Speaking for the US here, but I believe the same is true in most places.
If I fail to pay my taxes and I sit at home completely non-violently, at some point, a man with a gun will come to my house and move me.
If I ignore liens, my home will be foreclosed, and eventually the sheriff will forcibly remove me from the property.
If I am subject to asset forfeiture and my cars, trucks, bulldozers, gold bars, or prized kittens are ever found, they will be forcibly taken from me.
This is all done through the use of force by men who wield guns.