@Oliversmumsarmy
Thomas Piketty published a very large book on this subject and won a prize for it. It is not serious to say that he did not do his research. Furthermore, I refuted your example easily on the basis that a person in negative equity, ie, probably insolvent, hasn't got any wealth and therefore wouldn't be assessed for any wealth tax. Your example confuses a wealth tax with a poll tax.
Then you say (regarding payment of tax when property is sold):
I can see a huge problem with this. If you are relying on people then to actually sell the house. All that will happen is people just wont sell.
I don't see that as a problem. A person could be assessed each year on the value of assets owned. The liability could sit there accruing a rate of interest until the house (or other asset) changes ownership through sale or succession.
I think governments around the world have seen what happened to France who went ahead with a wealth tax at a fraction of the 10% Polly Toynbee is advocating and seeing what happened there is a warning.
This argument, along with the "I earned it, so it's state theft" gets trotted out whenever any sort of tax is discussed.
What actually happened? A small number of very wealthy people left France, or pulled their wealth out of French property? Actually I suspect concerns about this are overstated. Of course wealthy people - like all of us - don't want to pay more tax than they have to, but they also like to live in nice surroundings - in well ordered countries with good standards of living - much like France really - and pay the tax, so I expect some actually ended up staying or returning. And if the very wealthy pulled out of French property, well that strikes me as very good news for the rest of the population of France as it makes property more affordable for them. This is in fact a classic example of how, when wealth inequality is high, society becomes structured for the benefit of the very rich and everyone else loses out.
If gambling winnings were taxed then wouldn’t everyone just take up gambling and claim their losses against tax
I believe most or many jurisdictions do tax gambling winnings in the form of some kind of duty and simply don't allow deductions.
I agree, by the way, that a one-off 10% wealth tax would be a daft idea. Polly Toynbee is flying a kite, trying to get people's attention. A rate more like 1% per annum is wha Piketty envisages.