This is just one point of view of money and taxes, a mechanism to extract value from conquered population.
This probably still happens in 21 century, but I hope we can see beyond that, at least in 1st and 2nd world.
Money infrastructure for most people there is primarily a convenient bookkeeping mechanism for trade. In most cases, government should not directly involve itself with such trades.
Towards your question, if soldiers stopped taxation, their supervisors would rectify that eventually. If Rome stopped taxation of conquered populations, the coins would still retain value in Rome.
This probably still happens in 21 century, but I hope we can see beyond that, at least in 1st and 2nd world.
Money infrastructure for most people there is primarily a convenient bookkeeping mechanism for trade. In most cases, government should not directly involve itself with such trades.
Towards your question, if soldiers stopped taxation, their supervisors would rectify that eventually. If Rome stopped taxation of conquered populations, the coins would still retain value in Rome.