This isn't funny. I'd argue that it is true, though. Taxation, as an idea, is simply the idea of taking something from someone 'for the common welfare' (ie, other people's well being).

Taking everything, including choice, (in essence slavery) could be called a 'tax' using the above definition.

To compare taxes (as they are presently levied against any first world population) to slavery is quite a stretch, though.