For many assets, like real estate, there are liquid markets with market prices. There are a number of US states that already tax based on real estate value, you can dispute the assessed value but that impacts other things like insured value.
Being difficult to assess value is a problem they’ll make you pay an accountant for and punish you if you get it wrong, it’s not going to stop them.
Being difficult to assess value is a problem they’ll make you pay an accountant for and punish you if you get it wrong, it’s not going to stop them.