There can't be financial privacy as long as there is a need to pay taxes - and therefore to be able to tell if you're paying them (and in the correct amount).

There can't be financial privacy as long as there is a need to pay taxes - and therefore to be able to tell if you're paying them (and in the correct amount). There can't be a financial system if there are no taxes, because financial system is maintained by some form of government, which needs money to operate, and both are function of scaling up human societies. Therefore, financial system and financial privacy are mutually exclusive in practice.