@Dnatjugweme ***********
Okay, this comment had me concerned, but after some research, I have the answer - I have a civil-law contract with my employer, which does not count towards the 930USD. Other earnings do not exceed 930USD, which means I don't have to register. Thank you though, I had no idea this is a thing, so I will keep that in mind if I do exceed it. I will write the cover letter with the contract attached like you and Andi recommended