Here is some more information (in German): https://www.nebenjob.de/ratgeber/2479-ihr-recht-auf-den-zweitjob-bzw-nebenjob https://www.nebenjob.de/ratgeber/2479-i

Here is some more information (in German): https://www.nebenjob.de/ratgeber/2479-ihr-recht-auf-den-zweitjob-bzw-nebenjob https://www.nebenjob.de/ratgeber/2479-ihr-recht-auf-den-zwei... If your second job leads to the total of your work taking up more than 48 hours per week, your employer can forbid it. Likewise if you work in your holidays. I don't think it is as straightforward as you make it sound.