Austrian Chamber of Accountants and Tax Advisors:
www.kwt.or.atAustrian Ministry of Finance:
https://www.bmf.gv.at/(Austrian) forms:
https://www.bmf.gv.at/service/formulare/_start.htmAustrian Federal Legal Informations System:
http://www.ris.bka.gv.at/Verification of foreign VAT numbers :
http://ec.europa.eu/taxation_customs/vies/Church Tax Calculator:
http://www.kirchenbeitrag.at/beitragsberechnung/0