Hi,
I am sorry but we can not help you with questions related to tax. You must contact skat.dk about tax related questions.
In Denmark we do not pay a contribution only dedicated to social security. Social security expenses is covered by the generel tax which everybody who have income from salary or from self-employed business pay..
Contrary to many other EU countries we do not have compulsory Unemployment Insurance in Denmark.
If you want to be covered by Unemployment Insurance you must become member of an Unemployment Insurance Fund (“A-kasse”).
There are no speciel rules for freelancers regarding A-kasse and unemployment Insurance. If you meet the requirements you can get Unemployment benefits (“dagpenge”).
See requirements here: https://www.a-kasser.dk/requirements/
Pension is also out of the scope of our website to answer about. Everybody who have a salary pay a little amount every month to ATP. However to get a proper pension you (or your employer) must pay in to a private pension insurance Scheme.
If you have further questions about Unemployment Insurance we will be happy to help you.
Best regards,
Anders Weber, A-kasser.dk