Detta gäller för Sverige...
An EU/EEA citizen who is an employee, self-em*ployed person, a provider or recipient of services, a student or a person who has sufficient funds to support himself/herself, has a right to reside in Sweden. The term right to reside means that an EU/EEA citizen and his or her family members are permitted to stay in Sweden for more than three months wit*hout a residence permit. A person who has a right of residence must register with the Migration Board no later than three months after entering the country. If you are an EU/EEA citizen and are working in Sweden but live in another EU/EEA country to which you return at least once a week, you do not need to register in Sweden.