Almost forgot.
As you may or may not know somebody leeched around 1.8 billion USD from the Danish tax authorities a few years back. If you as a foreigner earns money on stocks in a particular way you're entitled to have your taxes on said particular earnings refunded; somebody then decided to claim earnings he never had made and hence milk the system big time. The scam also involved several banks and some large British banks are trying to cover their arses at the moment and hence have frozen the part of the scammed money which hadn't yet been transfered to Dubai. Though they might well still be criminally responsible. Several American retirement funds also participated in the scam and they too have been scrambling to cover their arses (their biggest problem is that there's no doubt they used the scam so they pretty much need to find some kind of fall guy). They might end up having to repay very large sums due to the large scale tax evasion they have committed. The main suspect is a man called Sanjay Shah who lives in Dubai.
Anyway safeguards have been implemented and one of them have been rolled out this year for the annual tax returns. The tax man does your tax returns; if you then think there's an error you can correct it. The system now automatically blocks corrections which are suspicious. For instance if you claim to live in a listed house (and hence shouldn't pay any property or land taxes), but the databases show that you live in an unlisted house.
Or if you try to get a tax deduction for driving to work, but the databases have you listed as unemployed.
The reason listed houses have no land or property taxes is that you can't really do anything to them unless you have explicit consent from cultural heritage department. Say you think that the two very tiny rooms in your house aren't really usable for anything and you hence remove the wall between them to get a usable small room. Well if the cultural heritage department didn't approve beforehand then they will force you to undo the change. And you will need to use period accurate materials and methods---and that's expensive as heck. If the wall was made of straw, manure, and planks well then the new one will have to be made of it too. And if the wall was some really elaborate masonry wall by a master mason well then you will need to find a mason capable of replicating the work of this master mason and you'll have to pay him whatever he charges to get it rebuilt. And he of course is not allowed to use any powertools, since those did not exist 200 years ago. He'll need to do it ye olde way with backbreaking hand tools. (So as a piece of advice do not piss off the cultural heritage department by changing things without permission; had you applied for permission you might have been allowed to remove/move the wall, but doing the work and then hoping that fait acompli will get you off the hook will only make them mad at you.)
A few years ago a large mansion burned in Copenhagen; rebuilding cost is at least 30 million USD because it was listed; the cultural heritage department simply pulled forth the 250 years old blueprints and handed them over to the insurance company telling them that it should be rebuilt exactly as it was with period accurate materials and methods. For instance the roof was constructed by Pomeranian spruce, which is quite rare these days, but the cultural heritage department stated that even if they'd have to plant a plantation and wait for it to grow large enough then that was what they'd have to do.
It's good to know that our cultural heritage is in good hands who won't let anything happen to it.