How to compare the cost of renting and buying an apartment in Norway?

Start with similar apartments. Financial service Smarte Penger recommends comparing the cost of buying with the rent for a comparable apartment. The point is for both options to involve similar living conditions. With a mortgage, distinguish between interest and principal repayment. Interest is the cost of borrowed money. Principal repayment reduces your debt. However, you must include the full instalment in your monthly budget. Savings intended for the down payment also matter. If they had previously earned interest in an account, you will stop receiving that interest after spending them on the apartment. This is income you give up when buying. Also check two terms that appear in Norwegian listings:

• Felleskostnader are monthly shared charges. They cover ongoing expenses and sometimes also repayment of a shared loan.
• Fellesgjeld is the debt of the housing cooperative or homeowners' association, a portion of which is allocated to a given apartment.

OBOS advises checking whether the shared loan has a period during which no principal is repaid. Once it ends, repayment of the borrowed amount is added to the interest. This can increase the monthly burden. The rules are explained by OBOS. Also take tax into account. Accrued interest on the loan for which you are responsible may be deductible. This concerns interest that you are already obliged to pay. Details are described by Skatteetaten. At the standard tax rate in 2026, the deduction provides a benefit equal to 22 percent of the interest. In the designated Troms and Finnmark zone, the rate is 18.5 percent. This reduces tax, not the interest charged by the bank. The rates are provided by Skatteetaten. Example: assume you are considering buying an apartment on the following terms:

• The apartment costs NOK 4,000,000.
• You have a NOK 2,000,000 down payment and take out a NOK 2,000,000 mortgage.
• The mortgage interest rate is 4.79 percent annually.
• Your savings could earn 3 percent interest annually.
• Shared charges are NOK 2,000 per month and cover only ongoing expenses.
• Renting a similar apartment costs NOK 14,000 per month.

We assume that you are entitled to an interest deduction at a rate of 22 percent. We use the same rate for tax on interest from savings. For simplicity, the mortgage balance and interest rate remain unchanged for one year. In this simplified calculation, you compare NOK 12,127 with rent of NOK 14,000. We have not yet included the costs of buying, selling or changes in the apartment's value. The amount of NOK 12,127 is not the total of monthly transfers. It includes forgone interest on savings, but does not include mortgage principal repayment. Therefore, separately check whether you have enough money for the full instalment and the charges.

Buying and later selling an apartment also costs money. Smarte Penger recommends including:

• any document duty, known as dokumentavgift;
• the real estate agent's fee, if you use their services when selling;
• advertising costs for the apartment being sold.

These expenses matter more if you plan to live in a given place for a short time. Example: assume that the total cost of buying and later selling is NOK 60,000. If you spread it over 2 years, NOK 2,500 per month is added to the comparison. Over 5 years, it will be NOK 1,000 per month. These are not monthly bills. However, this calculation helps show how much buying and selling cost over the entire period of living there.

You can use the Smarte Penger buy-or-rent calculator. It compares both options over periods from one to 10 years. It converts future amounts into today's monetary value. Enter your own mortgage offer, the rent for a comparable apartment, charges, and buying and selling costs. Also include the planned length of stay. A negative result for the additional value of buying means that, under the assumptions provided, renting is the more favourable option. A positive result supports buying. Calculate several scenarios, especially if you do not know how long you will stay in a given place. Also check how the result changes with a different interest rate or a different later selling price.

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