Do you live in Norway and work in another Nordic country for a public sector employer?
This applies to you who live in Norway and work in another Nordic country for a public sector employer. The information only applies to tax on earned income.
Definition of "public sector employer"
You are deemed to have a public sector employer when you are employed by the central government, regional or municipal authorities or a public law institution, or an equivalent administrative authority in the other Nordic countries. State universities and university colleges in the Nordic countries except Finland are deemed to be public sector employers. The Finnish universities are deemed to be private employers. Companies owned by the state or a municipality etc. are not regarded as public sector employers. Nor will the state, municipality etc. be regarded as a public sector employer if the business in question is a commercial undertaking
See here if you have a private sector employer.
Norwegian public sector employer
If you work in another Nordic country and receive your salary from a Norwegian public sector employer, your salary will only be taxed in Norway.
Public sector employer resident in another Nordic country
If you work in another Nordic country and receive your salary from a public sector employer resident in the country in which you are working, your salary will be taxed in that country. If you perform all or part of your work in Norway, the salary for the work performed in Norway will normally only be taxed in Norway.
Taxation in Norway
Income from employment that is taxed in another Nordic country must always be declared in your Norwegian tax return. You must also complete form RF-1150 "Reduction of income tax on wages". When your tax is assessed in Norway you will be entitled to a reduction in your Norwegian tax so that you do not pay tax on your salary income in Norway.
Cross-border commuters are persons resident in Norway in a municipality bordering on Sweden or Finland who work in a border municipality on the other side of the border. If you are a cross-border commuter, your income from employment will only be taxable in Norway. It is a condition that you stay regularly in your permanent home in Norway at least two days a week (spending the night).