No enlightened individual today holds that slavery is morally acceptable or should be legally permitted.
By the same token, almost nobody today believes that the act of taxing is immoral, quite the opposite, it is widely regarded as a necessary and beneficial (hence, morally good) activity.
To say that taxation is the same as slavery is hyperbolic and, simply, not true. Nevertheless, there is a direct relationship between taxation and slavery.
For the sake of discussion, I will separate slavery into two components:
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Redistribution of 100% of the slave’s product to the slaveholder
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Compulsion of the slave to produce
It should be readily apparent how taxation and slavery are related. In the first component of slavery, taxation is only different from slavery in degree. That is, slavery is the limit case of taxation in terms of the redistribution of the product of the taxee/slave. In the second component of slavery, taxation differs from slavery in that participation in economic activity (the condition for taxation) is in every particular case voluntary*.
It should also be readily apparent that in neither aspect of slavery is taxation morally distinguishable from it. Stealing a penny from someone’s bank account is immoral because it’s not your penny and if you can take one penny, then you can take two (slippery slope). Stealing is taking any of someone’s property without their consent. Leaving some property behind doesn’t make it not stealing. Similarly, forcibly redistributing the product of a human being’s efforts through taxation is enslavement by degree. Leaving some of their productivity behind doesn’t make it not enslavement. Giving them a (grim) choice whether to participate in economic activity or not doesn’t make it not enslavement. Giving a portion of it to the poor or building things that benefit everybody doesn’t make it not enslavement.
The minarchists are completely wrong on this point. The minarchist view is that a certain, very small amount of forcible redistribution through taxation is necessary and beneficial. But, as I pointed out above, this leads to a slippery slope and the history of the United States government is dramatic empirical evidence of this point. Allowing the slaveholder to take just 50% or 10% or even just 0.1% of the slave’s product is not freeing the slave. It’s a concession of the whole principle of the matter. Slavery - even enslavement by degree with a form of “choice” and even where the slaveholder gives to charity and builds things that benefit all the slaves - is repugnant and immoral. Taxation is repugnant and immoral.
Clayton -
*In a wider sense, participation in economic activity is compelled by material need, that is, the need to eat, be clothed and sheltered and so on.