If you leave Sweden in order to live abroad for at least one year, then you are to notify the Swedish Tax Agency at least one week before departure. If your departure is cancelled or postponed, notify the Swedish Tax Agency no later than the previously stated date of departure.
All family members covered by the notification are to be entered into the form. Use more forms if there is not enough space. When the notification involves children under 18 years of age, a parent or legal guardian is to sign the notification form. If both parents are legal guardians, then both are to sign the notification form. Children who have reached the age of 16 may sign the notification form themselves.
You will be removed from the population register as "emigrated" if you are going to live abroad for at least one year. If you reside both in Sweden and abroad, this may entail "double residence". Then your population registration is assessed by all circumstances taken into account.
Those sent to work abroad in the service of the Swedish government are not to be removed from the population register during such service. The same applies to their accompanying family members.
When moving to another Nordic country, you will be removed from the Swedish population register when you have been registered in the other country.
If you are going to live abroad for a shorter period than one year, and want your post sent to another address than your home address, then you must report a special postal address to the Tax Authority on the form Anmälan - Särskild postadress (Notification - Special Postal Address) SKV 7844.
Note that you are not necessarily exempt from tax in Sweden when you are removed from the population register. The information supplied in your notification form may be used to help assess any obligation to pay tax.