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It's an aim, it isn't really what I have in mind. I want people with lots of wealth to contribute lots. Property tax is one of the more straightforward forms of wealth to tax because you can't move it, hide it etc.
There is still an incentive to downsize if you want your offspring to inherit with a smaller tax bill.
The other thing about an annual property tax is it could probably replace stamp duty which then makes buying and selling cheaper and perhaps more movement?
I'd let people defer it until they sell, although maybe with an interest charge