Why is taxation theft?
In the words of Murray Rothbard, who wrote in The Ethics of Liberty:
All other persons and groups in society (except for acknowledged and sporadic criminals such as thieves and bank robbers) obtain their income voluntarily: either by selling goods and services to the consuming public, or by voluntary gift (e.g., membership in a club or association, bequest, or inheritance). Only the State obtains its revenue by coercion, by threatening dire penalties should the income not be forthcoming. That coercion is known as “taxation,” although in less regularized epochs it was often known as “tribute.”
Taxation is theft, purely and simply, even though it is theft on a grand and colossal scale which no acknowledged criminals could hope to match. It is a compulsory seizure of the property of the State’s inhabitants, or subjects.
It would be an instructive exercise for the skeptical reader to try to frame a definition of taxation which does not also include theft. Like the robber, the State demands money at the equivalent of gunpoint; if the taxpayer refuses to pay his assets are seized by force, and if he should resist such depredation, he will be arrested or shot if he should continue to resist.
