Comment: Not necessarily.

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Not necessarily.

Uniform can still allow for variations, as long as those variations apply everywhere.

So people who have X amount of income can pay one rate, and people who have Y income can pay another, as long as everyone who falls under X pays the same rate, and everyone who falls under Y pays the same rate, even if the two rates are different, the tax is uniform.

You're looking at it as a single tax, when in effect, it really is multiple taxes written together. Each bracket, at a separate rate, is a separate tax. And in some states, it really is implemented this way. You pay Z rate on the first X amount, then W rate on the next Y amount, etc. EVERYONE pays Z rate on the first X. But people who have more and reach Y, ALSO pay the W rate on just that portion OVER X.

Some people try to explain the federal taxes thus, but they don't work out that way - they are blanket once you hit a bracket, not incremental.