Researchers working on a grant are usually not covered by the Finnish social security system since their stay in Finland is considered temporary. However, if the research work continues for more than a year, you have financing for more than a year and all other circumstances also indicate permanent residence in Finland, you may, as a rule, be covered by the Finnish social security system on the basis of permanent residence.
The definition of permanent residency in Finland, however, varies depending on your country of origin. If you are moving to Finland from outside the EU or Nordic countries, the qualification for permanent residency and municipality is 2 years of residency in Finland. If your research grant is for two years or more, you will normally be covered by the Finnish social security system and will qualify for Kela (The Social Insurance Institution of Finland) benefits as soon as you move to Finland.
Researchers from the EU/EEA countries who carryout research work or pursue postgraduate studies in Finland financed through a Finnish grant which entails the obligation to take out an insurance under the Farmers' Pensions Act (MELA) for at least four months, you are covered by the Finnish social security system for the duration of your research work or postgraduate studies. Coverage under the Finnish social security system has to be applied for with Kela.
For more precise information, please see:
KELA: Social security coverage for employees and self-employed persons
MELA: Grant and scholarship recipients
MELA: Grant and scholarship recipients