Citizens of an EEA country must demonstrate that they have sufficient means to cover their living expenses in Finland. The residence permits for international students are granted only for one year at the most. Application for a new residence permit is submitted to the local police authorities. Other international students are allowed to do paid work for a maximum of twenty hours a week during the semesters and full time during the vacations. You will need a separate work permit if you intend to work more than this during the semesters.
International students can obtain a work permit at a Finnish embassy or consulate abroad.
In Finland employment authorities issue work permits for foreign nationals who reside in Finland and hold fixed-term residence permits. Applications are submitted to the police of the foreigner's place of residence. You should notice that in order to renew your residence permit your studies must progress during the academic year despite of your work. If you are coming as a full-time worker, you must obtain a work permit. For more information see the websites of The Finnish Police and The Directorate of Immigration .