If you wish to visit Sweden for more than 90 days, you need to apply for residence permit for a visit or, if you have special grounds.
Visits longer than 90 days
An application for a residence permit for a visit is always sent to the Migration Agency in Sweden, where the decision is taken. Consequently, the application period is longer than for a D-visa. If the application is granted, residence permits are usually issued for between three and twelve months.
If you have special grounds that are approved, you can obtain a national visa (D-visa) for longer than 90 days, but for a year at the most. Special grounds may for instance be that you need to travel to Sweden several times during a given year to visit your own children or to do business. A national visa gives you freedom of movement throughout the Schengen area, in the same way as a residence permit.
If you are to be granted a residence permit for a visit or a national visa, the purpose of the trip must be to visit Sweden, not to settle there. You must have the means to support yourself throughout your stay, and you must possess either a return ticket or enough money for your return journey. Medical travel insurance is not compulsory, but it is advisable, since medical costs can be high.