I really don't see how your argument holds that income tax is a regulation of speech. You're arguing that income tax is a regulation of speech just like regulat

I really don't see how your argument holds that income tax is a regulation of speech. You're arguing that income tax is a regulation of speech just like regulating the purchase of political advertising, so we either are allowed to have both or neither. It sounds like a really bad argument, or one that is too subtle for me to pick up the good points. And I'm guessing it's the first.