Some useful links:
www.vero.fi – Tax Administration
www.veronmaksajat.fi – Taxpayers Association of Finland
www.ytj.fi – Finnish Business Information System
www.yrittajat.fi – Federation of Finnish Entreprises
www.prh.fi – Finnish Patent and Registration Office
www.kaupparekisteri.fi – Trade Register
www.kela.fi – The Social Insurance Institution of Finland
www.suomi.fi – Suomi.fi
www.vero.fi/en/incomes-register – Incomes Register