Filing a Tax Return in Iceland (2026 Legal Guide) — Rules & Requirements
About this article
Sourced from Icelandic Acts of the Althingi, statutory instruments, and official guidance. Written in plain language for general understanding — this is educational content, not legal advice. Our editorial standards
What is this right?
All taxpayers in Iceland must file an annual tax return:
- Filing deadline: 13 March 2026 for the 2025 income year (individuals filing electronically on skattur.is). There is no general extension for individuals; if you cannot file in time for reasons outside your control, such as illness or being abroad, you should file as soon as you can and explain the delay in a comment on the return. Accountants/bookkeepers filing on a client's behalf have until 15 April 2026.
- Pre-filled return: Skatturinn offers a pre-filled return with information on wages, real estate, vehicles, bank accounts and debts. You confirm or correct it.
- Penalty for not filing: If no return arrives by the deadline, Skatturinn estimates your income and assets deliberately on the high side and may add a surcharge of up to 15% to the estimated tax base. If the return arrives late but before the assessment is finished, the surcharge is 0.5% per day late, capped at 10%. The higher 25% surcharge applies to a return that is defective or understates individual items, and drops to a maximum of 15% if you put it right before the assessment is made.
- Surcharge can be cancelled: The surcharge must be waived if you show that the defect or the late filing was not your fault, or that circumstances beyond your control stopped you filing on time.
- Assessment timeline: For the 2025 income year the result of the assessment is due no later than 29 May 2026. In law the assessment must be finished within ten months of the end of the income year, with the exact date set annually.
- Payment of the difference: Remaining assessed tax is spread evenly over seven due dates, 1 June to 1 December. You can instead ask, when you file, to settle the whole assessment on 1 June. Overpayments are paid out on 1 June.
- Right to correct: You can appeal the assessment to Skatturinn within 3 months of the announcement that the assessment is complete. After that, Skatturinn may still change an assessment on request going back at most six income years, where the request rests on new information and substantial interests are at stake.
When does it apply?
- You have legal domicile in Iceland and received taxable income in the past year.
- Even if the return is pre-filled, you are responsible for its accuracy.
What to do if you missed the tax-return deadline or made an error on your return in Iceland
- Log in to skattur.is with electronic ID (electronic ID in your phone or on an e-ID card) or with a veflykill — a web key issued by Skatturinn, which can be sent to your online bank or by post to your legal domicile. Skatturinn recommends electronic ID as the more secure option.
- Review the pre-filled return carefully — check the wage information, real estate, vehicles, bank accounts and debts that Skatturinn has imported. Look for omitted income, incorrect deductions or outdated information.
- Add deductions and corrections — interest expenses on housing, mortgages, gifts, professional-association fees, foreign income and items not filled in automatically.
- File by 13 March 2026 for the 2025 income year. There is no general extension for individuals; if illness or being abroad stops you filing on time, file as soon as you can and explain the delay in a comment on the return. Accountants/bookkeepers filing on a client's behalf have until 15 April 2026. If you discover an error after filing, put it right as soon as possible — by appeal within 3 months of the assessment, or afterwards by asking Skatturinn to change the assessment.
What should you NOT do?
- Don't let the March deadline lapse — if nothing arrives, Skatturinn estimates your income and assets deliberately on the high side and can add up to 15% on top of that estimate.
- Don't assume the pre-filled return is always correct — you are legally responsible for its accuracy, and understating an item carries a surcharge of up to 25%.
- Don't throw away records — keep all supporting documents for at least 6 years, which is how far back both a reassessment by Skatturinn and a correction in your favour can reach.
About Tax Rights in Iceland
Income tax in Iceland is progressive in three brackets under lög um tekjuskatt (the Income Tax Act, Lög nr. 90/2003) and combines state tax and municipal tax (~14.94%). All residents aged 16 and over receive a personal tax credit (persónuafsláttur) that is transferable between spouses. Capital income is taxed at 22%. VAT (Lög nr. 50/1988) is 24% standard and 11% reduced — businesses register once turnover exceeds 2 million kr. Skatturinn (the tax authority) handles the assessment. You can appeal to yfirskattanefnd (the State Tax Board of Appeals) and from there to the district courts. Employers pay a social security contribution (tryggingagjald) under Lög nr. 113/1990.
Common Questions
When is the Icelandic tax-return deadline?
13 March 2026 for the 2025 income year (individuals filing electronically on skattur.is). There is no general extension for individuals, but if reasons outside your control stop you filing on time you should file as soon as you can and explain the delay on the return. Accountants and bookkeepers filing on behalf of clients have until 15 April 2026. The result of the assessment is due no later than 29 May 2026. Remaining assessed tax is spread over seven due dates from 1 June to 1 December, while overpayments are paid out on 1 June.
Do I have to fill in the Icelandic tax return from scratch?
No. Skatturinn offers a pre-filled return with information on wages, real estate, vehicles, bank accounts and debts. You confirm or correct it through Skatturinn's service portal (RSK). Although it is pre-filled, you are legally responsible for its accuracy — review it carefully for missing income, incorrect deductions or outdated information.
What is the penalty for filing a tax return late in Iceland?
If no return is filed by the deadline, Skatturinn estimates your income and assets on the high side and may add a surcharge of up to 15% to that estimate. A return that arrives late but before the assessment is finished carries 0.5% per day late, capped at 10%. The 25% surcharge is for a defective return or understated items, and drops to a maximum of 15% if you correct it before the assessment. The surcharge must be waived if you show the delay or defect was not your fault. File through Skatturinn's service portal as soon as possible if you miss the March deadline, and keep supporting documents for at least 6 years.
What is the filing a tax return right in Iceland?
All taxpayers in Iceland must file an annual tax return:Filing deadline: 13 March 2026 for the 2025 income year (individuals filing electronically on skattur.is). There is no general extension for individuals; if you cannot file in time for reasons outside your control, such as illness or being abroad, you should file as soon as you can and explain the delay in a comment on the return. Accountants/bookkeepers filing on a client's behalf have until 15 April 2026.Pre-filled return: Skatturinn offers a pre-filled return with information on wages, real estate, vehicles, bank accounts and debts....
When does it apply — filing a tax return?
You have legal domicile in Iceland and received taxable income in the past year.Even if the return is pre-filled, you are responsible for its accuracy.
What should I do if I missed the Icelandic tax-return deadline or need to correct an error on my return?
Log in to skattur.is with electronic ID (electronic ID in your phone or on an e-ID card) or with a veflykill — a web key issued by Skatturinn, which can be sent to your online bank or by post to your legal domicile. Skatturinn recommends electronic ID as the more secure option.Review the pre-filled return carefully — check the wage information, real estate, vehicles, bank accounts and debts that Skatturinn has imported. Look for omitted income, incorrect deductions or outdated information.Add deductions and corrections — interest expenses on housing, mortgages, gifts, professional-association...
What should you NOT do — filing a tax return?
Don't let the March deadline lapse — if nothing arrives, Skatturinn estimates your income and assets deliberately on the high side and can add up to 15% on top of that estimate.Don't assume the pre-filled return is always correct — you are legally responsible for its accuracy, and understating an item carries a surcharge of up to 25%.Don't throw away records — keep all supporting documents for at least 6 years, which is how far back both a reassessment by Skatturinn and a correction in your favour can reach.