Hi, I'm on the job post office and I know I can earn a certain amount of part-time work. I have to report this on the day of the agreement. But I want to ask if it is possible to earn in another way. I am mainly interested in earnings by selling photos / music, etc. through digital distribution. Is it possible to earn extra money without notifying yourself at the employment office? If so, up to what amount per year without a tax return? I don't even receive benefits at the workplace at the moment, but I remember that there was something in the application about me not being self-employed, so whether there could be a problem.