Some States have a reciprocity agreement, in that a tax paid in one State will be used as a credit against another State's income tax. Some States will tax everything you make at the Federal level, no matter where it is sourced. Some States will tax anything earned only from that State, no matter where the taxpayer lives. Sometimes royalties are taxable across multiple States, and typically must reach some reportable minimum. And when you see a State breakdown, do not expect those to add to 100%, since that isn't how this works.