The amount you owe in state income tax is based on:

The amount you owe in state income tax is based on your income level. This practically means that the bigger your income level, the more you owe in state income tax, the smaller your income level, the less you owe in state income tax. The percent of state income tax differs from country to country, and it can be fixed, where everyone pays the same percentage of their income, no matter the amount of their income, or the percentage can proportionally grow with the bigger level of your income.