Calculation of the taxable value of residential properties
The Norwegian Parliament, Stortinget, has adopted an updated model for calculating the taxable value of residential properties. The model uses information about sold residential properties from smaller geographic areas instead of entire municipalities and will apply from the 2026 income year.
The purpose of the change is to calculate a more accurate market value of residential properties.
We will not use the updated model in the 2025 tax return.
In your tax deduction card for 2026, the market value of your residential property is calculated using the updated model.
The Tax Administration calculates the market value
We calculate the market value of your residential property based on information from Statistics Norway (SSB) on the sale of residential properties. The calculation takes into account the property’s location, size, year of construction, and type of property.
In the tax return for 2025
We will not use the updated model in the 2025 tax return.
When calculating the taxable value in the tax return for the 2025 income year, we use the calculated market value of your residential property at the end of 2025.
You can calculate the taxable value and the calculated market value of your residential property yourself.
If the calculated market value and taxable value are too high, you can request that your residential property is valued based on proven market value. You can change the information in your tax return yourself, and you must attach valid supporting documents.
In the tax deduction card for 2026
In your tax deduction card for 2026, the market value of your residential property is calculated using the updated model. This is a calculation of what we believe your residential property will be worth at the end of the 2026 income year.
We start with the information about your residential property from your 2024 tax assessment. For the 2026 income year, it has been decided that we should use the updated model for calculating taxable value.
Your 2026 tax deduction card is based on what your property’s taxable value would have been in 2024 using the updated model.
We also take expected price growth in the property market into account. We estimate that property prices will increase by an average of 9.8 percent from the end of 2024 to the end of 2026.
If you believe the calculated market value and taxable value are too high, you can change them and order a new tax deduction card.
You must enter the market value you believe is correct. The taxable value is calculated automatically. Read more about the taxable value of residential properties.
Specific information if you
To address cases where the taxable value of residential property was too high due to municipal mergers, a transitional rule was introduced from the 2020 income year.
This transitional rule will be discontinued from the 2026 income year.
In the 2026 tax deduction card, properties are valued using the updated model.
You can read more about the updated model on Statistics Norway’s (SSB) website.