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; Skatturinn does not grant individuals extensions). 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 late filing: Up to 25% surcharge on the estimated additional tax when a return is not filed.
- Assessment timeline: The final assessment is generally completed by 31 May of the assessment year.
- Payment of the difference: Additional tax is spread over 7 instalments. Overpayments are refunded.
- Right to correct: You can file a corrected return to fix errors or omitted information.
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 Íslykill (a web key issued by Registers Iceland).
- 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 Look for omitted income, incorrect deductions or outdated information.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 (Skatturinn does not grant individuals extensions). Accountants/bookkeepers filing on a client's behalf have until 15 April 2026. If you discover an error after filing, file a corrected return as soon as possible.
What should you NOT do?
- Don't let the March deadline lapse — the 25% surcharge on the estimated tax is significant.
- Don't assume the pre-filled return is always correct — you are legally responsible for its accuracy.
- Don't throw away records — keep all supporting documents for at least 6 years.
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). Skatturinn does not grant individuals extensions. Accountants and bookkeepers filing on behalf of clients have until 15 April 2026. The final tax assessment is generally completed by 31 May of the assessment year. Additional tax is spread over 7 instalments, while overpayments are refunded.
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?
A surcharge of up to 25% on the estimated additional tax applies when a return is not filed on time. You can file a corrected return to fix errors or omitted information after filing. Keep all supporting documents for at least 6 years. File electronically through Skatturinn's service portal as soon as possible if you miss the March deadline.
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; Skatturinn does not grant individuals extensions). 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 late filing: Up to 25% surcharge on the estimated additional tax when a return is not filed.Assessment timeline: The final assessment is generally...
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 Íslykill (a web key issued by Registers Iceland).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 (Skatturinn does not grant...
What should you NOT do — filing a tax return?
Don't let the March deadline lapse — the 25% surcharge on the estimated tax is significant.Don't assume the pre-filled return is always correct — you are legally responsible for its accuracy.Don't throw away records — keep all supporting documents for at least 6 years.