REGOS collects the data from the following sources:
R-S Form is used for collection of data on calculated compulsory contributions, income tax and the surtax to the income tax for insured persons.
REGOS matches data on calculated contributions for the second pillar of the pension insurance, collected by R-S Form, with the payments made by insured persons, and forwards them to the compulsory pension funds.
From the above mentioned sources, REGOS collected and processed the data for 2003 and 2004. They are presented and further elaborated upon in the following text.