A tax on an individual's labor/wages is a slave tax. In the 1850's slaves did not own any of their labor. It was owned  by their master. How much of our labor can be confiscated by government and still be considered free?

There are two states that have an income tax paid outside an individual's wages/labor. Tennessee  and New Hampshire.

Taxes are paid on investment income. 

http://www.bankrate.com/finance/taxes/state-taxes-new-hampshire.aspx

http://www.bankrate.com/finance/taxes/state-taxes-tennessee.aspx