"Slavery is you get no money. And by the way, if you disagree with it, the power holder beats the tar out of you."

If you try to withhold payment of taxes, I suspect you will feel a the force of the law.

"There is no right to leave."

Can I stop paying tax without a negative effect?

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I am not free if I am forced to pay 100% of my income - that is slavery by your definition.

But if I pay 90%, am I free now? What about 40% - is that the 'freedom percentage'?

Please let me know what amount of income a free man should hand over under threat of force if they do not consent willingly.