When you get employed at the University of Southern Denmark while living in Germany, there are some practical issues you need to settle before starting your employment, e.g. social security, taxation, etc.
To receive your salary you need to apply for a tax card and a personal tax number using this online form. You also have to open a Danish bank account (NEM-konto) or have your foreign bank account assigned as a NEM-Konto. If you want to apply for the special tax scheme for researchers you need to fill out this form in cooperation with your department.
If you apply for the special tax scheme for researchers you need to fill out the 01.012 Supplement and the 01.012 A (Approved researcher) and send them both directly to the salary office in cooperation with your department. Read more about the special tax scheme for researchers. Read more about taxation here.
When you live in Germany and work in Denmark you are usually covered by social security in Denmark. Please use this online form to apply for a special Health Card. The special health card is your proof of your right to health care in Denmark. You will also receive a German health card marked “Status 7” that proves your right to health care in Germany as well. Read more about social security here.
If you want to be covered by unemployment insurance you have to sign up in an “A-kasse” in Denmark, but you will receive unemployment benefits from Germany if you lose your job in Denmark. Read more about the rules here.
At pendlerinfo.org and borger.dk you can find supplementary information.