Modern states have the ability to operate without tax money longer than you have the ability to stay out of jail. Besides, most people keep their money in a bank where a state can seize it without resistance. More currency can be printed as needed.
Also, if you simply seize the money from the bank accounts, it's gonna be worthless the next day, as no one will think it's worth using the currency that can evaporate at your master's will.
As they say, the markets can stay irrational much longer than you can stay solvent.