English-language Wikipedia does not have a great article on Belgian taxation complexity, but it has a great article on structural complexity that highlights the

English-language Wikipedia does not have a great article on Belgian taxation complexity, but it has a great article on structural complexity that highlights the weird "almost-entirely-overlaps" structure: https://en.wikipedia.org/wiki/Communities,_regions_and_language_areas_of_Belgium https://en.wikipedia.org/wiki/Communities,_regions_and_langu... Mind you that this does not even anything at city level. Imagine if Illinois was mostly part of the Midwest Region (a governmental entity that transcends states but is not federal and also has a tax authority), but not including Chicago. That'd be close. Also the largest party in its government wants the Midwest to secede from the Union.