This article is quite odd: income appears to be taxed "more progressively"...One justification for this is that investors risk losing much or all of their capital. Workers, on the other hand, are guaranteed their wages This is not the primary justification at all, and I'd be rather surprised to see many economists arguing it. The actual reason capital should be taxed less than income (specifically, at 0%) is because…
Exactly. The way I see it, if someone has a large pool of wealth, then they have already been taxed when they earned it. Taxing capital gains is double-dipping. Furthermore, I don't see how we can justify having a very low interest rate set by the federal reserve in the interest of encouraging investment, but then decide to tax capital gains more which would discourage investment. However, trying to make any sense of…
If you make $500, then pay $100 in income tax, you're left with $400.
If you invest the $400 in a stock and sell later for $500, you're not taxed on the $400 you've already made (and were taxed on), you're taxed on the $100 capital gain, which you haven't paid taxes on.
Or am I misunderstanding things?
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Further ... Is your argument is that once a pool of money has been taxed, that pool of money should never be taxed again? If so, does that mean you don't believe anyone should pay sales tax on anything they've purchased (since they're purchasing it with post-income tax dollars)?
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Lastly, you mention that if "someone has a large pool of wealth, then they have already been taxed when they earned it". This is not necessarily so thanks to dynastic wealth, an issue others have brought up in other comments.
The issue is exacerbated when someone inherits wealth (and pays little to no taxes on it), then invests it and has a capital gain of say $40k -- enough to cover basic living expenses in many parts of the country for a year. That person's tax rate is lower than a person who worked for an employer and made $40k. The question is, why is the government incentivizing this through tax code?