-employed individuals can claim a pension in Belgium once they retire. Can anyone explain to me what the process is to be listed as a self-employed person? Also, if I end up getting a job in Belgium, do I have to submit certain documents to change the self-employed status? Finally, how do I pay taxes as a self-employed person?


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