Anywhere you go the Federal government is due to take its fair share of income tax, but state tax can vary widely and will make a big difference on your overall tax at the end of the day. Some state income tax rates vary by your income bracket and circumstances, while others levy no income tax whatsoever. Those states are Alaska, Florida, Nevada, South Dakota, Texas, Washington and Wyoming. Let's take a look at the states that have the highest income tax across the board.