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This doesn't contradict the parent comment. The Federal Government isn't the single authority on taxes. The 16th amendment grants them the power to lay and collect, but it does not reserve that power exclusively to the Feds.

Congress has non-exclusive power to tax under Article I; the 16th Amendment shifted the parameters of that power but did not make it exclusive.

Yes, that is why everyone pays federal income tax. State income tax is an additional right given to state governments.

Or, in the American tradition, it is a right not forbidden to state governments.

Read the 10th amendment:

> The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people