> Under Austrian law children (including adopted children) and the spouse are entitled to a "reserved portion". The children´s and the spouse´s "reserved portion" has to cover at least half of the portion they would get in the case of intestacy.

https://www.globalpropertyguide.com/Europe/Austria/Inheritan...

So I wasn’t right about the fixed part, it very much depends on whether there is a spouse to inherit it to.