Staying less than 3 months
If you are an EEA/EFTA citizen who intends to work in Iceland for less than 3 months you need to contact the Iceland Revenue and Customs regarding the application of a system ID number.
Only public authorities can apply for a system ID number for foreign citizens and applications must be submitted electronically. In order to submit the application the public authority must identify themselves.
More information can be found on the website of the Registers Iceland.
Please note that a copy of passport or legal travel ID must be included in the application and the ID must be valid at the time the application is submitted.
Note that a system ID number is only issued to individuals who intend to stay less than 3-6 months in Iceland or do not intend to stay in the country at all. This registration does not grant any rights in Iceland.