In most states the largest single source of revenue comes from?

Answer 1

Due to the very different nature of U.S. states, there is no good answer to this question. The top three sources of income for US States are: sales tax, personal/corporate income tax, and passdown from the Federal government. Given that not all states have both income and sales taxes (some have only one or the other), and that the amount of Federal passdown can vary widely (both between different states, and from year to year), there is no good generalization to be made about the single biggest source of income for a majority of the states.

Note, if you want to be strict about the word "revenue" (as in, a source of income that the state directly collects), that would exclude Federal passdown. 41 states impose an income tax (plus 2 which tax only investment/interest income), while 45 impose a sales tax. Two states (Alaska and New Hampshire) have no general sales or income taxes. The latter two states tend to rely on property/business income tax (in NH) and oil production taxes (AK) for the majority of their revenue.