Norway Tax Filing Guide (Skattemeldingen, Altinn, Skatteetaten, April 30 Deadline)
Norway's tax filing system is fully digital. The skattemeldingen (tax return) is pre-filled with income data from employers, banks, and other institutions. Most taxpayers only need to review and confirm via Altinn before the 30 April deadline.
Norway's tax filing system is administered by Skatteetaten (the Norwegian Tax Administration) and is built around the digital skattemeldingen (tax return), which is largely pre-filled. Most communication with Skatteetaten occurs through the Altinn portal (altinn.no). All amounts are in Norwegian kroner (NOK).
Skattemeldingen — The Pre-Filled Tax Return
The skattemeldingen is Norway's annual tax return. It is a fully digital document that is automatically pre-filled with information from third parties: (a) employers report salary and withholding tax through the a-melding system, (b) banks and financial institutions report interest income, dividends, and account balances, (c) NAV reports social security benefits and pension income, (d) pension providers report pension contributions and payouts, and (e) the Norwegian Mapping Authority (Kartverket) reports property values for wealth and property tax purposes. For most employed taxpayers, the skattemeldingen is available in mid-March each year and is already 95% complete. Your main task is to review the pre-filled information, add any missing items (such as foreign income, crypto transactions, rental income, or additional deductions), and confirm the return. If you do nothing by the deadline, the return is automatically considered accepted for most taxpayers. However, if you have income that is not pre-filled (such as foreign income, crypto gains, or rental income) and you fail to report it, you may face penalties. The skattemeldingen covers the previous calendar year (2025 for the 2026 filing season).
Altinn — The Digital Portal
Altinn (altinn.no) is Norway's central digital portal for all communication with public authorities, including Skatteetaten. Through Altinn, you can: (a) access your skattemeldingen and pre-filled data, (b) make changes and add missing information, (c) view your tax calculation (skatteberegning), (d) apply for extensions or amendments, (e) file business tax returns (næringsoppgave), (f) submit VAT returns (omsetningsoppgave), (g) access your tax card (skattekort), and (h) communicate with Skatteetaten about audits or inquiries. To log into Altinn, you need a digital ID — either BankID (issued by Norwegian banks), Buypass, or Commfides. For foreign nationals without a Norwegian BankID, the Altinn portal supports login via ID-porten with a D-number or fødselsnummer. The Altinn mobile app is available for iOS and Android and provides push notifications for important deadlines and messages from Skatteetaten. All official correspondence from Skatteetaten is sent through Altinn's digital mailbox — there is no paper communication by default. You should check your Altinn inbox regularly, especially during the filing season (March–May).
April 30 Deadline
The annual deadline for filing the skattemeldingen is 30 April. This applies to all individual taxpayers. If you owe additional tax (restskatt), the payment deadline is also 30 April. If you are due a refund (overskuddende skatt), Skatteetaten typically processes and pays refunds in June–July. If you miss the 30 April deadline, a late filing penalty of NOK 2,500 is automatically imposed for the first two weeks of delay, increasing to NOK 5,000 after four weeks, and up to NOK 10,000 for prolonged delays. If you are unable to file by 30 April, you can apply for an extension through Altinn — the maximum extension is typically 30 days, granted automatically upon request. Taxpayers who use a registered tax advisor (regnskapsfører or revisor) may receive an automatic extension to 31 May or 30 June depending on the type of return. Self-employed individuals filing business returns may have extended deadlines. Interest on late payment of tax (restskattrente) accrues from 30 April at the rate set by the Ministry of Finance (approximately 2.5% per annum for 2026). Conversely, Skatteetaten pays interest on refunds (overskuddende rente) at a slightly lower rate.
How to File Step by Step
Filing your Norwegian tax return is straightforward for most taxpayers: (1) Log in to Altinn (altinn.no) using your BankID, Buypass, or Commfides, (2) Navigate to the skattemeldingen section — it will be prominently displayed during filing season, (3) Review the pre-filled information — check salary, tax withheld, bank interest, property values, and any other items carefully, (4) Add missing information using the guided form — you can add foreign income, crypto gains and losses, rental income, additional deductions (travel, union fees, etc.), and foreign assets for wealth tax, (5) Review the automatic tax calculation (skatteberegning) to see whether you owe tax or will receive a refund, (6) Submit the return — you will receive a confirmation receipt, (7) Pay any tax due by 30 April — payment can be made via online banking using the KID number provided in the skattemeldingen, (8) Monitor your Altinn mailbox for updates — if Skatteetaten makes changes to your assessment, you will be notified through Altinn. If you need to amend a previously filed return, you can submit corrections through Altinn within three years of the assessment year.
Common Deductions
Several deductions are available to reduce your taxable income on the skattemeldingen: (a) minstefradrag — automatic standard deduction of 46% of employment income up to 109,950 NOK, (b) reisefradrag — travel deduction for commuting more than 3.5 km each way (the first 18,000 NOK of travel costs are not deductible; above that, costs are deductible at approximately 1.50 NOK per km), (c) fagforeningskontingent — union fees up to approximately 6,000 NOK, (d) foreldrefradrag — childcare deduction for parents with children under 12, (e) rentefradrag — deduction for interest on mortgage, car loans, and other personal debt at the 22% rate, (f) pensjonssparing — IPS contributions up to 15,000 NOK deductible, and (g) gaver til frivillige organisasjoner — charitable donations up to 50,000 NOK deductible if given to approved organisations. Most deductions are pre-filled where third-party reporting exists. You should add missing deductions manually in the relevant sections of the skattemeldingen. For business owners and self-employed individuals, additional deductions for business expenses (næringsfradrag) are available through the næringsspesifikasjon.
Skatteetaten — Contact and Support
Skatteetaten provides extensive support for taxpayers. You can contact them through: (a) Altinn's integrated chat and messaging system, (b) the Skatteetaten contact centre by phone (+47 800 80 000), (c) local Skatteetaten offices in major cities (by appointment), and (d) the Skatteetaten website (skatteetaten.no) which has extensive guidance in Norwegian and English. The website includes a full version of the Tax Law (Skatteloven) and detailed instructions for each field on the skattemeldingen. For complex tax matters, Skatteetaten offers binding advance rulings (bindende forhåndsuttalelser) on specific transactions. Taxpayers who disagree with their assessment can appeal within six weeks of receiving the assessment notice. The appeals process involves first contacting Skatteetaten for a review, then appealing to the Tax Appeals Board (Skatteklagenemnda), and finally to the courts. Professional tax advisors (autoriserte regnskapsførere and statsautoriserte revisorer) are widely available in Norwegian cities and can assist with filing, planning, and appeals. Read our Norway Tax Residency Guide →