Before you start

Kennitala and registered legal domicile
Electronic ID for Skatturinn's services and Ísland.is
A pension fund, which your employer will enrol you in
For the expert deduction, an application to Rannís

Step-by-step

1
Check your personal tax credit is being applied
Every taxpayer receives a monthly personal tax credit (persónuafsláttur) that reduces the withholding. It must be allocated to an employer; if you have two jobs it can be split. Unused credit carries forward within the year. Newcomers sometimes have it unallocated for months and overpay.
OnlineWho: YouMonth 1
2
Apply for the foreign expert deduction through Rannís
Iceland exempts 25% of a qualifying foreign expert's income from tax for the first three years of employment. Applications go to Rannís, the Icelandic Centre for Research, and can be made by the employee or the employer. You must not have been resident or domiciled in Iceland in the 60 months before the employment started.
OnlineWho: You and your employerAt the start of employment
3
Understand the pension contributions
Pension membership is compulsory in Iceland, with an employee contribution and a substantially larger employer contribution, plus an optional additional private pension that most employers match. Taking the matched additional contribution is close to free money and is regularly declined by newcomers who do not understand the offer.
Via employerWho: You
4
Know what makes up the rate
National income tax is charged in bands, and the municipality adds a flat útsvar on top — Reykjavík's is at the higher end of the national range. The combined rate is what appears on your payslip. Capital income is taxed separately at a flat rate.
OnlineWho: You
5
File the annual return in spring
Skatturinn pre-populates the return with employer, bank and registry data. You check and amend it through the online service in spring. Most people confirm rather than compile.
OnlineWho: YouMarch
6
Declare foreign income and assets
Icelandic tax residents are taxed on worldwide income. Foreign accounts, property and investments must be declared, and Iceland participates in automatic information exchange. Add them rather than assuming they are already captured.
OnlineWho: You

Documents you’ll need

Kennitala
Electronic ID
Employment contract, for the Rannís application
Pension fund enrolment confirmation
Records of foreign income, property and accounts

Things most newcomers don’t know

The foreign expert deduction is worth a quarter of your income for three years and is applied for in an unexpected place.

Iceland exempts 25% of a qualifying foreign expert's salary from income tax for the first three years of employment — but the application goes to Rannís, the Icelandic Centre for Research, rather than to the tax authority, which is why so many eligible people never find it. The conditions are specific: no residence or domicile in Iceland in the preceding 60 months, expertise unavailable or scarce in Iceland, and work in research, development, innovation, teaching, specialised projects or a role essential to the company. Both employee and employer can apply, and it should be raised at contract stage.

Source: Rannís / Ísland.is

The personal tax credit must be allocated, and an unallocated one costs you every month.

Persónuafsláttur is a fixed monthly amount deducted from everyone's tax liability, and it has to be assigned to an employer to be applied against your withholding. A newcomer whose credit is unallocated, or split wrongly across two jobs, is over-withheld every month until it is corrected. It is fixed in minutes through Skatturinn's online service and it is one of the most common quiet overpayments among people in their first Icelandic year.

Source: Skatturinn

The optional additional pension contribution is usually matched, and declining it is leaving money behind.

Beyond the compulsory pension, Icelandic employees can make an additional private pension contribution which most employers match up to a set percentage. It is a straightforward increase in total compensation and it is tax-advantaged. Newcomers frequently decline it during onboarding because the paperwork is in Icelandic and the benefit is not explained. Ask specifically what the employer match is before you tick anything.

Source: community-reported

Indexation runs through Icelandic financial life in a way outsiders do not expect.

Verðtrygging — linking to the consumer price index — is embedded in many Icelandic mortgages, loans and long-term contracts, a legacy of decades of high inflation. An indexed mortgage's principal rises with inflation, which changes the arithmetic of borrowing here fundamentally compared with a fixed nominal loan elsewhere. Anyone thinking about buying property should understand indexed versus non-indexed loans before comparing headline interest rates, because the headline rate is not comparable.

Source: Central Bank of Iceland

Common mistakes to avoid

Not allocating your personal tax credit and being over-withheld every month.
Missing the foreign expert deduction because it is administered by Rannís rather than the tax authority.
Declining the matched additional pension contribution during onboarding.
Comparing an indexed Icelandic mortgage rate with a nominal foreign one as though they were the same thing.
Failing to declare foreign accounts and property, which Iceland already receives data about.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.