Many people assume that their Norwegian tax liability begins on the day they register their address with the National Population Register or receive a Norwegian national identity number or D-number. This is not the case. Under Norwegian tax law, it is the duration of an individual's physical presence in Norway—not administrative registration—that determines when they become tax resident.
This article explains the rules governing tax residence upon moving to Norway, which days count towards the residence thresholds, and the tax consequences of becoming tax resident.
What does it mean to be tax resident in Norway?
As a general rule, an individual who is tax resident in Norway is subject to Norwegian tax on their worldwide income and wealth, regardless of whether the income is earned in Norway or abroad and regardless of where their assets are located. This is known as the principle of worldwide taxation.
Consequently, foreign employment income, bank deposits, shares, rental income, and other income and assets located anywhere in the world must generally be reported in the Norwegian tax return.
When do you become tax resident?
The Norwegian Tax Act provides two alternative residence tests.
You become tax resident in Norway if you are physically present in the country for:
- more than 183 days during any twelve-month period; or
- more than 270 days during any thirty-six-month period.
It is sufficient for either threshold to be exceeded.
The 183-day rule
The 183-day rule is the residence test most commonly encountered in practice.
If an individual is present in Norway for more than 183 days during any rolling twelve-month period, they become tax resident in Norway.
It is important to note that the twelve-month period does not correspond to the calendar year. Instead, it is calculated on a rolling basis.
Accordingly, a person who arrives in Norway in September may become tax resident during the following year if their presence exceeds 183 days within any consecutive twelve-month period.
The 270-day rule
Even where an individual's annual presence in Norway remains below 183 days, tax residence may still arise. If you spend more than 270 days in Norway during any consecutive thirty-six-month period, you also become tax resident.
This rule commonly affects individuals who work periodically in Norway over several years without spending long continuous periods in the country.
When does tax liability begin?
The date on which tax liability commences depends on how the individual's stay in Norway develops.
If the 183-day threshold is exceeded during the first income year
If you spend more than 183 days in Norway during the first calendar year after your arrival, you are regarded as tax resident from your very first day of presence in Norway.
In other words, tax residence applies retrospectively from the date you first entered the country.
If the stay extends across more than one calendar year
If your stay begins late in the year and the 183-day threshold is not exceeded until the following calendar year, you become tax resident from 1 January of the year in which the threshold is exceeded.
The same principle applies when tax residence is established under the 270-day rule.
Which days count?
As a general rule, every calendar day—or part of a calendar day—during which an individual is physically present in Norway counts towards the residence thresholds.
It generally makes no difference whether the stay is for:
- work;
- holidays;
- family visits;
- training courses;
- medical treatment or illness; or
- other personal reasons.
The decisive factor is the individual's actual physical presence in Norway.
Registration does not determine tax residence
Registration as resident in the Norwegian National Population Register does not determine whether an individual is tax resident. The same applies to citizenship.
A foreign national may therefore be tax resident in Norway, while a Norwegian citizen may be tax resident in another country.
Tax residence is determined exclusively under the Norwegian Tax Act and must be assessed independently of the rules governing population registration.
What if you are also tax resident in another country?
It is not uncommon for an individual to be regarded as tax resident in two countries simultaneously under each country's domestic legislation.
Where Norway has concluded a tax treaty with the other country, the question of residence must be resolved under the treaty's residence provisions—the so-called tie-breaker rules.
These typically consider:
- where the individual has a permanent home;
- where their personal and economic relations are closest (their centre of vital interests);
- where they habitually reside; and
- nationality, if the preceding criteria do not produce a clear result.
Accordingly, a tax treaty may determine that an individual is treated as tax resident in another country for treaty purposes, even though they are regarded as tax resident in Norway under Norwegian domestic law.
Example
Maria moves from Germany to Norway on 1 September to take up employment. She remains in Norway for the rest of the year and continues working there the following year.
In April, she exceeds 183 days of presence in Norway during the preceding twelve-month period.
Because the threshold is exceeded during the second calendar year, Maria becomes tax resident in Norway from 1 January of that year. From that date, she is generally subject to Norwegian tax on her worldwide income and wealth, subject to any limitations imposed by the tax treaty between Norway and Germany.
Conclusion
The rules governing tax residence upon moving to Norway are based on objective presence tests. If you spend more than 183 days in Norway during any twelve-month period, or more than 270 days during any thirty-six-month period, you become tax resident in Norway.
Once tax residence arises, you are generally subject to Norwegian tax on your worldwide income and wealth, meaning that foreign income and assets fall within the scope of Norwegian taxation. At the same time, an applicable tax treaty may limit Norway's taxing rights if you are also regarded as tax resident in another country.
For individuals planning to work or establish themselves in Norway, it is therefore advisable to assess the tax consequences before relocating. Careful planning can help avoid unexpected tax obligations and ensure that cross-border tax issues are managed correctly from the outset.
