There is no customs duty on furniture, but you must pay VAT. The goods must be declared for release for free circulation on the border if the value of your goods exceeds the value limit.
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If you buy goods with a total value of under the value limit, you are not liable to pay value added tax or other taxes. The value limits are NOK 3,000 or 6,000, depending on how long you have been outside of Norway, and they apply when you travel.
If you are carrying goods above the allowance that you may bring in free of charge, you must pay VAT. The rate is 25 per cent, and the calculation basis is the customs value with the addition of other taxes. In most cases, this will represent the purchase price and shipping costs.