Yes, all stuff that the country's budget needs from you, you pay them manually each 1-3 months... or else.
That's more or less how it's best described. Once you are not an employee you need an accountant, or you need to be very well versed in the laws and the monthly payments to the country's budget yourself. If neither, some 6-12 months later you get persecuted and called in court, with the possibility to have some of your property confiscated.
Once you are not under them you are completely on your own, at least here in Eastern Europe.