Iceland Tax Filing Guide 2026
All tax filing in Iceland is handled through Skatturinn (RSK), the Icelandic tax authority. The tax year is the calendar year, and most filing is done online.
Tax Authority
Skatturinn (RSK) — the Directorate of Internal Revenue. The online portal is skatturinn.is (also Island.is for individual services).
Individual Tax Return
- Tax year: Calendar year (1 January – 31 December)
- Filing deadline: March 31 of the following year
- Pre-filled return: RSK pre-populates returns with income data from employers, banks, and pension funds
- Amendments: Changes can be made until late October
Corporate Tax Return
- Filing deadline: May 31 of the following year
- Extensions may be granted in special circumstances
- Must include financial statements, tax computations, and supporting schedules
VAT Returns
- Frequency: Every 2 months (6 returns per year)
- Deadline: 15th of the second month after the period end
- Filed electronically through the RSK VAT portal
RSK Online Portal
Almost all tax filings are done electronically via Island.is (individuals) or skatturinn.is (businesses). Digital authentication is required via electronic ID (íslensk rafræn skilríki).
Penalties for Late Filing
- Individual returns: Late filing penalty of up to 10% of tax due
- Corporate returns: Penalty of 0.5% per month up to 10%
- VAT: 0.5% per day up to 10% plus interest
Tax Payments
IIT is collected through withholding (pay-as-you-earn) for employees. Self-employed individuals pay estimated tax in instalments. Any balance due is payable upon filing the annual return.