Yes, it is also my understanding that any "rebate" paid by a third-party (not by the manufacturer as a price reduction in the original purchase price) like a state agency is taxable income, at least for federal purposes. In Texas, the payor (TCEQ) calls it both a "rebate" and a "purchase or lease incentive" and issues a federal Form 1099 to recipients. However, the fact there is no state income tax in Texas does mitigate this whole thing a little. Other states with a state income tax may or may not tax similar payments made in their state. You'll need to check it out with a local tax professional, which is still probably a good idea anywhere you may live.