Most of the data for he Business Register are obtained from administrative files. The administrative data used by the Business Register are gathered from the administrative files of the Tax Administration and other public authorities, such as the Board of Patents and Registration, Board of Customs, State Treasury, Bank of Finland and the Local Government Pensions Institution.
The units for the Register of Enterprises and Establishments are primarily gathered from the Tax Administration's customer database (parties liable to pay value added tax on their business activity, employers, parties entered into the preliminary tax withholding register). Units of central government agencies are obtained from the State Treasury's agency register. Operating units of local government are obtained from the Local Government Pensions Institution's register.