Work in Sweden for 12 months or more
If you are moving to Sweden from abroad and are planning to live in Sweden for at least 12 months, you are considered as resident in Sweden for tax purposes, and are liable for taxation in Sweden on all of your worldwide income. You must also file a Swedish income tax return. You are required to be registered in the Swedish Population Register. When you have been registered you will be given a Swedish personal identity number and be registered as living in a building with an address. Your civil status and any relationship to your spouse, children or parent will be registered.
More information is available on the Swedish Tax Agency’s website (Skatteverket): Moving to Sweden
Income tax return
If you have been working in Sweden during the whole year or part of the previous year, you must file a Swedish income tax return. The income tax return is sent by the Swedish Tax Agency in April, to all those obliged to submit a tax return. Your tax return must be filed no later than 2 May of the year after the fiscal year.
More information is available on the Swedish Tax Agency’s website: Declaring taxes - for individuals