I have a question that I’m hoping someone will be able to help with. I plan on moving with my Finnish partner next year to Finland. I should have permanent residency upon arrival. I will already also have a full time position in Finland that will not be associated with my freelancing. However, I am hoping to do work as a freelancer as well. Specifically, I would like to continue bug bounty hunting. How does taxation work? I’m aware that I will have to pay taxes on any income made but my partner is concerned that I may have to pay social security regardless whether I earn additional income or not.

So for example, if I make 10,000 euro over the course of the year doing freelance work, that will be added as a second job but on the same tax card right? And therefore my taxes will increase based on my overall income. Is this correct? And I also assume I would be required to pay social security on the secondary income.

As a second example, if I make 0 euro over the course of the year, I understand that I would need to still declare the zero on my taxes, but would I be responsible for any additional taxes despite no additional income? Would some baseline threshold social security still apply?

Sorry for the likely stupid question, but I want to understand what to expect and not get any surprises during tax season.

Thanks to anyone who is able to help!