If you have a valid residence permit as a skilled worker with an employer in Norway, you do not need to report to the UDI or the police if you are fully or partially laid off. We do not revoke the residence permit based on being laid off.
You can stay in Norway as long as your residence permit is valid.
If you were laid off before 31 October 2020
If you were laid off in the period 12 March 2020 to 31 October and later want to apply for permanent residence, the time you were laid off will not count in your period of residence when you apply for a permanent residence permit. However, being laid off in this period will not break the period of continuous residence. This means that if, for example, you are laid off for three months in the period mentioned above, then you must have a total of three years and three months with permits that form the basis for permanent residence before you meet the requirements.
If you have been or are laid off after 31 October 2020
If you have been laid off as of 1 November 2020, you will no longer meet your permit's requirements as a skilled employee.
One of the conditions for obtaining a permanent residence permit is that you have had a continuous residence in Norway for the past three years with permits that form the basis for a permanent residence permit. You must meet the requirements for your residence permit for the entire period. For example, if you are a skilled worker, you must have had a job and income as assumed throughout the period.
Even if you are laid off, which affects your basis for later applying for permanent residence, you can still stay in Norway according to what is stated above in this answer.