I don't know, the whole refusing to release taxes things seems completely absurd to me, but then I'm Swedish.
Back in the 18th century a power struggle between the king and parliament resulted in parliament passing legislation in 1766 that all documents issued by or received by government authorities are to be considered public documents, unless they fit very narrow criteria (such as national security) for becoming classified. This caused quite some stir when Sweden joined the EU and a lot of other European governments were shocked to find out that letters they sent to the Swedish government were readily available to all Swedish journalists.
Anyway, tax fillings are no different. You send them to the Swedish tax authorities, which is a government Agency, and thus they become public. Anyone can find out what anyone has filed, if you are willing to take the time and don't mind your neighbours finding out that you have asked about them, because that is of course the one provision; you asking to get to see the documents is of course also a request that will become public.
https://www.businessinsider.com/sweden- ... ?r=US&IR=T
Anyway, that someone in a government position can refuse to tell what they filed is just completely foreign to me.
How can anyone accept a government with such a profound lack of transparancy?
All leading politicians in Sweden have journalists digging through their financial records on a regular basis, and there are a few scandals every year. Helps keep them honest.