Issues in relation to which referendums are optional at the national level
Austria
Answer
Any issue of national importance
Source
B-VG Art. 43, 44 (3), Art. 60 (6)
http://www.ris.bka.gv.at/GeltendeFassung.wxe?Abfrage=Bundesnormen&Gesetzesnummer=10000138
Comment
Generally,every law can be put to a vote by referendum if so decided by the NationalCouncil or the Federal President is impeached by means of a referendum beforehis/her term of office is expired.
